source: trunk/kernel/mm/vmm.c @ 640

Last change on this file since 640 was 640, checked in by alain, 3 years ago

Remove all RPCs in page-fault handling.

File size: 89.7 KB
Line 
1/*
2 * vmm.c - virtual memory manager related operations definition.
3 *
4 * Authors   Ghassan Almaless (2008,2009,2010,2011, 2012)
5 *           Mohamed Lamine Karaoui (2015)
6 *           Alain Greiner (2016,2017,2018,2019)
7 *
8 * Copyright (c) UPMC Sorbonne Universites
9 *
10 * This file is part of ALMOS-MKH.
11 *
12 * ALMOS-MKH is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; version 2.0 of the License.
15 *
16 * ALMOS-MKH is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
19 * General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
23 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24 */
25
26#include <kernel_config.h>
27#include <hal_kernel_types.h>
28#include <hal_special.h>
29#include <hal_gpt.h>
30#include <hal_vmm.h>
31#include <hal_macros.h>
32#include <printk.h>
33#include <memcpy.h>
34#include <remote_queuelock.h>
35#include <list.h>
36#include <xlist.h>
37#include <bits.h>
38#include <process.h>
39#include <thread.h>
40#include <vseg.h>
41#include <cluster.h>
42#include <scheduler.h>
43#include <vfs.h>
44#include <mapper.h>
45#include <page.h>
46#include <kmem.h>
47#include <vmm.h>
48#include <hal_exception.h>
49
50////////////////////////////////////////////////////////////////////////////////////////////
51//   Extern global variables
52////////////////////////////////////////////////////////////////////////////////////////////
53
54extern  process_t  process_zero;      // allocated in cluster.c
55
56////////////////////////////////////////////////////////////////////////////////////////////
57// This static function is called by the vmm_create_vseg() function, and implements
58// the VMM STACK specific allocator.
59////////////////////////////////////////////////////////////////////////////////////////////
60// @ vmm      : [in]  pointer on VMM.
61// @ ltid     : [in]  requested slot == local user thread identifier.
62// @ vpn_base : [out] first allocated page
63// @ vpn_size : [out] number of allocated pages
64////////////////////////////////////////////////////////////////////////////////////////////
65static void vmm_stack_alloc( vmm_t  * vmm,
66                             ltid_t   ltid,
67                             vpn_t  * vpn_base,
68                             vpn_t  * vpn_size )
69{
70
71// check ltid argument
72assert( (ltid <= ((CONFIG_VMM_VSPACE_SIZE - CONFIG_VMM_STACK_BASE) / CONFIG_VMM_STACK_SIZE)),
73"slot index %d too large for an user stack vseg", ltid );
74
75    // get stack allocator pointer
76    stack_mgr_t * mgr = &vmm->stack_mgr;
77
78    // get lock on stack allocator
79    busylock_acquire( &mgr->lock );
80
81// check requested slot is available
82assert( (bitmap_state( &mgr->bitmap , ltid ) == false),
83"slot index %d already allocated", ltid );
84
85    // update bitmap
86    bitmap_set( &mgr->bitmap , ltid );
87
88    // release lock on stack allocator
89    busylock_release( &mgr->lock );
90
91    // returns vpn_base, vpn_size (first page non allocated)
92    *vpn_base = mgr->vpn_base + ltid * CONFIG_VMM_STACK_SIZE + 1;
93    *vpn_size = CONFIG_VMM_STACK_SIZE - 1;
94
95} // end vmm_stack_alloc()
96
97////////////////////////////////////////////////////////////////////////////////////////////
98// This static function is called by the vmm_remove_vseg() function, and implements
99// the VMM STACK specific desallocator.
100////////////////////////////////////////////////////////////////////////////////////////////
101// @ vmm      : [in] pointer on VMM.
102// @ vseg     : [in] pointer on released vseg.
103////////////////////////////////////////////////////////////////////////////////////////////
104static void vmm_stack_free( vmm_t  * vmm,
105                            vseg_t * vseg )
106{
107    // get stack allocator pointer
108    stack_mgr_t * mgr = &vmm->stack_mgr;
109
110    // compute slot index
111    uint32_t index = (vseg->vpn_base - 1 - mgr->vpn_base) / CONFIG_VMM_STACK_SIZE;
112
113// check index
114assert( (index <= ((CONFIG_VMM_VSPACE_SIZE - CONFIG_VMM_STACK_BASE) / CONFIG_VMM_STACK_SIZE)),
115"slot index %d too large for an user stack vseg", index );
116
117// check released slot is allocated
118assert( (bitmap_state( &mgr->bitmap , index ) == true),
119"released slot index %d non allocated", index );
120
121    // get lock on stack allocator
122    busylock_acquire( &mgr->lock );
123
124    // update stacks_bitmap
125    bitmap_clear( &mgr->bitmap , index );
126
127    // release lock on stack allocator
128    busylock_release( &mgr->lock );
129
130}  // end vmm_stack_free()
131
132////////////////////////////////////////////////////////////////////////////////////////////
133// This static function is called by the vmm_create_vseg() function, and implements
134// the VMM MMAP specific allocator.
135////////////////////////////////////////////////////////////////////////////////////////////
136// @ vmm      : [in] pointer on VMM.
137// @ npages   : [in] requested number of pages.
138// @ vpn_base : [out] first allocated page.
139// @ vpn_size : [out] actual number of allocated pages.
140////////////////////////////////////////////////////////////////////////////////////////////
141static error_t vmm_mmap_alloc( vmm_t * vmm,
142                               vpn_t   npages,
143                               vpn_t * vpn_base,
144                               vpn_t * vpn_size )
145{
146    uint32_t   order;
147    xptr_t     vseg_xp;
148    vseg_t   * vseg;
149    vpn_t      base;
150    vpn_t      size;
151    vpn_t      free;
152
153#if DEBUG_VMM_MMAP_ALLOC
154thread_t * this = CURRENT_THREAD;
155uint32_t cycle = (uint32_t)hal_get_cycles();
156if( DEBUG_VMM_MMAP_ALLOC < cycle )
157printk("\n[%s] thread[%x,%x] enter / cycle %d\n",
158__FUNCTION__, this->process->pid, this->trdid, cycle );
159#endif
160
161    // number of allocated pages must be power of 2
162    // compute actual size and order
163    size  = POW2_ROUNDUP( npages );
164    order = bits_log2( size );
165
166    // get mmap allocator pointer
167    mmap_mgr_t * mgr = &vmm->mmap_mgr;
168
169    // build extended pointer on root of zombi_list[order]
170    xptr_t root_xp = XPTR( local_cxy , &mgr->zombi_list[order] );
171
172    // take lock protecting zombi_lists
173    busylock_acquire( &mgr->lock );
174
175    // get vseg from zombi_list or from mmap zone
176    if( xlist_is_empty( root_xp ) )                   // from mmap zone
177    {
178        // check overflow
179        free = mgr->first_free_vpn;
180        if( (free + size) > mgr->vpn_size ) return -1;
181
182        // update MMAP allocator
183        mgr->first_free_vpn += size;
184
185        // compute base
186        base = free;
187    }
188    else                                              // from zombi_list
189    {
190        // get pointer on zombi vseg from zombi_list
191        vseg_xp = XLIST_FIRST( root_xp , vseg_t , xlist );
192        vseg    = GET_PTR( vseg_xp );
193
194        // remove vseg from free-list
195        xlist_unlink( XPTR( local_cxy , &vseg->xlist ) );
196
197        // compute base
198        base = vseg->vpn_base;
199    }
200
201    // release lock
202    busylock_release( &mgr->lock );
203
204#if DEBUG_VMM_MMAP_ALLOC
205cycle = (uint32_t)hal_get_cycles();
206if( DEBUG_VMM_DESTROY < cycle )
207printk("\n[%s] thread[%x,%x] exit / vpn_base %x / vpn_size %x / cycle %d\n",
208__FUNCTION__, this->process->pid, this->trdid, base, size, cycle );
209#endif
210
211    // returns vpn_base, vpn_size
212    *vpn_base = base;
213    *vpn_size = size;
214    return 0;
215
216}  // end vmm_mmap_alloc()
217
218////////////////////////////////////////////////////////////////////////////////////////////
219// This static function is called by the vmm_remove_vseg() function, and implements
220// the VMM MMAP specific desallocator.
221////////////////////////////////////////////////////////////////////////////////////////////
222// @ vmm      : [in] pointer on VMM.
223// @ vseg     : [in] pointer on released vseg.
224////////////////////////////////////////////////////////////////////////////////////////////
225static void vmm_mmap_free( vmm_t  * vmm,
226                           vseg_t * vseg )
227{
228    // get pointer on mmap allocator
229    mmap_mgr_t * mgr = &vmm->mmap_mgr;
230
231    // compute zombi_list order
232    uint32_t order = bits_log2( vseg->vpn_size );
233
234    // take lock protecting zombi lists
235    busylock_acquire( &mgr->lock );
236
237    // update relevant zombi_list
238    xlist_add_first( XPTR( local_cxy , &mgr->zombi_list[order] ),
239                     XPTR( local_cxy , &vseg->xlist ) );
240
241    // release lock
242    busylock_release( &mgr->lock );
243
244}  // end of vmm_mmap_free()
245
246////////////////////////////////////////////////////////////////////////////////////////////
247// This static function registers one vseg in the VSL of a local process descriptor.
248////////////////////////////////////////////////////////////////////////////////////////////
249// vmm       : [in] pointer on VMM.
250// vseg      : [in] pointer on vseg.
251////////////////////////////////////////////////////////////////////////////////////////////
252void vmm_attach_vseg_to_vsl( vmm_t  * vmm,
253                             vseg_t * vseg )
254{
255    // update vseg descriptor
256    vseg->vmm = vmm;
257
258    // increment vsegs number
259    vmm->vsegs_nr++;
260
261    // add vseg in vmm list
262    xlist_add_last( XPTR( local_cxy , &vmm->vsegs_root ),
263                    XPTR( local_cxy , &vseg->xlist ) );
264
265}  // end vmm_attach_vseg_from_vsl()
266
267////////////////////////////////////////////////////////////////////////////////////////////
268// This static function removes one vseg from the VSL of a local process descriptor.
269////////////////////////////////////////////////////////////////////////////////////////////
270// vmm       : [in] pointer on VMM.
271// vseg      : [in] pointer on vseg.
272////////////////////////////////////////////////////////////////////////////////////////////
273void vmm_detach_vseg_from_vsl( vmm_t  * vmm,
274                               vseg_t * vseg )
275{
276    // update vseg descriptor
277    vseg->vmm = NULL;
278
279    // decrement vsegs number
280    vmm->vsegs_nr--;
281
282    // remove vseg from VSL
283    xlist_unlink( XPTR( local_cxy , &vseg->xlist ) );
284
285}  // end vmm_detach_from_vsl()
286
287////////////////////////////////////////////
288error_t vmm_user_init( process_t * process )
289{
290    uint32_t  i;
291
292#if DEBUG_VMM_USER_INIT
293thread_t * this = CURRENT_THREAD;
294uint32_t cycle = (uint32_t)hal_get_cycles();
295if( DEBUG_VMM_USER_INIT )
296printk("\n[%s] thread[%x,%x] enter for process %x in cluster %x / cycle %d\n", 
297__FUNCTION__ , this->process->pid, this->trdid, process->pid, local_cxy, cycle );
298#endif
299
300    // get pointer on VMM
301    vmm_t   * vmm = &process->vmm;
302
303// check UTILS zone
304assert( ((CONFIG_VMM_ARGS_SIZE + CONFIG_VMM_ENVS_SIZE) <= 
305         (CONFIG_VMM_ELF_BASE - CONFIG_VMM_UTILS_BASE)) ,
306         "UTILS zone too small\n" );
307
308// check STACK zone
309assert( ((CONFIG_VMM_STACK_SIZE * CONFIG_THREADS_MAX_PER_CLUSTER) <=
310(CONFIG_VMM_VSPACE_SIZE - CONFIG_VMM_STACK_BASE)) ,
311"STACK zone too small\n");
312
313    // initialize the lock protecting the VSL
314        remote_queuelock_init( XPTR( local_cxy , &vmm->vsl_lock ) , LOCK_VMM_VSL );
315
316
317/*
318    // register "args" vseg in VSL
319    base = CONFIG_VMM_UTILS_BASE << CONFIG_PPM_PAGE_SHIFT;
320    size = CONFIG_VMM_ARGS_SIZE << CONFIG_PPM_PAGE_SHIFT;
321
322    vseg_args = vmm_create_vseg( process,
323                                 VSEG_TYPE_DATA,
324                                 base,
325                                 size,
326                                 0,             // file_offset unused
327                                 0,             // file_size unused
328                                 XPTR_NULL,     // mapper_xp unused
329                                 local_cxy );
330    if( vseg_args == NULL )
331    {
332        printk("\n[ERROR] in %s : cannot register args vseg\n", __FUNCTION__ );
333        return -1;
334    }
335
336    vmm->args_vpn_base = base;
337
338    // register "envs" vseg in VSL
339    base = (CONFIG_VMM_UTILS_BASE + CONFIG_VMM_ARGS_SIZE) << CONFIG_PPM_PAGE_SHIFT;
340    size = CONFIG_VMM_ENVS_SIZE << CONFIG_PPM_PAGE_SHIFT;
341
342    vseg_envs = vmm_create_vseg( process,
343                                 VSEG_TYPE_DATA,
344                                 base,
345                                 size,
346                                 0,             // file_offset unused
347                                 0,             // file_size unused
348                                 XPTR_NULL,     // mapper_xp unused
349                                 local_cxy );
350    if( vseg_envs == NULL )
351    {
352        printk("\n[ERROR] in %s : cannot register envs vseg\n", __FUNCTION__ );
353        return -1;
354    }
355
356    vmm->envs_vpn_base = base;
357*/
358    // initialize STACK allocator
359    vmm->stack_mgr.bitmap   = 0;
360    vmm->stack_mgr.vpn_base = CONFIG_VMM_STACK_BASE;
361    busylock_init( &vmm->stack_mgr.lock , LOCK_VMM_STACK );
362
363    // initialize MMAP allocator
364    vmm->mmap_mgr.vpn_base        = CONFIG_VMM_HEAP_BASE;
365    vmm->mmap_mgr.vpn_size        = CONFIG_VMM_STACK_BASE - CONFIG_VMM_HEAP_BASE;
366    vmm->mmap_mgr.first_free_vpn  = CONFIG_VMM_HEAP_BASE;
367    busylock_init( &vmm->mmap_mgr.lock , LOCK_VMM_MMAP );
368    for( i = 0 ; i < 32 ; i++ )
369    {
370        xlist_root_init( XPTR( local_cxy , &vmm->mmap_mgr.zombi_list[i] ) );
371    }
372
373    // initialize instrumentation counters
374        vmm->false_pgfault_nr    = 0;
375        vmm->local_pgfault_nr    = 0;
376        vmm->global_pgfault_nr   = 0;
377        vmm->false_pgfault_cost  = 0;
378        vmm->local_pgfault_cost  = 0;
379        vmm->global_pgfault_cost = 0;
380
381    hal_fence();
382
383#if DEBUG_VMM_USER_INIT
384cycle = (uint32_t)hal_get_cycles();
385if( DEBUG_VMM_USER_INIT )
386printk("\n[%s] thread[%x,%x] exit for process %x in cluster %x / cycle %d\n", 
387__FUNCTION__, this->process->pid, this->trdid, process->pid, local_cxy, cycle );
388#endif
389
390    return 0;
391
392}  // end vmm_user_init()
393
394//////////////////////////////////////////
395void vmm_user_reset( process_t * process )
396{
397    xptr_t       vseg_xp;
398        vseg_t     * vseg;
399    vseg_type_t  vseg_type;
400
401#if DEBUG_VMM_USER_RESET
402uint32_t   cycle;
403thread_t * this = CURRENT_THREAD;
404#endif
405
406#if (DEBUG_VMM_USER_RESET & 1 )
407cycle = (uint32_t)hal_get_cycles();
408if( DEBUG_VMM_USER_RESET < cycle )
409printk("\n[%s] thread[%x,%x] enter for process %x in cluster %x / cycle %d\n",
410__FUNCTION__, this->process->pid, this->trdid, process->pid, local_cxy, cycle );
411#endif
412
413#if (DEBUG_VMM_USER_RESET & 1 )
414if( DEBUG_VMM_USER_RESET < cycle )
415hal_vmm_display( XPTR( local_cxy , process ) , true );
416#endif
417
418    // get pointer on local VMM
419    vmm_t * vmm = &process->vmm;
420
421    // build extended pointer on VSL root and VSL lock
422    xptr_t   root_xp = XPTR( local_cxy , &vmm->vsegs_root );
423    xptr_t   lock_xp = XPTR( local_cxy , &vmm->vsl_lock );
424
425    // take the VSL lock
426        remote_queuelock_acquire( lock_xp );
427
428    // scan the VSL to delete all non kernel vsegs
429    // (we don't use a FOREACH in case of item deletion)
430    xptr_t   iter_xp;
431    xptr_t   next_xp;
432        for( iter_xp = hal_remote_l64( root_xp ) ; 
433         iter_xp != root_xp ;
434         iter_xp = next_xp )
435        {
436        // save extended pointer on next item in xlist
437        next_xp = hal_remote_l64( iter_xp );
438
439        // get pointers on current vseg in VSL
440        vseg_xp   = XLIST_ELEMENT( iter_xp , vseg_t , xlist );
441        vseg      = GET_PTR( vseg_xp );
442        vseg_type = vseg->type;
443
444#if( DEBUG_VMM_USER_RESET & 1 )
445if( DEBUG_VMM_USER_RESET < cycle )
446printk("\n[%s] found %s vseg / vpn_base %x / vpn_size %d\n",
447__FUNCTION__ , vseg_type_str( vseg->type ), vseg->vpn_base, vseg->vpn_size );
448#endif
449        // delete non kernel vseg 
450        if( (vseg_type != VSEG_TYPE_KCODE) && 
451            (vseg_type != VSEG_TYPE_KDATA) && 
452            (vseg_type != VSEG_TYPE_KDEV ) )
453        {
454            // remove vseg from VSL
455            vmm_remove_vseg( process , vseg );
456
457#if( DEBUG_VMM_USER_RESET & 1 )
458if( DEBUG_VMM_USER_RESET < cycle )
459printk("\n[%s] %s vseg deleted / vpn_base %x / vpn_size %d\n",
460__FUNCTION__ , vseg_type_str( vseg->type ), vseg->vpn_base, vseg->vpn_size );
461#endif
462        }
463        else
464        {
465
466#if( DEBUG_VMM_USER_RESET & 1 )
467if( DEBUG_VMM_USER_RESET < cycle )
468printk("\n[%s] keep %s vseg / vpn_base %x / vpn_size %d\n",
469__FUNCTION__ , vseg_type_str( vseg->type ), vseg->vpn_base, vseg->vpn_size );
470#endif
471        }
472        }  // end loop on vsegs in VSL
473
474    // release the VSL lock
475        remote_queuelock_release( lock_xp );
476
477// FIXME il faut gérer les process copies...
478
479#if DEBUG_VMM_USER_RESET
480cycle = (uint32_t)hal_get_cycles();
481if( DEBUG_VMM_USER_RESET < cycle )
482printk("\n[%s] thread[%x,%x] exit for process %x in cluster %x / cycle %d\n",
483__FUNCTION__, this->process->pid, this->trdid, process->pid, local_cxy , cycle );
484#endif
485
486#if (DEBUG_VMM_USER_RESET & 1 )
487if( DEBUG_VMM_USER_RESET < cycle )
488hal_vmm_display( XPTR( local_cxy , process ) , true );
489#endif
490
491}  // end vmm_user_reset()
492
493/////////////////////////////////////////////////
494void vmm_global_delete_vseg( process_t * process,
495                             intptr_t    base )
496{
497    pid_t           pid;
498    cxy_t           owner_cxy;
499    lpid_t          owner_lpid;
500
501    xlist_entry_t * process_root_ptr;
502    xptr_t          process_root_xp;
503    xptr_t          process_iter_xp;
504
505    xptr_t          remote_process_xp;
506    cxy_t           remote_process_cxy;
507    process_t     * remote_process_ptr;
508
509    xptr_t          vsl_root_xp;
510    xptr_t          vsl_lock_xp;
511    xptr_t          vsl_iter_xp;
512
513#if DEBUG_VMM_GLOBAL_DELETE_VSEG
514uint32_t cycle = (uint32_t)hal_get_cycles();
515thread_t * this = CURRENT_THREAD;
516#endif
517
518#if (DEBUG_VMM_GLOBAL_DELETE_VSEG & 1)
519if( DEBUG_VMM_GLOBAL_DELETE_VSEG < cycle )
520printk("\n[%s] thread[%x,%x] : process %x / base %x / cycle %d\n",
521__FUNCTION__, this->process->pid, this->trdid, process->pid, base, cycle );
522#endif
523
524    // get owner process cluster and local index
525    pid              = process->pid;
526    owner_cxy        = CXY_FROM_PID( pid );
527    owner_lpid       = LPID_FROM_PID( pid );
528
529    // get extended pointer on root of process copies xlist in owner cluster
530    process_root_ptr = &LOCAL_CLUSTER->pmgr.copies_root[owner_lpid];
531    process_root_xp  = XPTR( owner_cxy , process_root_ptr );
532
533    // loop on process copies
534    XLIST_FOREACH( process_root_xp , process_iter_xp )
535    {
536        // get cluster and local pointer on remote process
537        remote_process_xp  = XLIST_ELEMENT( process_iter_xp , process_t , copies_list );
538        remote_process_ptr = GET_PTR( remote_process_xp );
539        remote_process_cxy = GET_CXY( remote_process_xp );
540
541        // build extended pointers on remote VSL root and lock
542        vsl_root_xp = XPTR( remote_process_cxy , &remote_process_ptr->vmm.vsegs_root );
543        vsl_lock_xp = XPTR( remote_process_cxy , &remote_process_ptr->vmm.vsl_lock );
544
545        // get lock on remote VSL
546        remote_queuelock_acquire( vsl_lock_xp );
547
548        // loop on vsegs in remote process VSL
549        XLIST_FOREACH( vsl_root_xp , vsl_iter_xp )
550        {
551            // get pointers on current vseg
552            xptr_t   vseg_xp  = XLIST_ELEMENT( vsl_iter_xp , vseg_t , xlist );
553            vseg_t * vseg_ptr = GET_PTR( vseg_xp );
554
555            // get current vseg base address
556            intptr_t vseg_base = (intptr_t)hal_remote_lpt( XPTR( remote_process_cxy,
557                                                                 &vseg_ptr->min ) );
558
559            if( vseg_base == base )   // found searched vseg
560            {
561                if( remote_process_cxy == local_cxy )
562                {
563                    vmm_remove_vseg( process,
564                                     vseg_ptr );
565                }
566                else
567                {
568                    rpc_vmm_remove_vseg_client( remote_process_cxy,
569                                                remote_process_ptr,
570                                                vseg_ptr );
571                }
572
573#if (DEBUG_VMM_GLOBAL_DELETE_VSEG & 1)
574if( DEBUG_VMM_GLOBAL_DELETE_VSEG < cycle )
575printk("\n[%s] thread[%x,%x] deleted vseg %x for process %x in cluster %x\n",
576__FUNCTION__, this->process->pid, this->trdid, base, process->pid, remote_process_cxy );
577#endif
578
579            }
580        }  // end of loop on vsegs
581
582#if (DEBUG_VMM_GLOBAL_DELETE_VSEG & 1)
583if( DEBUG_VMM_GLOBAL_DELETE_VSEG < cycle )
584hal_vmm_display( remote_process_xp , false );
585#endif
586
587        // release lock on remote VSL
588        remote_queuelock_release( vsl_lock_xp );
589
590    }  // end of loop on process copies
591
592#if DEBUG_VMM_GLOBAL_DELETE_VSEG
593cycle = (uint32_t)hal_get_cycles();
594if( DEBUG_VMM_GLOBAL_DELETE_VSEG < cycle )
595printk("\n[%s] thread[%x,%x] exit for process %x / base %x / cycle %d\n",
596__FUNCTION__, this->process->pid, this->trdid, process->pid , base, cycle );
597#endif
598
599}  // end vmm_global_delete_vseg()
600
601////////////////////////////////////////////////
602void vmm_global_resize_vseg( process_t * process,
603                             intptr_t    base,
604                             intptr_t    new_base,
605                             intptr_t    new_size )
606{
607    pid_t           pid;
608    cxy_t           owner_cxy;
609    lpid_t          owner_lpid;
610
611    xlist_entry_t * process_root_ptr;
612    xptr_t          process_root_xp;
613    xptr_t          process_iter_xp;
614
615    xptr_t          remote_process_xp;
616    cxy_t           remote_process_cxy;
617    process_t     * remote_process_ptr;
618
619    xptr_t          vsl_root_xp;
620    xptr_t          vsl_lock_xp;
621    xptr_t          vsl_iter_xp;
622
623#if DEBUG_VMM_GLOBAL_RESIZE_VSEG
624uint32_t cycle = (uint32_t)hal_get_cycles();
625thread_t * this = CURRENT_THREAD;
626#endif
627
628#if (DEBUG_VMM_GLOBAL_RESIZE_VSEG & 1)
629if( DEBUG_VMM_GLOBAL_RESIZE_VSEG < cycle )
630printk("\n[%s] thread[%x,%x] : process %x / base %x / new_base %x / new_size %x / cycle %d\n",
631__FUNCTION__, this->process->pid, this->trdid, process->pid, base, new_base, new_size, cycle );
632#endif
633
634    // get owner process cluster and local index
635    pid              = process->pid;
636    owner_cxy        = CXY_FROM_PID( pid );
637    owner_lpid       = LPID_FROM_PID( pid );
638
639    // get extended pointer on root of process copies xlist in owner cluster
640    process_root_ptr = &LOCAL_CLUSTER->pmgr.copies_root[owner_lpid];
641    process_root_xp  = XPTR( owner_cxy , process_root_ptr );
642
643    // loop on process copies
644    XLIST_FOREACH( process_root_xp , process_iter_xp )
645    {
646        // get cluster and local pointer on remote process
647        remote_process_xp  = XLIST_ELEMENT( process_iter_xp , process_t , copies_list );
648        remote_process_ptr = GET_PTR( remote_process_xp );
649        remote_process_cxy = GET_CXY( remote_process_xp );
650
651        // build extended pointers on remote VSL root and lock
652        vsl_root_xp = XPTR( remote_process_cxy , &remote_process_ptr->vmm.vsegs_root );
653        vsl_lock_xp = XPTR( remote_process_cxy , &remote_process_ptr->vmm.vsl_lock );
654
655        // get lock on remote VSL
656        remote_queuelock_acquire( vsl_lock_xp );
657
658        // loop on vsegs in remote process VSL
659        XLIST_FOREACH( vsl_root_xp , vsl_iter_xp )
660        {
661            // get pointers on current vseg
662            xptr_t   vseg_xp  = XLIST_ELEMENT( vsl_iter_xp , vseg_t , xlist );
663            vseg_t * vseg_ptr = GET_PTR( vseg_xp );
664
665            // get current vseg base address
666            intptr_t vseg_base = (intptr_t)hal_remote_lpt( XPTR( remote_process_cxy,
667                                                                 &vseg_ptr->min ) );
668
669            if( vseg_base == base )   // found searched vseg
670            {
671                if( remote_process_cxy == local_cxy )
672                {
673                    vmm_resize_vseg( remote_process_ptr,
674                                     vseg_ptr,
675                                     new_base,
676                                     new_size );
677                }
678                else
679                {
680                    rpc_vmm_resize_vseg_client( remote_process_cxy,
681                                                remote_process_ptr,
682                                                vseg_ptr,
683                                                new_base,
684                                                new_size );
685                }
686 
687#if (DEBUG_VMM_GLOBAL_RESIZE_VSEG & 1)
688if( DEBUG_VMM_GLOBAL_RESIZE_VSEG < cycle )
689printk("\n[%s] thread[%x,%x] resized vseg %x for process %x in cluster %x\n",
690__FUNCTION__, this->process->pid, this->trdid, base, process->pid, remote_process_cxy );
691#endif
692
693            }
694        }  // end of loop on vsegs
695
696#if (DEBUG_VMM_GLOBAL_RESIZE_VSEG & 1)
697if( DEBUG_VMM_GLOBAL_RESIZE_VSEG < cycle )
698hal_vmm_display( remote_process_xp , false );
699#endif
700
701        // release lock on remote VSL
702        remote_queuelock_release( vsl_lock_xp );
703    }  // end of loop on process copies
704
705#if DEBUG_VMM_GLOBAL_RESIZE_VSEG
706cycle = (uint32_t)hal_get_cycles();
707if( DEBUG_VMM_GLOBAL_RESIZE_VSEG < cycle )
708printk("\n[%s] thread[%x,%x] exit for process %x / base %x / cycle %d\n",
709__FUNCTION__, this->process->pid, this->trdid, process->pid , base, cycle );
710#endif
711
712}  // end vmm_global_resize_vseg()
713
714////////////////////////////////////////////////
715void vmm_global_update_pte( process_t * process,
716                            vpn_t       vpn,
717                            uint32_t    attr,
718                            ppn_t       ppn )
719{
720    pid_t           pid;
721    cxy_t           owner_cxy;
722    lpid_t          owner_lpid;
723
724    xlist_entry_t * process_root_ptr;
725    xptr_t          process_root_xp;
726    xptr_t          process_iter_xp;
727
728    xptr_t          remote_process_xp;
729    cxy_t           remote_process_cxy;
730    process_t     * remote_process_ptr;
731    xptr_t          remote_gpt_xp;
732
733#if DEBUG_VMM_GLOBAL_UPDATE_PTE
734uint32_t cycle = (uint32_t)hal_get_cycles();
735thread_t * this = CURRENT_THREAD;
736#endif
737
738
739#if (DEBUG_VMM_GLOBAL_UPDATE_PTE & 1)
740if( DEBUG_VMM_GLOBAL_UPDATE_PTE < cycle )
741printk("\n[%s] thread[%x,%x] enter for process %x / vpn %x / attr %x / ppn %x / ycle %d\n",
742__FUNCTION__, this->process->pid, this->trdid, process->pid, vpn, attr, ppn, cycle );
743#endif
744
745    // get owner process cluster and local index
746    pid              = process->pid;
747    owner_cxy        = CXY_FROM_PID( pid );
748    owner_lpid       = LPID_FROM_PID( pid );
749
750    // get extended pointer on root of process copies xlist in owner cluster
751    process_root_ptr = &LOCAL_CLUSTER->pmgr.copies_root[owner_lpid];
752    process_root_xp  = XPTR( owner_cxy , process_root_ptr );
753
754    // loop on process copies
755    XLIST_FOREACH( process_root_xp , process_iter_xp )
756    {
757        // get cluster and local pointer on remote process
758        remote_process_xp  = XLIST_ELEMENT( process_iter_xp , process_t , copies_list );
759        remote_process_ptr = GET_PTR( remote_process_xp );
760        remote_process_cxy = GET_CXY( remote_process_xp );
761
762#if (DEBUG_VMM_GLOBAL_UPDATE_PTE & 1)
763if( DEBUG_VMM_GLOBAL_UPDATE_PTE < cycle )
764printk("\n[%s] thread[%x,%x] handling vpn %x for process %x in cluster %x\n",
765__FUNCTION__, this->process->pid, this->trdid, vpn, process->pid, remote_process_cxy );
766#endif
767
768        // get extended pointer on remote gpt
769        remote_gpt_xp = XPTR( remote_process_cxy , &remote_process_ptr->vmm.gpt );
770
771        // update remote GPT
772        hal_gpt_update_pte( remote_gpt_xp, vpn, attr, ppn );
773    } 
774
775#if DEBUG_VMM_GLOBAL_UPDATE_PTE
776cycle = (uint32_t)hal_get_cycles();
777if( DEBUG_VMM_GLOBAL_UPDATE_PTE < cycle )
778printk("\n[%s] thread[%x,%x] exit for process %x / vpn %x / cycle %d\n",
779__FUNCTION__, this->process->pid, this->trdid, process->pid , vpn , cycle );
780#endif
781
782#if (DEBUG_VMM_GLOBAL_UPDATE_PTE & 1)
783hal_vmm_display( process , true );
784#endif
785
786}  // end vmm_global_update_pte()
787
788///////////////////////////////////////
789void vmm_set_cow( process_t * process )
790{
791    vmm_t         * vmm;
792
793    xlist_entry_t * process_root_ptr;
794    xptr_t          process_root_xp;
795    xptr_t          process_iter_xp;
796
797    xptr_t          remote_process_xp;
798    cxy_t           remote_process_cxy;
799    process_t     * remote_process_ptr;
800    xptr_t          remote_gpt_xp;
801
802    xptr_t          vseg_root_xp;
803    xptr_t          vseg_iter_xp;
804
805    xptr_t          vseg_xp;
806    vseg_t        * vseg;
807
808    pid_t           pid;
809    cxy_t           owner_cxy;
810    lpid_t          owner_lpid;
811
812    // get target process PID
813    pid = process->pid;
814
815#if DEBUG_VMM_SET_COW
816uint32_t   cycle = (uint32_t)hal_get_cycles();
817thread_t * this  = CURRENT_THREAD;
818if( DEBUG_VMM_SET_COW < cycle )
819printk("\n[%s] thread[%x,%x] enter for process %x / cycle %d\n",
820__FUNCTION__, this->process->pid, this->trdid, pid , cycle );
821#endif
822
823#if (DEBUG_VMM_SET_COW & 1)
824if( DEBUG_VMM_SET_COW < cycle )
825hal_vmm_display( process , true );
826#endif
827
828// check cluster is reference
829assert( (XPTR( local_cxy , process ) == process->ref_xp),
830"local cluster must be process reference cluster\n");
831
832    // get pointer on reference VMM
833    vmm = &process->vmm;
834
835    // get extended pointer on root of process copies xlist in owner cluster
836    owner_cxy        = CXY_FROM_PID( pid );
837    owner_lpid       = LPID_FROM_PID( pid );
838    process_root_ptr = &LOCAL_CLUSTER->pmgr.copies_root[owner_lpid];
839    process_root_xp  = XPTR( owner_cxy , process_root_ptr );
840
841    // get extended pointer on root of vsegs xlist from reference VMM
842    vseg_root_xp  = XPTR( local_cxy , &vmm->vsegs_root ); 
843
844    // loop on target process copies
845    XLIST_FOREACH( process_root_xp , process_iter_xp )
846    {
847        // get cluster and local pointer on remote process copy
848        remote_process_xp  = XLIST_ELEMENT( process_iter_xp , process_t , copies_list );
849        remote_process_ptr = GET_PTR( remote_process_xp );
850        remote_process_cxy = GET_CXY( remote_process_xp );
851
852#if (DEBUG_VMM_SET_COW & 1)
853if( DEBUG_VMM_SET_COW < cycle )
854printk("\n[%s] thread[%x,%x] (%x) handles process %x in cluster %x\n",
855__FUNCTION__, this->process->pid, this->trdid, this, pid, remote_process_cxy );
856#endif
857
858        // get extended pointer on remote gpt
859        remote_gpt_xp = XPTR( remote_process_cxy , &remote_process_ptr->vmm.gpt );
860
861        // loop on vsegs in (local) reference process VSL
862        XLIST_FOREACH( vseg_root_xp , vseg_iter_xp )
863        {
864            // get pointer on vseg
865            vseg_xp  = XLIST_ELEMENT( vseg_iter_xp , vseg_t , xlist );
866            vseg     = GET_PTR( vseg_xp );
867
868            // get vseg type, base and size
869            uint32_t type     = vseg->type;
870            vpn_t    vpn_base = vseg->vpn_base;
871            vpn_t    vpn_size = vseg->vpn_size;
872
873#if (DEBUG_VMM_SET_COW & 1)
874if( DEBUG_VMM_SET_COW < cycle )
875printk("\n[%s] thread[%x,%x] found vseg %s / vpn_base = %x / vpn_size = %x\n",
876__FUNCTION__, this->process->pid, this->trdid, vseg_type_str(type), vpn_base, vpn_size );
877#endif
878            // only DATA, ANON and REMOTE vsegs
879            if( (type == VSEG_TYPE_DATA)  ||
880                (type == VSEG_TYPE_ANON)  ||
881                (type == VSEG_TYPE_REMOTE) )
882            {
883                vpn_t      vpn;
884                uint32_t   attr;
885                ppn_t      ppn;
886                xptr_t     page_xp;
887                cxy_t      page_cxy;
888                page_t   * page_ptr;
889                xptr_t     forks_xp;
890                xptr_t     lock_xp;
891
892                // update flags in remote GPT
893                hal_gpt_set_cow( remote_gpt_xp,
894                                 vpn_base,
895                                 vpn_size ); 
896
897                // atomically increment pending forks counter in physical pages,
898                // this is only done once, when handling the reference copy
899                if( remote_process_cxy == local_cxy )
900                {
901
902#if (DEBUG_VMM_SET_COW & 1)
903if( DEBUG_VMM_SET_COW < cycle )
904printk("\n[%s] thread[%x,%x] handles vseg %s / vpn_base = %x / vpn_size = %x\n",
905__FUNCTION__, this->process->pid, this->trdid, vseg_type_str(type), vpn_base, vpn_size );
906#endif
907                    // scan all pages in vseg
908                    for( vpn = vpn_base ; vpn < (vpn_base + vpn_size) ; vpn++ )
909                    {
910                        // get page attributes and PPN from reference GPT
911                        hal_gpt_get_pte( remote_gpt_xp , vpn , &attr , &ppn ); 
912
913                        // atomically update pending forks counter if page is mapped
914                        if( attr & GPT_MAPPED )
915                        {
916                            // get pointers and cluster on page descriptor
917                            page_xp  = ppm_ppn2page( ppn );
918                            page_cxy = GET_CXY( page_xp );
919                            page_ptr = GET_PTR( page_xp );
920
921                            // get extended pointers on "forks" and "lock"
922                            forks_xp = XPTR( page_cxy , &page_ptr->forks );
923                            lock_xp  = XPTR( page_cxy , &page_ptr->lock );
924
925                            // take lock protecting "forks" counter
926                            remote_busylock_acquire( lock_xp );
927
928                            // increment "forks"
929                            hal_remote_atomic_add( forks_xp , 1 );
930
931                            // release lock protecting "forks" counter
932                            remote_busylock_release( lock_xp );
933                        }
934                    }   // end loop on vpn
935
936#if (DEBUG_VMM_SET_COW & 1)
937if( DEBUG_VMM_SET_COW < cycle )
938printk("\n[%s] thread[%x,%x] completes vseg %s / vpn_base = %x / vpn_size = %x\n",
939__FUNCTION__, this->process->pid, this->trdid, vseg_type_str(type), vpn_base, vpn_size );
940#endif
941                }   // end if local
942            }   // end if vseg type
943        }   // end loop on vsegs
944    }   // end loop on process copies
945 
946#if DEBUG_VMM_SET_COW
947cycle = (uint32_t)hal_get_cycles();
948if( DEBUG_VMM_SET_COW < cycle )
949printk("\n[%s] thread[%x,%x] exit for process %x / cycle %d\n",
950__FUNCTION__, this->process->pid, this->trdid, process->pid , cycle );
951#endif
952
953}  // end vmm_set-cow()
954
955/////////////////////////////////////////////////
956error_t vmm_fork_copy( process_t * child_process,
957                       xptr_t      parent_process_xp )
958{
959    error_t     error;
960    cxy_t       parent_cxy;
961    process_t * parent_process;
962    vmm_t     * parent_vmm;
963    xptr_t      parent_lock_xp;
964    vmm_t     * child_vmm;
965    xptr_t      iter_xp;
966    xptr_t      parent_vseg_xp;
967    vseg_t    * parent_vseg;
968    vseg_t    * child_vseg;
969    uint32_t    type;
970    vpn_t       vpn;           
971    vpn_t       vpn_base;
972    vpn_t       vpn_size;
973    xptr_t      parent_root_xp;
974    bool_t      mapped; 
975    ppn_t       ppn;
976
977#if DEBUG_VMM_FORK_COPY
978uint32_t cycle = (uint32_t)hal_get_cycles();
979thread_t * this = CURRENT_THREAD;
980if( DEBUG_VMM_FORK_COPY < cycle )
981printk("\n[%s] thread %x enter / cycle %d\n",
982__FUNCTION__ , this->process->pid, this->trdid, cycle );
983#endif
984
985    // get parent process cluster and local pointer
986    parent_cxy     = GET_CXY( parent_process_xp );
987    parent_process = GET_PTR( parent_process_xp );
988
989    // get local pointers on parent and child VMM
990    parent_vmm = &parent_process->vmm; 
991    child_vmm  = &child_process->vmm;
992
993    // build extended pointer on parent VSL root and lock
994    parent_root_xp = XPTR( parent_cxy , &parent_vmm->vsegs_root );
995    parent_lock_xp = XPTR( parent_cxy , &parent_vmm->vsl_lock );
996
997    // take the lock protecting the parent VSL
998    remote_queuelock_acquire( parent_lock_xp );
999
1000    // loop on parent VSL xlist
1001    XLIST_FOREACH( parent_root_xp , iter_xp )
1002    {
1003        // get pointers on current parent vseg
1004        parent_vseg_xp = XLIST_ELEMENT( iter_xp , vseg_t , xlist );
1005        parent_vseg    = GET_PTR( parent_vseg_xp );
1006
1007        // get vseg type
1008        type = hal_remote_l32( XPTR( parent_cxy , &parent_vseg->type ) );
1009       
1010#if DEBUG_VMM_FORK_COPY
1011cycle = (uint32_t)hal_get_cycles();
1012if( DEBUG_VMM_FORK_COPY < cycle )
1013printk("\n[%s] thread[%x,%x] found parent vseg %s / vpn_base = %x / cycle %d\n",
1014__FUNCTION__ , this->process->pid, this->trdid, vseg_type_str(type),
1015hal_remote_l32( XPTR( parent_cxy , &parent_vseg->vpn_base ) ) , cycle );
1016#endif
1017
1018        // all parent vsegs - but STACK and kernel vsegs - must be copied in child VSL
1019        if( (type != VSEG_TYPE_STACK) && (type != VSEG_TYPE_KCODE) &&
1020            (type != VSEG_TYPE_KDATA) && (type != VSEG_TYPE_KDEV) )
1021        {
1022            // allocate memory for a new child vseg
1023            child_vseg = vseg_alloc();
1024            if( child_vseg == NULL )   // release all allocated vsegs
1025            {
1026                vmm_destroy( child_process );
1027                printk("\n[ERROR] in %s : cannot create vseg for child\n", __FUNCTION__ );
1028                return -1;
1029            }
1030
1031            // copy parent vseg to child vseg
1032            vseg_init_from_ref( child_vseg , parent_vseg_xp );
1033
1034            // build extended pointer on child VSL lock
1035            xptr_t child_lock_xp = XPTR( local_cxy , &child_vmm->vsl_lock );
1036 
1037            // take the child VSL lock
1038            remote_queuelock_acquire( child_lock_xp );
1039
1040            // register child vseg in child VSL
1041            vmm_attach_vseg_to_vsl( child_vmm , child_vseg );
1042
1043            // release the child VSL lock
1044            remote_queuelock_release( child_lock_xp );
1045
1046#if DEBUG_VMM_FORK_COPY
1047cycle = (uint32_t)hal_get_cycles();
1048if( DEBUG_VMM_FORK_COPY < cycle )
1049printk("\n[%s] thread[%x,%x] copied vseg %s / vpn_base = %x to child VSL / cycle %d\n",
1050__FUNCTION__ , this->process->pid, this->trdid, vseg_type_str(type),
1051hal_remote_l32( XPTR( parent_cxy , &parent_vseg->vpn_base ) ) , cycle );
1052#endif
1053            // copy DATA, ANON, REMOTE, FILE parent GPT entries to child GPT
1054            if( type != VSEG_TYPE_CODE )
1055            {
1056                // activate the COW for DATA, ANON, REMOTE vsegs only
1057                // cow = ( type != VSEG_TYPE_FILE );
1058
1059                vpn_base = child_vseg->vpn_base;
1060                vpn_size = child_vseg->vpn_size;
1061
1062                // scan pages in parent vseg
1063                for( vpn = vpn_base ; vpn < (vpn_base + vpn_size) ; vpn++ )
1064                {
1065                    error = hal_gpt_pte_copy( &child_vmm->gpt,
1066                                              vpn,
1067                                              XPTR( parent_cxy , &parent_vmm->gpt ),
1068                                              vpn,
1069                                              false,      // does not handle COW flag
1070                                              &ppn,       // unused
1071                                              &mapped );  // unused
1072                    if( error )
1073                    {
1074                        vmm_destroy( child_process );
1075                        printk("\n[ERROR] in %s : cannot copy GPT\n", __FUNCTION__ );
1076                        return -1;
1077                    }
1078
1079#if DEBUG_VMM_FORK_COPY
1080cycle = (uint32_t)hal_get_cycles();
1081if( DEBUG_VMM_FORK_COPY < cycle )
1082printk("\n[%s] thread[%x,%x] copied vpn %x to child GPT / cycle %d\n",
1083__FUNCTION__ , this->process->pid, this->trdid , vpn , cycle );
1084#endif
1085                }
1086            }   // end if no code & no stack
1087        }   // end if no stack
1088    }   // end loop on vsegs
1089
1090    // release the parent VSL lock in read mode
1091    remote_queuelock_release( parent_lock_xp );
1092
1093    // initialize the child VMM STACK allocator
1094    child_vmm->stack_mgr.bitmap   = 0;
1095    child_vmm->stack_mgr.vpn_base = CONFIG_VMM_STACK_BASE;
1096
1097    // initialize the child VMM MMAP allocator
1098    uint32_t i;
1099    child_vmm->mmap_mgr.vpn_base        = CONFIG_VMM_HEAP_BASE;
1100    child_vmm->mmap_mgr.vpn_size        = CONFIG_VMM_STACK_BASE - CONFIG_VMM_HEAP_BASE;
1101    child_vmm->mmap_mgr.first_free_vpn  = CONFIG_VMM_HEAP_BASE;
1102    for( i = 0 ; i < 32 ; i++ ) 
1103    {
1104        xlist_root_init( XPTR( local_cxy , &child_vmm->mmap_mgr.zombi_list[i] ) );
1105    }
1106
1107    // initialize instrumentation counters
1108        child_vmm->false_pgfault_nr    = 0;
1109        child_vmm->local_pgfault_nr    = 0;
1110        child_vmm->global_pgfault_nr   = 0;
1111        child_vmm->false_pgfault_cost  = 0;
1112        child_vmm->local_pgfault_cost  = 0;
1113        child_vmm->global_pgfault_cost = 0;
1114
1115    // copy base addresses from parent VMM to child VMM
1116    child_vmm->args_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->args_vpn_base));
1117    child_vmm->envs_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->envs_vpn_base));
1118    child_vmm->heap_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->heap_vpn_base));
1119    child_vmm->code_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->code_vpn_base));
1120    child_vmm->data_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->data_vpn_base));
1121
1122    child_vmm->entry_point = (intptr_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->entry_point));
1123
1124    hal_fence();
1125
1126#if DEBUG_VMM_FORK_COPY
1127cycle = (uint32_t)hal_get_cycles();
1128if( DEBUG_VMM_FORK_COPY < cycle )
1129printk("\n[%s] thread[%x,%x] exit successfully / cycle %d\n",
1130__FUNCTION__ , this->process->pid, this->trdid , cycle );
1131#endif
1132
1133    return 0;
1134
1135}  // vmm_fork_copy()
1136
1137///////////////////////////////////////
1138void vmm_destroy( process_t * process )
1139{
1140    xptr_t   vseg_xp;
1141        vseg_t * vseg;
1142
1143#if DEBUG_VMM_DESTROY
1144uint32_t   cycle = (uint32_t)hal_get_cycles();
1145thread_t * this  = CURRENT_THREAD;
1146if( DEBUG_VMM_DESTROY < cycle )
1147printk("\n[%s] thread[%x,%x] enter for process %x in cluster %x / cycle %d\n",
1148__FUNCTION__, this->process->pid, this->trdid, process->pid, local_cxy, cycle );
1149#endif
1150
1151#if (DEBUG_VMM_DESTROY & 1 )
1152if( DEBUG_VMM_DESTROY < cycle )
1153hal_vmm_display( XPTR( local_cxy, process ) , true );
1154#endif
1155
1156    // get pointer on local VMM
1157    vmm_t  * vmm = &process->vmm;
1158
1159    // build extended pointer on VSL root, VSL lock and GPT lock
1160    xptr_t   vsl_root_xp = XPTR( local_cxy , &vmm->vsegs_root );
1161    xptr_t   vsl_lock_xp = XPTR( local_cxy , &vmm->vsl_lock );
1162
1163    // take the VSL lock
1164    remote_queuelock_acquire( vsl_lock_xp );
1165
1166    // scan the VSL to delete all registered vsegs
1167    // (we don't use a FOREACH in case of item deletion)
1168    xptr_t  iter_xp;
1169    xptr_t  next_xp;
1170        for( iter_xp = hal_remote_l64( vsl_root_xp ) ; 
1171         iter_xp != vsl_root_xp ;
1172         iter_xp = next_xp )
1173        {
1174        // save extended pointer on next item in xlist
1175        next_xp = hal_remote_l64( iter_xp );
1176
1177        // get pointers on current vseg in VSL
1178        vseg_xp   = XLIST_ELEMENT( iter_xp , vseg_t , xlist );
1179        vseg      = GET_PTR( vseg_xp );
1180
1181        // delete vseg and release physical pages
1182        vmm_remove_vseg( process , vseg );
1183
1184#if( DEBUG_VMM_DESTROY & 1 )
1185if( DEBUG_VMM_DESTROY < cycle )
1186printk("\n[%s] %s vseg deleted / vpn_base %x / vpn_size %d\n",
1187__FUNCTION__ , vseg_type_str( vseg->type ), vseg->vpn_base, vseg->vpn_size );
1188#endif
1189
1190        }
1191
1192    // release the VSL lock
1193    remote_queuelock_release( vsl_lock_xp );
1194
1195    // remove all registered MMAP vsegs
1196    // from zombi_lists in MMAP allocator
1197    uint32_t i;
1198    for( i = 0 ; i<32 ; i++ )
1199    {
1200        // build extended pointer on zombi_list[i]
1201        xptr_t root_xp = XPTR( local_cxy , &vmm->mmap_mgr.zombi_list[i] );
1202 
1203        // scan zombi_list[i]
1204            while( !xlist_is_empty( root_xp ) )
1205            {
1206                    vseg_xp = XLIST_FIRST( root_xp , vseg_t , xlist );
1207            vseg    = GET_PTR( vseg_xp );
1208
1209#if( DEBUG_VMM_DESTROY & 1 )
1210if( DEBUG_VMM_DESTROY < cycle )
1211printk("\n[%s] found zombi vseg / vpn_base %x / vpn_size %d\n",
1212__FUNCTION__ , vseg_type_str( vseg->type ), vseg->vpn_base, vseg->vpn_size );
1213#endif
1214            // clean vseg descriptor
1215            vseg->vmm = NULL;
1216
1217            // remove vseg from  zombi_list
1218            xlist_unlink( XPTR( local_cxy , &vseg->xlist ) );
1219
1220                    // release vseg descriptor
1221            vseg_free( vseg );
1222
1223#if( DEBUG_VMM_DESTROY & 1 )
1224if( DEBUG_VMM_DESTROY < cycle )
1225printk("\n[%s] zombi vseg released / vpn_base %x / vpn_size %d\n",
1226__FUNCTION__ , vseg_type_str( vseg->type ), vseg->vpn_base, vseg->vpn_size );
1227#endif
1228            }
1229    }
1230
1231    // release memory allocated to the GPT itself
1232    hal_gpt_destroy( &vmm->gpt );
1233
1234#if DEBUG_VMM_DESTROY
1235cycle = (uint32_t)hal_get_cycles();
1236if( DEBUG_VMM_DESTROY < cycle )
1237printk("\n[%s] thread[%x,%x] exit for process %x in cluster %x / cycle %d\n",
1238__FUNCTION__, this->process->pid, this->trdid, process->pid, local_cxy , cycle );
1239#endif
1240
1241}  // end vmm_destroy()
1242
1243/////////////////////////////////////////////////
1244vseg_t * vmm_check_conflict( process_t * process,
1245                             vpn_t       vpn_base,
1246                             vpn_t       vpn_size )
1247{
1248    vmm_t        * vmm = &process->vmm;
1249
1250    // scan the VSL
1251        vseg_t       * vseg;
1252    xptr_t         iter_xp;
1253    xptr_t         vseg_xp;
1254    xptr_t         root_xp = XPTR( local_cxy , &vmm->vsegs_root );
1255
1256        XLIST_FOREACH( root_xp , iter_xp )
1257        {
1258                vseg_xp = XLIST_ELEMENT( iter_xp , vseg_t , xlist );
1259        vseg    = GET_PTR( vseg_xp );
1260
1261                if( ((vpn_base + vpn_size) > vseg->vpn_base) &&
1262             (vpn_base < (vseg->vpn_base + vseg->vpn_size)) ) return vseg;
1263        }
1264    return NULL;
1265
1266}  // end vmm_check_conflict()
1267
1268////////////////////////////////////////////////
1269vseg_t * vmm_create_vseg( process_t   * process,
1270                              vseg_type_t   type,
1271                          intptr_t      base,         // ltid for VSEG_TYPE_STACK
1272                              uint32_t      size,
1273                          uint32_t      file_offset,
1274                          uint32_t      file_size,
1275                          xptr_t        mapper_xp,
1276                          cxy_t         cxy )
1277{
1278    vseg_t     * vseg;          // created vseg pointer
1279    vpn_t        vpn_base;      // first page index
1280    vpn_t        vpn_size;      // number of pages covered by vseg
1281        error_t      error;
1282
1283#if DEBUG_VMM_CREATE_VSEG
1284thread_t * this  = CURRENT_THREAD;
1285uint32_t   cycle;
1286#endif
1287
1288#if (DEBUG_VMM_CREATE_VSEG & 1)
1289cycle = (uint32_t)hal_get_cycles();
1290if( DEBUG_VMM_CREATE_VSEG < cycle )
1291printk("\n[%s] thread[%x,%x] enter / process %x / %s / base %x / cxy %x / cycle %d\n",
1292__FUNCTION__, this->process->pid, this->trdid,
1293process->pid, vseg_type_str(type), base, cxy, cycle );
1294#endif
1295
1296    // get pointer on VMM
1297        vmm_t * vmm    = &process->vmm;
1298
1299    // compute base, size, vpn_base, vpn_size, depending on vseg type
1300    // we use the VMM specific allocators for "stack", "file", "anon", & "remote" vsegs
1301
1302    if( type == VSEG_TYPE_STACK )
1303    {
1304        // get vpn_base and vpn_size from STACK allocator
1305        vmm_stack_alloc( vmm , base , &vpn_base , &vpn_size );
1306
1307        // compute vseg base and size from vpn_base and vpn_size
1308        base = vpn_base << CONFIG_PPM_PAGE_SHIFT;
1309        size = vpn_size << CONFIG_PPM_PAGE_SHIFT;
1310    }
1311    else if( type == VSEG_TYPE_FILE )
1312    {
1313        // compute page index (in mapper) for first byte
1314        vpn_t    vpn_min    = file_offset >> CONFIG_PPM_PAGE_SHIFT;
1315
1316        // compute page index (in mapper) for last byte
1317        vpn_t    vpn_max    = (file_offset + size - 1) >> CONFIG_PPM_PAGE_SHIFT;
1318
1319        // compute offset in first page
1320        uint32_t offset = file_offset & CONFIG_PPM_PAGE_MASK;
1321
1322        // compute number of pages required in virtual space
1323        vpn_t    npages      = vpn_max - vpn_min + 1;
1324
1325        // get vpn_base and vpn_size from MMAP allocator
1326        error = vmm_mmap_alloc( vmm , npages , &vpn_base , &vpn_size );
1327        if( error )
1328        {
1329            printk("\n[ERROR] in %s : no vspace for mmap vseg / process %x in cluster %x\n",
1330                   __FUNCTION__ , process->pid , local_cxy );
1331            return NULL;
1332        }
1333
1334        // set the vseg base (not always aligned for FILE)
1335        base = (vpn_base << CONFIG_PPM_PAGE_SHIFT) + offset; 
1336    }
1337    else if( (type == VSEG_TYPE_ANON) ||
1338             (type == VSEG_TYPE_REMOTE) )
1339    {
1340        // compute number of required pages in virtual space
1341        vpn_t npages = size >> CONFIG_PPM_PAGE_SHIFT;
1342        if( size & CONFIG_PPM_PAGE_MASK) npages++;
1343       
1344        // get vpn_base and vpn_size from MMAP allocator
1345        error = vmm_mmap_alloc( vmm , npages , &vpn_base , &vpn_size );
1346        if( error )
1347        {
1348            printk("\n[ERROR] in %s : no vspace for mmap vseg / process %x in cluster %x\n",
1349                   __FUNCTION__ , process->pid , local_cxy );
1350            return NULL;
1351        }
1352
1353        // set vseg base (always aligned for ANON or REMOTE)
1354        base = vpn_base << CONFIG_PPM_PAGE_SHIFT;
1355    }
1356    else    // VSEG_TYPE_DATA, VSEG_TYPE_CODE or KERNEL vseg
1357    {
1358        uint32_t vpn_min = base >> CONFIG_PPM_PAGE_SHIFT;
1359        uint32_t vpn_max = (base + size - 1) >> CONFIG_PPM_PAGE_SHIFT;
1360
1361        vpn_base = vpn_min;
1362            vpn_size = vpn_max - vpn_min + 1;
1363    }
1364
1365    // check collisions
1366    vseg = vmm_check_conflict( process , vpn_base , vpn_size );
1367
1368    if( vseg != NULL )
1369    {
1370        printk("\n[ERROR] in %s for process %x : new vseg [vpn_base %x / vpn_size %x]\n"
1371               "  overlap existing vseg [vpn_base %x / vpn_size %x]\n",
1372        __FUNCTION__ , process->pid, vpn_base, vpn_size, vseg->vpn_base, vseg->vpn_size );
1373        return NULL;
1374    }
1375
1376    // allocate physical memory for vseg descriptor
1377        vseg = vseg_alloc();
1378        if( vseg == NULL )
1379        {
1380            printk("\n[ERROR] in %s for process %x : cannot allocate memory for vseg\n",
1381        __FUNCTION__ , process->pid );
1382        return NULL;
1383        }
1384
1385#if (DEBUG_VMM_CREATE_VSEG & 1)
1386if( DEBUG_VMM_CREATE_VSEG < cycle )
1387printk("\n[%s] thread[%x,%x] : base %x / size %x / vpn_base %x / vpn_size %x\n",
1388__FUNCTION__, this->process->pid, this->trdid, base, size, vpn_base, vpn_size );
1389#endif
1390
1391    // initialize vseg descriptor
1392        vseg_init( vseg,
1393               type,
1394               base,
1395               size,
1396               vpn_base,
1397               vpn_size,
1398               file_offset,
1399               file_size,
1400               mapper_xp,
1401               cxy );
1402
1403    // build extended pointer on VSL lock
1404    xptr_t lock_xp = XPTR( local_cxy , &vmm->vsl_lock );
1405 
1406    // take the VSL lock in write mode
1407    remote_queuelock_acquire( lock_xp );
1408
1409    // attach vseg to VSL
1410        vmm_attach_vseg_to_vsl( vmm , vseg );
1411
1412    // release the VSL lock
1413    remote_queuelock_release( lock_xp );
1414
1415#if DEBUG_VMM_CREATE_VSEG
1416cycle = (uint32_t)hal_get_cycles();
1417// if( DEBUG_VMM_CREATE_VSEG < cycle )
1418if( type == VSEG_TYPE_REMOTE )
1419printk("\n[%s] thread[%x,%x] exit / process %x / %s / base %x / cxy %x / cycle %d\n",
1420__FUNCTION__, this->process->pid, this->trdid, 
1421process->pid, vseg_type_str(type), base, cxy, cycle );
1422#endif
1423
1424        return vseg;
1425
1426}  // vmm_create_vseg()
1427
1428////////////////////////////////////////////////////////////////////////////////////////////
1429// This static function is called by the vmm_remove_vseg() and vmm_resize_vseg() functions.
1430// Depending on the vseg <type>, it decrements the physical page refcount, and
1431// conditionnally release to the relevant kmem the physical page identified by <ppn>.
1432////////////////////////////////////////////////////////////////////////////////////////////
1433// @ process  : local pointer on process.
1434// @ vseg     : local pointer on vseg.
1435// @ ppn      : released pysical page index.
1436////////////////////////////////////////////////////////////////////////////////////////////
1437static void vmm_ppn_release( process_t * process,
1438                             vseg_t    * vseg,
1439                             ppn_t       ppn )
1440{
1441    bool_t do_release;
1442
1443    // get vseg type
1444    vseg_type_t type = vseg->type;
1445
1446    // compute is_ref
1447    bool_t is_ref = (GET_CXY( process->ref_xp ) == local_cxy);
1448
1449    // get pointers on physical page descriptor
1450    xptr_t   page_xp  = ppm_ppn2page( ppn );
1451    cxy_t    page_cxy = GET_CXY( page_xp );
1452    page_t * page_ptr = GET_PTR( page_xp );
1453
1454    // decrement page refcount
1455    xptr_t count_xp = XPTR( page_cxy , &page_ptr->refcount );
1456    hal_remote_atomic_add( count_xp , -1 );
1457
1458    // compute the do_release condition depending on vseg type
1459    if( (type == VSEG_TYPE_FILE)  ||
1460        (type == VSEG_TYPE_KCODE) || 
1461        (type == VSEG_TYPE_KDATA) || 
1462        (type == VSEG_TYPE_KDEV) )           
1463    {
1464        // no physical page release for FILE and KERNEL
1465        do_release = false;
1466    }
1467    else if( (type == VSEG_TYPE_CODE)  ||
1468             (type == VSEG_TYPE_STACK) ) 
1469    {
1470        // always release physical page for private vsegs
1471        do_release = true;
1472    }
1473    else if( (type == VSEG_TYPE_ANON)  ||
1474             (type == VSEG_TYPE_REMOTE) )
1475    {
1476        // release physical page if reference cluster
1477        do_release = is_ref;
1478    }
1479    else if( is_ref )  // vseg_type == DATA in reference cluster
1480    {
1481        // get extended pointers on forks and lock field in page descriptor
1482        xptr_t forks_xp = XPTR( page_cxy , &page_ptr->forks );
1483        xptr_t lock_xp  = XPTR( page_cxy , &page_ptr->lock );
1484
1485        // take lock protecting "forks" counter
1486        remote_busylock_acquire( lock_xp );
1487
1488        // get number of pending forks from page descriptor
1489        uint32_t forks = hal_remote_l32( forks_xp );
1490
1491        // decrement pending forks counter if required
1492        if( forks )  hal_remote_atomic_add( forks_xp , -1 );
1493
1494        // release lock protecting "forks" counter
1495        remote_busylock_release( lock_xp );
1496
1497        // release physical page if forks == 0
1498        do_release = (forks == 0); 
1499    }
1500    else              // vseg_type == DATA not in reference cluster
1501    {
1502        // no physical page release if not in reference cluster
1503        do_release = false;
1504    }
1505
1506    // release physical page to relevant kmem when required
1507    if( do_release )
1508    {
1509        ppm_remote_free_pages( page_cxy , page_ptr );
1510
1511#if DEBUG_VMM_PPN_RELEASE
1512thread_t * this = CURRENT_THREAD;
1513if( DEBUG_VMM_PPN_RELEASE < cycle )
1514printk("\n[%s] thread[%x,%x] released ppn %x to kmem\n",
1515__FUNCTION__, this->process->pid, this->trdid, ppn );
1516#endif
1517
1518    }
1519} // end vmm_ppn_release()
1520
1521//////////////////////////////////////////
1522void vmm_remove_vseg( process_t * process,
1523                      vseg_t    * vseg )
1524{
1525    uint32_t    vseg_type;  // vseg type
1526    vpn_t       vpn;        // VPN of current PTE
1527    vpn_t       vpn_min;    // VPN of first PTE
1528    vpn_t       vpn_max;    // VPN of last PTE (excluded)
1529    ppn_t       ppn;        // current PTE ppn value
1530    uint32_t    attr;       // current PTE attributes
1531
1532// check arguments
1533assert( (process != NULL), "process argument is NULL" );
1534assert( (vseg    != NULL), "vseg argument is NULL" );
1535
1536    // get pointers on local process VMM
1537    vmm_t * vmm = &process->vmm;
1538
1539    // build extended pointer on GPT
1540    xptr_t gpt_xp = XPTR( local_cxy , &vmm->gpt );
1541
1542    // get relevant vseg infos
1543    vseg_type = vseg->type;
1544    vpn_min   = vseg->vpn_base;
1545    vpn_max   = vpn_min + vseg->vpn_size;
1546
1547#if DEBUG_VMM_REMOVE_VSEG
1548uint32_t   cycle = (uint32_t)hal_get_cycles();
1549thread_t * this  = CURRENT_THREAD;
1550#endif
1551
1552#if (DEBUG_VMM_REMOVE_VSEG & 1 )
1553if( DEBUG_VMM_REMOVE_VSEG < cycle )
1554printk("\n[%s] thread[%x,%x] enter / process %x / %s / base %x / cycle %d\n",
1555__FUNCTION__, this->process->pid, this->trdid, 
1556process->pid, vseg_type_str(vseg->type), vseg->min, cycle );
1557#endif
1558
1559    // loop on PTEs in GPT to unmap all mapped PTE
1560        for( vpn = vpn_min ; vpn < vpn_max ; vpn++ )
1561    {
1562        // get ppn and attr
1563        hal_gpt_get_pte( gpt_xp , vpn , &attr , &ppn );
1564
1565        if( attr & GPT_MAPPED )  // PTE is mapped
1566        { 
1567
1568#if( DEBUG_VMM_REMOVE_VSEG & 1 )
1569if( DEBUG_VMM_REMOVE_VSEG < cycle )
1570printk("\n[%s] thread[%x,%x] unmap vpn %x / ppn %x / %s",
1571__FUNCTION__, this->process->pid, this->trdid, vpn , ppn, vseg_type_str(vseg_type) );
1572#endif
1573            // unmap GPT entry in local GPT
1574            hal_gpt_reset_pte( gpt_xp , vpn );
1575
1576            // release physical page when required
1577            vmm_ppn_release( process , vseg , ppn );
1578        }
1579    }
1580
1581    // remove vseg from VSL
1582    vmm_detach_vseg_from_vsl( vmm , vseg );
1583
1584    // release vseg descriptor depending on vseg type
1585    if( vseg_type == VSEG_TYPE_STACK )
1586    {
1587        // release slot to local stack allocator
1588        vmm_stack_free( vmm , vseg );
1589
1590        // release vseg descriptor to local kmem
1591        vseg_free( vseg );
1592    }
1593    else if( (vseg_type == VSEG_TYPE_ANON) || 
1594             (vseg_type == VSEG_TYPE_FILE) || 
1595             (vseg_type == VSEG_TYPE_REMOTE) ) 
1596    {
1597        // release vseg to local mmap allocator
1598        vmm_mmap_free( vmm , vseg );
1599    }
1600    else
1601    {
1602        // release vseg descriptor to local kmem
1603        vseg_free( vseg );
1604    }
1605
1606#if DEBUG_VMM_REMOVE_VSEG
1607cycle = (uint32_t)hal_get_cycles();
1608if( DEBUG_VMM_REMOVE_VSEG < cycle )
1609printk("[%s] thread[%x,%x] exit / process %x / %s / base %x / cycle %d\n",
1610__FUNCTION__, this->process->pid, this->trdid, 
1611process->pid, vseg_type_str(vseg->type), vseg->min, cycle );
1612#endif
1613
1614}  // end vmm_remove_vseg()
1615
1616/////////////////////////////////////////////
1617void vmm_resize_vseg( process_t * process,
1618                      vseg_t    * vseg,
1619                      intptr_t    new_base,
1620                      intptr_t    new_size )
1621{
1622    vpn_t     vpn;
1623    ppn_t     ppn;
1624    uint32_t  attr;
1625
1626// check arguments
1627assert( (process != NULL), "process argument is NULL" );
1628assert( (vseg    != NULL), "vseg argument is NULL" );
1629
1630#if DEBUG_VMM_RESIZE_VSEG
1631uint32_t   cycle = (uint32_t)hal_get_cycles();
1632thread_t * this  = CURRENT_THREAD;
1633#endif
1634
1635#if (DEBUG_VMM_RESIZE_VSEG & 1)
1636if( DEBUG_VMM_RESIZE_VSEG < cycle )
1637printk("\n[%s] thread[%x,%x] enter / process %x / %s / base %x / cycle %d\n",
1638__FUNCTION__, this->process->pid, this->trdid, 
1639process->pid, vseg_type_str(vseg->type), old_base, cycle );
1640#endif
1641
1642    // get existing vseg vpn_min and vpn_max
1643    vpn_t     old_vpn_min = vseg->vpn_base;
1644    vpn_t     old_vpn_max = old_vpn_min + vseg->vpn_size - 1;
1645
1646    // compute new vseg vpn_min & vpn_max 
1647    intptr_t min          = new_base;
1648    intptr_t max          = new_base + new_size;
1649    vpn_t    new_vpn_min  = min >> CONFIG_PPM_PAGE_SHIFT;
1650    vpn_t    new_vpn_max  = (max - 1) >> CONFIG_PPM_PAGE_SHIFT;
1651
1652    // build extended pointer on GPT
1653    xptr_t gpt_xp = XPTR( local_cxy , &process->vmm.gpt );
1654
1655    // loop on PTEs in GPT to unmap PTE if (oldd_vpn_min <= vpn < new_vpn_min)
1656        for( vpn = old_vpn_min ; vpn < new_vpn_min ; vpn++ )
1657    {
1658        // get ppn and attr
1659        hal_gpt_get_pte( gpt_xp , vpn , &attr , &ppn );
1660
1661        if( attr & GPT_MAPPED )  // PTE is mapped
1662        { 
1663
1664#if( DEBUG_VMM_RESIZE_VSEG & 1 )
1665if( DEBUG_VMM_RESIZE_VSEG < cycle )
1666printk("\n[%s] thread[%x,%x] unmap vpn %x / ppn %x / %s",
1667__FUNCTION__, this->process->pid, this->trdid, vpn , ppn, vseg_type_str(vseg_type) );
1668#endif
1669            // unmap GPT entry
1670            hal_gpt_reset_pte( gpt_xp , vpn );
1671
1672            // release physical page when required
1673            vmm_ppn_release( process , vseg , ppn );
1674        }
1675    }
1676
1677    // loop on PTEs in GPT to unmap PTE if (new vpn_max <= vpn < old_vpn_max)
1678        for( vpn = new_vpn_max ; vpn < old_vpn_max ; vpn++ )
1679    {
1680        // get ppn and attr
1681        hal_gpt_get_pte( gpt_xp , vpn , &attr , &ppn );
1682
1683        if( attr & GPT_MAPPED )  // PTE is mapped
1684        { 
1685
1686#if( DEBUG_VMM_REMOVE_VSEG & 1 )
1687if( DEBUG_VMM_RESIZE_VSEG < cycle )
1688printk("\n[%s] thread[%x,%x] unmap vpn %x / ppn %x / %s",
1689__FUNCTION__, this->process->pid, this->trdid, vpn , ppn, vseg_type_str(vseg_type) );
1690#endif
1691            // unmap GPT entry in local GPT
1692            hal_gpt_reset_pte( gpt_xp , vpn );
1693
1694            // release physical page when required
1695            vmm_ppn_release( process , vseg , ppn );
1696        }
1697    }
1698
1699    // resize vseg in VSL
1700    vseg->min      = min;
1701    vseg->max      = max;
1702    vseg->vpn_base = new_vpn_min;
1703    vseg->vpn_size = new_vpn_max - new_vpn_min + 1;
1704
1705#if DEBUG_VMM_RESIZE_VSEG
1706cycle = (uint32_t)hal_get_cycles();
1707if( DEBUG_VMM_RESIZE_VSEG < cycle )
1708printk("[%s] thread[%x,%x] exit / process %x / %s / base %x / cycle %d\n",
1709__FUNCTION__, this->process->pid, this->trdid, 
1710process->pid, vseg_type_str(vseg->type), vseg->min, cycle );
1711#endif
1712
1713}  // end vmm_resize_vseg
1714
1715/////////////////////////////////////////////////////////////////////////////////////////////
1716// This static function is called twice by the vmm_get_vseg() function.
1717// It scan the - possibly remote - VSL defined by the <vmm_xp> argument to find the vseg
1718// containing a given virtual address <vaddr>. It uses remote accesses to access the remote
1719// VSL if required. The VSL lock protecting the VSL must be taken by the caller.
1720/////////////////////////////////////////////////////////////////////////////////////////////
1721// @ vmm_xp  : extended pointer on the process VMM.
1722// @ vaddr   : virtual address.
1723// @ return local pointer on remote vseg if success / return NULL if not found.
1724/////////////////////////////////////////////////////////////////////////////////////////////
1725static vseg_t * vmm_vseg_from_vaddr( xptr_t     vmm_xp,
1726                                     intptr_t   vaddr )
1727{
1728    xptr_t   iter_xp;
1729    xptr_t   vseg_xp;
1730    vseg_t * vseg;
1731    intptr_t min;
1732    intptr_t max;
1733
1734    // get cluster and local pointer on target VMM
1735    vmm_t * vmm_ptr = GET_PTR( vmm_xp );
1736    cxy_t   vmm_cxy = GET_CXY( vmm_xp );
1737
1738    // build extended pointer on VSL root
1739    xptr_t root_xp = XPTR( vmm_cxy , &vmm_ptr->vsegs_root );
1740
1741    // scan the list of vsegs in VSL
1742    XLIST_FOREACH( root_xp , iter_xp )
1743    {
1744        vseg_xp = XLIST_ELEMENT( iter_xp , vseg_t , xlist );
1745        vseg    = GET_PTR( vseg_xp );
1746
1747        min = hal_remote_l32( XPTR( vmm_cxy , &vseg->min ) );
1748        max = hal_remote_l32( XPTR( vmm_cxy , &vseg->max ) );
1749
1750        // return success when match
1751        if( (vaddr >= min) && (vaddr < max) ) return vseg;
1752    }
1753
1754    // return failure
1755    return NULL;
1756
1757}  // end vmm_vseg_from_vaddr()
1758
1759///////////////////////////////////////////
1760error_t  vmm_get_vseg( process_t * process,
1761                       intptr_t    vaddr,
1762                       vseg_t   ** found_vseg )
1763{
1764    xptr_t    loc_lock_xp;     // extended pointer on local VSL lock
1765    xptr_t    ref_lock_xp;     // extended pointer on reference VSL lock
1766    vseg_t  * loc_vseg;        // local pointer on local vseg
1767    vseg_t  * ref_vseg;        // local pointer on reference vseg
1768
1769    // build extended pointer on local VSL lock
1770    loc_lock_xp = XPTR( local_cxy , &process->vmm.vsl_lock );
1771     
1772    // get local VSL lock
1773    remote_queuelock_acquire( loc_lock_xp );
1774
1775    // try to get vseg from local VMM
1776    loc_vseg = vmm_vseg_from_vaddr( XPTR( local_cxy, &process->vmm ) , vaddr );
1777
1778    if (loc_vseg == NULL)   // vseg not found => access reference VSL
1779    {
1780        // get extended pointer on reference process
1781        xptr_t ref_xp = process->ref_xp;
1782
1783        // get cluster and local pointer on reference process
1784        cxy_t       ref_cxy = GET_CXY( ref_xp );
1785        process_t * ref_ptr = GET_PTR( ref_xp );
1786
1787        // build extended pointer on reference VSL lock
1788        ref_lock_xp = XPTR( ref_cxy , &ref_ptr->vmm.vsl_lock );
1789     
1790        // get reference VSL lock
1791        remote_queuelock_acquire( ref_lock_xp );
1792
1793        // try to get vseg from reference VMM
1794        ref_vseg = vmm_vseg_from_vaddr( XPTR( ref_cxy , &ref_ptr->vmm ) , vaddr );
1795
1796        if( ref_vseg == NULL )  // vseg not found => return error
1797        {
1798            printk("\n[ERROR] in %s : vaddr %x in process %x out of segment\n",
1799            __FUNCTION__, vaddr, process->pid );
1800
1801            // release reference VSL lock
1802            remote_queuelock_release( ref_lock_xp );
1803
1804            return -1;
1805        }
1806        else                    // vseg found => try to update local VSL
1807        {
1808            // allocate a local vseg descriptor
1809            loc_vseg = vseg_alloc();
1810
1811            if( loc_vseg == NULL )   // no memory => return error
1812            {
1813                printk("\n[ERROR] in %s : vaddr %x in process %x / no memory for local vseg\n",
1814                __FUNCTION__, vaddr, process->pid );
1815
1816                // release reference VSL & local VSL locks
1817                remote_queuelock_release( ref_lock_xp );
1818                remote_queuelock_release( loc_lock_xp );
1819
1820                return -1;
1821            }
1822            else                     // update local VSL and return success
1823            {
1824                // initialize local vseg
1825                vseg_init_from_ref( loc_vseg , XPTR( ref_cxy , ref_vseg ) );
1826
1827                // register local vseg in local VSL
1828                vmm_attach_vseg_to_vsl( &process->vmm , loc_vseg );
1829
1830                // release reference VSL & local VSL locks
1831                remote_queuelock_release( ref_lock_xp );
1832                remote_queuelock_release( loc_lock_xp );
1833
1834                *found_vseg = loc_vseg;
1835                return 0;
1836            }
1837        }
1838    }
1839    else                        // vseg found in local VSL => return success
1840    {
1841        // release local VSL lock
1842        remote_queuelock_release( loc_lock_xp );
1843
1844        *found_vseg = loc_vseg;
1845        return 0;
1846    }
1847}  // end vmm_get_vseg()
1848
1849//////////////////////////////////////////////////////////////////////////////////////
1850// This static function compute the target cluster to allocate a physical page
1851// for a given <vpn> in a given <vseg>, allocates the page and returns an extended
1852// pointer on the allocated page descriptor.
1853// The vseg cannot have the FILE type.
1854//////////////////////////////////////////////////////////////////////////////////////
1855// @ vseg   : local pointer on vseg.
1856// @ vpn    : unmapped vpn.
1857// @ return an extended pointer on the allocated page
1858//////////////////////////////////////////////////////////////////////////////////////
1859static xptr_t vmm_page_allocate( vseg_t * vseg,
1860                                 vpn_t    vpn )
1861{
1862
1863#if DEBUG_VMM_PAGE_ALLOCATE
1864uint32_t   cycle   = (uint32_t)hal_get_cycles();
1865thread_t * this    = CURRENT_THREAD;
1866if( DEBUG_VMM_PAGE_ALLOCATE < cycle )
1867printk("\n[%s] thread[%x,%x] enter for vpn %x / cycle %d\n",
1868__FUNCTION__ , this->process->pid, this->trdid, vpn, cycle );
1869#endif
1870
1871    xptr_t       page_xp;
1872    cxy_t        page_cxy;
1873    page_t     * page_ptr;
1874    uint32_t     index;
1875
1876    uint32_t     type   = vseg->type;
1877    uint32_t     flags  = vseg->flags;
1878    uint32_t     x_size = LOCAL_CLUSTER->x_size;
1879    uint32_t     y_size = LOCAL_CLUSTER->y_size;
1880
1881// check vseg type
1882assert( ( type != VSEG_TYPE_FILE ) , "illegal vseg type\n" );
1883
1884    if( flags & VSEG_DISTRIB )    // distributed => cxy depends on vpn LSB
1885    {
1886        index    = vpn & ((x_size * y_size) - 1);
1887        page_cxy = HAL_CXY_FROM_XY( (index / y_size) , (index % y_size) );
1888
1889        // If the cluster selected from VPN's LSBs is empty, we select one randomly
1890        if ( cluster_is_active( page_cxy ) == false )
1891        {
1892            page_cxy = cluster_random_select();
1893        }
1894    }
1895    else                          // other cases => cxy specified in vseg
1896    {
1897        page_cxy = vseg->cxy;
1898    }
1899
1900    // allocate one small physical page from target cluster
1901    page_ptr = ppm_remote_alloc_pages( page_cxy , 0 );
1902
1903    page_xp = XPTR( page_cxy , page_ptr );
1904
1905#if DEBUG_VMM_PAGE_ALLOCATE
1906cycle = (uint32_t)hal_get_cycles();
1907if( DEBUG_VMM_PAGE_ALLOCATE < cycle )
1908printk("\n[%s] thread[%x,%x] exit for vpn %x / ppn %x / cycle %d\n",
1909__FUNCTION__ , this->process->pid, this->trdid, vpn, ppm_page2ppn(page_xp), cycle );
1910#endif
1911
1912    return page_xp;
1913
1914}  // end vmm_page_allocate() 
1915
1916////////////////////////////////////////
1917error_t vmm_get_one_ppn( vseg_t * vseg,
1918                         vpn_t    vpn,
1919                         ppn_t  * ppn )
1920{
1921    error_t    error;
1922    xptr_t     page_xp;           // extended pointer on physical page descriptor
1923    uint32_t   page_id;           // missing page index in vseg mapper
1924    uint32_t   type;              // vseg type;
1925
1926    type      = vseg->type;
1927    page_id   = vpn - vseg->vpn_base;
1928
1929#if DEBUG_VMM_GET_ONE_PPN
1930uint32_t   cycle = (uint32_t)hal_get_cycles();
1931thread_t * this  = CURRENT_THREAD;
1932if( (DEBUG_VMM_GET_ONE_PPN < cycle) && (vpn == 0x40b) )
1933printk("\n[%s] thread[%x,%x] enter for vpn %x / type %s / page_id  %d / cycle %d\n",
1934__FUNCTION__, this->process->pid, this->trdid, vpn, vseg_type_str(type), page_id, cycle );
1935#endif
1936
1937    // FILE type : get the physical page from the file mapper
1938    if( type == VSEG_TYPE_FILE )
1939    {
1940        // get extended pointer on mapper
1941        xptr_t mapper_xp = vseg->mapper_xp;
1942
1943assert( (mapper_xp != XPTR_NULL),
1944"mapper not defined for a FILE vseg\n" );
1945       
1946        // get extended pointer on page descriptor
1947        page_xp = mapper_remote_get_page( mapper_xp , page_id );
1948
1949        if ( page_xp == XPTR_NULL ) return EINVAL;
1950    }
1951
1952    // Other types : allocate a physical page from target cluster,
1953    // as defined by vseg type and vpn value
1954    else
1955    {
1956        // allocate one physical page
1957        page_xp = vmm_page_allocate( vseg , vpn );
1958
1959        if( page_xp == XPTR_NULL ) return -1;
1960
1961        // initialise missing page from .elf file mapper for DATA and CODE types
1962        // the vseg->mapper_xp field is an extended pointer on the .elf file mapper
1963        if( (type == VSEG_TYPE_CODE) || (type == VSEG_TYPE_DATA) )
1964        {
1965            // get extended pointer on mapper
1966            xptr_t     mapper_xp = vseg->mapper_xp;
1967
1968assert( (mapper_xp != XPTR_NULL),
1969"mapper not defined for a CODE or DATA vseg\n" );
1970       
1971            // compute missing page offset in vseg
1972            uint32_t offset = page_id << CONFIG_PPM_PAGE_SHIFT;
1973
1974            // compute missing page offset in .elf file
1975            uint32_t elf_offset = vseg->file_offset + offset;
1976
1977#if (DEBUG_VMM_GET_ONE_PPN & 0x1)
1978if( (DEBUG_VMM_GET_ONE_PPN < cycle) && (vpn == 0x40b) )
1979printk("\n[%s] thread[%x,%x] for vpn = %x / elf_offset = %x\n",
1980__FUNCTION__, this->process->pid, this->trdid, vpn, elf_offset );
1981#endif
1982            // compute extended pointer on page base
1983            xptr_t base_xp  = ppm_page2base( page_xp );
1984
1985            // file_size (in .elf mapper) can be smaller than vseg_size (BSS)
1986            uint32_t file_size = vseg->file_size;
1987
1988            if( file_size < offset )                 // missing page fully in  BSS
1989            {
1990
1991#if (DEBUG_VMM_GET_ONE_PPN & 0x1)
1992if( (DEBUG_VMM_GET_ONE_PPN < cycle) && (vpn == 0x40b) )
1993printk("\n[%s] thread[%x,%x] for vpn  %x / fully in BSS\n",
1994__FUNCTION__, this->process->pid, this->trdid, vpn );
1995#endif
1996                if( GET_CXY( page_xp ) == local_cxy )
1997                {
1998                    memset( GET_PTR( base_xp ) , 0 , CONFIG_PPM_PAGE_SIZE );
1999                }
2000                else
2001                {
2002                   hal_remote_memset( base_xp , 0 , CONFIG_PPM_PAGE_SIZE );       
2003                }
2004            }
2005            else if( file_size >= (offset + CONFIG_PPM_PAGE_SIZE) )  // fully in  mapper
2006            {
2007
2008#if (DEBUG_VMM_GET_ONE_PPN & 0x1)
2009if( (DEBUG_VMM_GET_ONE_PPN < cycle) && (vpn == 0x40b) )
2010printk("\n[%s] thread[%x,%x] for vpn  %x / fully in mapper\n",
2011__FUNCTION__, this->process->pid, this->trdid, vpn );
2012#endif
2013                error = mapper_move_kernel( mapper_xp,
2014                                            true,             // to_buffer
2015                                            elf_offset,
2016                                            base_xp,
2017                                            CONFIG_PPM_PAGE_SIZE ); 
2018                if( error ) return EINVAL;
2019            }
2020            else  // both in mapper and in BSS :
2021                  // - (file_size - offset)             bytes from mapper
2022                  // - (page_size + offset - file_size) bytes from BSS
2023            {
2024
2025#if (DEBUG_VMM_GET_ONE_PPN & 0x1)
2026if( (DEBUG_VMM_GET_ONE_PPN < cycle) && (vpn == 0x40b) )
2027printk("\n[%s] thread[%x,%x] for vpn  %x / both mapper & BSS\n"
2028"      %d bytes from mapper / %d bytes from BSS\n",
2029__FUNCTION__, this->process->pid, this->trdid, vpn,
2030file_size - offset , offset + CONFIG_PPM_PAGE_SIZE - file_size  );
2031#endif
2032                // initialize mapper part
2033                error = mapper_move_kernel( mapper_xp,
2034                                            true,         // to buffer
2035                                            elf_offset,
2036                                            base_xp,
2037                                            file_size - offset ); 
2038                if( error ) return EINVAL;
2039
2040                // initialize BSS part
2041                if( GET_CXY( page_xp ) == local_cxy )
2042                {
2043                    memset( GET_PTR( base_xp ) + file_size - offset , 0 , 
2044                            offset + CONFIG_PPM_PAGE_SIZE - file_size );
2045                }
2046                else
2047                {
2048                   hal_remote_memset( base_xp + file_size - offset , 0 , 
2049                                      offset + CONFIG_PPM_PAGE_SIZE - file_size );
2050                }
2051            }   
2052        }  // end initialisation for CODE or DATA types   
2053    } 
2054
2055    // return ppn
2056    *ppn = ppm_page2ppn( page_xp );
2057
2058#if DEBUG_VMM_GET_ONE_PPN
2059cycle = (uint32_t)hal_get_cycles();
2060if( (DEBUG_VMM_GET_ONE_PPN < cycle) && (vpn == 0x40b) )
2061printk("\n[%s] thread[%x,%x] exit for vpn %x / ppn %x / cycle %d\n",
2062__FUNCTION__ , this->process->pid, this->trdid , vpn , *ppn, cycle );
2063#endif
2064
2065    return 0;
2066
2067}  // end vmm_get_one_ppn()
2068
2069///////////////////////////////////////////////////
2070error_t vmm_handle_page_fault( process_t * process,
2071                               vpn_t       vpn )
2072{
2073    vseg_t         * vseg;            // vseg containing vpn
2074    uint32_t         attr;            // PTE_ATTR value
2075    ppn_t            ppn;             // PTE_PPN value
2076    uint32_t         ref_attr;        // PTE_ATTR value in reference GPT
2077    ppn_t            ref_ppn;         // PTE_PPN value in reference GPT
2078    cxy_t            ref_cxy;         // reference cluster for missing vpn
2079    process_t      * ref_ptr;         // reference process for missing vpn
2080    xptr_t           local_gpt_xp;    // extended pointer on local GPT
2081    xptr_t           ref_gpt_xp;      // extended pointer on reference GPT
2082    error_t          error;           // value returned by called functions
2083
2084    thread_t * this  = CURRENT_THREAD;
2085
2086#if (CONFIG_INSTRUMENTATION_PGFAULTS || DEBUG_VMM_HANDLE_PAGE_FAULT)
2087uint32_t start_cycle = (uint32_t)hal_get_cycles();
2088#endif
2089
2090#if DEBUG_VMM_HANDLE_PAGE_FAULT
2091if( (start_cycle > DEBUG_VMM_HANDLE_PAGE_FAULT) && (vpn > 0) )
2092printk("\n[%s] thread[%x,%x] enter for vpn %x / cycle %d\n",
2093__FUNCTION__, this->process->pid, this->trdid, vpn, start_cycle );
2094#endif
2095
2096#if (DEBUG_VMM_HANDLE_PAGE_FAULT & 1)
2097if( (start_cycle > DEBUG_VMM_HANDLE_PAGE_FAULT) && (vpn > 0) )
2098hal_vmm_display( this->process , true );
2099#endif
2100
2101    // get local vseg (access to reference VSL can be required)
2102    error = vmm_get_vseg( process, 
2103                          (intptr_t)vpn<<CONFIG_PPM_PAGE_SHIFT,
2104                          &vseg );
2105    if( error )
2106    {
2107        printk("\n[ERROR] in %s : vpn %x in thread[%x,%x] not in registered vseg\n",
2108        __FUNCTION__ , vpn , process->pid, this->trdid );
2109       
2110        return EXCP_USER_ERROR;
2111    }
2112
2113#if (DEBUG_VMM_HANDLE_PAGE_FAULT & 1)
2114if( (start_cycle > DEBUG_VMM_HANDLE_PAGE_FAULT) && (vpn > 0) )
2115printk("\n[%s] thread[%x,%x] found vseg %s\n",
2116__FUNCTION__, this->process->pid, this->trdid, vseg_type_str(vseg->type) );
2117#endif
2118
2119    // build extended pointer on local GPT
2120    local_gpt_xp  = XPTR( local_cxy , &process->vmm.gpt );
2121
2122    // lock PTE in local GPT and get current PPN and attributes
2123    error = hal_gpt_lock_pte( local_gpt_xp,
2124                              vpn,
2125                              &attr,
2126                              &ppn );
2127    if( error )
2128    {
2129        printk("\n[PANIC] in %s : cannot lock PTE in local GPT / vpn %x / process %x\n",
2130        __FUNCTION__ , vpn , process->pid );
2131       
2132        return EXCP_KERNEL_PANIC;
2133    }
2134
2135#if (DEBUG_VMM_HANDLE_PAGE_FAULT & 1)
2136if( (start_cycle > DEBUG_VMM_HANDLE_PAGE_FAULT) && (vpn > 0) )
2137printk("\n[%s] thread[%x,%x] locked vpn %x in cluster %x\n",
2138__FUNCTION__, this->process->pid, this->trdid, vpn, local_cxy );
2139#endif
2140
2141    // handle page fault only if local PTE still unmapped after lock
2142    if( (attr & GPT_MAPPED) == 0 )
2143    {
2144        // get reference process cluster and local pointer
2145        ref_cxy = GET_CXY( process->ref_xp );
2146        ref_ptr = GET_PTR( process->ref_xp );
2147
2148        /////////////// private vseg or (local == reference)
2149        /////////////// => access only the local GPT
2150        if( (vseg->type == VSEG_TYPE_STACK) ||
2151            (vseg->type == VSEG_TYPE_CODE)  ||
2152            (ref_cxy    == local_cxy ) )
2153        {
2154
2155#if (DEBUG_VMM_HANDLE_PAGE_FAULT & 1)
2156if( (start_cycle > DEBUG_VMM_HANDLE_PAGE_FAULT) && (vpn > 0) )
2157printk("\n[%s] thread[%x,%x] access local gpt : cxy %x / ref_cxy %x / type %s / cycle %d\n",
2158__FUNCTION__, this->process->pid, this->trdid,
2159local_cxy, ref_cxy, vseg_type_str(vseg->type), (uint32_t)hal_get_cycles() );
2160#endif
2161            // allocate and initialise a physical page
2162            error = vmm_get_one_ppn( vseg , vpn , &ppn );
2163
2164            if( error )
2165            {
2166                printk("\n[ERROR] in %s : no physical page / process = %x / vpn = %x\n",
2167                __FUNCTION__ , process->pid , vpn );
2168
2169                // unlock PTE in local GPT
2170                hal_gpt_unlock_pte( local_gpt_xp , vpn );
2171
2172                return EXCP_KERNEL_PANIC;
2173            }
2174
2175            // define attr from vseg flags
2176            attr = GPT_MAPPED | GPT_SMALL | GPT_READABLE;
2177            if( vseg->flags & VSEG_USER  ) attr |= GPT_USER;
2178            if( vseg->flags & VSEG_WRITE ) attr |= GPT_WRITABLE;
2179            if( vseg->flags & VSEG_EXEC  ) attr |= GPT_EXECUTABLE;
2180            if( vseg->flags & VSEG_CACHE ) attr |= GPT_CACHABLE;
2181
2182            // set PTE to local GPT
2183            // it unlocks this PTE
2184            hal_gpt_set_pte( local_gpt_xp,
2185                             vpn,
2186                             attr,
2187                             ppn );
2188
2189#if (CONFIG_INSTRUMENTATION_PGFAULTS || DEBUG_VMM_HANDLE_PAGE_FAULT)
2190uint32_t end_cycle = (uint32_t)hal_get_cycles();
2191#endif
2192
2193#if DEBUG_VMM_HANDLE_PAGE_FAULT
2194if( (end_cycle > DEBUG_VMM_HANDLE_PAGE_FAULT) && (vpn > 0) )
2195printk("\n[%s] thread[%x,%x] handled local pgfault / ppn %x / attr %x / cycle %d\n",
2196__FUNCTION__, this->process->pid, this->trdid, ppn, attr, end_cycle );
2197#endif
2198
2199#if CONFIG_INSTRUMENTATION_PGFAULTS
2200this->info.local_pgfault_nr++;
2201this->info.local_pgfault_cost += (end_cycle - start_cycle);
2202#endif
2203            return EXCP_NON_FATAL;
2204
2205        }   // end local GPT access
2206
2207        /////////////////// public vseg and (local != reference)
2208        /////////////////// => access ref GPT to update local GPT
2209        else                               
2210        {
2211
2212#if (DEBUG_VMM_HANDLE_PAGE_FAULT & 1)
2213if( (start_cycle > DEBUG_VMM_HANDLE_PAGE_FAULT) && (vpn > 0) )
2214printk("\n[%s] thread[%x,%x] access ref gpt : cxy %x / ref_cxy %x / type %s / cycle %d\n",
2215__FUNCTION__, this->process->pid, this->trdid, 
2216local_cxy, ref_cxy, vseg_type_str(vseg->type), (uint32_t)hal_get_cycles() );
2217#endif
2218            // build extended pointer on reference GPT
2219            ref_gpt_xp = XPTR( ref_cxy , &ref_ptr->vmm.gpt );
2220
2221            // lock PTE in reference GPT and get current PPN and attributes
2222            error = hal_gpt_lock_pte( ref_gpt_xp,
2223                                      vpn,
2224                                      &ref_attr,
2225                                      &ref_ppn );
2226            if( error )
2227            {
2228                printk("\n[PANIC] in %s : cannot lock PTE in ref GPT / vpn %x / process %x\n",
2229                __FUNCTION__ , vpn , process->pid );
2230       
2231                // unlock PTE in local GPT
2232                hal_gpt_unlock_pte( local_gpt_xp , vpn );
2233                   
2234                return EXCP_KERNEL_PANIC;
2235            }
2236
2237#if (DEBUG_VMM_HANDLE_PAGE_FAULT & 1)
2238if( (start_cycle > DEBUG_VMM_HANDLE_PAGE_FAULT) && (vpn > 0) )
2239printk("\n[%s] thread[%x,%x] get pte from ref gpt / attr %x / ppn %x\n",
2240__FUNCTION__, this->process->pid, this->trdid, ref_attr, ref_ppn );
2241#endif
2242
2243            if( ref_attr & GPT_MAPPED )        // false page fault
2244            {
2245                // update local GPT from reference GPT values
2246                // this unlocks the PTE in local GPT
2247                hal_gpt_set_pte( local_gpt_xp,
2248                                 vpn,
2249                                 ref_attr,
2250                                 ref_ppn );
2251
2252#if (DEBUG_VMM_HANDLE_PAGE_FAULT & 1)
2253if( (start_cycle > DEBUG_VMM_HANDLE_PAGE_FAULT) && (vpn > 0) )
2254printk("\n[%s] thread[%x,%x] updated local gpt for a false pgfault\n",
2255__FUNCTION__, this->process->pid, this->trdid );
2256#endif
2257
2258                // unlock the PTE in reference GPT
2259                hal_gpt_unlock_pte( ref_gpt_xp, vpn );
2260                             
2261#if (DEBUG_VMM_HANDLE_PAGE_FAULT &1)
2262if( (start_cycle > DEBUG_VMM_HANDLE_PAGE_FAULT) && (vpn > 0) )
2263printk("\n[%s] thread[%x,%x] unlock the ref gpt after a false pgfault\n",
2264__FUNCTION__, this->process->pid, this->trdid );
2265#endif
2266
2267#if (CONFIG_INSTRUMENTATION_PGFAULTS || DEBUG_VMM_HANDLE_PAGE_FAULT)
2268uint32_t end_cycle = (uint32_t)hal_get_cycles();
2269#endif
2270
2271#if DEBUG_VMM_HANDLE_PAGE_FAULT
2272if( (end_cycle > DEBUG_VMM_HANDLE_PAGE_FAULT) && (vpn > 0) )
2273printk("\n[%s] thread[%x,%x] handled false pgfault / ppn %x / attr %x / cycle %d\n",
2274__FUNCTION__, this->process->pid, this->trdid, ref_ppn, ref_attr, end_cycle );
2275#endif
2276
2277#if CONFIG_INSTRUMENTATION_PGFAULTS
2278this->info.false_pgfault_nr++;
2279this->info.false_pgfault_cost += (end_cycle - start_cycle);
2280#endif
2281                return EXCP_NON_FATAL;
2282            }
2283            else                            // true page fault
2284            {
2285                // allocate and initialise a physical page depending on the vseg type
2286                error = vmm_get_one_ppn( vseg , vpn , &ppn );
2287
2288                if( error )
2289                {
2290                    printk("\n[ERROR] in %s : no memory / process = %x / vpn = %x\n",
2291                    __FUNCTION__ , process->pid , vpn );
2292
2293                    // unlock PTE in local GPT and in reference GPT
2294                    hal_gpt_unlock_pte( local_gpt_xp , vpn );
2295                    hal_gpt_unlock_pte( ref_gpt_xp   , vpn );
2296                   
2297                    return EXCP_KERNEL_PANIC;
2298                }
2299
2300                // define attr from vseg flags
2301                attr = GPT_MAPPED | GPT_SMALL | GPT_READABLE;
2302                if( vseg->flags & VSEG_USER  ) attr |= GPT_USER;
2303                if( vseg->flags & VSEG_WRITE ) attr |= GPT_WRITABLE;
2304                if( vseg->flags & VSEG_EXEC  ) attr |= GPT_EXECUTABLE;
2305                if( vseg->flags & VSEG_CACHE ) attr |= GPT_CACHABLE;
2306
2307#if (DEBUG_VMM_HANDLE_PAGE_FAULT & 1)
2308if( (start_cycle > DEBUG_VMM_HANDLE_PAGE_FAULT) && (vpn > 0) )
2309printk("\n[%s] thread[%x,%x] build a new PTE for a true pgfault\n",
2310__FUNCTION__, this->process->pid, this->trdid );
2311#endif
2312                // set PTE in reference GPT
2313                // this unlock the PTE
2314                hal_gpt_set_pte( ref_gpt_xp,
2315                                 vpn,
2316                                 attr,
2317                                 ppn );
2318
2319#if (DEBUG_VMM_HANDLE_PAGE_FAULT & 1)
2320if( (start_cycle > DEBUG_VMM_HANDLE_PAGE_FAULT) && (vpn > 0) )
2321printk("\n[%s] thread[%x,%x] set new PTE in ref gpt for a true page fault\n",
2322__FUNCTION__, this->process->pid, this->trdid );
2323#endif
2324
2325                // set PTE in local GPT
2326                // this unlock the PTE
2327                hal_gpt_set_pte( local_gpt_xp,
2328                                 vpn,
2329                                 attr,
2330                                 ppn );
2331
2332#if (CONFIG_INSTRUMENTATION_PGFAULTS || DEBUG_VMM_HANDLE_PAGE_FAULT)
2333uint32_t end_cycle = (uint32_t)hal_get_cycles();
2334#endif
2335
2336#if DEBUG_VMM_HANDLE_PAGE_FAULT
2337if( (end_cycle > DEBUG_VMM_HANDLE_PAGE_FAULT) && (vpn > 0) )
2338printk("\n[%s] thread[%x,%x] handled global pgfault / ppn %x / attr %x / cycle %d\n",
2339__FUNCTION__, this->process->pid, this->trdid, ppn, attr, end_cycle );
2340#endif
2341
2342#if CONFIG_INSTRUMENTATION_PGFAULTS
2343this->info.global_pgfault_nr++;
2344this->info.global_pgfault_cost += (end_cycle - start_cycle);
2345#endif
2346                return EXCP_NON_FATAL;
2347            }
2348        }
2349    }
2350    else   // page has been locally mapped by another concurrent thread
2351    {
2352        // unlock the PTE in local GPT
2353        hal_gpt_unlock_pte( local_gpt_xp , vpn );
2354
2355#if (CONFIG_INSTRUMENTATION_PGFAULTS || DEBUG_VMM_HANDLE_PAGE_FAULT)
2356uint32_t end_cycle = (uint32_t)hal_get_cycles();
2357#endif
2358
2359#if DEBUG_VMM_HANDLE_PAGE_FAULT
2360if( (end_cycle > DEBUG_VMM_HANDLE_PAGE_FAULT) && (vpn > 0) )
2361printk("\n[%s] handled by another thread / vpn %x / ppn %x / attr %x / cycle %d\n",
2362__FUNCTION__, vpn, ppn, attr, end_cycle );
2363#endif
2364
2365#if CONFIG_INSTRUMENTATION_PGFAULTS
2366this->info.false_pgfault_nr++;
2367this->info.false_pgfault_cost += (end_cycle - start_cycle);
2368#endif
2369        return EXCP_NON_FATAL;
2370    }
2371
2372}   // end vmm_handle_page_fault()
2373
2374////////////////////////////////////////////
2375error_t vmm_handle_cow( process_t * process,
2376                        vpn_t       vpn )
2377{
2378    vseg_t         * vseg;            // vseg containing vpn
2379    xptr_t           gpt_xp;          // extended pointer on GPT (local or reference)
2380    gpt_t          * gpt_ptr;         // local pointer on GPT (local or reference)
2381    cxy_t            gpt_cxy;         // GPT cluster identifier
2382    uint32_t         old_attr;        // current PTE_ATTR value
2383    ppn_t            old_ppn;         // current PTE_PPN value
2384    uint32_t         new_attr;        // new PTE_ATTR value
2385    ppn_t            new_ppn;         // new PTE_PPN value
2386    cxy_t            ref_cxy;         // reference process cluster
2387    process_t      * ref_ptr;         // local pointer on reference process
2388    error_t          error;
2389
2390    thread_t * this  = CURRENT_THREAD;
2391
2392#if DEBUG_VMM_HANDLE_COW
2393uint32_t   cycle = (uint32_t)hal_get_cycles();
2394if( (DEBUG_VMM_HANDLE_COW < cycle) && (vpn > 0) )
2395printk("\n[%s] thread[%x,%x] enter for vpn %x / core[%x,%d] / cycle %d\n",
2396__FUNCTION__, this->process->pid, this->trdid, vpn, local_cxy, this->core->lid, cycle );
2397#endif
2398
2399#if ((DEBUG_VMM_HANDLE_COW & 3) == 3 )
2400hal_vmm_display( XPTR( local_cxy , process ) , true );
2401#endif
2402
2403    // get local vseg
2404    error = vmm_get_vseg( process, 
2405                          (intptr_t)vpn<<CONFIG_PPM_PAGE_SHIFT,
2406                          &vseg );
2407    if( error )
2408    {
2409        printk("\n[ERROR] in %s : vpn %x in thread[%x,%x] not in a registered vseg\n",
2410        __FUNCTION__, vpn, process->pid, this->trdid );
2411
2412        return EXCP_USER_ERROR;
2413    }
2414
2415#if DEBUG_VMM_HANDLE_COW
2416if( (DEBUG_VMM_HANDLE_COW < cycle) && (vpn > 0) )
2417printk("\n[%s] thread[%x,%x] get vseg %s\n",
2418__FUNCTION__, this->process->pid, this->trdid, vseg_type_str(vseg->type) );
2419#endif
2420
2421    // get reference process cluster and local pointer
2422    ref_cxy = GET_CXY( process->ref_xp );
2423    ref_ptr = GET_PTR( process->ref_xp );
2424
2425    // build pointers on relevant GPT
2426    // - access only local GPT for a private vseg 
2427    // - access reference GPT and all copies for a public vseg
2428    if( (vseg->type == VSEG_TYPE_STACK) || (vseg->type == VSEG_TYPE_CODE) )
2429    {
2430        gpt_cxy = local_cxy;
2431        gpt_ptr = &process->vmm.gpt;
2432        gpt_xp  = XPTR( gpt_cxy , gpt_ptr );
2433    }
2434    else
2435    {
2436        gpt_cxy = ref_cxy;
2437        gpt_ptr = &ref_ptr->vmm.gpt;
2438        gpt_xp  = XPTR( gpt_cxy , gpt_ptr );
2439    }
2440
2441    // lock target PTE in relevant GPT (local or reference)
2442    // and get current PTE value
2443    error = hal_gpt_lock_pte( gpt_xp,
2444                              vpn,
2445                              &old_attr,
2446                              &old_ppn );
2447    if( error )
2448    {
2449        printk("\n[PANIC] in %s : cannot lock PTE in GPT / cxy %x / vpn %x / process %x\n",
2450        __FUNCTION__ , gpt_cxy, vpn , process->pid );
2451       
2452        return EXCP_KERNEL_PANIC;
2453    }
2454
2455#if DEBUG_VMM_HANDLE_COW
2456if( (DEBUG_VMM_HANDLE_COW < cycle) && (vpn > 0) )
2457printk("\n[%s] thread[%x,%x] get pte for vpn %x : ppn %x / attr %x\n",
2458__FUNCTION__, this->process->pid, this->trdid, vpn, old_ppn, old_attr );
2459#endif
2460
2461    // return user error if COW attribute not set or PTE2 unmapped
2462    if( ((old_attr & GPT_COW) == 0) || ((old_attr & GPT_MAPPED) == 0) )
2463    {
2464        hal_gpt_unlock_pte( gpt_xp , vpn );
2465
2466        return EXCP_USER_ERROR;
2467    }
2468
2469    // get pointers on physical page descriptor
2470    xptr_t   page_xp  = ppm_ppn2page( old_ppn );
2471    cxy_t    page_cxy = GET_CXY( page_xp );
2472    page_t * page_ptr = GET_PTR( page_xp );
2473
2474    // get extended pointers on forks and lock field in page descriptor
2475    xptr_t forks_xp       = XPTR( page_cxy , &page_ptr->forks );
2476    xptr_t forks_lock_xp  = XPTR( page_cxy , &page_ptr->lock );
2477
2478    // take lock protecting "forks" counter
2479    remote_busylock_acquire( forks_lock_xp );
2480
2481    // get number of pending forks from page descriptor
2482    uint32_t forks = hal_remote_l32( forks_xp );
2483
2484#if DEBUG_VMM_HANDLE_COW
2485if( (DEBUG_VMM_HANDLE_COW < cycle) && (vpn > 0) )
2486printk("\n[%s] thread[%x,%x] get forks = %d for vpn %x\n",
2487__FUNCTION__, this->process->pid, this->trdid, forks, vpn );
2488#endif
2489
2490    if( forks )        // pending fork => allocate a new page, and copy old to new
2491    {
2492        // decrement pending forks counter in page descriptor
2493        hal_remote_atomic_add( forks_xp , -1 );
2494
2495        // release lock protecting "forks" counter
2496        remote_busylock_release( forks_lock_xp );
2497
2498        // allocate a new physical page depending on vseg type
2499        page_xp = vmm_page_allocate( vseg , vpn );
2500
2501        if( page_xp == XPTR_NULL ) 
2502        {
2503            printk("\n[PANIC] in %s : no memory for vpn %x in process %x\n",
2504            __FUNCTION__ , vpn, process->pid );
2505
2506            hal_gpt_unlock_pte( gpt_xp , vpn ); 
2507
2508            return EXCP_KERNEL_PANIC;
2509        }
2510
2511        // compute allocated page PPN
2512        new_ppn = ppm_page2ppn( page_xp );
2513
2514#if DEBUG_VMM_HANDLE_COW
2515if( (DEBUG_VMM_HANDLE_COW < cycle) && (vpn > 0) )
2516printk("\n[%s] thread[%x,%x] get new ppn %x for vpn %x\n",
2517__FUNCTION__, this->process->pid, this->trdid, new_ppn, vpn );
2518#endif
2519
2520        // copy old page content to new page
2521        hal_remote_memcpy( ppm_ppn2base( new_ppn ),
2522                           ppm_ppn2base( old_ppn ),
2523                           CONFIG_PPM_PAGE_SIZE );
2524
2525#if DEBUG_VMM_HANDLE_COW
2526if( (DEBUG_VMM_HANDLE_COW < cycle) && (vpn > 0) )
2527printk("\n[%s] thread[%x,%x] copied old page to new page\n",
2528__FUNCTION__, this->process->pid, this->trdid );
2529#endif
2530
2531    }             
2532    else               // no pending fork => keep the existing page
2533    {
2534        // release lock protecting "forks" counter
2535        remote_busylock_release( forks_lock_xp );
2536
2537#if(DEBUG_VMM_HANDLE_COW & 1)
2538if( (DEBUG_VMM_HANDLE_COW < cycle) && (vpn > 0) )
2539printk("\n[%s] thread[%x,%x] no pending forks / keep existing PPN %x\n",
2540__FUNCTION__, this->process->pid, this->trdid, old_ppn );
2541#endif
2542        new_ppn = old_ppn;
2543    }
2544
2545    // build new_attr : set WRITABLE, reset COW, reset LOCKED
2546    new_attr = (((old_attr | GPT_WRITABLE) & (~GPT_COW)) & (~GPT_LOCKED));
2547
2548#if(DEBUG_VMM_HANDLE_COW & 1)
2549if( (DEBUG_VMM_HANDLE_COW < cycle) && (vpn > 0) )
2550printk("\n[%s] thread[%x,%x] new_attr %x / new_ppn %x\n",
2551__FUNCTION__, this->process->pid, this->trdid, new_attr, new_ppn );
2552#endif
2553
2554    // update the relevant GPT(s)
2555    // - private vseg => update only the local GPT
2556    // - public vseg => update the reference GPT AND all the GPT copies
2557    if( (vseg->type == VSEG_TYPE_STACK) || (vseg->type == VSEG_TYPE_CODE) )
2558    {
2559        // set new PTE in local gpt
2560        hal_gpt_set_pte( gpt_xp,
2561                         vpn,
2562                         new_attr,
2563                         new_ppn );
2564    }
2565    else
2566    {
2567        // set new PTE in all GPT copies
2568        vmm_global_update_pte( process,
2569                               vpn,
2570                               new_attr,
2571                               new_ppn );
2572    }
2573
2574#if DEBUG_VMM_HANDLE_COW
2575cycle = (uint32_t)hal_get_cycles();
2576if( (DEBUG_VMM_HANDLE_COW < cycle) && (vpn > 0) )
2577printk("\n[%s] thread[%x,%x] exit for vpn %x / core[%x,%d] / cycle %d\n",
2578__FUNCTION__, this->process->pid, this->trdid, vpn, local_cxy, this->core->lid, cycle );
2579#endif
2580
2581#if ((DEBUG_VMM_HANDLE_COW & 3) == 3)
2582hal_vmm_display( XPTR( local_cxy , process ) , true );
2583#endif
2584
2585     return EXCP_NON_FATAL;
2586
2587}   // end vmm_handle_cow()
2588
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