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source: trunk/kernel/mm/vmm.c @ 633

Last change on this file since 633 was 633, checked in by alain, 5 years ago
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File size: 81.4 KB

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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_rwlock.h>
35	#include <remote_queuelock.h>
36	#include <list.h>
37	#include <xlist.h>
38	#include <bits.h>
39	#include <process.h>
40	#include <thread.h>
41	#include <vseg.h>
42	#include <cluster.h>
43	#include <scheduler.h>
44	#include <vfs.h>
45	#include <mapper.h>
46	#include <page.h>
47	#include <kmem.h>
48	#include <vmm.h>
49	#include <hal_exception.h>
50
51	//////////////////////////////////////////////////////////////////////////////////
52	// Extern global variables
53	//////////////////////////////////////////////////////////////////////////////////
54
55	extern process_t process_zero; // allocated in cluster.c
56
57	////////////////////////////////////////////////////////////////////////////////////////////
58	// This static function is called by the vmm_create_vseg() function, and implements
59	// the VMM STACK specific allocator.
60	////////////////////////////////////////////////////////////////////////////////////////////
61	// @ vmm : [in] pointer on VMM.
62	// @ ltid : [in] requested slot == local user thread identifier.
63	// @ vpn_base : [out] first allocated page
64	// @ vpn_size : [out] number of allocated pages
65	////////////////////////////////////////////////////////////////////////////////////////////
66	static void vmm_stack_alloc( vmm_t * vmm,
67	ltid_t ltid,
68	vpn_t * vpn_base,
69	vpn_t * vpn_size )
70	{
71
72	// check ltid argument
73	assert( (ltid <= ((CONFIG_VMM_VSPACE_SIZE - CONFIG_VMM_STACK_BASE) / CONFIG_VMM_STACK_SIZE)),
74	"slot index %d too large for an user stack vseg", ltid );
75
76	// get stack allocator pointer
77	stack_mgr_t * mgr = &vmm->stack_mgr;
78
79	// get lock on stack allocator
80	busylock_acquire( &mgr->lock );
81
82	// check requested slot is available
83	assert( (bitmap_state( &mgr->bitmap , ltid ) == false),
84	"slot index %d already allocated", ltid );
85
86	// update bitmap
87	bitmap_set( &mgr->bitmap , ltid );
88
89	// release lock on stack allocator
90	busylock_release( &mgr->lock );
91
92	// returns vpn_base, vpn_size (first page non allocated)
93	vpn_base = mgr->vpn_base + ltid CONFIG_VMM_STACK_SIZE + 1;
94	*vpn_size = CONFIG_VMM_STACK_SIZE - 1;
95
96	} // end vmm_stack_alloc()
97
98	////////////////////////////////////////////////////////////////////////////////////////////
99	// This static function is called by the vmm_remove_vseg() function, and implements
100	// the VMM STACK specific desallocator.
101	////////////////////////////////////////////////////////////////////////////////////////////
102	// @ vmm : [in] pointer on VMM.
103	// @ vseg : [in] pointer on released vseg.
104	////////////////////////////////////////////////////////////////////////////////////////////
105	static void vmm_stack_free( vmm_t * vmm,
106	vseg_t * vseg )
107	{
108	// get stack allocator pointer
109	stack_mgr_t * mgr = &vmm->stack_mgr;
110
111	// compute slot index
112	uint32_t index = (vseg->vpn_base - 1 - mgr->vpn_base) / CONFIG_VMM_STACK_SIZE;
113
114	// check index
115	assert( (index <= ((CONFIG_VMM_VSPACE_SIZE - CONFIG_VMM_STACK_BASE) / CONFIG_VMM_STACK_SIZE)),
116	"slot index %d too large for an user stack vseg", index );
117
118	// check released slot is allocated
119	assert( (bitmap_state( &mgr->bitmap , index ) == true),
120	"released slot index %d non allocated", index );
121
122	// get lock on stack allocator
123	busylock_acquire( &mgr->lock );
124
125	// update stacks_bitmap
126	bitmap_clear( &mgr->bitmap , index );
127
128	// release lock on stack allocator
129	busylock_release( &mgr->lock );
130
131	} // end vmm_stack_free()
132
133	////////////////////////////////////////////////////////////////////////////////////////////
134	// This static function is called by the vmm_create_vseg() function, and implements
135	// the VMM MMAP specific allocator.
136	////////////////////////////////////////////////////////////////////////////////////////////
137	// @ vmm : [in] pointer on VMM.
138	// @ npages : [in] requested number of pages.
139	// @ vpn_base : [out] first allocated page.
140	// @ vpn_size : [out] actual number of allocated pages.
141	////////////////////////////////////////////////////////////////////////////////////////////
142	static error_t vmm_mmap_alloc( vmm_t * vmm,
143	vpn_t npages,
144	vpn_t * vpn_base,
145	vpn_t * vpn_size )
146	{
147	uint32_t order;
148	xptr_t vseg_xp;
149	vseg_t * vseg;
150	vpn_t base;
151	vpn_t size;
152	vpn_t free;
153
154	#if DEBUG_VMM_MMAP_ALLOC
155	thread_t * this = CURRENT_THREAD;
156	uint32_t cycle = (uint32_t)hal_get_cycles();
157	if( DEBUG_VMM_MMAP_ALLOC < cycle )
158	printk("\n[%s] thread[%x,%x] enter / cycle %d\n",
159	__FUNCTION__, this->process->pid, this->trdid, cycle );
160	#endif
161
162	// number of allocated pages must be power of 2
163	// compute actual size and order
164	size = POW2_ROUNDUP( npages );
165	order = bits_log2( size );
166
167	// get mmap allocator pointer
168	mmap_mgr_t * mgr = &vmm->mmap_mgr;
169
170	// build extended pointer on root of zombi_list[order]
171	xptr_t root_xp = XPTR( local_cxy , &mgr->zombi_list[order] );
172
173	// take lock protecting zombi_lists
174	busylock_acquire( &mgr->lock );
175
176	// get vseg from zombi_list or from mmap zone
177	if( xlist_is_empty( root_xp ) ) // from mmap zone
178	{
179	// check overflow
180	free = mgr->first_free_vpn;
181	if( (free + size) > mgr->vpn_size ) return -1;
182
183	// update MMAP allocator
184	mgr->first_free_vpn += size;
185
186	// compute base
187	base = free;
188	}
189	else // from zombi_list
190	{
191	// get pointer on zombi vseg from zombi_list
192	vseg_xp = XLIST_FIRST( root_xp , vseg_t , xlist );
193	vseg = GET_PTR( vseg_xp );
194
195	// remove vseg from free-list
196	xlist_unlink( XPTR( local_cxy , &vseg->xlist ) );
197
198	// compute base
199	base = vseg->vpn_base;
200	}
201
202	// release lock
203	busylock_release( &mgr->lock );
204
205	#if DEBUG_VMM_MMAP_ALLOC
206	cycle = (uint32_t)hal_get_cycles();
207	if( DEBUG_VMM_DESTROY < cycle )
208	printk("\n[%s] thread[%x,%x] exit / vpn_base %x / vpn_size %x / cycle %d\n",
209	__FUNCTION__, this->process->pid, this->trdid, base, size, cycle );
210	#endif
211
212	// returns vpn_base, vpn_size
213	*vpn_base = base;
214	*vpn_size = size;
215	return 0;
216
217	} // end vmm_mmap_alloc()
218
219	////////////////////////////////////////////////////////////////////////////////////////////
220	// This static function is called by the vmm_remove_vseg() function, and implements
221	// the VMM MMAP specific desallocator.
222	////////////////////////////////////////////////////////////////////////////////////////////
223	// @ vmm : [in] pointer on VMM.
224	// @ vseg : [in] pointer on released vseg.
225	////////////////////////////////////////////////////////////////////////////////////////////
226	static void vmm_mmap_free( vmm_t * vmm,
227	vseg_t * vseg )
228	{
229	// get pointer on mmap allocator
230	mmap_mgr_t * mgr = &vmm->mmap_mgr;
231
232	// compute zombi_list order
233	uint32_t order = bits_log2( vseg->vpn_size );
234
235	// take lock protecting zombi lists
236	busylock_acquire( &mgr->lock );
237
238	// update relevant zombi_list
239	xlist_add_first( XPTR( local_cxy , &mgr->zombi_list[order] ),
240	XPTR( local_cxy , &vseg->xlist ) );
241
242	// release lock
243	busylock_release( &mgr->lock );
244
245	} // end of vmm_mmap_free()
246
247	////////////////////////////////////////////////////////////////////////////////////////////
248	// This static function registers one vseg in the VSL of a local process descriptor.
249	////////////////////////////////////////////////////////////////////////////////////////////
250	// vmm : [in] pointer on VMM.
251	// vseg : [in] pointer on vseg.
252	////////////////////////////////////////////////////////////////////////////////////////////
253	void vmm_attach_vseg_to_vsl( vmm_t * vmm,
254	vseg_t * vseg )
255	{
256	// update vseg descriptor
257	vseg->vmm = vmm;
258
259	// increment vsegs number
260	vmm->vsegs_nr++;
261
262	// add vseg in vmm list
263	xlist_add_last( XPTR( local_cxy , &vmm->vsegs_root ),
264	XPTR( local_cxy , &vseg->xlist ) );
265
266	} // end vmm_attach_vseg_from_vsl()
267
268	////////////////////////////////////////////////////////////////////////////////////////////
269	// This static function removes one vseg from the VSL of a local process descriptor.
270	////////////////////////////////////////////////////////////////////////////////////////////
271	// vmm : [in] pointer on VMM.
272	// vseg : [in] pointer on vseg.
273	////////////////////////////////////////////////////////////////////////////////////////////
274	void vmm_detach_vseg_from_vsl( vmm_t * vmm,
275	vseg_t * vseg )
276	{
277	// update vseg descriptor
278	vseg->vmm = NULL;
279
280	// decrement vsegs number
281	vmm->vsegs_nr--;
282
283	// remove vseg from VSL
284	xlist_unlink( XPTR( local_cxy , &vseg->xlist ) );
285
286	} // end vmm_detach_from_vsl()
287
288
289
290
291	////////////////////////////////////////////
292	error_t vmm_user_init( process_t * process )
293	{
294	vseg_t * vseg_args;
295	vseg_t * vseg_envs;
296	intptr_t base;
297	intptr_t size;
298	uint32_t i;
299
300	#if DEBUG_VMM_USER_INIT
301	thread_t * this = CURRENT_THREAD;
302	uint32_t cycle = (uint32_t)hal_get_cycles();
303	if( DEBUG_VMM_USER_INIT )
304	printk("\n[%s] thread[%x,%x] enter for process %x in cluster %x / cycle %d\n",
305	__FUNCTION__ , this->process->pid, this->trdid, process->pid, local_cxy, cycle );
306	#endif
307
308	// get pointer on VMM
309	vmm_t * vmm = &process->vmm;
310
311	// check UTILS zone
312	assert( ((CONFIG_VMM_ARGS_SIZE + CONFIG_VMM_ENVS_SIZE) <=
313	(CONFIG_VMM_ELF_BASE - CONFIG_VMM_UTILS_BASE)) ,
314	"UTILS zone too small\n" );
315
316	// check STACK zone
317	assert( ((CONFIG_VMM_STACK_SIZE * CONFIG_THREADS_MAX_PER_CLUSTER) <=
318	(CONFIG_VMM_VSPACE_SIZE - CONFIG_VMM_STACK_BASE)) ,
319	"STACK zone too small\n");
320
321	// register "args" vseg in VSL
322	base = CONFIG_VMM_UTILS_BASE << CONFIG_PPM_PAGE_SHIFT;
323	size = CONFIG_VMM_ARGS_SIZE << CONFIG_PPM_PAGE_SHIFT;
324
325	vseg_args = vmm_create_vseg( process,
326	VSEG_TYPE_DATA,
327	base,
328	size,
329	0, // file_offset unused
330	0, // file_size unused
331	XPTR_NULL, // mapper_xp unused
332	local_cxy );
333	if( vseg_args == NULL )
334	{
335	printk("\n[ERROR] in %s : cannot register args vseg\n", __FUNCTION__ );
336	return -1;
337	}
338
339	vmm->args_vpn_base = base;
340
341	// register "envs" vseg in VSL
342	base = (CONFIG_VMM_UTILS_BASE + CONFIG_VMM_ARGS_SIZE) << CONFIG_PPM_PAGE_SHIFT;
343	size = CONFIG_VMM_ENVS_SIZE << CONFIG_PPM_PAGE_SHIFT;
344
345	vseg_envs = vmm_create_vseg( process,
346	VSEG_TYPE_DATA,
347	base,
348	size,
349	0, // file_offset unused
350	0, // file_size unused
351	XPTR_NULL, // mapper_xp unused
352	local_cxy );
353	if( vseg_envs == NULL )
354	{
355	printk("\n[ERROR] in %s : cannot register envs vseg\n", __FUNCTION__ );
356	return -1;
357	}
358
359	vmm->envs_vpn_base = base;
360
361	// initialize STACK allocator
362	vmm->stack_mgr.bitmap = 0;
363	vmm->stack_mgr.vpn_base = CONFIG_VMM_STACK_BASE;
364	busylock_init( &vmm->stack_mgr.lock , LOCK_VMM_STACK );
365
366	// initialize MMAP allocator
367	vmm->mmap_mgr.vpn_base = CONFIG_VMM_HEAP_BASE;
368	vmm->mmap_mgr.vpn_size = CONFIG_VMM_STACK_BASE - CONFIG_VMM_HEAP_BASE;
369	vmm->mmap_mgr.first_free_vpn = CONFIG_VMM_HEAP_BASE;
370	busylock_init( &vmm->mmap_mgr.lock , LOCK_VMM_MMAP );
371	for( i = 0 ; i < 32 ; i++ )
372	{
373	xlist_root_init( XPTR( local_cxy , &vmm->mmap_mgr.zombi_list[i] ) );
374	}
375
376	// initialize instrumentation counters
377	vmm->pgfault_nr = 0;
378
379	hal_fence();
380
381	#if DEBUG_VMM_USER_INIT
382	cycle = (uint32_t)hal_get_cycles();
383	if( DEBUG_VMM_USER_INIT )
384	printk("\n[%s] thread[%x,%x] exit for process %x in cluster %x / cycle %d\n",
385	__FUNCTION__, this->process->pid, this->trdid, process->pid, local_cxy, cycle );
386	#endif
387
388	return 0;
389
390	} // end vmm_user_init()
391
392	//////////////////////////////////////////
393	void vmm_user_reset( process_t * process )
394	{
395	xptr_t vseg_xp;
396	vseg_t * vseg;
397	vseg_type_t vseg_type;
398
399	#if DEBUG_VMM_USER_RESET
400	uint32_t cycle = (uint32_t)hal_get_cycles();
401	thread_t * this = CURRENT_THREAD;
402	if( DEBUG_VMM_USER_RESET < cycle )
403	printk("\n[%s] thread[%x,%x] enter for process %x in cluster %x / cycle %d\n",
404	__FUNCTION__, this->process->pid, this->trdid, process->pid, local_cxy, cycle );
405	#endif
406
407	#if (DEBUG_VMM_USER_RESET & 1 )
408	if( DEBUG_VMM_USER_RESET < cycle )
409	hal_vmm_display( process , true );
410	#endif
411
412	// get pointer on local VMM
413	vmm_t * vmm = &process->vmm;
414
415	// build extended pointer on VSL root and VSL lock
416	xptr_t root_xp = XPTR( local_cxy , &vmm->vsegs_root );
417	xptr_t lock_xp = XPTR( local_cxy , &vmm->vsl_lock );
418
419	// take the VSL lock
420	remote_rwlock_wr_acquire( lock_xp );
421
422	// scan the VSL to delete all non kernel vsegs
423	// (we don't use a FOREACH in case of item deletion)
424	xptr_t iter_xp;
425	xptr_t next_xp;
426	for( iter_xp = hal_remote_l64( root_xp ) ;
427	iter_xp != root_xp ;
428	iter_xp = next_xp )
429	{
430	// save extended pointer on next item in xlist
431	next_xp = hal_remote_l64( iter_xp );
432
433	// get pointers on current vseg in VSL
434	vseg_xp = XLIST_ELEMENT( iter_xp , vseg_t , xlist );
435	vseg = GET_PTR( vseg_xp );
436	vseg_type = vseg->type;
437
438	#if( DEBUG_VMM_USER_RESET & 1 )
439	if( DEBUG_VMM_USER_RESET < cycle )
440	printk("\n[%s] found %s vseg / vpn_base %x / vpn_size %d\n",
441	__FUNCTION__ , vseg_type_str( vseg->type ), vseg->vpn_base, vseg->vpn_size );
442	#endif
443	// delete non kernel vseg
444	if( (vseg_type != VSEG_TYPE_KCODE) &&
445	(vseg_type != VSEG_TYPE_KDATA) &&
446	(vseg_type != VSEG_TYPE_KDEV ) )
447	{
448	// remove vseg from VSL
449	vmm_remove_vseg( process , vseg );
450
451	#if( DEBUG_VMM_USER_RESET & 1 )
452	if( DEBUG_VMM_USER_RESET < cycle )
453	printk("\n[%s] %s vseg deleted / vpn_base %x / vpn_size %d\n",
454	__FUNCTION__ , vseg_type_str( vseg->type ), vseg->vpn_base, vseg->vpn_size );
455	#endif
456	}
457	else
458	{
459
460	#if( DEBUG_VMM_USER_RESET & 1 )
461	if( DEBUG_VMM_USER_RESET < cycle )
462	printk("\n[%s] keep %s vseg / vpn_base %x / vpn_size %d\n",
463	__FUNCTION__ , vseg_type_str( vseg->type ), vseg->vpn_base, vseg->vpn_size );
464	#endif
465	}
466	} // end loop on vsegs in VSL
467
468	// release the VSL lock
469	remote_rwlock_wr_release( lock_xp );
470
471	// FIXME il faut gérer les process copies...
472
473	#if DEBUG_VMM_USER_RESET
474	cycle = (uint32_t)hal_get_cycles();
475	if( DEBUG_VMM_USER_RESET < cycle )
476	printk("\n[%s] thread[%x,%x] exit for process %x in cluster %x / cycle %d\n",
477	__FUNCTION__, this->process->pid, this->trdid, process->pid, local_cxy , cycle );
478	#endif
479
480	} // end vmm_user_reset()
481
482	////////////////////////////////////////////////
483	void vmm_global_update_pte( process_t * process,
484	vpn_t vpn,
485	uint32_t attr,
486	ppn_t ppn )
487	{
488	xlist_entry_t * process_root_ptr;
489	xptr_t process_root_xp;
490	xptr_t process_iter_xp;
491
492	xptr_t remote_process_xp;
493	cxy_t remote_process_cxy;
494	process_t * remote_process_ptr;
495	xptr_t remote_gpt_xp;
496
497	pid_t pid;
498	cxy_t owner_cxy;
499	lpid_t owner_lpid;
500
501	#if DEBUG_VMM_UPDATE_PTE
502	uint32_t cycle = (uint32_t)hal_get_cycles();
503	thread_t * this = CURRENT_THREAD;
504	if( DEBUG_VMM_UPDATE_PTE < cycle )
505	printk("\n[%s] thread[%x,%x] enter for process %x / vpn %x / cycle %d\n",
506	__FUNCTION__, this->process->pid, this->trdid, process->pid , vpn , cycle );
507	#endif
508
509	// check cluster is reference
510	assert( (GET_CXY( process->ref_xp ) == local_cxy) , "not called in reference cluster\n");
511
512	// get extended pointer on root of process copies xlist in owner cluster
513	pid = process->pid;
514	owner_cxy = CXY_FROM_PID( pid );
515	owner_lpid = LPID_FROM_PID( pid );
516	process_root_ptr = &LOCAL_CLUSTER->pmgr.copies_root[owner_lpid];
517	process_root_xp = XPTR( owner_cxy , process_root_ptr );
518
519	// loop on destination process copies
520	XLIST_FOREACH( process_root_xp , process_iter_xp )
521	{
522	// get cluster and local pointer on remote process
523	remote_process_xp = XLIST_ELEMENT( process_iter_xp , process_t , copies_list );
524	remote_process_ptr = GET_PTR( remote_process_xp );
525	remote_process_cxy = GET_CXY( remote_process_xp );
526
527	#if (DEBUG_VMM_UPDATE_PTE & 0x1)
528	if( DEBUG_VMM_UPDATE_PTE < cycle )
529	printk("\n[%s] threadr[%x,%x] handling vpn %x for process %x in cluster %x\n",
530	__FUNCTION__, this->process->pid, this->trdid, vpn, process->pid, remote_process_cxy );
531	#endif
532
533	// get extended pointer on remote gpt
534	remote_gpt_xp = XPTR( remote_process_cxy , &remote_process_ptr->vmm.gpt );
535
536	// update remote GPT
537	hal_gpt_update_pte( remote_gpt_xp, vpn, attr, ppn );
538	}
539
540	#if DEBUG_VMM_UPDATE_PTE
541	cycle = (uint32_t)hal_get_cycles();
542	if( DEBUG_VMM_UPDATE_PTE < cycle )
543	printk("\n[%s] thread[%x,%x] exit for process %x / vpn %x / cycle %d\n",
544	__FUNCTION__, this->process->pid, this->trdid, process->pid , vpn , cycle );
545	#endif
546
547	} // end vmm_global_update_pte()
548
549	///////////////////////////////////////
550	void vmm_set_cow( process_t * process )
551	{
552	vmm_t * vmm;
553
554	xlist_entry_t * process_root_ptr;
555	xptr_t process_root_xp;
556	xptr_t process_iter_xp;
557
558	xptr_t remote_process_xp;
559	cxy_t remote_process_cxy;
560	process_t * remote_process_ptr;
561	xptr_t remote_gpt_xp;
562
563	xptr_t vseg_root_xp;
564	xptr_t vseg_iter_xp;
565
566	xptr_t vseg_xp;
567	vseg_t * vseg;
568
569	pid_t pid;
570	cxy_t owner_cxy;
571	lpid_t owner_lpid;
572
573	#if DEBUG_VMM_SET_COW
574	uint32_t cycle = (uint32_t)hal_get_cycles();
575	thread_t * this = CURRENT_THREAD;
576	if( DEBUG_VMM_SET_COW < cycle )
577	printk("\n[%s] thread[%x,%x] enter for process %x / cycle %d\n",
578	__FUNCTION__, this->process->pid, this->trdid, process->pid , cycle );
579	#endif
580
581	// check cluster is reference
582	assert( (GET_CXY( process->ref_xp ) == local_cxy) ,
583	"local cluster is not process reference cluster\n");
584
585	// get pointer on reference VMM
586	vmm = &process->vmm;
587
588	// get extended pointer on root of process copies xlist in owner cluster
589	pid = process->pid;
590	owner_cxy = CXY_FROM_PID( pid );
591	owner_lpid = LPID_FROM_PID( pid );
592	process_root_ptr = &LOCAL_CLUSTER->pmgr.copies_root[owner_lpid];
593	process_root_xp = XPTR( owner_cxy , process_root_ptr );
594
595	// get extended pointer on root of vsegs xlist from reference VMM
596	vseg_root_xp = XPTR( local_cxy , &vmm->vsegs_root );
597
598	// loop on destination process copies
599	XLIST_FOREACH( process_root_xp , process_iter_xp )
600	{
601	// get cluster and local pointer on remote process
602	remote_process_xp = XLIST_ELEMENT( process_iter_xp , process_t , copies_list );
603	remote_process_ptr = GET_PTR( remote_process_xp );
604	remote_process_cxy = GET_CXY( remote_process_xp );
605
606	#if (DEBUG_VMM_SET_COW & 1)
607	if( DEBUG_VMM_SET_COW < cycle )
608	printk("\n[%s] thread[%x,%x] handling process %x in cluster %x\n",
609	__FUNCTION__, this->process->pid, this->trdid, process->pid , remote_process_cxy );
610	#endif
611
612	// get extended pointer on remote gpt
613	remote_gpt_xp = XPTR( remote_process_cxy , &remote_process_ptr->vmm.gpt );
614
615	// loop on vsegs in (local) reference process VSL
616	XLIST_FOREACH( vseg_root_xp , vseg_iter_xp )
617	{
618	// get pointer on vseg
619	vseg_xp = XLIST_ELEMENT( vseg_iter_xp , vseg_t , xlist );
620	vseg = GET_PTR( vseg_xp );
621
622	assert( (GET_CXY( vseg_xp ) == local_cxy) ,
623	"all vsegs in reference VSL must be local\n" );
624
625	// get vseg type, base and size
626	uint32_t type = vseg->type;
627	vpn_t vpn_base = vseg->vpn_base;
628	vpn_t vpn_size = vseg->vpn_size;
629
630	#if (DEBUG_VMM_SET_COW & 1)
631	if( DEBUG_VMM_SET_COW < cycle )
632	printk("\n[%s] thread[%x,%x] handling vseg %s / vpn_base = %x / vpn_size = %x\n",
633	__FUNCTION__, this->process->pid, this->trdid, vseg_type_str(type), vpn_base, vpn_size );
634	#endif
635	// only DATA, ANON and REMOTE vsegs
636	if( (type == VSEG_TYPE_DATA) \|\|
637	(type == VSEG_TYPE_ANON) \|\|
638	(type == VSEG_TYPE_REMOTE) )
639	{
640	vpn_t vpn;
641	uint32_t attr;
642	ppn_t ppn;
643	xptr_t page_xp;
644	cxy_t page_cxy;
645	page_t * page_ptr;
646	xptr_t forks_xp;
647	xptr_t lock_xp;
648
649	// update flags in remote GPT
650	hal_gpt_set_cow( remote_gpt_xp,
651	vpn_base,
652	vpn_size );
653
654	// atomically increment pending forks counter in physical pages,
655	// for all vseg pages that are mapped in reference cluster
656	if( remote_process_cxy == local_cxy )
657	{
658	// scan all pages in vseg
659	for( vpn = vpn_base ; vpn < (vpn_base + vpn_size) ; vpn++ )
660	{
661	// get page attributes and PPN from reference GPT
662	hal_gpt_get_pte( remote_gpt_xp , vpn , &attr , &ppn );
663
664	// atomically update pending forks counter if page is mapped
665	if( attr & GPT_MAPPED )
666	{
667	// get pointers and cluster on page descriptor
668	page_xp = ppm_ppn2page( ppn );
669	page_cxy = GET_CXY( page_xp );
670	page_ptr = GET_PTR( page_xp );
671
672	// get extended pointers on "forks" and "lock"
673	forks_xp = XPTR( page_cxy , &page_ptr->forks );
674	lock_xp = XPTR( page_cxy , &page_ptr->lock );
675
676	// take lock protecting "forks" counter
677	remote_busylock_acquire( lock_xp );
678
679	// increment "forks"
680	hal_remote_atomic_add( forks_xp , 1 );
681
682	// release lock protecting "forks" counter
683	remote_busylock_release( lock_xp );
684	}
685	} // end loop on vpn
686	} // end if local
687	} // end if vseg type
688	} // end loop on vsegs
689	} // end loop on process copies
690
691	#if DEBUG_VMM_SET_COW
692	cycle = (uint32_t)hal_get_cycles();
693	if( DEBUG_VMM_SET_COW < cycle )
694	printk("\n[%s] thread[%x,%x] exit for process %x / cycle %d\n",
695	__FUNCTION__, this->process->pid, this->trdid, process->pid , cycle );
696	#endif
697
698	} // end vmm_set-cow()
699
700	/////////////////////////////////////////////////
701	error_t vmm_fork_copy( process_t * child_process,
702	xptr_t parent_process_xp )
703	{
704	error_t error;
705	cxy_t parent_cxy;
706	process_t * parent_process;
707	vmm_t * parent_vmm;
708	xptr_t parent_lock_xp;
709	vmm_t * child_vmm;
710	xptr_t iter_xp;
711	xptr_t parent_vseg_xp;
712	vseg_t * parent_vseg;
713	vseg_t * child_vseg;
714	uint32_t type;
715	bool_t cow;
716	vpn_t vpn;
717	vpn_t vpn_base;
718	vpn_t vpn_size;
719	xptr_t page_xp; // extended pointer on page descriptor
720	page_t * page_ptr;
721	cxy_t page_cxy;
722	xptr_t forks_xp; // extended pointer on forks counter in page descriptor
723	xptr_t parent_root_xp;
724	bool_t mapped;
725	ppn_t ppn;
726
727	#if DEBUG_VMM_FORK_COPY
728	uint32_t cycle = (uint32_t)hal_get_cycles();
729	thread_t * this = CURRENT_THREAD;
730	if( DEBUG_VMM_FORK_COPY < cycle )
731	printk("\n[%s] thread %x enter / cycle %d\n",
732	__FUNCTION__ , this->process->pid, this->trdid, cycle );
733	#endif
734
735	// get parent process cluster and local pointer
736	parent_cxy = GET_CXY( parent_process_xp );
737	parent_process = GET_PTR( parent_process_xp );
738
739	// get local pointers on parent and child VMM
740	parent_vmm = &parent_process->vmm;
741	child_vmm = &child_process->vmm;
742
743	// initialize the lock protecting the child VSL
744	remote_rwlock_init( XPTR( local_cxy , &child_vmm->vsl_lock ) , LOCK_VMM_VSL );
745
746	// initialize the child VSL as empty
747	xlist_root_init( XPTR( local_cxy, &child_vmm->vsegs_root ) );
748	child_vmm->vsegs_nr = 0;
749
750	// create an empty child GPT
751	error = hal_gpt_create( &child_vmm->gpt );
752	if( error )
753	{
754	printk("\n[ERROR] in %s : cannot create GPT\n", __FUNCTION__ );
755	return -1;
756	}
757
758	// build extended pointer on parent VSL root and lock
759	parent_root_xp = XPTR( parent_cxy , &parent_vmm->vsegs_root );
760	parent_lock_xp = XPTR( parent_cxy , &parent_vmm->vsl_lock );
761
762	// take the lock protecting the parent VSL in read mode
763	remote_rwlock_rd_acquire( parent_lock_xp );
764
765	// loop on parent VSL xlist
766	XLIST_FOREACH( parent_root_xp , iter_xp )
767	{
768	// get pointers on current parent vseg
769	parent_vseg_xp = XLIST_ELEMENT( iter_xp , vseg_t , xlist );
770	parent_vseg = GET_PTR( parent_vseg_xp );
771
772	// get vseg type
773	type = hal_remote_l32( XPTR( parent_cxy , &parent_vseg->type ) );
774
775	#if DEBUG_VMM_FORK_COPY
776	cycle = (uint32_t)hal_get_cycles();
777	if( DEBUG_VMM_FORK_COPY < cycle )
778	printk("\n[%s] thread[%x,%x] found parent vseg %s / vpn_base = %x / cycle %d\n",
779	__FUNCTION__ , this->process->pid, this->trdid, vseg_type_str(type),
780	hal_remote_l32( XPTR( parent_cxy , &parent_vseg->vpn_base ) ) , cycle );
781	#endif
782
783	// all parent vsegs - but STACK and kernel vsegs - must be copied in child VSL
784	if( (type != VSEG_TYPE_STACK) && (type != VSEG_TYPE_KCODE) &&
785	(type != VSEG_TYPE_KDATA) && (type != VSEG_TYPE_KDEV) )
786	{
787	// allocate memory for a new child vseg
788	child_vseg = vseg_alloc();
789	if( child_vseg == NULL ) // release all allocated vsegs
790	{
791	vmm_destroy( child_process );
792	printk("\n[ERROR] in %s : cannot create vseg for child\n", __FUNCTION__ );
793	return -1;
794	}
795
796	// copy parent vseg to child vseg
797	vseg_init_from_ref( child_vseg , parent_vseg_xp );
798
799	// build extended pointer on VSL lock
800	xptr_t lock_xp = XPTR( local_cxy , &child_vmm->vsl_lock );
801
802	// take the VSL lock in write mode
803	remote_rwlock_wr_acquire( lock_xp );
804
805	// register child vseg in child VSL
806	vmm_attach_vseg_to_vsl( child_vmm , child_vseg );
807
808	// release the VSL lock
809	remote_rwlock_wr_release( lock_xp );
810
811	#if DEBUG_VMM_FORK_COPY
812	cycle = (uint32_t)hal_get_cycles();
813	if( DEBUG_VMM_FORK_COPY < cycle )
814	printk("\n[%s] thread[%x,%x] copied vseg %s / vpn_base = %x to child VSL / cycle %d\n",
815	__FUNCTION__ , this->process->pid, this->trdid, vseg_type_str(type),
816	hal_remote_l32( XPTR( parent_cxy , &parent_vseg->vpn_base ) ) , cycle );
817	#endif
818	// copy DATA, ANON, REMOTE, FILE parent GPT entries to child GPT
819	if( type != VSEG_TYPE_CODE )
820	{
821	// activate the COW for DATA, ANON, REMOTE vsegs only
822	cow = ( type != VSEG_TYPE_FILE );
823
824	vpn_base = child_vseg->vpn_base;
825	vpn_size = child_vseg->vpn_size;
826
827	// scan pages in parent vseg
828	for( vpn = vpn_base ; vpn < (vpn_base + vpn_size) ; vpn++ )
829	{
830	error = hal_gpt_pte_copy( &child_vmm->gpt,
831	vpn,
832	XPTR( parent_cxy , &parent_vmm->gpt ),
833	vpn,
834	cow,
835	&ppn,
836	&mapped );
837	if( error )
838	{
839	vmm_destroy( child_process );
840	printk("\n[ERROR] in %s : cannot copy GPT\n", __FUNCTION__ );
841	return -1;
842	}
843
844	// increment pending forks counter in page if mapped
845	if( mapped )
846	{
847	// get pointers and cluster on page descriptor
848	page_xp = ppm_ppn2page( ppn );
849	page_cxy = GET_CXY( page_xp );
850	page_ptr = GET_PTR( page_xp );
851
852	// get extended pointers on "forks" and "lock"
853	forks_xp = XPTR( page_cxy , &page_ptr->forks );
854	lock_xp = XPTR( page_cxy , &page_ptr->lock );
855
856	// get lock protecting "forks" counter
857	remote_busylock_acquire( lock_xp );
858
859	// increment "forks"
860	hal_remote_atomic_add( forks_xp , 1 );
861
862	// release lock protecting "forks" counter
863	remote_busylock_release( lock_xp );
864
865	#if DEBUG_VMM_FORK_COPY
866	cycle = (uint32_t)hal_get_cycles();
867	if( DEBUG_VMM_FORK_COPY < cycle )
868	printk("\n[%s] thread[%x,%x] copied vpn %x to child GPT / cycle %d\n",
869	__FUNCTION__ , this->process->pid, this->trdid , vpn , cycle );
870	#endif
871	}
872	}
873	} // end if no code & no stack
874	} // end if no stack
875	} // end loop on vsegs
876
877	// release the parent VSL lock in read mode
878	remote_rwlock_rd_release( parent_lock_xp );
879
880	// update child VMM with kernel vsegs
881	error = hal_vmm_kernel_update( child_process );
882
883	if( error )
884	{
885	printk("\n[ERROR] in %s : cannot update child VMM\n", __FUNCTION__ );
886	return -1;
887	}
888
889	// initialize the child VMM STACK allocator
890	child_vmm->stack_mgr.bitmap = 0;
891	child_vmm->stack_mgr.vpn_base = CONFIG_VMM_STACK_BASE;
892
893	// initialize the child VMM MMAP allocator
894	uint32_t i;
895	child_vmm->mmap_mgr.vpn_base = CONFIG_VMM_HEAP_BASE;
896	child_vmm->mmap_mgr.vpn_size = CONFIG_VMM_STACK_BASE - CONFIG_VMM_HEAP_BASE;
897	child_vmm->mmap_mgr.first_free_vpn = CONFIG_VMM_HEAP_BASE;
898	for( i = 0 ; i < 32 ; i++ )
899	{
900	xlist_root_init( XPTR( local_cxy , &child_vmm->mmap_mgr.zombi_list[i] ) );
901	}
902
903	// initialize instrumentation counters
904	child_vmm->pgfault_nr = 0;
905
906	// copy base addresses from parent VMM to child VMM
907	child_vmm->args_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->args_vpn_base));
908	child_vmm->envs_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->envs_vpn_base));
909	child_vmm->heap_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->heap_vpn_base));
910	child_vmm->code_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->code_vpn_base));
911	child_vmm->data_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->data_vpn_base));
912
913	child_vmm->entry_point = (intptr_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->entry_point));
914
915	hal_fence();
916
917	#if DEBUG_VMM_FORK_COPY
918	cycle = (uint32_t)hal_get_cycles();
919	if( DEBUG_VMM_FORK_COPY < cycle )
920	printk("\n[%s] thread[%x,%x] exit successfully / cycle %d\n",
921	__FUNCTION__ , this->process->pid, this->trdid , cycle );
922	#endif
923
924	return 0;
925
926	} // vmm_fork_copy()
927
928	///////////////////////////////////////
929	void vmm_destroy( process_t * process )
930	{
931	xptr_t vseg_xp;
932	vseg_t * vseg;
933
934	#if DEBUG_VMM_DESTROY
935	uint32_t cycle = (uint32_t)hal_get_cycles();
936	thread_t * this = CURRENT_THREAD;
937	if( DEBUG_VMM_DESTROY < cycle )
938	printk("\n[%s] thread[%x,%x] enter for process %x in cluster %x / cycle %d\n",
939	__FUNCTION__, this->process->pid, this->trdid, process->pid, local_cxy, cycle );
940	#endif
941
942	#if (DEBUG_VMM_DESTROY & 1 )
943	if( DEBUG_VMM_DESTROY < cycle )
944	hal_vmm_display( process , true );
945	#endif
946
947	// get pointer on local VMM
948	vmm_t * vmm = &process->vmm;
949
950	// build extended pointer on VSL root, VSL lock and GPT lock
951	xptr_t vsl_root_xp = XPTR( local_cxy , &vmm->vsegs_root );
952	xptr_t vsl_lock_xp = XPTR( local_cxy , &vmm->vsl_lock );
953
954	// take the VSL lock
955	remote_rwlock_wr_acquire( vsl_lock_xp );
956
957	// scan the VSL to delete all registered vsegs
958	// (we don't use a FOREACH in case of item deletion)
959	xptr_t iter_xp;
960	xptr_t next_xp;
961	for( iter_xp = hal_remote_l64( vsl_root_xp ) ;
962	iter_xp != vsl_root_xp ;
963	iter_xp = next_xp )
964	{
965	// save extended pointer on next item in xlist
966	next_xp = hal_remote_l64( iter_xp );
967
968	// get pointers on current vseg in VSL
969	vseg_xp = XLIST_ELEMENT( iter_xp , vseg_t , xlist );
970	vseg = GET_PTR( vseg_xp );
971
972	// delete vseg and release physical pages
973	vmm_remove_vseg( process , vseg );
974
975	#if( DEBUG_VMM_DESTROY & 1 )
976	if( DEBUG_VMM_DESTROY < cycle )
977	printk("\n[%s] %s vseg deleted / vpn_base %x / vpn_size %d\n",
978	__FUNCTION__ , vseg_type_str( vseg->type ), vseg->vpn_base, vseg->vpn_size );
979	#endif
980
981	}
982
983	// release the VSL lock
984	remote_rwlock_wr_release( vsl_lock_xp );
985
986	// remove all registered MMAP vsegs
987	// from zombi_lists in MMAP allocator
988	uint32_t i;
989	for( i = 0 ; i<32 ; i++ )
990	{
991	// build extended pointer on zombi_list[i]
992	xptr_t root_xp = XPTR( local_cxy , &vmm->mmap_mgr.zombi_list[i] );
993
994	// scan zombi_list[i]
995	while( !xlist_is_empty( root_xp ) )
996	{
997	vseg_xp = XLIST_FIRST( root_xp , vseg_t , xlist );
998	vseg = GET_PTR( vseg_xp );
999
1000	#if( DEBUG_VMM_DESTROY & 1 )
1001	if( DEBUG_VMM_DESTROY < cycle )
1002	printk("\n[%s] found zombi vseg / vpn_base %x / vpn_size %d\n",
1003	__FUNCTION__ , vseg_type_str( vseg->type ), vseg->vpn_base, vseg->vpn_size );
1004	#endif
1005	// clean vseg descriptor
1006	vseg->vmm = NULL;
1007
1008	// remove vseg from zombi_list
1009	xlist_unlink( XPTR( local_cxy , &vseg->xlist ) );
1010
1011	// release vseg descriptor
1012	vseg_free( vseg );
1013
1014	#if( DEBUG_VMM_DESTROY & 1 )
1015	if( DEBUG_VMM_DESTROY < cycle )
1016	printk("\n[%s] zombi vseg released / vpn_base %x / vpn_size %d\n",
1017	__FUNCTION__ , vseg_type_str( vseg->type ), vseg->vpn_base, vseg->vpn_size );
1018	#endif
1019	}
1020	}
1021
1022	// release memory allocated to the GPT itself
1023	hal_gpt_destroy( &vmm->gpt );
1024
1025	#if DEBUG_VMM_DESTROY
1026	cycle = (uint32_t)hal_get_cycles();
1027	if( DEBUG_VMM_DESTROY < cycle )
1028	printk("\n[%s] thread[%x,%x] exit for process %x in cluster %x / cycle %d\n",
1029	__FUNCTION__, this->process->pid, this->trdid, process->pid, local_cxy , cycle );
1030	#endif
1031
1032	} // end vmm_destroy()
1033
1034	/////////////////////////////////////////////////
1035	vseg_t * vmm_check_conflict( process_t * process,
1036	vpn_t vpn_base,
1037	vpn_t vpn_size )
1038	{
1039	vmm_t * vmm = &process->vmm;
1040
1041	// scan the VSL
1042	vseg_t * vseg;
1043	xptr_t iter_xp;
1044	xptr_t vseg_xp;
1045	xptr_t root_xp = XPTR( local_cxy , &vmm->vsegs_root );
1046
1047	XLIST_FOREACH( root_xp , iter_xp )
1048	{
1049	vseg_xp = XLIST_ELEMENT( iter_xp , vseg_t , xlist );
1050	vseg = GET_PTR( vseg_xp );
1051
1052	if( ((vpn_base + vpn_size) > vseg->vpn_base) &&
1053	(vpn_base < (vseg->vpn_base + vseg->vpn_size)) ) return vseg;
1054	}
1055	return NULL;
1056
1057	} // end vmm_check_conflict()
1058
1059
1060
1061	////////////////////////////////////////////////
1062	vseg_t * vmm_create_vseg( process_t * process,
1063	vseg_type_t type,
1064	intptr_t base,
1065	uint32_t size,
1066	uint32_t file_offset,
1067	uint32_t file_size,
1068	xptr_t mapper_xp,
1069	cxy_t cxy )
1070	{
1071	vseg_t * vseg; // created vseg pointer
1072	vpn_t vpn_base; // first page index
1073	vpn_t vpn_size; // number of pages covered by vseg
1074	error_t error;
1075
1076	#if DEBUG_VMM_CREATE_VSEG
1077	thread_t * this = CURRENT_THREAD;
1078	uint32_t cycle = (uint32_t)hal_get_cycles();
1079	if( DEBUG_VMM_CREATE_VSEG < cycle )
1080	printk("\n[%s] thread[%x,%x] enter for process %x / %s / cxy %x / cycle %d\n",
1081	__FUNCTION__, this->process->pid, this->trdid, process->pid, vseg_type_str(type), cxy, cycle );
1082	#endif
1083
1084	// get pointer on VMM
1085	vmm_t * vmm = &process->vmm;
1086
1087	// compute base, size, vpn_base, vpn_size, depending on vseg type
1088	// we use the VMM specific allocators for "stack", "file", "anon", & "remote" vsegs
1089
1090	if( type == VSEG_TYPE_STACK )
1091	{
1092	// get vpn_base and vpn_size from STACK allocator
1093	vmm_stack_alloc( vmm , base , &vpn_base , &vpn_size );
1094
1095	// compute vseg base and size from vpn_base and vpn_size
1096	base = vpn_base << CONFIG_PPM_PAGE_SHIFT;
1097	size = vpn_size << CONFIG_PPM_PAGE_SHIFT;
1098	}
1099	else if( type == VSEG_TYPE_FILE )
1100	{
1101	// compute page index (in mapper) for first byte
1102	vpn_t vpn_min = file_offset >> CONFIG_PPM_PAGE_SHIFT;
1103
1104	// compute page index (in mapper) for last byte
1105	vpn_t vpn_max = (file_offset + size - 1) >> CONFIG_PPM_PAGE_SHIFT;
1106
1107	// compute offset in first page
1108	uint32_t offset = file_offset & CONFIG_PPM_PAGE_MASK;
1109
1110	// compute number of pages required in virtual space
1111	vpn_t npages = vpn_max - vpn_min + 1;
1112
1113	// get vpn_base and vpn_size from MMAP allocator
1114	error = vmm_mmap_alloc( vmm , npages , &vpn_base , &vpn_size );
1115	if( error )
1116	{
1117	printk("\n[ERROR] in %s : no vspace for mmap vseg / process %x in cluster %x\n",
1118	__FUNCTION__ , process->pid , local_cxy );
1119	return NULL;
1120	}
1121
1122	// set the vseg base (not always aligned for FILE)
1123	base = (vpn_base << CONFIG_PPM_PAGE_SHIFT) + offset;
1124	}
1125	else if( (type == VSEG_TYPE_ANON) \|\|
1126	(type == VSEG_TYPE_REMOTE) )
1127	{
1128	// compute number of required pages in virtual space
1129	vpn_t npages = size >> CONFIG_PPM_PAGE_SHIFT;
1130	if( size & CONFIG_PPM_PAGE_MASK) npages++;
1131
1132	// get vpn_base and vpn_size from MMAP allocator
1133	error = vmm_mmap_alloc( vmm , npages , &vpn_base , &vpn_size );
1134	if( error )
1135	{
1136	printk("\n[ERROR] in %s : no vspace for mmap vseg / process %x in cluster %x\n",
1137	__FUNCTION__ , process->pid , local_cxy );
1138	return NULL;
1139	}
1140
1141	// set vseg base (always aligned for ANON or REMOTE)
1142	base = vpn_base << CONFIG_PPM_PAGE_SHIFT;
1143	}
1144	else // VSEG_TYPE_DATA, VSEG_TYPE_CODE or KERNEL vseg
1145	{
1146	uint32_t vpn_min = base >> CONFIG_PPM_PAGE_SHIFT;
1147	uint32_t vpn_max = (base + size - 1) >> CONFIG_PPM_PAGE_SHIFT;
1148
1149	vpn_base = vpn_min;
1150	vpn_size = vpn_max - vpn_min + 1;
1151	}
1152
1153	// check collisions
1154	vseg = vmm_check_conflict( process , vpn_base , vpn_size );
1155
1156	if( vseg != NULL )
1157	{
1158	printk("\n[ERROR] in %s for process %x : new vseg [vpn_base %x / vpn_size %x]\n"
1159	" overlap existing vseg [vpn_base %x / vpn_size %x]\n",
1160	__FUNCTION__ , process->pid, vpn_base, vpn_size, vseg->vpn_base, vseg->vpn_size );
1161	return NULL;
1162	}
1163
1164	// allocate physical memory for vseg descriptor
1165	vseg = vseg_alloc();
1166	if( vseg == NULL )
1167	{
1168	printk("\n[ERROR] in %s for process %x : cannot allocate memory for vseg\n",
1169	__FUNCTION__ , process->pid );
1170	return NULL;
1171	}
1172
1173	#if DEBUG_VMM_CREATE_VSEG
1174	if( DEBUG_VMM_CREATE_VSEG < cycle )
1175	printk("\n[%s] thread[%x,%x] : base %x / size %x / vpn_base %x / vpn_size %x\n",
1176	__FUNCTION__, this->process->pid, this->trdid, base, size, vpn_base, vpn_size );
1177	#endif
1178
1179	// initialize vseg descriptor
1180	vseg_init( vseg,
1181	type,
1182	base,
1183	size,
1184	vpn_base,
1185	vpn_size,
1186	file_offset,
1187	file_size,
1188	mapper_xp,
1189	cxy );
1190
1191	// build extended pointer on VSL lock
1192	xptr_t lock_xp = XPTR( local_cxy , &vmm->vsl_lock );
1193
1194	// take the VSL lock in write mode
1195	remote_rwlock_wr_acquire( lock_xp );
1196
1197	// attach vseg to VSL
1198	vmm_attach_vseg_to_vsl( vmm , vseg );
1199
1200	// release the VSL lock
1201	remote_rwlock_wr_release( lock_xp );
1202
1203	#if DEBUG_VMM_CREATE_VSEG
1204	cycle = (uint32_t)hal_get_cycles();
1205	if( DEBUG_VMM_CREATE_VSEG < cycle )
1206	printk("\n[%s] thread[%x,%x] exit / %s / cxy %x / cycle %d\n",
1207	__FUNCTION__, this->process->pid, this->trdid, vseg_type_str(type), cxy, cycle );
1208	#endif
1209
1210	return vseg;
1211
1212	} // vmm_create_vseg()
1213
1214
1215	//////////////////////////////////////////
1216	void vmm_remove_vseg( process_t * process,
1217	vseg_t * vseg )
1218	{
1219	vmm_t * vmm; // local pointer on process VMM
1220	xptr_t gpt_xp; // extended pointer on GPT
1221	bool_t is_ref; // local process is reference process
1222	uint32_t vseg_type; // vseg type
1223	vpn_t vpn; // VPN of current PTE
1224	vpn_t vpn_min; // VPN of first PTE
1225	vpn_t vpn_max; // VPN of last PTE (excluded)
1226	ppn_t ppn; // current PTE ppn value
1227	uint32_t attr; // current PTE attributes
1228	xptr_t page_xp; // extended pointer on page descriptor
1229	cxy_t page_cxy; // page descriptor cluster
1230	page_t * page_ptr; // page descriptor pointer
1231	xptr_t count_xp; // extended pointer on page refcount
1232
1233	// check arguments
1234	assert( (process != NULL), "process argument is NULL" );
1235	assert( (vseg != NULL), "vseg argument is NULL" );
1236
1237	// compute is_ref
1238	is_ref = (GET_CXY( process->ref_xp ) == local_cxy);
1239
1240	// get pointers on local process VMM
1241	vmm = &process->vmm;
1242
1243	// build extended pointer on GPT
1244	gpt_xp = XPTR( local_cxy , &vmm->gpt );
1245
1246	// get relevant vseg infos
1247	vseg_type = vseg->type;
1248	vpn_min = vseg->vpn_base;
1249	vpn_max = vpn_min + vseg->vpn_size;
1250
1251	#if DEBUG_VMM_REMOVE_VSEG
1252	uint32_t cycle = (uint32_t)hal_get_cycles();
1253	thread_t * this = CURRENT_THREAD;
1254	if( DEBUG_VMM_REMOVE_VSEG < cycle )
1255	printk("\n[%s] thread[%x,%x] enter / process %x / %s / base %x / cycle %d\n",
1256	__FUNCTION__, this->process->pid, this->trdid,
1257	process->pid, vseg_type_str(vseg->type), vseg->min, cycle );
1258	#endif
1259
1260	// loop on PTEs in GPT
1261	for( vpn = vpn_min ; vpn < vpn_max ; vpn++ )
1262	{
1263	// get ppn and attr
1264	hal_gpt_get_pte( gpt_xp , vpn , &attr , &ppn );
1265
1266	if( attr & GPT_MAPPED ) // PTE is mapped
1267	{
1268
1269	#if( DEBUG_VMM_REMOVE_VSEG & 1 )
1270	if( DEBUG_VMM_REMOVE_VSEG < cycle )
1271	printk("- unmap vpn %x / ppn %x / %s" , vpn , ppn, vseg_type_str(vseg_type) );
1272	#endif
1273	// unmap GPT entry in local GPT
1274	hal_gpt_reset_pte( gpt_xp , vpn );
1275
1276	// get pointers on physical page descriptor
1277	page_xp = ppm_ppn2page( ppn );
1278	page_cxy = GET_CXY( page_xp );
1279	page_ptr = GET_PTR( page_xp );
1280
1281	// decrement page refcount
1282	count_xp = XPTR( page_cxy , &page_ptr->refcount );
1283	hal_remote_atomic_add( count_xp , -1 );
1284
1285	// compute the ppn_release condition depending on vseg type
1286	bool_t ppn_release;
1287	if( (vseg_type == VSEG_TYPE_FILE) \|\|
1288	(vseg_type == VSEG_TYPE_KCODE) \|\|
1289	(vseg_type == VSEG_TYPE_KDATA) \|\|
1290	(vseg_type == VSEG_TYPE_KDEV) )
1291	{
1292	// no physical page release for FILE and KERNEL
1293	ppn_release = false;
1294	}
1295	else if( (vseg_type == VSEG_TYPE_CODE) \|\|
1296	(vseg_type == VSEG_TYPE_STACK) )
1297	{
1298	// always release physical page for private vsegs
1299	ppn_release = true;
1300	}
1301	else if( (vseg_type == VSEG_TYPE_ANON) \|\|
1302	(vseg_type == VSEG_TYPE_REMOTE) )
1303	{
1304	// release physical page if reference cluster
1305	ppn_release = is_ref;
1306	}
1307	else if( is_ref ) // vseg_type == DATA in reference cluster
1308	{
1309	// get extended pointers on forks and lock field in page descriptor
1310	xptr_t forks_xp = XPTR( page_cxy , &page_ptr->forks );
1311	xptr_t lock_xp = XPTR( page_cxy , &page_ptr->lock );
1312
1313	// take lock protecting "forks" counter
1314	remote_busylock_acquire( lock_xp );
1315
1316	// get number of pending forks from page descriptor
1317	uint32_t forks = hal_remote_l32( forks_xp );
1318
1319	// decrement pending forks counter if required
1320	if( forks ) hal_remote_atomic_add( forks_xp , -1 );
1321
1322	// release lock protecting "forks" counter
1323	remote_busylock_release( lock_xp );
1324
1325	// release physical page if forks == 0
1326	ppn_release = (forks == 0);
1327	}
1328	else // vseg_type == DATA not in reference cluster
1329	{
1330	// no physical page release if not in reference cluster
1331	ppn_release = false;
1332	}
1333
1334	// release physical page to relevant kmem when required
1335	if( ppn_release ) ppm_remote_free_pages( page_cxy , page_ptr );
1336
1337	#if( DEBUG_VMM_REMOVE_VSEG & 1 )
1338	if( DEBUG_VMM_REMOVE_VSEG < cycle )
1339	{
1340	if( ppn_release ) printk(" / released to kmem\n" );
1341	else printk("\n");
1342	}
1343	#endif
1344	}
1345	}
1346
1347	// remove vseg from VSL
1348	vmm_detach_vseg_from_vsl( vmm , vseg );
1349
1350	// release vseg descriptor depending on vseg type
1351	if( vseg_type == VSEG_TYPE_STACK )
1352	{
1353	// release slot to local stack allocator
1354	vmm_stack_free( vmm , vseg );
1355
1356	// release vseg descriptor to local kmem
1357	vseg_free( vseg );
1358	}
1359	else if( (vseg_type == VSEG_TYPE_ANON) \|\|
1360	(vseg_type == VSEG_TYPE_FILE) \|\|
1361	(vseg_type == VSEG_TYPE_REMOTE) )
1362	{
1363	// release vseg to local mmap allocator
1364	vmm_mmap_free( vmm , vseg );
1365	}
1366	else
1367	{
1368	// release vseg descriptor to local kmem
1369	vseg_free( vseg );
1370	}
1371
1372	#if DEBUG_VMM_REMOVE_VSEG
1373	cycle = (uint32_t)hal_get_cycles();
1374	if( DEBUG_VMM_REMOVE_VSEG < cycle )
1375	printk("[%s] thread[%x,%x] exit / process %x / %s / base %x / cycle %d\n",
1376	__FUNCTION__, this->process->pid, this->trdid,
1377	process->pid, vseg_type_str(vseg->type), vseg->min, cycle );
1378	#endif
1379
1380	} // end vmm_remove_vseg()
1381
1382
1383	///////////////////////////////////
1384	void vmm_delete_vseg( pid_t pid,
1385	intptr_t vaddr )
1386	{
1387	process_t * process; // local pointer on local process
1388	vseg_t * vseg; // local pointer on local vseg containing vaddr
1389
1390	// get local pointer on local process descriptor
1391	process = cluster_get_local_process_from_pid( pid );
1392
1393	if( process == NULL )
1394	{
1395	printk("\n[WARNING] in %s : cannot get local process descriptor\n",
1396	__FUNCTION__ );
1397	return;
1398	}
1399
1400	// get local pointer on local vseg containing vaddr
1401	vseg = vmm_vseg_from_vaddr( &process->vmm , vaddr );
1402
1403	if( vseg == NULL )
1404	{
1405	printk("\n[WARNING] in %s : cannot get vseg descriptor\n",
1406	__FUNCTION__ );
1407	return;
1408	}
1409
1410	// call relevant function
1411	vmm_remove_vseg( process , vseg );
1412
1413	} // end vmm_delete_vseg
1414
1415
1416	/////////////////////////////////////////////
1417	vseg_t * vmm_vseg_from_vaddr( vmm_t * vmm,
1418	intptr_t vaddr )
1419	{
1420	xptr_t vseg_xp;
1421	vseg_t * vseg;
1422	xptr_t iter_xp;
1423
1424	// get extended pointers on VSL lock and root
1425	xptr_t lock_xp = XPTR( local_cxy , &vmm->vsl_lock );
1426	xptr_t root_xp = XPTR( local_cxy , &vmm->vsegs_root );
1427
1428	// get lock protecting the VSL
1429	remote_rwlock_rd_acquire( lock_xp );
1430
1431	// scan the list of vsegs in VSL
1432	XLIST_FOREACH( root_xp , iter_xp )
1433	{
1434	// get pointers on vseg
1435	vseg_xp = XLIST_ELEMENT( iter_xp , vseg_t , xlist );
1436	vseg = GET_PTR( vseg_xp );
1437
1438	// return success when match
1439	if( (vaddr >= vseg->min) && (vaddr < vseg->max) )
1440	{
1441	// return success
1442	remote_rwlock_rd_release( lock_xp );
1443	return vseg;
1444	}
1445	}
1446
1447	// return failure
1448	remote_rwlock_rd_release( lock_xp );
1449	return NULL;
1450
1451	} // end vmm_vseg_from_vaddr()
1452
1453	/////////////////////////////////////////////
1454	error_t vmm_resize_vseg( process_t * process,
1455	intptr_t base,
1456	intptr_t size )
1457	{
1458	error_t error;
1459	vseg_t * new;
1460	vpn_t vpn_min;
1461	vpn_t vpn_max;
1462
1463	#if DEBUG_VMM_RESIZE_VSEG
1464	uint32_t cycle = (uint32_t)hal_get_cycles();
1465	thread_t * this = CURRENT_THREAD;
1466	if( DEBUG_VMM_RESIZE_VSEG < cycle )
1467	printk("\n[%s] thread[%x,%x] enter / process %x / base %x / size %d / cycle %d\n",
1468	__FUNCTION__, this->process->pid, this->trdid, process->pid, base, size, cycle );
1469	#endif
1470
1471	// get pointer on process VMM
1472	vmm_t * vmm = &process->vmm;
1473
1474	intptr_t addr_min = base;
1475	intptr_t addr_max = base + size;
1476
1477	// get pointer on vseg
1478	vseg_t * vseg = vmm_vseg_from_vaddr( vmm , base );
1479
1480	if( vseg == NULL)
1481	{
1482	printk("\n[ERROR] in %s : vseg(%x,%d) not found\n",
1483	__FUNCTION__, base , size );
1484	return -1;
1485	}
1486
1487	// resize depends on unmapped region base and size
1488	if( (vseg->min > addr_min) \|\| (vseg->max < addr_max) ) // not included in vseg
1489	{
1490	printk("\n[ERROR] in %s : unmapped region[%x->%x[ not included in vseg[%x->%x[\n",
1491	__FUNCTION__, addr_min, addr_max, vseg->min, vseg->max );
1492
1493	error = -1;
1494	}
1495	else if( (vseg->min == addr_min) && (vseg->max == addr_max) ) // vseg must be deleted
1496	{
1497
1498	#if( DEBUG_VMM_RESIZE_VSEG & 1 )
1499	if( DEBUG_VMM_RESIZE_VSEG < cycle )
1500	printk("\n[%s] unmapped region[%x->%x[ equal vseg[%x->%x[\n",
1501	__FUNCTION__, addr_min, addr_max, vseg->min, vseg->max );
1502	#endif
1503	vmm_delete_vseg( process->pid , vseg->min );
1504
1505	#if( DEBUG_VMM_RESIZE_VSEG & 1 )
1506	if( DEBUG_VMM_RESIZE_VSEG < cycle )
1507	printk("\n[%s] thread[%x,%x] deleted vseg\n",
1508	__FUNCTION__, this->process->pid, this->trdid );
1509	#endif
1510	error = 0;
1511	}
1512	else if( vseg->min == addr_min ) // vseg must be resized
1513	{
1514
1515	#if( DEBUG_VMM_RESIZE_VSEG & 1 )
1516	if( DEBUG_VMM_RESIZE_VSEG < cycle )
1517	printk("\n[%s] unmapped region[%x->%x[ included in vseg[%x->%x[\n",
1518	__FUNCTION__, addr_min, addr_max, vseg->min, vseg->max );
1519	#endif
1520	// update vseg min address
1521	vseg->min = addr_max;
1522
1523	// update vpn_base and vpn_size
1524	vpn_min = vseg->min >> CONFIG_PPM_PAGE_SHIFT;
1525	vpn_max = (vseg->max - 1) >> CONFIG_PPM_PAGE_SHIFT;
1526	vseg->vpn_base = vpn_min;
1527	vseg->vpn_size = vpn_max - vpn_min + 1;
1528
1529	#if( DEBUG_VMM_RESIZE_VSEG & 1 )
1530	if( DEBUG_VMM_RESIZE_VSEG < cycle )
1531	printk("\n[%s] thread[%x,%x] changed vseg_min\n",
1532	__FUNCTION__, this->process->pid, this->trdid );
1533	#endif
1534	error = 0;
1535	}
1536	else if( vseg->max == addr_max ) // vseg must be resized
1537	{
1538
1539	#if( DEBUG_VMM_RESIZE_VSEG & 1 )
1540	if( DEBUG_VMM_RESIZE_VSEG < cycle )
1541	printk("\n[%s] unmapped region[%x->%x[ included in vseg[%x->%x[\n",
1542	__FUNCTION__, addr_min, addr_max, vseg->min, vseg->max );
1543	#endif
1544	// update vseg max address
1545	vseg->max = addr_min;
1546
1547	// update vpn_base and vpn_size
1548	vpn_min = vseg->min >> CONFIG_PPM_PAGE_SHIFT;
1549	vpn_max = (vseg->max - 1) >> CONFIG_PPM_PAGE_SHIFT;
1550	vseg->vpn_base = vpn_min;
1551	vseg->vpn_size = vpn_max - vpn_min + 1;
1552
1553	#if( DEBUG_VMM_RESIZE_VSEG & 1 )
1554	if( DEBUG_VMM_RESIZE_VSEG < cycle )
1555	printk("\n[%s] thread[%x,%x] changed vseg_max\n",
1556	__FUNCTION__, this->process->pid, this->trdid );
1557	#endif
1558	error = 0;
1559
1560	}
1561	else // vseg cut in three regions
1562	{
1563
1564	#if( DEBUG_VMM_RESIZE_VSEG & 1 )
1565	if( DEBUG_VMM_RESIZE_VSEG < cycle )
1566	printk("\n[%s] unmapped region[%x->%x[ included in vseg[%x->%x[\n",
1567	__FUNCTION__, addr_min, addr_max, vseg->min, vseg->max );
1568	#endif
1569	// resize existing vseg
1570	vseg->max = addr_min;
1571
1572	// update vpn_base and vpn_size
1573	vpn_min = vseg->min >> CONFIG_PPM_PAGE_SHIFT;
1574	vpn_max = (vseg->max - 1) >> CONFIG_PPM_PAGE_SHIFT;
1575	vseg->vpn_base = vpn_min;
1576	vseg->vpn_size = vpn_max - vpn_min + 1;
1577
1578	// create new vseg
1579	new = vmm_create_vseg( process,
1580	vseg->type,
1581	addr_min,
1582	(vseg->max - addr_max),
1583	vseg->file_offset,
1584	vseg->file_size,
1585	vseg->mapper_xp,
1586	vseg->cxy );
1587
1588	#if( DEBUG_VMM_RESIZE_VSEG & 1 )
1589	if( DEBUG_VMM_RESIZE_VSEG < cycle )
1590	printk("\n[%s] thread[%x,%x] replaced vseg by two smal vsegs\n",
1591	__FUNCTION__, this->process->pid, this->trdid );
1592	#endif
1593
1594	if( new == NULL ) error = -1;
1595	else error = 0;
1596	}
1597
1598	#if DEBUG_VMM_RESIZE_VSEG
1599	if( DEBUG_VMM_RESIZE_VSEG < cycle )
1600	printk("\n[%s] thread[%x,%x] exit / process %x / base %x / size %d / cycle %d\n",
1601	__FUNCTION__, this->process->pid, this->trdid, process->pid, base, size, cycle );
1602	#endif
1603
1604	return error;
1605
1606	} // vmm_resize_vseg()
1607
1608	///////////////////////////////////////////
1609	error_t vmm_get_vseg( process_t * process,
1610	intptr_t vaddr,
1611	vseg_t ** found_vseg )
1612	{
1613	xptr_t vseg_xp;
1614	vseg_t * vseg;
1615	vmm_t * vmm;
1616	error_t error;
1617
1618	// get pointer on local VMM
1619	vmm = &process->vmm;
1620
1621	// try to get vseg from local VMM
1622	vseg = vmm_vseg_from_vaddr( vmm , vaddr );
1623
1624	if( vseg == NULL ) // vseg not found in local cluster => try to get it from ref
1625	{
1626	// get extended pointer on reference process
1627	xptr_t ref_xp = process->ref_xp;
1628
1629	// get cluster and local pointer on reference process
1630	cxy_t ref_cxy = GET_CXY( ref_xp );
1631	process_t * ref_ptr = GET_PTR( ref_xp );
1632
1633	if( local_cxy == ref_cxy ) return -1; // local cluster is the reference
1634
1635	// get extended pointer on reference vseg
1636	rpc_vmm_get_vseg_client( ref_cxy , ref_ptr , vaddr , &vseg_xp , &error );
1637
1638	if( error ) return -1; // vseg not found => illegal user vaddr
1639
1640	// allocate a vseg in local cluster
1641	vseg = vseg_alloc();
1642
1643	if( vseg == NULL ) return -1; // cannot allocate a local vseg
1644
1645	// initialise local vseg from reference
1646	vseg_init_from_ref( vseg , vseg_xp );
1647
1648	// build extended pointer on VSL lock
1649	xptr_t lock_xp = XPTR( local_cxy , &vmm->vsl_lock );
1650
1651	// take the VSL lock in write mode
1652	remote_rwlock_wr_acquire( lock_xp );
1653
1654	// register local vseg in local VSL
1655	vmm_attach_vseg_to_vsl( vmm , vseg );
1656
1657	// release the VSL lock
1658	remote_rwlock_wr_release( lock_xp );
1659	}
1660
1661	// success
1662	*found_vseg = vseg;
1663	return 0;
1664
1665	} // end vmm_get_vseg()
1666
1667	//////////////////////////////////////////////////////////////////////////////////////
1668	// This static function compute the target cluster to allocate a physical page
1669	// for a given <vpn> in a given <vseg>, allocates the page and returns an extended
1670	// pointer on the allocated page descriptor.
1671	// The vseg cannot have the FILE type.
1672	//////////////////////////////////////////////////////////////////////////////////////
1673	static xptr_t vmm_page_allocate( vseg_t * vseg,
1674	vpn_t vpn )
1675	{
1676
1677	#if DEBUG_VMM_PAGE_ALLOCATE
1678	uint32_t cycle = (uint32_t)hal_get_cycles();
1679	thread_t * this = CURRENT_THREAD;
1680	if( DEBUG_VMM_PAGE_ALLOCATE < cycle )
1681	printk("\n[%s] thread[%x,%x] enter for vpn %x / cycle %d\n",
1682	__FUNCTION__ , this->process->pid, this->trdid, vpn, cycle );
1683	#endif
1684
1685	xptr_t page_xp;
1686	cxy_t page_cxy;
1687	uint32_t index;
1688
1689	uint32_t type = vseg->type;
1690	uint32_t flags = vseg->flags;
1691	uint32_t x_size = LOCAL_CLUSTER->x_size;
1692	uint32_t y_size = LOCAL_CLUSTER->y_size;
1693
1694	// check vseg type
1695	assert( ( type != VSEG_TYPE_FILE ) , "illegal vseg type\n" );
1696
1697	if( flags & VSEG_DISTRIB ) // distributed => cxy depends on vpn LSB
1698	{
1699	index = vpn & ((x_size * y_size) - 1);
1700	page_cxy = HAL_CXY_FROM_XY( (index / y_size) , (index % y_size) );
1701
1702	// If the cluster selected from VPN's LSBs is empty, we select one randomly
1703	if ( cluster_is_active( page_cxy ) == false )
1704	{
1705	page_cxy = cluster_random_select();
1706	}
1707	}
1708	else // other cases => cxy specified in vseg
1709	{
1710	page_cxy = vseg->cxy;
1711	}
1712
1713	// allocate a 4 Kbytes physical page from target cluster
1714	page_xp = ppm_remote_alloc_pages( page_cxy , 0 );
1715
1716	#if DEBUG_VMM_PAGE_ALLOCATE
1717	cycle = (uint32_t)hal_get_cycles();
1718	if( DEBUG_VMM_PAGE_ALLOCATE < cycle )
1719	printk("\n[%s] thread[%x,%x] exit for vpn %x / ppn %x / cluster %x / cycle %d\n",
1720	__FUNCTION__ , this->process->pid, this->trdid, vpn, ppm_page2ppn(page_xp), page_cxy, cycle );
1721	#endif
1722
1723	return page_xp;
1724
1725	} // end vmm_page_allocate()
1726
1727	////////////////////////////////////////
1728	error_t vmm_get_one_ppn( vseg_t * vseg,
1729	vpn_t vpn,
1730	ppn_t * ppn )
1731	{
1732	error_t error;
1733	xptr_t page_xp; // extended pointer on physical page descriptor
1734	uint32_t page_id; // missing page index in vseg mapper
1735	uint32_t type; // vseg type;
1736
1737	type = vseg->type;
1738	page_id = vpn - vseg->vpn_base;
1739
1740	#if DEBUG_VMM_GET_ONE_PPN
1741	uint32_t cycle = (uint32_t)hal_get_cycles();
1742	thread_t * this = CURRENT_THREAD;
1743	// if( DEBUG_VMM_GET_ONE_PPN < cycle )
1744	if( vpn == 0x40B )
1745	printk("\n[%s] thread[%x,%x] enter for vpn %x / type %s / page_id %d / cycle %d\n",
1746	__FUNCTION__, this->process->pid, this->trdid, vpn, vseg_type_str(type), page_id, cycle );
1747	#endif
1748
1749	// FILE type : get the physical page from the file mapper
1750	if( type == VSEG_TYPE_FILE )
1751	{
1752	// get extended pointer on mapper
1753	xptr_t mapper_xp = vseg->mapper_xp;
1754
1755	assert( (mapper_xp != XPTR_NULL),
1756	"mapper not defined for a FILE vseg\n" );
1757
1758	// get extended pointer on page descriptor
1759	page_xp = mapper_remote_get_page( mapper_xp , page_id );
1760
1761	if ( page_xp == XPTR_NULL ) return EINVAL;
1762	}
1763
1764	// Other types : allocate a physical page from target cluster,
1765	// as defined by vseg type and vpn value
1766	else
1767	{
1768	// allocate one physical page
1769	page_xp = vmm_page_allocate( vseg , vpn );
1770
1771	if( page_xp == XPTR_NULL ) return ENOMEM;
1772
1773	// initialise missing page from .elf file mapper for DATA and CODE types
1774	// the vseg->mapper_xp field is an extended pointer on the .elf file mapper
1775	if( (type == VSEG_TYPE_CODE) \|\| (type == VSEG_TYPE_DATA) )
1776	{
1777	// get extended pointer on mapper
1778	xptr_t mapper_xp = vseg->mapper_xp;
1779
1780	assert( (mapper_xp != XPTR_NULL),
1781	"mapper not defined for a CODE or DATA vseg\n" );
1782
1783	// compute missing page offset in vseg
1784	uint32_t offset = page_id << CONFIG_PPM_PAGE_SHIFT;
1785
1786	// compute missing page offset in .elf file
1787	uint32_t elf_offset = vseg->file_offset + offset;
1788
1789	#if (DEBUG_VMM_GET_ONE_PPN & 0x1)
1790	// if( DEBUG_VMM_GET_ONE_PPN < cycle )
1791	if( vpn == 0x40B )
1792	printk("\n[%s] thread[%x,%x] for vpn = %x / elf_offset = %x\n",
1793	__FUNCTION__, this->process->pid, this->trdid, vpn, elf_offset );
1794	#endif
1795	// compute extended pointer on page base
1796	xptr_t base_xp = ppm_page2base( page_xp );
1797
1798	// file_size (in .elf mapper) can be smaller than vseg_size (BSS)
1799	uint32_t file_size = vseg->file_size;
1800
1801	if( file_size < offset ) // missing page fully in BSS
1802	{
1803
1804	#if (DEBUG_VMM_GET_ONE_PPN & 0x1)
1805	// if( DEBUG_VMM_GET_ONE_PPN < cycle )
1806	if( vpn == 0x40B )
1807	printk("\n[%s] thread[%x,%x] for vpn %x / fully in BSS\n",
1808	__FUNCTION__, this->process->pid, this->trdid, vpn );
1809	#endif
1810	if( GET_CXY( page_xp ) == local_cxy )
1811	{
1812	memset( GET_PTR( base_xp ) , 0 , CONFIG_PPM_PAGE_SIZE );
1813	}
1814	else
1815	{
1816	hal_remote_memset( base_xp , 0 , CONFIG_PPM_PAGE_SIZE );
1817	}
1818	}
1819	else if( file_size >= (offset + CONFIG_PPM_PAGE_SIZE) ) // fully in mapper
1820	{
1821
1822	#if (DEBUG_VMM_GET_ONE_PPN & 0x1)
1823	// if( DEBUG_VMM_GET_ONE_PPN < cycle )
1824	if( vpn == 0x40B )
1825	printk("\n[%s] thread[%x,%x] for vpn %x / fully in mapper\n",
1826	__FUNCTION__, this->process->pid, this->trdid, vpn );
1827	#endif
1828	error = mapper_move_kernel( mapper_xp,
1829	true, // to_buffer
1830	elf_offset,
1831	base_xp,
1832	CONFIG_PPM_PAGE_SIZE );
1833	if( error ) return EINVAL;
1834	}
1835	else // both in mapper and in BSS :
1836	// - (file_size - offset) bytes from mapper
1837	// - (page_size + offset - file_size) bytes from BSS
1838	{
1839
1840	#if (DEBUG_VMM_GET_ONE_PPN & 0x1)
1841	// if( DEBUG_VMM_GET_ONE_PPN < cycle )
1842	if( vpn == 0x40B )
1843	printk("\n[%s] thread[%x,%x] for vpn %x / both mapper & BSS\n"
1844	" %d bytes from mapper / %d bytes from BSS\n",
1845	__FUNCTION__, this->process->pid, this->trdid, vpn,
1846	file_size - offset , offset + CONFIG_PPM_PAGE_SIZE - file_size );
1847	#endif
1848	// initialize mapper part
1849	error = mapper_move_kernel( mapper_xp,
1850	true, // to buffer
1851	elf_offset,
1852	base_xp,
1853	file_size - offset );
1854	if( error ) return EINVAL;
1855
1856	// initialize BSS part
1857	if( GET_CXY( page_xp ) == local_cxy )
1858	{
1859	memset( GET_PTR( base_xp ) + file_size - offset , 0 ,
1860	offset + CONFIG_PPM_PAGE_SIZE - file_size );
1861	}
1862	else
1863	{
1864	hal_remote_memset( base_xp + file_size - offset , 0 ,
1865	offset + CONFIG_PPM_PAGE_SIZE - file_size );
1866	}
1867	}
1868	} // end initialisation for CODE or DATA types
1869	}
1870
1871	// return ppn
1872	*ppn = ppm_page2ppn( page_xp );
1873
1874	#if DEBUG_VMM_GET_ONE_PPN
1875	cycle = (uint32_t)hal_get_cycles();
1876	// if( DEBUG_VMM_GET_ONE_PPN < cycle )
1877	if( vpn == 0x40B )
1878	printk("\n[%s] thread[%x,%x] exit for vpn %x / ppn %x / cycle\n",
1879	__FUNCTION__ , this->process->pid, this->trdid , vpn , *ppn, cycle );
1880	#endif
1881
1882	return 0;
1883
1884	} // end vmm_get_one_ppn()
1885
1886	///////////////////////////////////////////////////
1887	error_t vmm_handle_page_fault( process_t * process,
1888	vpn_t vpn )
1889	{
1890	vseg_t * vseg; // vseg containing vpn
1891	uint32_t attr; // PTE_ATTR value
1892	ppn_t ppn; // PTE_PPN value
1893	uint32_t ref_attr; // PTE_ATTR value in reference GPT
1894	ppn_t ref_ppn; // PTE_PPN value in reference GPT
1895	cxy_t ref_cxy; // reference cluster for missing vpn
1896	process_t * ref_ptr; // reference process for missing vpn
1897	xptr_t local_gpt_xp; // extended pointer on local GPT
1898	xptr_t ref_gpt_xp; // extended pointer on reference GPT
1899	error_t error; // value returned by called functions
1900
1901	thread_t * this = CURRENT_THREAD;
1902
1903	#if (CONFIG_INSTRUMENTATION_PGFAULTS \|\| DEBUG_VMM_HANDLE_PAGE_FAULT)
1904	uint32_t start_cycle = (uint32_t)hal_get_cycles();
1905	#endif
1906
1907	#if DEBUG_VMM_HANDLE_PAGE_FAULT
1908	if( vpn == 0x40b )
1909	printk("\n[%s] thread[%x,%x] enter for vpn %x / cycle %d\n",
1910	__FUNCTION__, this->process->pid, this->trdid, vpn, start_cycle );
1911	#endif
1912
1913	#if (DEBUG_VMM_HANDLE_PAGE_FAULT & 1)
1914	hal_vmm_display( this->process , false );
1915	#endif
1916
1917	// get local vseg (access to reference VSL can be required)
1918	error = vmm_get_vseg( process,
1919	(intptr_t)vpn<<CONFIG_PPM_PAGE_SHIFT,
1920	&vseg );
1921	if( error )
1922	{
1923	printk("\n[ERROR] in %s : vpn %x in thread[%x,%x] not in registered vseg\n",
1924	__FUNCTION__ , vpn , process->pid, this->trdid );
1925
1926	return EXCP_USER_ERROR;
1927	}
1928
1929	#if DEBUG_VMM_HANDLE_PAGE_FAULT
1930	uint32_t cycle = (uint32_t)hal_get_cycles();
1931	if( vpn == 0x40b )
1932	printk("\n[%s] thread[%x,%x] found vseg %s / cycle %d\n",
1933	__FUNCTION__, this->process->pid, this->trdid, vseg_type_str(vseg->type), cycle );
1934	#endif
1935
1936	// build extended pointer on local GPT
1937	local_gpt_xp = XPTR( local_cxy , &process->vmm.gpt );
1938
1939	// lock PTE in local GPT and get current PPN and attributes
1940	error = hal_gpt_lock_pte( local_gpt_xp,
1941	vpn,
1942	&attr,
1943	&ppn );
1944	if( error )
1945	{
1946	printk("\n[PANIC] in %s : cannot lock PTE in local GPT / vpn %x / process %x\n",
1947	__FUNCTION__ , vpn , process->pid );
1948
1949	return EXCP_KERNEL_PANIC;
1950	}
1951
1952	#if DEBUG_VMM_HANDLE_PAGE_FAULT
1953	cycle = (uint32_t)hal_get_cycles();
1954	if( vpn == 0x40b )
1955	printk("\n[%s] thread[%x,%x] locked vpn %x in cluster %x / cycle %d\n",
1956	__FUNCTION__, this->process->pid, this->trdid, vpn, local_cxy, cycle );
1957	#endif
1958
1959	// handle page fault only if local PTE still unmapped after lock
1960	if( (attr & GPT_MAPPED) == 0 )
1961	{
1962	// get reference process cluster and local pointer
1963	ref_cxy = GET_CXY( process->ref_xp );
1964	ref_ptr = GET_PTR( process->ref_xp );
1965
1966	/////////////// private vseg or (local == reference)
1967	/////////////// => access only the local GPT
1968	if( (vseg->type == VSEG_TYPE_STACK) \|\|
1969	(vseg->type == VSEG_TYPE_CODE) \|\|
1970	(ref_cxy == local_cxy ) )
1971	{
1972
1973	#if DEBUG_VMM_HANDLE_PAGE_FAULT
1974	if( vpn == 0x40b )
1975	printk("\n[%s] thread[%x,%x] : access local gpt : local_cxy %x / ref_cxy %x / type %s\n",
1976	__FUNCTION__, this->process->pid, this->trdid, local_cxy, ref_cxy, vseg_type_str(vseg->type) );
1977	#endif
1978	// allocate and initialise a physical page
1979	error = vmm_get_one_ppn( vseg , vpn , &ppn );
1980
1981	if( error )
1982	{
1983	printk("\n[ERROR] in %s : no physical page / process = %x / vpn = %x\n",
1984	__FUNCTION__ , process->pid , vpn );
1985
1986	// unlock PTE in local GPT
1987	hal_gpt_unlock_pte( local_gpt_xp , vpn );
1988
1989	return EXCP_KERNEL_PANIC;
1990	}
1991
1992	// define attr from vseg flags
1993	attr = GPT_MAPPED \| GPT_SMALL \| GPT_READABLE;
1994	if( vseg->flags & VSEG_USER ) attr \|= GPT_USER;
1995	if( vseg->flags & VSEG_WRITE ) attr \|= GPT_WRITABLE;
1996	if( vseg->flags & VSEG_EXEC ) attr \|= GPT_EXECUTABLE;
1997	if( vseg->flags & VSEG_CACHE ) attr \|= GPT_CACHABLE;
1998
1999	// set PTE to local GPT
2000	// it unlocks this PTE
2001	hal_gpt_set_pte( local_gpt_xp,
2002	vpn,
2003	attr,
2004	ppn );
2005
2006	#if (CONFIG_INSTRUMENTATION_PGFAULTS \|\| DEBUG_VMM_HANDLE_PAGE_FAULT)
2007	uint32_t end_cycle = (uint32_t)hal_get_cycles();
2008	#endif
2009
2010	#if DEBUG_VMM_HANDLE_PAGE_FAULT
2011	if( vpn == 0x40b )
2012	printk("\n[%s] thread[%x,%x] handled local pgfault / ppn %x / attr %x / cycle %d\n",
2013	__FUNCTION__, this->process->pid, this->trdid, ppn, attr, end_cycle );
2014	#endif
2015
2016	#if CONFIG_INSTRUMENTATION_PGFAULTS
2017	this->info.local_pgfault_nr++;
2018	this->info.local_pgfault_cost += (end_cycle - start_cycle);
2019	#endif
2020	return EXCP_NON_FATAL;
2021
2022	} // end local GPT access
2023
2024	/////////////////// public vseg and (local != reference)
2025	/////////////////// => access ref GPT to update local GPT
2026	else
2027	{
2028
2029	#if DEBUG_VMM_HANDLE_PAGE_FAULT
2030	if( vpn == 0x40b )
2031	printk("\n[%s] thread[%x,%x] access ref gpt : local_cxy %x / ref_cxy %x / type %s\n",
2032	__FUNCTION__, this->process->pid, this->trdid, local_cxy, ref_cxy, vseg_type_str(vseg->type) );
2033	#endif
2034	// build extended pointer on reference GPT
2035	ref_gpt_xp = XPTR( ref_cxy , &ref_ptr->vmm.gpt );
2036
2037	// lock PTE in reference GPT and get current PPN and attributes
2038	error = hal_gpt_lock_pte( ref_gpt_xp,
2039	vpn,
2040	&ref_attr,
2041	&ref_ppn );
2042	if( error )
2043	{
2044	printk("\n[PANIC] in %s : cannot lock PTE in ref GPT / vpn %x / process %x\n",
2045	__FUNCTION__ , vpn , process->pid );
2046
2047	// unlock PTE in local GPT
2048	hal_gpt_unlock_pte( local_gpt_xp , vpn );
2049
2050	return EXCP_KERNEL_PANIC;
2051	}
2052
2053	#if DEBUG_VMM_HANDLE_PAGE_FAULT
2054	if( vpn == 0x40b )
2055	printk("\n[%s] thread[%x,%x] get pte from ref gpt / attr %x / ppn %x\n",
2056	__FUNCTION__, this->process->pid, this->trdid, ref_attr, ref_ppn );
2057	#endif
2058
2059	if( ref_attr & GPT_MAPPED ) // false page fault
2060	{
2061	// update local GPT from reference GPT values
2062	// this unlocks the PTE in local GPT
2063	hal_gpt_set_pte( local_gpt_xp,
2064	vpn,
2065	ref_attr,
2066	ref_ppn );
2067
2068	#if DEBUG_VMM_HANDLE_PAGE_FAULT
2069	if( vpn == 0x40b )
2070	printk("\n[%s] thread[%x,%x] updated local gpt for a false pgfault\n",
2071	__FUNCTION__, this->process->pid, this->trdid );
2072	#endif
2073
2074	// unlock the PTE in reference GPT
2075	hal_gpt_unlock_pte( ref_gpt_xp, vpn );
2076
2077	#if DEBUG_VMM_HANDLE_PAGE_FAULT
2078	if( vpn == 0x40b )
2079	printk("\n[%s] thread[%x,%x] unlock the ref gpt after a false pgfault\n",
2080	__FUNCTION__, this->process->pid, this->trdid );
2081	#endif
2082
2083	#if (CONFIG_INSTRUMENTATION_PGFAULTS \|\| DEBUG_VMM_HANDLE_PAGE_FAULT)
2084	uint32_t end_cycle = (uint32_t)hal_get_cycles();
2085	#endif
2086
2087	#if DEBUG_VMM_HANDLE_PAGE_FAULT
2088	if( vpn == 0x40b )
2089	printk("\n[%s] thread[%x,%x] handled false pgfault / ppn %x / attr %x / cycle %d\n",
2090	__FUNCTION__, this->process->pid, this->trdid, ref_ppn, ref_attr, end_cycle );
2091	#endif
2092
2093	#if CONFIG_INSTRUMENTATION_PGFAULTS
2094	this->info.false_pgfault_nr++;
2095	this->info.false_pgfault_cost += (end_cycle - start_cycle);
2096	#endif
2097	return EXCP_NON_FATAL;
2098	}
2099	else // true page fault
2100	{
2101	// allocate and initialise a physical page depending on the vseg type
2102	error = vmm_get_one_ppn( vseg , vpn , &ppn );
2103
2104	if( error )
2105	{
2106	printk("\n[ERROR] in %s : no memory / process = %x / vpn = %x\n",
2107	__FUNCTION__ , process->pid , vpn );
2108
2109	// unlock PTE in local GPT and in reference GPT
2110	hal_gpt_unlock_pte( local_gpt_xp , vpn );
2111	hal_gpt_unlock_pte( ref_gpt_xp , vpn );
2112
2113	return EXCP_KERNEL_PANIC;
2114	}
2115
2116	// define attr from vseg flags
2117	attr = GPT_MAPPED \| GPT_SMALL \| GPT_READABLE;
2118	if( vseg->flags & VSEG_USER ) attr \|= GPT_USER;
2119	if( vseg->flags & VSEG_WRITE ) attr \|= GPT_WRITABLE;
2120	if( vseg->flags & VSEG_EXEC ) attr \|= GPT_EXECUTABLE;
2121	if( vseg->flags & VSEG_CACHE ) attr \|= GPT_CACHABLE;
2122
2123	#if DEBUG_VMM_HANDLE_PAGE_FAULT
2124	if( vpn == 0x40b )
2125	printk("\n[%s] thread[%x,%x] build a new PTE for a true pgfault\n",
2126	__FUNCTION__, this->process->pid, this->trdid );
2127	#endif
2128	// set PTE in reference GPT
2129	// this unlock the PTE
2130	hal_gpt_set_pte( ref_gpt_xp,
2131	vpn,
2132	attr,
2133	ppn );
2134
2135	#if DEBUG_VMM_HANDLE_PAGE_FAULT
2136	if( vpn == 0x40b )
2137	printk("\n[%s] thread[%x,%x] set new PTE in ref gpt for a true page fault\n",
2138	__FUNCTION__, this->process->pid, this->trdid );
2139	#endif
2140
2141	// set PTE in local GPT
2142	// this unlock the PTE
2143	hal_gpt_set_pte( local_gpt_xp,
2144	vpn,
2145	attr,
2146	ppn );
2147
2148	#if (CONFIG_INSTRUMENTATION_PGFAULTS \|\| DEBUG_VMM_HANDLE_PAGE_FAULT)
2149	uint32_t end_cycle = (uint32_t)hal_get_cycles();
2150	#endif
2151
2152	#if DEBUG_VMM_HANDLE_PAGE_FAULT
2153	if( vpn == 0x40b )
2154	printk("\n[%s] thread[%x,%x] handled global pgfault / ppn %x / attr %x / cycle %d\n",
2155	__FUNCTION__, this->process->pid, this->trdid, ppn, attr, end_cycle );
2156	#endif
2157
2158	#if CONFIG_INSTRUMENTATION_PGFAULTS
2159	this->info.global_pgfault_nr++;
2160	this->info.global_pgfault_cost += (end_cycle - start_cycle);
2161	#endif
2162	return EXCP_NON_FATAL;
2163	}
2164	}
2165	}
2166	else // page has been locally mapped by another concurrent thread
2167	{
2168	// unlock the PTE in local GPT
2169	hal_gpt_unlock_pte( local_gpt_xp , vpn );
2170
2171	#if (CONFIG_INSTRUMENTATION_PGFAULTS \|\| DEBUG_VMM_HANDLE_PAGE_FAULT)
2172	uint32_t end_cycle = (uint32_t)hal_get_cycles();
2173	#endif
2174
2175	#if DEBUG_VMM_HANDLE_PAGE_FAULT
2176	if( vpn == 0x40b )
2177	printk("\n[%s] handled by another thread / vpn %x / ppn %x / attr %x / cycle %d\n",
2178	__FUNCTION__, vpn, ppn, attr, end_cycle );
2179	#endif
2180
2181	#if CONFIG_INSTRUMENTATION_PGFAULTS
2182	this->info.false_pgfault_nr++;
2183	this->info.false_pgfault_cost += (end_cycle - start_cycle);
2184	#endif
2185	return EXCP_NON_FATAL;
2186	}
2187
2188	} // end vmm_handle_page_fault()
2189
2190	////////////////////////////////////////////
2191	error_t vmm_handle_cow( process_t * process,
2192	vpn_t vpn )
2193	{
2194	vseg_t * vseg; // vseg containing vpn
2195	xptr_t gpt_xp; // extended pointer on GPT (local or reference)
2196	gpt_t * gpt_ptr; // local pointer on GPT (local or reference)
2197	cxy_t gpt_cxy; // GPT cluster identifier
2198	uint32_t old_attr; // current PTE_ATTR value
2199	ppn_t old_ppn; // current PTE_PPN value
2200	uint32_t new_attr; // new PTE_ATTR value
2201	ppn_t new_ppn; // new PTE_PPN value
2202	cxy_t ref_cxy; // reference process cluster
2203	process_t * ref_ptr; // local pointer on reference process
2204	error_t error;
2205
2206	thread_t * this = CURRENT_THREAD;
2207
2208	#if DEBUG_VMM_HANDLE_COW
2209	uint32_t cycle = (uint32_t)hal_get_cycles();
2210	if( DEBUG_VMM_HANDLE_COW < cycle )
2211	printk("\n[%s] thread[%x,%x] enter for vpn %x / core[%x,%d] / cycle %d\n",
2212	__FUNCTION__, this->process->pid, this->trdid, vpn, local_cxy, this->core->lid, cycle );
2213	#endif
2214
2215	#if (DEBUG_VMM_HANDLE_PAGE_FAULT & 1)
2216	hal_vmm_display( process , true );
2217	#endif
2218
2219	// get local vseg
2220	error = vmm_get_vseg( process,
2221	(intptr_t)vpn<<CONFIG_PPM_PAGE_SHIFT,
2222	&vseg );
2223	if( error )
2224	{
2225	printk("\n[ERROR] in %s : vpn %x in thread[%x,%x] not in a registered vseg\n",
2226	__FUNCTION__, vpn, process->pid, this->trdid );
2227
2228	return EXCP_USER_ERROR;
2229	}
2230
2231	#if DEBUG_VMM_HANDLE_COW
2232	if( DEBUG_VMM_HANDLE_COW < cycle )
2233	printk("\n[%s] thread[%x,%x] get vseg %s\n",
2234	__FUNCTION__, this->process->pid, this->trdid, vseg_type_str(vseg->type) );
2235	#endif
2236
2237	// get reference process cluster and local pointer
2238	ref_cxy = GET_CXY( process->ref_xp );
2239	ref_ptr = GET_PTR( process->ref_xp );
2240
2241	// build pointers on relevant GPT
2242	// - access only local GPT for a private vseg
2243	// - access reference GPT and all copies for a public vseg
2244	if( (vseg->type == VSEG_TYPE_STACK) \|\| (vseg->type == VSEG_TYPE_CODE) )
2245	{
2246	gpt_cxy = local_cxy;
2247	gpt_ptr = &process->vmm.gpt;
2248	gpt_xp = XPTR( gpt_cxy , gpt_ptr );
2249	}
2250	else
2251	{
2252	gpt_cxy = ref_cxy;
2253	gpt_ptr = &ref_ptr->vmm.gpt;
2254	gpt_xp = XPTR( gpt_cxy , gpt_ptr );
2255	}
2256
2257	// lock target PTE in relevant GPT (local or reference)
2258	// and get current PTE value
2259	error = hal_gpt_lock_pte( gpt_xp,
2260	vpn,
2261	&old_attr,
2262	&old_ppn );
2263	if( error )
2264	{
2265	printk("\n[PANIC] in %s : cannot lock PTE in GPT / cxy %x / vpn %x / process %x\n",
2266	__FUNCTION__ , gpt_cxy, vpn , process->pid );
2267
2268	return EXCP_KERNEL_PANIC;
2269	}
2270
2271	#if DEBUG_VMM_HANDLE_COW
2272	if( DEBUG_VMM_HANDLE_COW < cycle )
2273	printk("\n[%s] thread[%x,%x] get pte for vpn %x : ppn %x / attr %x\n",
2274	__FUNCTION__, this->process->pid, this->trdid, vpn, old_ppn, old_attr );
2275	#endif
2276
2277	// return user error if COW attribute not set or PTE2 unmapped
2278	if( ((old_attr & GPT_COW) == 0) \|\| ((old_attr & GPT_MAPPED) == 0) )
2279	{
2280	hal_gpt_unlock_pte( gpt_xp , vpn );
2281
2282	return EXCP_USER_ERROR;
2283	}
2284
2285	// get pointers on physical page descriptor
2286	xptr_t page_xp = ppm_ppn2page( old_ppn );
2287	cxy_t page_cxy = GET_CXY( page_xp );
2288	page_t * page_ptr = GET_PTR( page_xp );
2289
2290	// get extended pointers on forks and lock field in page descriptor
2291	xptr_t forks_xp = XPTR( page_cxy , &page_ptr->forks );
2292	xptr_t forks_lock_xp = XPTR( page_cxy , &page_ptr->lock );
2293
2294	// take lock protecting "forks" counter
2295	remote_busylock_acquire( forks_lock_xp );
2296
2297	// get number of pending forks from page descriptor
2298	uint32_t forks = hal_remote_l32( forks_xp );
2299
2300	#if DEBUG_VMM_HANDLE_COW
2301	if( DEBUG_VMM_HANDLE_COW < cycle )
2302	printk("\n[%s] thread[%x,%x] get forks = %d for vpn %x\n",
2303	__FUNCTION__, this->process->pid, this->trdid, forks, vpn );
2304	#endif
2305
2306	if( forks ) // pending fork => allocate a new page, and copy old to new
2307	{
2308	// decrement pending forks counter in page descriptor
2309	hal_remote_atomic_add( forks_xp , -1 );
2310
2311	// release lock protecting "forks" counter
2312	remote_busylock_release( forks_lock_xp );
2313
2314	// allocate a new physical page depending on vseg type
2315	page_xp = vmm_page_allocate( vseg , vpn );
2316
2317	if( page_xp == XPTR_NULL )
2318	{
2319	printk("\n[PANIC] in %s : no memory for vpn %x in process %x\n",
2320	__FUNCTION__ , vpn, process->pid );
2321
2322	hal_gpt_unlock_pte( gpt_xp , vpn );
2323
2324	return EXCP_KERNEL_PANIC;
2325	}
2326
2327	// compute allocated page PPN
2328	new_ppn = ppm_page2ppn( page_xp );
2329
2330	#if DEBUG_VMM_HANDLE_COW
2331	if( DEBUG_VMM_HANDLE_COW < cycle )
2332	printk("\n[%s] thread[%x,%x] get new ppn %x for vpn %x\n",
2333	__FUNCTION__, this->process->pid, this->trdid, new_ppn, vpn );
2334	#endif
2335
2336	// copy old page content to new page
2337	hal_remote_memcpy( ppm_ppn2base( new_ppn ),
2338	ppm_ppn2base( old_ppn ),
2339	CONFIG_PPM_PAGE_SIZE );
2340
2341	#if DEBUG_VMM_HANDLE_COW
2342	if( DEBUG_VMM_HANDLE_COW < cycle )
2343	printk("\n[%s] thread[%x,%x] copied old page to new page\n",
2344	__FUNCTION__, this->process->pid, this->trdid );
2345	#endif
2346
2347	}
2348	else // no pending fork => keep the existing page
2349	{
2350	// release lock protecting "forks" counter
2351	remote_busylock_release( forks_lock_xp );
2352
2353	#if(DEBUG_VMM_HANDLE_COW & 1)
2354	if( DEBUG_VMM_HANDLE_COW < cycle )
2355	printk("\n[%s] thread[%x,%x] no pending forks / keep existing PPN %x\n",
2356	__FUNCTION__, this->process->pid, this->trdid, old_ppn );
2357	#endif
2358	new_ppn = old_ppn;
2359	}
2360
2361	// build new_attr : set WRITABLE, reset COW, reset LOCKED
2362	new_attr = (((old_attr \| GPT_WRITABLE) & (~GPT_COW)) & (~GPT_LOCKED));
2363
2364	// update the relevant GPT(s)
2365	// - private vseg => update only the local GPT
2366	// - public vseg => update the reference GPT AND all the GPT copies
2367	if( (vseg->type == VSEG_TYPE_STACK) \|\| (vseg->type == VSEG_TYPE_CODE) )
2368	{
2369	// set the new PTE2
2370	hal_gpt_set_pte( gpt_xp,
2371	vpn,
2372	new_attr,
2373	new_ppn );
2374	}
2375	else
2376	{
2377	if( ref_cxy == local_cxy ) // reference cluster is local
2378	{
2379	vmm_global_update_pte( process,
2380	vpn,
2381	new_attr,
2382	new_ppn );
2383	}
2384	else // reference cluster is remote
2385	{
2386	rpc_vmm_global_update_pte_client( ref_cxy,
2387	ref_ptr,
2388	vpn,
2389	new_attr,
2390	new_ppn );
2391	}
2392	}
2393
2394	#if DEBUG_VMM_HANDLE_COW
2395	cycle = (uint32_t)hal_get_cycles();
2396	if( DEBUG_VMM_HANDLE_COW < cycle )
2397	printk("\n[%s] thread[%x,%x] exit for vpn %x / core[%x,%d] / cycle %d\n",
2398	__FUNCTION__, this->process->pid, this->trdid, vpn, local_cxy, this->core->lid, cycle );
2399	#endif
2400
2401	return EXCP_NON_FATAL;
2402
2403	} // end vmm_handle_cow()
2404

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