source: trunk/hal/tsar_mips32/core/hal_vmm.c @ 629

Last change on this file since 629 was 629, checked in by alain, 18 months ago

Remove the "giant" rwlock protecting the GPT, and
use the GPT_LOCKED attribute in each PTE to prevent
concurrent modifications of one GPT entry.
The version number has been incremented to 2.1.

File size: 9.7 KB
Line 
1/*
2 * hal_vmm.c - Virtual Memory Manager Initialisation for TSAR
3 *
4 * Authors  Alain Greiner (2016,2017,2018,2019)
5 *
6 * Copyright (c) UPMC Sorbonne Universites
7 *
8 * This file is part of ALMOS-MKH.
9 *
10 * ALMOS-MKH is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; version 2.0 of the License.
13 *
14 * ALMOS-MKH is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24#include <kernel_config.h>
25#include <hal_kernel_types.h>
26#include <hal_vmm.h>
27#include <hal_gpt.h>
28#include <process.h>
29#include <thread.h>
30#include <vseg.h>
31#include <xlist.h>
32#include <vmm.h>
33#include <remote_rwlock.h>
34
35//////////////////////////////////////////////////////////////////////////////////////////
36// This file contains the TSAR specific code used to initialize the kernel process VMM,
37// or to update an user process VMM with informations related to the kernel vsegs.
38// As the TSAR architure does not use the DATA MMU, but use only the DATA extension
39// address register to access local and remote kernel data, the kernel VSL contains only
40// one "kcode" segment, and the kernel GPT contains only one big page in PT1[0] slot.
41//////////////////////////////////////////////////////////////////////////////////////////
42
43// extern global variables
44extern process_t            process_zero;
45extern chdev_directory_t    chdev_dir;
46
47//////////////////////////////////////////////////////////////////////////////////////////
48// This function is called by the process_zero_init() function during kernel_init.
49// It initializes the VMM of the kernel proces_zero (containing all kernel threads)
50// in the local cluster: For TSAR, it registers one "kcode" vseg in kernel VSL,
51// and registers one big page in slot[0] of kernel GPT.
52//////////////////////////////////////////////////////////////////////////////////////////
53error_t  hal_vmm_kernel_init( boot_info_t * info )
54{
55    error_t   error;
56
57    // get pointer on kernel GPT
58    gpt_t * gpt = &process_zero.vmm.gpt;
59
60    // get cluster identifier
61    cxy_t cxy = local_cxy;
62
63    // allocate memory for kernel GPT
64    error = hal_gpt_create( gpt );
65
66    if( error )
67    {
68        printk("\n[PANIC] in %s : cannot allocate kernel GPT in cluster %x\n",
69        __FUNCTION__ , cxy );
70        hal_core_sleep();
71    }
72
73#if DEBUG_HAL_VMM
74thread_t * this = CURRENT_THREAD;
75printk("\n[%s] thread[%x,%x] enter in cluster %x / gpt %x\n", 
76__FUNCTION__, this->process->pid, this->trdid, local_cxy, gpt );
77#endif
78
79    // compute attr and ppn for one PTE1
80    uint32_t attr = GPT_MAPPED | GPT_READABLE | GPT_CACHABLE | GPT_EXECUTABLE | GPT_GLOBAL;
81    uint32_t ppn  = cxy << 20;   
82
83    // set PT1[0]
84    hal_gpt_set_pte( XPTR( cxy , gpt ) , 0 , attr , ppn );
85
86#if DEBUG_HAL_VMM
87printk("\n[%s] thread[%x,%x] created PT1[0] : ppn %x / attr %x\n", 
88__FUNCTION__, this->process->pid, this->trdid, ppn, attr );
89#endif
90
91    // create kcode vseg and register it in kernel VSL
92    vseg_t * vseg = vmm_create_vseg( &process_zero,
93                                     VSEG_TYPE_KCODE,
94                                     info->kcode_base,
95                                     info->kcode_size,
96                                     0, 0,                  // file ofset and file size (unused)
97                                     XPTR_NULL,             // no mapper
98                                     local_cxy );
99    if( vseg == NULL )
100    {
101        printk("\n[PANIC] in %s : cannot register vseg to VSL in cluster %x\n",
102        __FUNCTION__ , cxy );
103        hal_core_sleep();
104    }
105
106#if DEBUG_HAL_VMM
107printk("\n[%s] thread[%x,%x] registered kcode vseg[%x,%x]\n",
108__FUNCTION__, this->process->pid, this->trdid, info->kcode_base, info->kcode_size );
109hal_vmm_display( &process_zero , true );
110#endif
111
112    return 0;
113
114}  // end hal_vmm_kernel_init()
115
116//////////////////////////////////////////////////////////////////////////////////////////
117// This function registers in the VMM of an user process identified by the <process>
118// argument all required kernel vsegs.
119// For TSAR, it registers in the user VSL the "kcode" vseg, from the local kernel VSL,
120// and register in the user GPT the big page[0] from the local kernel GPT.
121//////////////////////////////////////////////////////////////////////////////////////////
122error_t hal_vmm_kernel_update( process_t * process )
123{
124    error_t  error;
125    uint32_t attr;
126    uint32_t ppn;
127
128    // get cluster identifier
129    cxy_t cxy = local_cxy;
130
131#if DEBUG_HAL_VMM
132thread_t * this = CURRENT_THREAD;
133printk("\n[%s] thread[%x,%x] enter in cluster %x \n", 
134__FUNCTION__, this->process->pid, this->trdid, cxy );
135hal_vmm_display( &process_zero , true );
136hal_vmm_display( process , true );
137#endif
138
139    // get extended pointer on local kernel GPT
140    xptr_t k_gpt_xp = XPTR( cxy , &process_zero.vmm.gpt );
141
142    // get ppn and attributes from slot[0] of kernel GPT
143    hal_gpt_get_pte( k_gpt_xp , 0 , &attr , &ppn );
144
145#if DEBUG_HAL_VMM
146printk("\n[%s] thread[%x,%x] get PT1[0] ( ppn %x / attr %x ) from kernel  GPT\n", 
147__FUNCTION__, this->process->pid, this->trdid, ppn, attr );
148#endif
149
150    // get extended pointer on user GPT
151    xptr_t u_gpt_xp = XPTR( cxy , &process->vmm.gpt );
152
153    // update user GPT : set PTE1 in slot[0]
154    hal_gpt_set_pte( u_gpt_xp , 0 , attr , ppn );
155
156#if DEBUG_HAL_VMM
157printk("\n[%s] thread[%x,%x] registered PT1[0] ( ppn %x / attr %x ) to user GPT\n", 
158__FUNCTION__, this->process->pid, this->trdid, ppn, attr );
159#endif
160
161    // get pointer on the unique vseg registered in kernel VSL
162    xptr_t   root_xp = XPTR( cxy , &process_zero.vmm.vsegs_root );
163    xptr_t   vseg_xp = XLIST_FIRST( root_xp , vseg_t , xlist );
164    vseg_t * vseg    = GET_PTR( vseg_xp );
165
166// check vsegs_nr
167assert( (process_zero.vmm.vsegs_nr == 1 ) ,
168"bad vsegs number in kernel VSL = %d\n", process_zero.vmm.vsegs_nr );
169
170    // update user VSL : register one new vseg for kcode
171    vseg_t * new = vmm_create_vseg( process,
172                                    vseg->type,
173                                    vseg->min,
174                                    vseg->max - vseg->min,
175                                    0, 0,                  // file ofset and file size (unused)
176                                    XPTR_NULL,             // no mapper
177                                    local_cxy );
178    if( new == NULL )
179    {
180        printk("\n[ERROR] in %s : cannot update user VSL in cluster %x\n",
181        __FUNCTION__ , cxy );
182        return -1;
183    }
184
185#if DEBUG_HAL_VMM
186printk("\n[%s] thread[%x,%x] created vseg %s ( base %x / size %x ) to user VSL\n", 
187__FUNCTION__, this->process->pid, this->trdid,
188vseg_type_str(vseg->type) , vseg->min, (vseg->max - vseg->min) );
189hal_vmm_display( process , true );
190#endif
191
192    return 0;
193
194}  // end hal_vmm_kernel_update()
195
196//////////////////////////////////////////
197void hal_vmm_display( process_t * process,
198                      bool_t      mapping )
199{
200    // get pointer on process VMM
201    vmm_t * vmm = &process->vmm;
202
203    // get pointers on TXT0 chdev
204    xptr_t    txt0_xp  = chdev_dir.txt_tx[0];
205    cxy_t     txt0_cxy = GET_CXY( txt0_xp );
206    chdev_t * txt0_ptr = GET_PTR( txt0_xp );
207
208    // build extended pointer on TXT0 lock and VSL lock
209    xptr_t  txt_lock_xp = XPTR( txt0_cxy  , &txt0_ptr->wait_lock );
210    xptr_t  vsl_lock_xp = XPTR( local_cxy , &vmm->vsl_lock );
211
212    // get root of vsegs list
213    xptr_t root_xp = XPTR( local_cxy , &vmm->vsegs_root );
214
215    // get the locks protecting TXT0, VSL, and GPT
216    remote_rwlock_rd_acquire( vsl_lock_xp );
217    remote_busylock_acquire( txt_lock_xp );
218
219    nolock_printk("\n***** VSL and GPT for process %x in cluster %x / PT1 = %x\n",
220    process->pid , local_cxy , vmm->gpt.ptr );
221
222    if( xlist_is_empty( root_xp ) )
223    {
224        nolock_printk("   ... no vsegs registered\n");
225    }
226    else  // scan the list of vsegs
227    {
228        xptr_t         iter_xp;
229        xptr_t         vseg_xp;
230        vseg_t       * vseg;
231
232        XLIST_FOREACH( root_xp , iter_xp )
233        {
234            vseg_xp = XLIST_ELEMENT( iter_xp , vseg_t , xlist );
235            vseg    = GET_PTR( vseg_xp );
236
237            nolock_printk(" - %s : base = %X / size = %X / npages = %d\n",
238            vseg_type_str(vseg->type), vseg->min, vseg->max - vseg->min, vseg->vpn_size );
239
240            if( mapping ) 
241            {
242                vpn_t    vpn     = vseg->vpn_base;
243                vpn_t    vpn_max = vpn + vseg->vpn_size;
244                ppn_t    ppn;
245                uint32_t attr;
246
247                while( vpn < vpn_max )   // scan the PTEs
248                {
249                    hal_gpt_get_pte( XPTR( local_cxy , &vmm->gpt ) , vpn , &attr , &ppn );
250
251                    if( attr & GPT_MAPPED )
252                    {
253                        if( attr & GPT_SMALL )
254                        {
255                            nolock_printk("    . SMALL : vpn = %X / attr = %X / ppn = %X\n",
256                            vpn , attr , ppn );
257                            vpn++;
258                        }
259                        else
260                        {
261                            nolock_printk("    . BIG   : vpn = %X / attr = %X / ppn = %X\n",
262                            vpn , attr , ppn );
263                            vpn += 512;
264                        }
265                    }
266                    else
267                    {
268                        vpn++;
269                    }
270                }
271            }
272        }
273    }
274
275    // release locks
276    remote_busylock_release( txt_lock_xp );
277    remote_rwlock_rd_release( vsl_lock_xp );
278
279}  // hal_vmm_display()
280
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