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001 /* Copyright (C) 2005 David Decotigny 001 /* Copyright (C) 2005 David Decotigny 002 002 003 This program is free software; you can redi 003 This program is free software; you can redistribute it and/or 004 modify it under the terms of the GNU Genera 004 modify it under the terms of the GNU General Public License 005 as published by the Free Software Foundatio 005 as published by the Free Software Foundation; either version 2 006 of the License, or (at your option) any lat 006 of the License, or (at your option) any later version. 007 007 008 This program is distributed in the hope tha 008 This program is distributed in the hope that it will be useful, 009 but WITHOUT ANY WARRANTY; without even the 009 but WITHOUT ANY WARRANTY; without even the implied warranty of 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 011 GNU General Public License for more details 011 GNU General Public License for more details. 012 012 013 You should have received a copy of the GNU 013 You should have received a copy of the GNU General Public License 014 along with this program; if not, write to t 014 along with this program; if not, write to the Free Software 015 Foundation, Inc., 59 Temple Place - Suite 3 015 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 016 USA. 016 USA. 017 */ 017 */ 018 018 019 #include <sos/assert.h> 019 #include <sos/assert.h> 020 #include <sos/list.h> 020 #include <sos/list.h> 021 #include <sos/kmem_slab.h> 021 #include <sos/kmem_slab.h> 022 #include <hwcore/irq.h> 022 #include <hwcore/irq.h> 023 #include <drivers/bochs.h> 023 #include <drivers/bochs.h> 024 024 025 #include <sos/umem_vmm.h> !! 025 #include <hwcore/mm_context.h> 026 026 027 #include "process.h" 027 #include "process.h" 028 028 029 #define SOS_PROCESS_MAX_OPENED_FILES 64 !! 029 030 #define SOS_PROCESS_MAX_NAMELEN 32 !! 030 #define SOS_PROCESS_MAX_NAMELEN 32 031 031 032 032 033 /** 033 /** 034 * Definition of a process in SOS. A process i 034 * Definition of a process in SOS. A process is basically the 035 * collection of all the resources requested b 035 * collection of all the resources requested by a user program. The 036 * threads are one of these resources, the mm_ 036 * threads are one of these resources, the mm_context is one other 037 * example of such resources. 037 * example of such resources. 038 */ 038 */ 039 struct sos_process 039 struct sos_process 040 { 040 { 041 char name[SOS_PROCESS_MAX_NAMELEN]; 041 char name[SOS_PROCESS_MAX_NAMELEN]; 042 042 043 /** First important resource: the address sp !! 043 /** First important resource: the MMU translation tables' 044 struct sos_umem_vmm_as *address_space; !! 044 configuration */ >> 045 struct sos_mm_context *mm_context; 045 046 046 /** Second important resource: the CPU execu 047 /** Second important resource: the CPU execution contexts, aka the 047 threads executing in the context of this 048 threads executing in the context of this process. */ 048 struct sos_thread *thread_list; 049 struct sos_thread *thread_list; 049 sos_count_t nb_threads; 050 sos_count_t nb_threads; 050 051 051 /** Reference counter, including threads */ 052 /** Reference counter, including threads */ 052 sos_count_t ref_cnt; 053 sos_count_t ref_cnt; 053 054 054 /** The array of opened file descriptors */ << 055 struct sos_fs_opened_file * fds[SOS_PROCESS_ << 056 << 057 /** Where the root of the process is (for ch << 058 struct sos_fs_opened_file * root; << 059 << 060 /** Where the current working dir of the pro << 061 struct sos_fs_opened_file * cwd; << 062 << 063 struct sos_process *prev, *next; 055 struct sos_process *prev, *next; 064 }; 056 }; 065 057 066 058 067 /** The list of processes in the system */ 059 /** The list of processes in the system */ 068 static struct sos_process *process_list = NULL 060 static struct sos_process *process_list = NULL; 069 061 070 062 071 /** The cache for the sos_process structures * 063 /** The cache for the sos_process structures */ 072 struct sos_kslab_cache *cache_struct_process; 064 struct sos_kslab_cache *cache_struct_process; 073 065 074 066 075 /** 067 /** 076 * Helper function for debugging purposes 068 * Helper function for debugging purposes 077 */ 069 */ 078 void sos_process_dumplist(void) !! 070 void sos_process_dumplist() 079 { 071 { 080 struct sos_thread * cur_thr = sos_thread_get 072 struct sos_thread * cur_thr = sos_thread_get_current(); 081 struct sos_process * proc; 073 struct sos_process * proc; 082 int nb_procs; 074 int nb_procs; 083 075 084 sos_bochs_printf("<ps>\n"); 076 sos_bochs_printf("<ps>\n"); 085 list_foreach(process_list, proc, nb_procs) 077 list_foreach(process_list, proc, nb_procs) 086 { 078 { 087 struct sos_thread * thr; 079 struct sos_thread * thr; 088 int nb_thrs; 080 int nb_thrs; 089 081 090 sos_bochs_printf(" proc@%p: '%s', %d th 082 sos_bochs_printf(" proc@%p: '%s', %d threads, %d refs\n", 091 proc, proc->name?proc-> 083 proc, proc->name?proc->name:"(none)", 092 proc->nb_threads, proc- 084 proc->nb_threads, proc->ref_cnt); 093 085 094 list_foreach_forward_named(proc->thread_ 086 list_foreach_forward_named(proc->thread_list, thr, nb_thrs, 095 prev_in_proce 087 prev_in_process, next_in_process) 096 { 088 { 097 if (thr == cur_thr) 089 if (thr == cur_thr) 098 sos_bochs_printf(" thr@%p: [CUR 090 sos_bochs_printf(" thr@%p: [CURRENT]\n", thr); 099 else 091 else 100 sos_bochs_printf(" thr@%p: %cst 092 sos_bochs_printf(" thr@%p: %cstate=%d eip=%p\n", 101 thr, 093 thr, 102 sos_cpu_context_i 094 sos_cpu_context_is_in_user_mode(thr->cpu_state)?'u':'k', 103 thr->state, 095 thr->state, 104 (void*)sos_cpu_co 096 (void*)sos_cpu_context_get_PC(thr->cpu_state)); 105 } 097 } 106 } 098 } 107 sos_bochs_printf(" ======= %d processes === 099 sos_bochs_printf(" ======= %d processes =======\n", nb_procs); 108 sos_bochs_printf("</ps>\n"); 100 sos_bochs_printf("</ps>\n"); 109 } 101 } 110 102 111 103 112 sos_ret_t sos_process_subsystem_setup() 104 sos_ret_t sos_process_subsystem_setup() 113 { 105 { 114 /* Create the cache for the process structur 106 /* Create the cache for the process structures */ 115 cache_struct_process = sos_kmem_cache_create 107 cache_struct_process = sos_kmem_cache_create("struct_process", 116 108 sizeof(struct sos_process), 117 109 3, 118 110 0, 119 111 SOS_KSLAB_CREATE_MAP 120 112 | SOS_KSLAB_CREATE_ZERO); 121 if (! cache_struct_process) 113 if (! cache_struct_process) 122 return -SOS_ENOMEM; 114 return -SOS_ENOMEM; 123 115 124 return SOS_OK; 116 return SOS_OK; 125 } 117 } 126 118 127 119 128 struct sos_process *sos_process_create(const c !! 120 struct sos_process *sos_process_create_empty(const char *name) 129 sos_boo << 130 { 121 { 131 sos_ret_t retval = SOS_OK; << 132 sos_ui32_t flags; 122 sos_ui32_t flags; 133 struct sos_process *proc; 123 struct sos_process *proc; 134 124 135 << 136 proc = (struct sos_process*) sos_kmem_cache_ 125 proc = (struct sos_process*) sos_kmem_cache_alloc(cache_struct_process, 0); 137 if (! proc) 126 if (! proc) 138 return NULL; 127 return NULL; 139 128 140 /* proc is already filled with 0 (cache has 129 /* proc is already filled with 0 (cache has SOS_KSLAB_CREATE_ZERO 141 flag) */ 130 flag) */ 142 131 143 /* Copy the file descriptors when needed */ !! 132 /* Initialize a new mm_context */ 144 if (do_copy_current_process) !! 133 proc->mm_context = sos_mm_context_create(); 145 { !! 134 if (NULL == proc->mm_context) 146 struct sos_process * myself = sos_thread << 147 int fd; << 148 << 149 for (fd = 0 ; fd < SOS_PROCESS_MAX_OPENE << 150 if (NULL != myself->fds[fd]) << 151 { << 152 retval = sos_fs_duplicate_opened_f << 153 << 154 << 155 if (SOS_OK != retval) << 156 goto end_create_proc; << 157 } << 158 << 159 retval = sos_fs_duplicate_opened_file(my << 160 pr << 161 & << 162 if (SOS_OK != retval) << 163 goto end_create_proc; << 164 << 165 retval = sos_fs_duplicate_opened_file(my << 166 pr << 167 & << 168 if (SOS_OK != retval) << 169 goto end_create_proc; << 170 } << 171 << 172 if (do_copy_current_process) << 173 proc->address_space = sos_umem_vmm_duplica << 174 else << 175 proc->address_space = sos_umem_vmm_create_ << 176 << 177 if (NULL == proc->address_space) << 178 { 135 { 179 /* Error */ 136 /* Error */ 180 retval = -SOS_ENOMEM; !! 137 sos_kmem_cache_free((sos_vaddr_t)proc); 181 goto end_create_proc; !! 138 return NULL; 182 } 139 } 183 140 184 if (!name) 141 if (!name) 185 { 142 { 186 struct sos_thread * cur_thr = sos_thread << 187 if (do_copy_current_process) << 188 name = cur_thr->process->name; << 189 else << 190 name = "[UNNAMED]"; 143 name = "[UNNAMED]"; 191 } 144 } 192 145 193 strzcpy(proc->name, name, SOS_PROCESS_MAX_NA 146 strzcpy(proc->name, name, SOS_PROCESS_MAX_NAMELEN); 194 147 195 /* Add it to the global list of processes */ 148 /* Add it to the global list of processes */ 196 sos_disable_IRQs(flags); 149 sos_disable_IRQs(flags); 197 list_add_tail(process_list, proc); 150 list_add_tail(process_list, proc); 198 sos_restore_IRQs(flags); 151 sos_restore_IRQs(flags); 199 152 200 /* Mark the process as referenced */ 153 /* Mark the process as referenced */ 201 proc->ref_cnt = 1; 154 proc->ref_cnt = 1; 202 << 203 end_create_proc: << 204 if (SOS_OK != retval) << 205 { << 206 int fd; << 207 << 208 /* Close the file descriptors */ << 209 for (fd = 0 ; fd < SOS_PROCESS_MAX_OPENE << 210 if (NULL != proc->fds[fd]) << 211 { << 212 sos_fs_close(proc->fds[fd]); << 213 proc->fds[fd] = NULL; << 214 } << 215 << 216 if (proc->root) << 217 sos_fs_close(proc->root); << 218 if (proc->cwd) << 219 sos_fs_close(proc->cwd); << 220 proc->root = proc->cwd = NULL; << 221 << 222 sos_kmem_cache_free((sos_vaddr_t) proc); << 223 proc = NULL; << 224 } << 225 << 226 return proc; 155 return proc; 227 } 156 } 228 157 229 158 230 inline 159 inline 231 sos_ret_t sos_process_ref(struct sos_process * 160 sos_ret_t sos_process_ref(struct sos_process *proc) 232 { 161 { 233 sos_ui32_t flags; 162 sos_ui32_t flags; 234 sos_disable_IRQs(flags); 163 sos_disable_IRQs(flags); 235 proc->ref_cnt ++; 164 proc->ref_cnt ++; 236 sos_restore_IRQs(flags); 165 sos_restore_IRQs(flags); 237 return SOS_OK; 166 return SOS_OK; 238 } 167 } 239 168 240 169 241 sos_count_t sos_process_get_nb_threads(const s 170 sos_count_t sos_process_get_nb_threads(const struct sos_process *proc) 242 { 171 { 243 sos_count_t retval; 172 sos_count_t retval; 244 sos_ui32_t flags; 173 sos_ui32_t flags; 245 sos_disable_IRQs(flags); 174 sos_disable_IRQs(flags); 246 retval = proc->nb_threads; 175 retval = proc->nb_threads; 247 sos_restore_IRQs(flags); 176 sos_restore_IRQs(flags); 248 return retval; 177 return retval; 249 } 178 } 250 179 251 180 252 struct sos_mm_context * 181 struct sos_mm_context * 253 sos_process_get_mm_context(const struct sos_pr 182 sos_process_get_mm_context(const struct sos_process *proc) 254 { 183 { 255 return sos_umem_vmm_get_mm_context(proc->add !! 184 return proc->mm_context; 256 } << 257 << 258 << 259 struct sos_umem_vmm_as * << 260 sos_process_get_address_space(const struct sos << 261 { << 262 return proc->address_space; << 263 } << 264 << 265 << 266 sos_ret_t sos_process_set_address_space(struct << 267 struct << 268 { << 269 int fd; << 270 << 271 /* Close the FD that are not allowed to be d << 272 for (fd = 0 ; fd < SOS_PROCESS_MAX_OPENED_FI << 273 if ( (NULL != proc->fds[fd]) << 274 && (proc->fds[fd]->open_flags & SOS_F << 275 { << 276 sos_fs_close(proc->fds[fd]); << 277 proc->fds[fd] = NULL; << 278 } << 279 << 280 if (proc->address_space) << 281 { << 282 sos_ret_t retval = sos_umem_vmm_delete_a << 283 if (SOS_OK != retval) << 284 return retval; << 285 } << 286 << 287 proc->address_space = new_as; << 288 return SOS_OK; << 289 } << 290 << 291 << 292 struct sos_fs_opened_file * << 293 sos_process_get_root(const struct sos_process << 294 { << 295 return proc->root; << 296 } 185 } 297 186 298 187 299 struct sos_fs_opened_file * << 300 sos_process_get_cwd(const struct sos_process * << 301 { << 302 return proc->cwd; << 303 } << 304 << 305 << 306 struct sos_fs_opened_file * << 307 sos_process_get_opened_file(const struct sos_p << 308 int fd) << 309 { << 310 if ((fd < 0) || (fd >= SOS_PROCESS_MAX_OPENE << 311 return NULL; << 312 return proc->fds[fd]; << 313 } << 314 << 315 << 316 sos_ret_t << 317 sos_process_chroot(struct sos_process *proc, << 318 struct sos_fs_opened_file * << 319 struct sos_fs_opened_file * << 320 { << 321 *old_root = proc->root; << 322 proc->root = new_root; << 323 << 324 return SOS_OK; << 325 } << 326 << 327 << 328 sos_ret_t << 329 sos_process_chdir(struct sos_process *proc, << 330 struct sos_fs_opened_file * << 331 struct sos_fs_opened_file ** << 332 { << 333 *old_cwd = proc->cwd; << 334 proc->cwd = new_cwd; << 335 << 336 return SOS_OK; << 337 } << 338 << 339 << 340 sos_ret_t << 341 sos_process_register_opened_file(struct sos_pr << 342 struct sos_fs << 343 { << 344 int i; << 345 for (i = 0 ; i < SOS_PROCESS_MAX_OPENED_FILE << 346 if (NULL == proc->fds[i]) << 347 { << 348 proc->fds[i] = of; << 349 return i; << 350 } << 351 << 352 return -SOS_EMFILE; << 353 } << 354 << 355 << 356 sos_ret_t << 357 sos_process_unregister_opened_file(struct sos_ << 358 int fd) << 359 { << 360 if ((fd < 0) || (fd >= SOS_PROCESS_MAX_OPENE << 361 return -SOS_EBADF; << 362 << 363 proc->fds[fd] = NULL; << 364 return SOS_OK; << 365 } << 366 << 367 << 368 << 369 /* ******************************************* 188 /* *************************************************** 370 * Restricted functions 189 * Restricted functions 371 */ 190 */ 372 191 373 192 374 sos_ret_t sos_process_register_thread(struct s 193 sos_ret_t sos_process_register_thread(struct sos_process *in_proc, 375 struct s 194 struct sos_thread *thr) 376 { 195 { 377 sos_ui32_t flags; 196 sos_ui32_t flags; 378 197 379 /* The process is assumed to be referenced b 198 /* The process is assumed to be referenced by somebody */ 380 SOS_ASSERT_FATAL(in_proc->ref_cnt > 0); 199 SOS_ASSERT_FATAL(in_proc->ref_cnt > 0); 381 200 382 /* Only threads that are being created are a 201 /* Only threads that are being created are allowed to be attached to 383 a process */ 202 a process */ 384 SOS_ASSERT_FATAL(thr->state == SOS_THR_CREAT 203 SOS_ASSERT_FATAL(thr->state == SOS_THR_CREATED); 385 204 386 /* Update the list of the threads in the pro 205 /* Update the list of the threads in the process */ 387 thr->process = in_proc; 206 thr->process = in_proc; 388 207 389 /* Increment the reference count for the pro 208 /* Increment the reference count for the process */ 390 sos_process_ref(in_proc); 209 sos_process_ref(in_proc); 391 210 392 /* Add the thread to the process thread's li 211 /* Add the thread to the process thread's list */ 393 sos_disable_IRQs(flags); 212 sos_disable_IRQs(flags); 394 list_add_tail_named(in_proc->thread_list, th 213 list_add_tail_named(in_proc->thread_list, thr, 395 prev_in_process, next_in 214 prev_in_process, next_in_process); 396 in_proc->nb_threads ++; 215 in_proc->nb_threads ++; 397 sos_restore_IRQs(flags); 216 sos_restore_IRQs(flags); 398 217 399 return SOS_OK; 218 return SOS_OK; 400 } 219 } 401 220 402 221 403 /** The function responsible for releasing the 222 /** The function responsible for releasing the resources held by the 404 process. */ 223 process. */ 405 sos_ret_t sos_process_unref(struct sos_process 224 sos_ret_t sos_process_unref(struct sos_process *proc) 406 { 225 { 407 sos_ui32_t flags; 226 sos_ui32_t flags; 408 sos_ret_t retval; 227 sos_ret_t retval; 409 int fd; << 410 228 411 SOS_ASSERT_FATAL(proc->ref_cnt > 0); 229 SOS_ASSERT_FATAL(proc->ref_cnt > 0); 412 230 413 sos_disable_IRQs(flags); 231 sos_disable_IRQs(flags); 414 proc->ref_cnt --; 232 proc->ref_cnt --; 415 if (proc->ref_cnt > 0) 233 if (proc->ref_cnt > 0) 416 { 234 { 417 sos_restore_IRQs(flags); 235 sos_restore_IRQs(flags); 418 return -SOS_EBUSY; 236 return -SOS_EBUSY; 419 } 237 } 420 list_delete(process_list, proc); 238 list_delete(process_list, proc); 421 sos_restore_IRQs(flags); 239 sos_restore_IRQs(flags); 422 240 423 /* Close the file descriptors */ !! 241 /* First: release the mm_context */ 424 for (fd = 0 ; fd < SOS_PROCESS_MAX_OPENED_FI !! 242 retval = sos_mm_context_unref(proc->mm_context); 425 if (NULL != proc->fds[fd]) << 426 { << 427 sos_fs_close(proc->fds[fd]); << 428 proc->fds[fd] = NULL; << 429 } << 430 << 431 sos_fs_close(proc->root); << 432 sos_fs_close(proc->cwd); << 433 proc->root = proc->cwd = NULL; << 434 << 435 /* First: free the user address space */ << 436 retval = sos_umem_vmm_delete_as(proc->addres << 437 SOS_ASSERT_FATAL(SOS_OK == retval); 243 SOS_ASSERT_FATAL(SOS_OK == retval); 438 244 439 /* Free the process structure */ 245 /* Free the process structure */ 440 sos_kmem_cache_free((sos_vaddr_t)proc); 246 sos_kmem_cache_free((sos_vaddr_t)proc); 441 247 442 return SOS_OK; 248 return SOS_OK; 443 } 249 } 444 250 445 251 446 sos_ret_t sos_process_unregister_thread(struct 252 sos_ret_t sos_process_unregister_thread(struct sos_thread *thr) 447 { 253 { 448 sos_ui32_t flags; 254 sos_ui32_t flags; 449 struct sos_process * in_proc = thr->process; 255 struct sos_process * in_proc = thr->process; 450 256 451 SOS_ASSERT_FATAL(thr->state == SOS_THR_ZOMBI 257 SOS_ASSERT_FATAL(thr->state == SOS_THR_ZOMBIE); 452 258 453 /* Update the list of the threads in the pro 259 /* Update the list of the threads in the process */ 454 thr->process = NULL; 260 thr->process = NULL; 455 sos_disable_IRQs(flags); 261 sos_disable_IRQs(flags); 456 list_delete_named(in_proc->thread_list, thr, 262 list_delete_named(in_proc->thread_list, thr, 457 prev_in_process, next_in_p 263 prev_in_process, next_in_process); 458 SOS_ASSERT_FATAL(in_proc->nb_threads > 0); 264 SOS_ASSERT_FATAL(in_proc->nb_threads > 0); 459 in_proc->nb_threads --; 265 in_proc->nb_threads --; 460 sos_restore_IRQs(flags); 266 sos_restore_IRQs(flags); 461 267 462 /* Unreference the process */ 268 /* Unreference the process */ 463 sos_process_unref(in_proc); 269 sos_process_unref(in_proc); 464 270 465 return SOS_OK; 271 return SOS_OK; 466 } 272 } 467 273 468 274 469 sos_ret_t sos_process_set_name(struct sos_proc 275 sos_ret_t sos_process_set_name(struct sos_process * proc, 470 const char * ne 276 const char * new_name) 471 { 277 { 472 strzcpy(proc->name, new_name, SOS_PROCESS_MA 278 strzcpy(proc->name, new_name, SOS_PROCESS_MAX_NAMELEN); 473 return SOS_OK; 279 return SOS_OK; 474 } 280 }
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