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001 /* Copyright (C) 2004,2005 David Decotigny 001 /* Copyright (C) 2004,2005 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 #ifndef _SOS_THREAD_H_ 018 #ifndef _SOS_THREAD_H_ 019 #define _SOS_THREAD_H_ 019 #define _SOS_THREAD_H_ 020 020 021 /** 021 /** 022 * @file thread.h 022 * @file thread.h 023 * 023 * 024 * SOS Thread management API 024 * SOS Thread management API 025 */ 025 */ 026 026 027 #include <sos/errno.h> 027 #include <sos/errno.h> 028 028 029 /* Forward declaration */ 029 /* Forward declaration */ 030 struct sos_thread; 030 struct sos_thread; 031 031 032 #include <hwcore/cpu_context.h> 032 #include <hwcore/cpu_context.h> 033 #include <sos/sched.h> 033 #include <sos/sched.h> 034 #include <sos/kwaitq.h> 034 #include <sos/kwaitq.h> 035 #include <sos/time.h> 035 #include <sos/time.h> 036 #include <sos/process.h> 036 #include <sos/process.h> 037 #include <sos/umem_vmm.h> 037 #include <sos/umem_vmm.h> 038 038 039 /** 039 /** 040 * The possible states of a valid thread 040 * The possible states of a valid thread 041 */ 041 */ 042 typedef enum { SOS_THR_CREATED, /**< Thread cr 042 typedef enum { SOS_THR_CREATED, /**< Thread created, not fully initialized */ 043 SOS_THR_READY, /**< Thread fu 043 SOS_THR_READY, /**< Thread fully initialized or 044 waiting f 044 waiting for CPU after having been 045 blocked o 045 blocked or preempted */ 046 SOS_THR_RUNNING, /**< Thread cu 046 SOS_THR_RUNNING, /**< Thread currently running on CPU */ 047 SOS_THR_BLOCKED, /**< Thread wa 047 SOS_THR_BLOCKED, /**< Thread waiting for I/O (+ in at LEAST 048 one kwait 048 one kwaitq) and/or sleeping (+ in NO 049 kwaitq) * 049 kwaitq) */ 050 SOS_THR_ZOMBIE, /**< Thread te 050 SOS_THR_ZOMBIE, /**< Thread terminated execution, waiting to 051 be delete 051 be deleted by kernel */ 052 } sos_thread_state_t; 052 } sos_thread_state_t; 053 053 054 054 055 /** 055 /** 056 * TCB (Thread Control Block): structure descr 056 * TCB (Thread Control Block): structure describing a thread. Don't 057 * access these fields directly: prefer using 057 * access these fields directly: prefer using the accessor functions 058 * below. 058 * below. 059 */ 059 */ 060 struct sos_thread 060 struct sos_thread 061 { 061 { 062 #define SOS_THR_MAX_NAMELEN 32 062 #define SOS_THR_MAX_NAMELEN 32 063 char name[SOS_THR_MAX_NAMELEN]; 063 char name[SOS_THR_MAX_NAMELEN]; 064 064 065 sos_thread_state_t state; 065 sos_thread_state_t state; 066 sos_sched_priority_t priority; 066 sos_sched_priority_t priority; 067 067 068 /** 068 /** 069 * The hardware context of the thread. 069 * The hardware context of the thread. 070 * 070 * 071 * It will reflect the CPU state of the thre 071 * It will reflect the CPU state of the thread: 072 * - From an interrupt handler: the state o 072 * - From an interrupt handler: the state of the thread at the time 073 * of the OUTERMOST irq. An IRQ is not al 073 * of the OUTERMOST irq. An IRQ is not allowed to make context 074 * switches, so this context will remain 074 * switches, so this context will remain valid from the begining of 075 * the outermost IRQ handler to the end o 075 * the outermost IRQ handler to the end of it, no matter if there 076 * are other IRQ handlers nesting in one 076 * are other IRQ handlers nesting in one another. You may safely 077 * use it from IRQ handlers to query the 077 * use it from IRQ handlers to query the state of the interrupted 078 * thread, no matter if there has been ot 078 * thread, no matter if there has been other IRQ handlers 079 * executing meanwhile. 079 * executing meanwhile. 080 * - From normal kernel code, exceptions an 080 * - From normal kernel code, exceptions and syscall: the state of 081 * the thread the last time there was a c 081 * the thread the last time there was a context switch from this 082 * thread to another one. Thus this field 082 * thread to another one. Thus this field WON'T reflect the 083 * current's thread cpu_state in these ca 083 * current's thread cpu_state in these cases. So, in these cases, 084 * simply DO NOT USE IT outside thread.c 084 * simply DO NOT USE IT outside thread.c ! Note: for syscall and 085 * exception handlers, the VALID state of 085 * exception handlers, the VALID state of the interrupted thread is 086 * passed as an argument to the handlers. 086 * passed as an argument to the handlers. 087 */ 087 */ 088 struct sos_cpu_state *cpu_state; 088 struct sos_cpu_state *cpu_state; 089 089 090 /* Kernel stack parameters */ 090 /* Kernel stack parameters */ 091 sos_vaddr_t kernel_stack_base_addr; 091 sos_vaddr_t kernel_stack_base_addr; 092 sos_size_t kernel_stack_size; 092 sos_size_t kernel_stack_size; 093 093 094 /* Process this thread belongs to. Always NU 094 /* Process this thread belongs to. Always NULL for a kernel 095 thread */ 095 thread */ 096 struct sos_process *process; 096 struct sos_process *process; 097 097 098 /** 098 /** 099 * Address space currently "squatted" by the 099 * Address space currently "squatted" by the thread, or used to be 100 * active when the thread was interrupted/pr 100 * active when the thread was interrupted/preempted. This is the MMU 101 * configuration expected before the cpu_sta 101 * configuration expected before the cpu_state of the thread is 102 * restored on CPU. 102 * restored on CPU. 103 * - For kernel threads: should normally b 103 * - For kernel threads: should normally be NULL, meaning that the 104 * thread will squat the current mm_cont 104 * thread will squat the current mm_context currently set in the 105 * MMU. Might be NON NULL when a kernel 105 * MMU. Might be NON NULL when a kernel thread squats a given 106 * process to manipulate its address spa 106 * process to manipulate its address space. 107 * - For user threads: should normally be 107 * - For user threads: should normally be NULL. More precisely: 108 * - in user mode: the thread->process 108 * - in user mode: the thread->process.mm_context is ALWAYS 109 * set on MMU. squatted_mm_context i 109 * set on MMU. squatted_mm_context is ALWAYS NULL in this 110 * situation, meaning that the threa 110 * situation, meaning that the thread in user mode uses its 111 * process-space as expected 111 * process-space as expected 112 * - in kernel mode: NULL means that w 112 * - in kernel mode: NULL means that we keep on using the 113 * mm_context currently set on MMU, 113 * mm_context currently set on MMU, which might be the 114 * mm_context of another process. Th 114 * mm_context of another process. This is natural since a 115 * thread in kernel mode normally on 115 * thread in kernel mode normally only uses data in kernel 116 * space. BTW, this limits the numbe 116 * space. BTW, this limits the number of TLB flushes. However, 117 * there are exceptions where this s 117 * there are exceptions where this squatted_mm_context will 118 * NOT be NULL. One is the copy_from 118 * NOT be NULL. One is the copy_from/to_user API, which can 119 * force the effective mm_context so 119 * force the effective mm_context so that the MMU will be 120 * (re)configured upon every context 120 * (re)configured upon every context to the thread to match 121 * the squatted_mm_context. Another 121 * the squatted_mm_context. Another exception is when a parent 122 * thread creates the address space 122 * thread creates the address space of a child process, in 123 * which case the parent thread migh 123 * which case the parent thread might temporarilly decide to 124 * switch to the child's process spa 124 * switch to the child's process space. 125 * 125 * 126 * This is the SOS implementation of the Lin 126 * This is the SOS implementation of the Linux "Lazy TLB" and 127 * address-space loaning. 127 * address-space loaning. 128 */ 128 */ 129 struct sos_mm_context *squatted_mm_context; 129 struct sos_mm_context *squatted_mm_context; 130 130 131 /* Data specific to each state */ 131 /* Data specific to each state */ 132 union 132 union 133 { 133 { 134 struct 134 struct 135 { 135 { 136 struct sos_sched_queue *rdy_queue; 136 struct sos_sched_queue *rdy_queue; 137 struct sos_thread *rdy_prev, *rdy_ne 137 struct sos_thread *rdy_prev, *rdy_next; 138 } ready; 138 } ready; 139 << 140 struct << 141 { << 142 struct sos_time user_time_spent_in_slice << 143 } running; << 144 }; /* Anonymous union (gcc extenion) */ 139 }; /* Anonymous union (gcc extenion) */ 145 140 >> 141 struct sos_time user_time_spent_in_slice; >> 142 146 143 147 /** 144 /** 148 * When a thread in kernel mode is accessing 145 * When a thread in kernel mode is accessing the user space, it may 149 * page fault in the usual way only if retur 146 * page fault in the usual way only if return_vaddr below is 150 * set. This structure holds information reg 147 * set. This structure holds information regarding what to do when a 151 * page fault from kernel into user space co 148 * page fault from kernel into user space could not be resolved. 152 * 149 * 153 * @note the fields below should be consider 150 * @note the fields below should be considered read-only. @see 154 * sos_thread_prepare_user_space_access() an 151 * sos_thread_prepare_user_space_access() and @see 155 * sos_thread_end_user_space_access() to mod 152 * sos_thread_end_user_space_access() to modify them. 156 */ 153 */ 157 struct 154 struct 158 { 155 { 159 /** This is the address (in kernel code) t 156 /** This is the address (in kernel code) to return to when a 160 user-space page fault from a kernel-mo 157 user-space page fault from a kernel-mode thread could not be 161 resolved. @see sos_thread_prepare_use 158 resolved. @see sos_thread_prepare_user_space_access() */ 162 sos_vaddr_t return_vaddr; 159 sos_vaddr_t return_vaddr; 163 160 164 /** This is the address of the user-space 161 /** This is the address of the user-space address that caused the 165 unresolved page fault (set by the page 162 unresolved page fault (set by the page fault handler) */ 166 sos_uaddr_t faulted_uaddr; 163 sos_uaddr_t faulted_uaddr; 167 } fixup_uaccess; 164 } fixup_uaccess; 168 165 169 166 170 /* 167 /* 171 * Data used by the kwaitq subsystem: list o 168 * Data used by the kwaitq subsystem: list of kwaitqueues the thread 172 * is waiting for. 169 * is waiting for. 173 * 170 * 174 * @note: a RUNNING or READY thread might be 171 * @note: a RUNNING or READY thread might be in one or more 175 * waitqueues ! The only property we have is 172 * waitqueues ! The only property we have is that, among these 176 * waitqueues (if any), _at least_ one has w 173 * waitqueues (if any), _at least_ one has woken the thread. 177 */ 174 */ 178 struct sos_kwaitq_entry *kwaitq_list; 175 struct sos_kwaitq_entry *kwaitq_list; 179 176 180 177 181 /** 178 /** 182 * Some statistics 179 * Some statistics 183 */ 180 */ 184 struct rusage 181 struct rusage 185 { 182 { 186 /* Updated by sched.c */ 183 /* Updated by sched.c */ 187 struct sos_time ru_utime; /* Time spent in 184 struct sos_time ru_utime; /* Time spent in user mode */ 188 struct sos_time ru_stime; /* Time spent in 185 struct sos_time ru_stime; /* Time spent in kernel mode */ 189 } rusage; 186 } rusage; 190 187 191 188 192 /** 189 /** 193 * Chaining pointers for the list of threads 190 * Chaining pointers for the list of threads in the parent process 194 */ 191 */ 195 struct sos_thread *prev_in_process, *next_in 192 struct sos_thread *prev_in_process, *next_in_process; 196 193 197 194 198 /** 195 /** 199 * Chaining pointers for global ("gbl") list 196 * Chaining pointers for global ("gbl") list of threads (debug) 200 */ 197 */ 201 struct sos_thread *gbl_prev, *gbl_next; 198 struct sos_thread *gbl_prev, *gbl_next; 202 }; 199 }; 203 200 204 201 205 /** 202 /** 206 * Definition of the function executed by a ke 203 * Definition of the function executed by a kernel thread 207 */ 204 */ 208 typedef void (*sos_kernel_thread_start_routine 205 typedef void (*sos_kernel_thread_start_routine_t)(void *arg); 209 206 210 207 211 /** 208 /** 212 * Initialize the subsystem responsible for th 209 * Initialize the subsystem responsible for thread management 213 * 210 * 214 * Initialize the primary kernel thread so tha 211 * Initialize the primary kernel thread so that it can be handled the 215 * same way as an ordinary thread created by s 212 * same way as an ordinary thread created by sos_thread_create(). 216 */ 213 */ 217 sos_ret_t sos_thread_subsystem_setup(sos_vaddr 214 sos_ret_t sos_thread_subsystem_setup(sos_vaddr_t init_thread_stack_base_addr, 218 sos_size_ 215 sos_size_t init_thread_stack_size); 219 216 220 217 221 /** 218 /** 222 * Create a new kernel thread 219 * Create a new kernel thread 223 */ 220 */ 224 struct sos_thread * 221 struct sos_thread * 225 sos_create_kernel_thread(const char *name, 222 sos_create_kernel_thread(const char *name, 226 sos_kernel_thread_sta 223 sos_kernel_thread_start_routine_t start_func, 227 void *start_arg, 224 void *start_arg, 228 sos_sched_priority_t 225 sos_sched_priority_t priority); 229 226 230 227 231 /** 228 /** 232 * Create a new user thread 229 * Create a new user thread 233 */ 230 */ 234 struct sos_thread * 231 struct sos_thread * 235 sos_create_user_thread(const char *name, 232 sos_create_user_thread(const char *name, 236 struct sos_process *pro 233 struct sos_process *process, 237 sos_uaddr_t user_initia 234 sos_uaddr_t user_initial_PC, 238 sos_ui32_t user_start_ 235 sos_ui32_t user_start_arg1, 239 sos_ui32_t user_start_ 236 sos_ui32_t user_start_arg2, 240 sos_uaddr_t user_initia 237 sos_uaddr_t user_initial_SP, 241 sos_sched_priority_t pr 238 sos_sched_priority_t priority); 242 239 243 240 244 /** 241 /** 245 * Create a new user thread, copy of the given 242 * Create a new user thread, copy of the given user thread with the 246 * given user context 243 * given user context 247 */ 244 */ 248 struct sos_thread * 245 struct sos_thread * 249 sos_duplicate_user_thread(const char *name, 246 sos_duplicate_user_thread(const char *name, 250 struct sos_process * 247 struct sos_process *process, 251 const struct sos_thr 248 const struct sos_thread * model_thread, 252 const struct sos_cpu 249 const struct sos_cpu_state * model_uctxt, 253 sos_ui32_t retval); 250 sos_ui32_t retval); 254 251 255 252 256 /** 253 /** 257 * Terminate the execution of the current thre 254 * Terminate the execution of the current thread. For kernel threads, 258 * it is called by default when the start rout 255 * it is called by default when the start routine returns. 259 */ 256 */ 260 void sos_thread_exit() __attribute__((noreturn !! 257 void sos_thread_exit(void) __attribute__((noreturn)); 261 258 262 259 263 /** 260 /** 264 * Get the identifier of the thread currently 261 * Get the identifier of the thread currently running on CPU. Trivial 265 * function. 262 * function. 266 */ 263 */ 267 struct sos_thread *sos_thread_get_current(); !! 264 struct sos_thread *sos_thread_get_current(void); 268 265 269 266 270 /** 267 /** 271 * If thr == NULL, set the priority of the cur 268 * If thr == NULL, set the priority of the current thread. Trivial 272 * function. 269 * function. 273 * 270 * 274 * @note NOT protected against interrupts 271 * @note NOT protected against interrupts 275 */ 272 */ 276 sos_sched_priority_t sos_thread_get_priority(s 273 sos_sched_priority_t sos_thread_get_priority(struct sos_thread *thr); 277 274 278 275 279 /** 276 /** 280 * If thr == NULL, get the state of the curren 277 * If thr == NULL, get the state of the current thread. Trivial 281 * function. 278 * function. 282 * 279 * 283 * @note NOT protected against interrupts 280 * @note NOT protected against interrupts 284 */ 281 */ 285 sos_thread_state_t sos_thread_get_state(struct 282 sos_thread_state_t sos_thread_get_state(struct sos_thread *thr); 286 283 287 284 288 /** 285 /** 289 * If thr == NULL, set the priority of the cur 286 * If thr == NULL, set the priority of the current thread 290 * 287 * 291 * @note NO context-switch ever occurs in this 288 * @note NO context-switch ever occurs in this function ! 292 */ 289 */ 293 sos_ret_t sos_thread_set_priority(struct sos_t 290 sos_ret_t sos_thread_set_priority(struct sos_thread *thr, 294 sos_sched_pr 291 sos_sched_priority_t priority); 295 292 296 293 297 /** 294 /** 298 * Yield CPU to another ready thread. 295 * Yield CPU to another ready thread. 299 * 296 * 300 * @note This is a BLOCKING FUNCTION 297 * @note This is a BLOCKING FUNCTION 301 */ 298 */ 302 sos_ret_t sos_thread_yield(); !! 299 sos_ret_t sos_thread_yield(void); 303 300 304 301 305 /** 302 /** 306 * Release the CPU for (at least) the given de 303 * Release the CPU for (at least) the given delay. 307 * 304 * 308 * @param delay The delay to wait for. If dela 305 * @param delay The delay to wait for. If delay == NULL then wait 309 * forever that any event occurs. 306 * forever that any event occurs. 310 * 307 * 311 * @return SOS_OK when delay expired (and dela 308 * @return SOS_OK when delay expired (and delay is reset to zero), 312 * -SOS_EINTR otherwise (and delay contains th 309 * -SOS_EINTR otherwise (and delay contains the amount of time 313 * remaining). 310 * remaining). 314 * 311 * 315 * @note This is a BLOCKING FUNCTION 312 * @note This is a BLOCKING FUNCTION 316 */ 313 */ 317 sos_ret_t sos_thread_sleep(/* in/out */struct 314 sos_ret_t sos_thread_sleep(/* in/out */struct sos_time *delay); 318 315 319 316 320 /** 317 /** 321 * Mark the given thread as READY (if not alre 318 * Mark the given thread as READY (if not already ready) even if it is 322 * blocked in a kwaitq or in a sleep ! As a re 319 * blocked in a kwaitq or in a sleep ! As a result, the interrupted 323 * kwaitq/sleep function call of the thread wi 320 * kwaitq/sleep function call of the thread will return with 324 * -SOS_EINTR. 321 * -SOS_EINTR. 325 * 322 * 326 * @return -SOS_EINVAL if thread does not exis 323 * @return -SOS_EINVAL if thread does not exist, or -SOS_EFATAL if 327 * marked ZOMBIE. 324 * marked ZOMBIE. 328 * 325 * 329 * @note As a result, the semaphore/mutex/cond 326 * @note As a result, the semaphore/mutex/conditions/... functions 330 * return values SHOULD ALWAYS be checked ! If 327 * return values SHOULD ALWAYS be checked ! If they are != SOS_OK, 331 * then the caller should consider that the re 328 * then the caller should consider that the resource is not aquired 332 * because somebody woke the thread by some wa 329 * because somebody woke the thread by some way. 333 */ 330 */ 334 sos_ret_t sos_thread_force_unblock(struct sos_ 331 sos_ret_t sos_thread_force_unblock(struct sos_thread *thread); 335 332 336 /** 333 /** 337 * Dump the backtrace of the current thread to 334 * Dump the backtrace of the current thread to console and/or bochs 338 */ 335 */ 339 void sos_thread_dump_backtrace(sos_bool_t on_c 336 void sos_thread_dump_backtrace(sos_bool_t on_console, 340 sos_bool_t on_b 337 sos_bool_t on_bochs); 341 338 342 339 343 /* ******************************************* 340 /* ********************************************** 344 * Restricted functions 341 * Restricted functions 345 */ 342 */ 346 343 347 344 348 /** 345 /** 349 * Restricted function to indicate that we are 346 * Restricted function to indicate that we are to access the given 350 * user address space from inside the kernel. 347 * user address space from inside the kernel. 351 * 348 * 352 * @param dest_as The address space we want to 349 * @param dest_as The address space we want to access, or NULL to 353 * access current thread's address space 350 * access current thread's address space 354 * 351 * 355 * @param fixup_retvaddr When != 0, then dest_ 352 * @param fixup_retvaddr When != 0, then dest_as MUST BE NULL (we 356 * don't allow controlled access from kernel i 353 * don't allow controlled access from kernel into user space from a 357 * foreign thread). In this case, the page fau 354 * foreign thread). In this case, the page fault handler should accept 358 * page faults from the kernel in user space, 355 * page faults from the kernel in user space, and resolve them in the 359 * usual way. The value in retvaddr is where t 356 * usual way. The value in retvaddr is where the page fault handler 360 * has to return to in case the page fault rem 357 * has to return to in case the page fault remains unresolved. The 361 * address of the faulting address is kept in 358 * address of the faulting address is kept in 362 * éthread->fixup_uaccess.faulted_uaddr 359 * éthread->fixup_uaccess.faulted_uaddr 363 * 360 * 364 * @note typical values for fixup_retvaddr are 361 * @note typical values for fixup_retvaddr are obtained by "Labels as 365 * values" (see gcc's doc: operator "&&"). See 362 * values" (see gcc's doc: operator "&&"). See uaccess.c for example 366 * code. 363 * code. 367 */ 364 */ 368 sos_ret_t 365 sos_ret_t 369 sos_thread_prepare_user_space_access(struct so 366 sos_thread_prepare_user_space_access(struct sos_umem_vmm_as * dest_as, 370 sos_vaddr 367 sos_vaddr_t fixup_retvaddr); 371 368 372 369 373 /** 370 /** 374 * Restricted function to signal we are not ac 371 * Restricted function to signal we are not accessing any user address 375 * space anymore 372 * space anymore 376 */ 373 */ 377 sos_ret_t 374 sos_ret_t 378 sos_thread_end_user_space_access(void); 375 sos_thread_end_user_space_access(void); 379 376 380 377 381 /** 378 /** 382 * Restricted callback called when a syscall g 379 * Restricted callback called when a syscall goes back in user mode, 383 * to reconfigure the MMU to match that of the 380 * to reconfigure the MMU to match that of the current thread's 384 * process MMU context. 381 * process MMU context. 385 * 382 * 386 * @note The use of this function is RESERVED 383 * @note The use of this function is RESERVED to the syscall wrapper 387 */ 384 */ 388 void sos_thread_prepare_syscall_switch_back(st 385 void sos_thread_prepare_syscall_switch_back(struct sos_cpu_state *cpu_state); 389 386 390 387 391 /** 388 /** 392 * Restricted callback called when an exceptio 389 * Restricted callback called when an exception handler goes back to 393 * the interrupted thread to reconfigure the M 390 * the interrupted thread to reconfigure the MMU to match that of the 394 * current thread's process MMU context. 391 * current thread's process MMU context. 395 * 392 * 396 * @note The use of this function is RESERVED 393 * @note The use of this function is RESERVED to the exception wrappers 397 */ 394 */ 398 void sos_thread_prepare_exception_switch_back( 395 void sos_thread_prepare_exception_switch_back(struct sos_cpu_state *cpu_state); 399 396 400 397 401 /** 398 /** 402 * Restricted callback called when an IRQ is e 399 * Restricted callback called when an IRQ is entered while the CPU was 403 * NOT already servicing any other IRQ (ie the 400 * NOT already servicing any other IRQ (ie the outermost IRQ handler 404 * is entered). This callback simply updates t 401 * is entered). This callback simply updates the "cpu_state" field so 405 * that IRQ handlers always know the state of 402 * that IRQ handlers always know the state of the interrupted thread, 406 * even if they are imbricated in other IRQ ha 403 * even if they are imbricated in other IRQ handlers. 407 * 404 * 408 * @note The use of this function is RESERVED 405 * @note The use of this function is RESERVED to the irq wrappers 409 */ 406 */ 410 void 407 void 411 sos_thread_prepare_irq_servicing(struct sos_cp 408 sos_thread_prepare_irq_servicing(struct sos_cpu_state *interrupted_state); 412 409 413 410 414 /** 411 /** 415 * Restricted callback called when the outermo 412 * Restricted callback called when the outermost IRQ handler returns, 416 * to select the thread to return to. This cal 413 * to select the thread to return to. This callbacks implements: 417 * - preemption of user threads in user mode 414 * - preemption of user threads in user mode (time sharing / FIFO) 418 * - non-preemption of user threads in kerne 415 * - non-preemption of user threads in kernel mode (interrupted thread 419 * is restored on CPU "as is") 416 * is restored on CPU "as is") 420 * - non-preemption of kernel threads (same 417 * - non-preemption of kernel threads (same remark) 421 * The MMU is reconfigured correctly to match 418 * The MMU is reconfigured correctly to match the address space of the 422 * selected thread. 419 * selected thread. 423 * 420 * 424 * @return The CPU context of the thread to re 421 * @return The CPU context of the thread to return to 425 * 422 * 426 * @note The use of this function is RESERVED 423 * @note The use of this function is RESERVED to the irq wrappers 427 */ 424 */ 428 struct sos_cpu_state * 425 struct sos_cpu_state * 429 sos_thread_prepare_irq_switch_back(void); 426 sos_thread_prepare_irq_switch_back(void); 430 427 431 428 432 #endif /* _SOS_THREAD_H_ */ 429 #endif /* _SOS_THREAD_H_ */
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