This source file includes following definitions.
- add_wait_queue
- remove_wait_queue
- select_wait
- _get_base
- get_limit
1 #ifndef _LINUX_SCHED_H
2 #define _LINUX_SCHED_H
3
4 #define NEW_SWAP
5
6
7
8
9
10
11
12
13
14 #define HZ 100
15
16 #include <linux/tasks.h>
17 #include <asm/system.h>
18
19
20
21
22
23 #define TASK_SIZE 0xc0000000
24
25
26
27
28 #define IO_BITMAP_SIZE 32
29
30
31
32
33
34
35
36
37
38
39
40 extern unsigned long avenrun[];
41
42 #define FSHIFT 11
43 #define FIXED_1 (1<<FSHIFT)
44 #define LOAD_FREQ (5*HZ)
45 #define EXP_1 1884
46 #define EXP_5 2014
47 #define EXP_15 2037
48
49 #define CALC_LOAD(load,exp,n) \
50 load *= exp; \
51 load += n*(FIXED_1-exp); \
52 load >>= FSHIFT;
53
54 #define CT_TO_SECS(x) ((x) / HZ)
55 #define CT_TO_USECS(x) (((x) % HZ) * 1000000/HZ)
56
57 #define FIRST_TASK task[0]
58 #define LAST_TASK task[NR_TASKS-1]
59
60 #include <linux/head.h>
61 #include <linux/fs.h>
62 #include <linux/mm.h>
63 #include <linux/signal.h>
64 #include <linux/time.h>
65 #include <linux/param.h>
66 #include <linux/resource.h>
67 #include <linux/vm86.h>
68 #include <linux/math_emu.h>
69
70 #define TASK_RUNNING 0
71 #define TASK_INTERRUPTIBLE 1
72 #define TASK_UNINTERRUPTIBLE 2
73 #define TASK_ZOMBIE 3
74 #define TASK_STOPPED 4
75 #define TASK_SWAPPING 5
76
77 #ifndef NULL
78 #define NULL ((void *) 0)
79 #endif
80
81 #ifdef __KERNEL__
82
83 extern void sched_init(void);
84 extern void show_state(void);
85 extern void trap_init(void);
86 extern void panic(const char * fmt, ...)
87 __attribute__ ((format (printf, 1, 2)));
88
89 asmlinkage void schedule(void);
90
91 #endif
92
93 struct i387_hard_struct {
94 long cwd;
95 long swd;
96 long twd;
97 long fip;
98 long fcs;
99 long foo;
100 long fos;
101 long st_space[20];
102 };
103
104 struct i387_soft_struct {
105 long cwd;
106 long swd;
107 long twd;
108 long fip;
109 long fcs;
110 long foo;
111 long fos;
112 long top;
113 struct fpu_reg regs[8];
114 unsigned char lookahead;
115 struct info *info;
116 unsigned long entry_eip;
117 };
118
119 union i387_union {
120 struct i387_hard_struct hard;
121 struct i387_soft_struct soft;
122 };
123
124 struct tss_struct {
125 unsigned short back_link,__blh;
126 unsigned long esp0;
127 unsigned short ss0,__ss0h;
128 unsigned long esp1;
129 unsigned short ss1,__ss1h;
130 unsigned long esp2;
131 unsigned short ss2,__ss2h;
132 unsigned long cr3;
133 unsigned long eip;
134 unsigned long eflags;
135 unsigned long eax,ecx,edx,ebx;
136 unsigned long esp;
137 unsigned long ebp;
138 unsigned long esi;
139 unsigned long edi;
140 unsigned short es, __esh;
141 unsigned short cs, __csh;
142 unsigned short ss, __ssh;
143 unsigned short ds, __dsh;
144 unsigned short fs, __fsh;
145 unsigned short gs, __gsh;
146 unsigned short ldt, __ldth;
147 unsigned short trace, bitmap;
148 unsigned long io_bitmap[IO_BITMAP_SIZE+1];
149 unsigned long tr;
150 union i387_union i387;
151 };
152
153 struct task_struct {
154
155 long state;
156 long counter;
157 long priority;
158 unsigned long signal;
159 unsigned long blocked;
160 unsigned long flags;
161 int errno;
162
163 struct task_struct *next_task, *prev_task;
164 struct sigaction sigaction[32];
165 unsigned long saved_kernel_stack;
166 unsigned long kernel_stack_page;
167 int exit_code, exit_signal;
168 int elf_executable:1;
169 int dumpable:1;
170 int swappable:1;
171 unsigned long start_code,end_code,end_data,start_brk,brk,start_stack,start_mmap;
172 unsigned long arg_start, arg_end, env_start, env_end;
173 long pid,pgrp,session,leader;
174 int groups[NGROUPS];
175
176
177
178
179
180 struct task_struct *p_opptr,*p_pptr, *p_cptr, *p_ysptr, *p_osptr;
181 struct wait_queue *wait_chldexit;
182
183
184
185
186 unsigned short uid,euid,suid;
187 unsigned short gid,egid,sgid;
188 unsigned long timeout;
189 unsigned long it_real_value, it_prof_value, it_virt_value;
190 unsigned long it_real_incr, it_prof_incr, it_virt_incr;
191 long utime,stime,cutime,cstime,start_time;
192 unsigned long min_flt, maj_flt;
193 unsigned long cmin_flt, cmaj_flt;
194 struct rlimit rlim[RLIM_NLIMITS];
195 unsigned short used_math;
196 unsigned short rss;
197 char comm[16];
198 struct vm86_struct * vm86_info;
199 unsigned long screen_bitmap;
200
201 int link_count;
202 int tty;
203 unsigned short umask;
204 struct inode * pwd;
205 struct inode * root;
206 struct inode * executable;
207 struct vm_area_struct * mmap;
208 struct shm_desc *shm;
209 struct sem_undo *semun;
210 struct file * filp[NR_OPEN];
211 fd_set close_on_exec;
212
213 struct desc_struct *ldt;
214
215 struct tss_struct tss;
216 #ifdef NEW_SWAP
217 unsigned long old_maj_flt;
218 unsigned long dec_flt;
219 unsigned long swap_cnt;
220 short swap_table;
221 short swap_page;
222 #endif NEW_SWAP
223 };
224
225
226
227
228 #define PF_ALIGNWARN 0x00000001
229
230 #define PF_PTRACED 0x00000010
231 #define PF_TRACESYS 0x00000020
232
233
234
235
236 #define CSIGNAL 0x000000ff
237 #define COPYVM 0x00000100
238 #define COPYFD 0x00000200
239
240
241
242
243
244 #define INIT_TASK \
245 { 0,15,15,0,0,0,0, \
246 &init_task,&init_task, \
247 {{ 0, },}, \
248 0,0, \
249 0,0,0,0,0,0,0,0,0,0,0,0, \
250 0,0,0,0, \
251 0,0,0,0, \
252 {NOGROUP,}, \
253 &init_task,&init_task,NULL,NULL,NULL,NULL, \
254 0,0,0,0,0,0, \
255 0,0,0,0,0,0,0,0,0,0,0,0, \
256 0,0,0,0, \
257 { {LONG_MAX, LONG_MAX}, {LONG_MAX, LONG_MAX}, \
258 {LONG_MAX, LONG_MAX}, {LONG_MAX, LONG_MAX}, \
259 { 0, LONG_MAX}, {LONG_MAX, LONG_MAX}}, \
260 0, \
261 2, \
262 "swapper", \
263 NULL, 0, \
264 0,-1,0022,NULL,NULL,NULL,NULL, \
265 NULL, NULL, \
266 {NULL,}, \
267 {{ 0, }}, \
268 NULL, \
269 {0,0, \
270 sizeof(init_kernel_stack) + (long) &init_kernel_stack, KERNEL_DS, 0, \
271 0,0,0,0,0,0, \
272 (long) &swapper_pg_dir, \
273 0,0,0,0,0,0,0,0,0,0, \
274 USER_DS,0,USER_DS,0,USER_DS,0,USER_DS,0,USER_DS,0,USER_DS,0, \
275 _LDT(0),0, \
276 0, 0x8000, \
277 {~0, }, \
278 _TSS(0), \
279 { { 0, }, } \
280 } \
281 }
282
283 extern struct task_struct init_task;
284 extern struct task_struct *task[NR_TASKS];
285 extern struct task_struct *last_task_used_math;
286 extern struct task_struct *current;
287 extern unsigned long volatile jiffies;
288 extern unsigned long startup_time;
289 extern int jiffies_offset;
290 extern int need_resched;
291
292 extern int hard_math;
293 extern int x86;
294 extern int ignore_irq13;
295 extern int wp_works_ok;
296
297 #define CURRENT_TIME (startup_time+(jiffies+jiffies_offset)/HZ)
298
299 extern void sleep_on(struct wait_queue ** p);
300 extern void interruptible_sleep_on(struct wait_queue ** p);
301 extern void wake_up(struct wait_queue ** p);
302 extern void wake_up_interruptible(struct wait_queue ** p);
303
304 extern void notify_parent(struct task_struct * tsk);
305 extern int send_sig(unsigned long sig,struct task_struct * p,int priv);
306 extern int in_group_p(gid_t grp);
307
308 extern int request_irq(unsigned int irq,void (*handler)(int));
309 extern void free_irq(unsigned int irq);
310 extern int irqaction(unsigned int irq,struct sigaction * sa);
311
312
313
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315
316
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320
321
322
323
324
325 #define FIRST_TSS_ENTRY 8
326 #define FIRST_LDT_ENTRY (FIRST_TSS_ENTRY+1)
327 #define _TSS(n) ((((unsigned long) n)<<4)+(FIRST_TSS_ENTRY<<3))
328 #define _LDT(n) ((((unsigned long) n)<<4)+(FIRST_LDT_ENTRY<<3))
329 #define load_TR(n) __asm__("ltr %%ax": :"a" (_TSS(n)))
330 #define load_ldt(n) __asm__("lldt %%ax": :"a" (_LDT(n)))
331 #define store_TR(n) \
332 __asm__("str %%ax\n\t" \
333 "subl %2,%%eax\n\t" \
334 "shrl $4,%%eax" \
335 :"=a" (n) \
336 :"0" (0),"i" (FIRST_TSS_ENTRY<<3))
337
338
339
340
341
342
343 #define switch_to(tsk) \
344 __asm__("cmpl %%ecx,_current\n\t" \
345 "je 1f\n\t" \
346 "cli\n\t" \
347 "xchgl %%ecx,_current\n\t" \
348 "ljmp %0\n\t" \
349 "sti\n\t" \
350 "cmpl %%ecx,_last_task_used_math\n\t" \
351 "jne 1f\n\t" \
352 "clts\n" \
353 "1:" \
354 : \
355 :"m" (*(((char *)&tsk->tss.tr)-4)), \
356 "c" (tsk) \
357 :"cx")
358
359 #define _set_base(addr,base) \
360 __asm__("movw %%dx,%0\n\t" \
361 "rorl $16,%%edx\n\t" \
362 "movb %%dl,%1\n\t" \
363 "movb %%dh,%2" \
364 : \
365 :"m" (*((addr)+2)), \
366 "m" (*((addr)+4)), \
367 "m" (*((addr)+7)), \
368 "d" (base) \
369 :"dx")
370
371 #define _set_limit(addr,limit) \
372 __asm__("movw %%dx,%0\n\t" \
373 "rorl $16,%%edx\n\t" \
374 "movb %1,%%dh\n\t" \
375 "andb $0xf0,%%dh\n\t" \
376 "orb %%dh,%%dl\n\t" \
377 "movb %%dl,%1" \
378 : \
379 :"m" (*(addr)), \
380 "m" (*((addr)+6)), \
381 "d" (limit) \
382 :"dx")
383
384 #define set_base(ldt,base) _set_base( ((char *)&(ldt)) , base )
385 #define set_limit(ldt,limit) _set_limit( ((char *)&(ldt)) , (limit-1)>>12 )
386
387
388
389
390
391
392 extern inline void add_wait_queue(struct wait_queue ** p, struct wait_queue * wait)
393 {
394 unsigned long flags;
395
396 #ifdef DEBUG
397 if (wait->next) {
398 unsigned long pc;
399 __asm__ __volatile__("call 1f\n"
400 "1:\tpopl %0":"=r" (pc));
401 printk("add_wait_queue (%08x): wait->next = %08x\n",pc,wait->next);
402 }
403 #endif
404 save_flags(flags);
405 cli();
406 if (!*p) {
407 wait->next = wait;
408 *p = wait;
409 } else {
410 wait->next = (*p)->next;
411 (*p)->next = wait;
412 }
413 restore_flags(flags);
414 }
415
416 extern inline void remove_wait_queue(struct wait_queue ** p, struct wait_queue * wait)
417 {
418 unsigned long flags;
419 struct wait_queue * tmp;
420 #ifdef DEBUG
421 unsigned long ok = 0;
422 #endif
423
424 save_flags(flags);
425 cli();
426 if ((*p == wait) &&
427 #ifdef DEBUG
428 (ok = 1) &&
429 #endif
430 ((*p = wait->next) == wait)) {
431 *p = NULL;
432 } else {
433 tmp = wait;
434 while (tmp->next != wait) {
435 tmp = tmp->next;
436 #ifdef DEBUG
437 if (tmp == *p)
438 ok = 1;
439 #endif
440 }
441 tmp->next = wait->next;
442 }
443 wait->next = NULL;
444 restore_flags(flags);
445 #ifdef DEBUG
446 if (!ok) {
447 printk("removed wait_queue not on list.\n");
448 printk("list = %08x, queue = %08x\n",p,wait);
449 __asm__("call 1f\n1:\tpopl %0":"=r" (ok));
450 printk("eip = %08x\n",ok);
451 }
452 #endif
453 }
454
455 extern inline void select_wait(struct wait_queue ** wait_address, select_table * p)
456 {
457 struct select_table_entry * entry;
458
459 if (!p || !wait_address)
460 return;
461 if (p->nr >= __MAX_SELECT_TABLE_ENTRIES)
462 return;
463 entry = p->entry + p->nr;
464 entry->wait_address = wait_address;
465 entry->wait.task = current;
466 entry->wait.next = NULL;
467 add_wait_queue(wait_address,&entry->wait);
468 p->nr++;
469 }
470
471 static inline unsigned long _get_base(char * addr)
472 {
473 unsigned long __base;
474 __asm__("movb %3,%%dh\n\t"
475 "movb %2,%%dl\n\t"
476 "shll $16,%%edx\n\t"
477 "movw %1,%%dx"
478 :"=&d" (__base)
479 :"m" (*((addr)+2)),
480 "m" (*((addr)+4)),
481 "m" (*((addr)+7)));
482 return __base;
483 }
484
485 #define get_base(ldt) _get_base( ((char *)&(ldt)) )
486
487 static inline unsigned long get_limit(unsigned long segment)
488 {
489 unsigned long __limit;
490 __asm__("lsll %1,%0"
491 :"=r" (__limit):"r" (segment));
492 return __limit+1;
493 }
494
495 #define REMOVE_LINKS(p) do { unsigned long flags; \
496 save_flags(flags) ; cli(); \
497 (p)->next_task->prev_task = (p)->prev_task; \
498 (p)->prev_task->next_task = (p)->next_task; \
499 restore_flags(flags); \
500 if ((p)->p_osptr) \
501 (p)->p_osptr->p_ysptr = (p)->p_ysptr; \
502 if ((p)->p_ysptr) \
503 (p)->p_ysptr->p_osptr = (p)->p_osptr; \
504 else \
505 (p)->p_pptr->p_cptr = (p)->p_osptr; \
506 } while (0)
507
508 #define SET_LINKS(p) do { unsigned long flags; \
509 save_flags(flags); cli(); \
510 (p)->next_task = &init_task; \
511 (p)->prev_task = init_task.prev_task; \
512 init_task.prev_task->next_task = (p); \
513 init_task.prev_task = (p); \
514 restore_flags(flags); \
515 (p)->p_ysptr = NULL; \
516 if (((p)->p_osptr = (p)->p_pptr->p_cptr) != NULL) \
517 (p)->p_osptr->p_ysptr = p; \
518 (p)->p_pptr->p_cptr = p; \
519 } while (0)
520
521 #define for_each_task(p) \
522 for (p = &init_task ; (p = p->next_task) != &init_task ; )
523
524
525
526
527
528 extern struct desc_struct default_ldt;
529
530 #endif