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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/kernel/process.c | |
3 | * | |
4 | * Copyright (C) 1996-2000 Russell King - Converted to ARM. | |
5 | * Original Copyright (C) 1995 Linus Torvalds | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | #include <stdarg.h> | |
12 | ||
1da177e4 LT |
13 | #include <linux/module.h> |
14 | #include <linux/sched.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/mm.h> | |
17 | #include <linux/stddef.h> | |
18 | #include <linux/unistd.h> | |
19 | #include <linux/ptrace.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/user.h> | |
22 | #include <linux/a.out.h> | |
23 | #include <linux/delay.h> | |
24 | #include <linux/reboot.h> | |
25 | #include <linux/interrupt.h> | |
26 | #include <linux/kallsyms.h> | |
27 | #include <linux/init.h> | |
a054a811 | 28 | #include <linux/cpu.h> |
84dff1a7 | 29 | #include <linux/elfcore.h> |
74617fb6 | 30 | #include <linux/pm.h> |
1da177e4 | 31 | |
1da177e4 LT |
32 | #include <asm/leds.h> |
33 | #include <asm/processor.h> | |
78ff18a4 | 34 | #include <asm/system.h> |
d6551e88 | 35 | #include <asm/thread_notify.h> |
1da177e4 | 36 | #include <asm/uaccess.h> |
2ea83398 | 37 | #include <asm/mach/time.h> |
1da177e4 LT |
38 | |
39 | extern const char *processor_modes[]; | |
40 | extern void setup_mm_for_reboot(char mode); | |
41 | ||
42 | static volatile int hlt_counter; | |
43 | ||
44 | #include <asm/arch/system.h> | |
45 | ||
46 | void disable_hlt(void) | |
47 | { | |
48 | hlt_counter++; | |
49 | } | |
50 | ||
51 | EXPORT_SYMBOL(disable_hlt); | |
52 | ||
53 | void enable_hlt(void) | |
54 | { | |
55 | hlt_counter--; | |
56 | } | |
57 | ||
58 | EXPORT_SYMBOL(enable_hlt); | |
59 | ||
60 | static int __init nohlt_setup(char *__unused) | |
61 | { | |
62 | hlt_counter = 1; | |
63 | return 1; | |
64 | } | |
65 | ||
66 | static int __init hlt_setup(char *__unused) | |
67 | { | |
68 | hlt_counter = 0; | |
69 | return 1; | |
70 | } | |
71 | ||
72 | __setup("nohlt", nohlt_setup); | |
73 | __setup("hlt", hlt_setup); | |
74 | ||
74617fb6 RP |
75 | void arm_machine_restart(char mode) |
76 | { | |
77 | /* | |
78 | * Clean and disable cache, and turn off interrupts | |
79 | */ | |
80 | cpu_proc_fin(); | |
81 | ||
82 | /* | |
83 | * Tell the mm system that we are going to reboot - | |
84 | * we may need it to insert some 1:1 mappings so that | |
85 | * soft boot works. | |
86 | */ | |
87 | setup_mm_for_reboot(mode); | |
88 | ||
89 | /* | |
90 | * Now call the architecture specific reboot code. | |
91 | */ | |
92 | arch_reset(mode); | |
93 | ||
94 | /* | |
95 | * Whoops - the architecture was unable to reboot. | |
96 | * Tell the user! | |
97 | */ | |
98 | mdelay(1000); | |
99 | printk("Reboot failed -- System halted\n"); | |
100 | while (1); | |
101 | } | |
102 | ||
1da177e4 | 103 | /* |
74617fb6 | 104 | * Function pointers to optional machine specific functions |
1da177e4 LT |
105 | */ |
106 | void (*pm_idle)(void); | |
107 | EXPORT_SYMBOL(pm_idle); | |
108 | ||
109 | void (*pm_power_off)(void); | |
110 | EXPORT_SYMBOL(pm_power_off); | |
111 | ||
74617fb6 RP |
112 | void (*arm_pm_restart)(char str) = arm_machine_restart; |
113 | EXPORT_SYMBOL_GPL(arm_pm_restart); | |
114 | ||
115 | ||
1da177e4 LT |
116 | /* |
117 | * This is our default idle handler. We need to disable | |
118 | * interrupts here to ensure we don't miss a wakeup call. | |
119 | */ | |
84dff1a7 | 120 | static void default_idle(void) |
1da177e4 | 121 | { |
64c7c8f8 NP |
122 | if (hlt_counter) |
123 | cpu_relax(); | |
124 | else { | |
125 | local_irq_disable(); | |
126 | if (!need_resched()) { | |
127 | timer_dyn_reprogram(); | |
128 | arch_idle(); | |
129 | } | |
130 | local_irq_enable(); | |
2ea83398 | 131 | } |
1da177e4 LT |
132 | } |
133 | ||
134 | /* | |
135 | * The idle thread. We try to conserve power, while trying to keep | |
136 | * overall latency low. The architecture specific idle is passed | |
137 | * a value to indicate the level of "idleness" of the system. | |
138 | */ | |
139 | void cpu_idle(void) | |
140 | { | |
141 | local_fiq_enable(); | |
142 | ||
143 | /* endless idle loop with no priority at all */ | |
144 | while (1) { | |
145 | void (*idle)(void) = pm_idle; | |
a054a811 RK |
146 | |
147 | #ifdef CONFIG_HOTPLUG_CPU | |
148 | if (cpu_is_offline(smp_processor_id())) { | |
149 | leds_event(led_idle_start); | |
150 | cpu_die(); | |
151 | } | |
152 | #endif | |
153 | ||
1da177e4 LT |
154 | if (!idle) |
155 | idle = default_idle; | |
1da177e4 LT |
156 | leds_event(led_idle_start); |
157 | while (!need_resched()) | |
158 | idle(); | |
159 | leds_event(led_idle_end); | |
5bfb5d69 | 160 | preempt_enable_no_resched(); |
1da177e4 | 161 | schedule(); |
5bfb5d69 | 162 | preempt_disable(); |
1da177e4 LT |
163 | } |
164 | } | |
165 | ||
166 | static char reboot_mode = 'h'; | |
167 | ||
168 | int __init reboot_setup(char *str) | |
169 | { | |
170 | reboot_mode = str[0]; | |
171 | return 1; | |
172 | } | |
173 | ||
174 | __setup("reboot=", reboot_setup); | |
175 | ||
176 | void machine_halt(void) | |
177 | { | |
178 | } | |
179 | ||
1da177e4 LT |
180 | |
181 | void machine_power_off(void) | |
182 | { | |
183 | if (pm_power_off) | |
184 | pm_power_off(); | |
185 | } | |
186 | ||
1da177e4 LT |
187 | void machine_restart(char * __unused) |
188 | { | |
74617fb6 | 189 | arm_pm_restart(reboot_mode); |
1da177e4 LT |
190 | } |
191 | ||
652a12ef | 192 | void __show_regs(struct pt_regs *regs) |
1da177e4 | 193 | { |
652a12ef | 194 | unsigned long flags = condition_codes(regs); |
1da177e4 | 195 | |
652a12ef | 196 | printk("CPU: %d\n", smp_processor_id()); |
1da177e4 LT |
197 | print_symbol("PC is at %s\n", instruction_pointer(regs)); |
198 | print_symbol("LR is at %s\n", regs->ARM_lr); | |
199 | printk("pc : [<%08lx>] lr : [<%08lx>] %s\n" | |
200 | "sp : %08lx ip : %08lx fp : %08lx\n", | |
201 | instruction_pointer(regs), | |
202 | regs->ARM_lr, print_tainted(), regs->ARM_sp, | |
203 | regs->ARM_ip, regs->ARM_fp); | |
204 | printk("r10: %08lx r9 : %08lx r8 : %08lx\n", | |
205 | regs->ARM_r10, regs->ARM_r9, | |
206 | regs->ARM_r8); | |
207 | printk("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n", | |
208 | regs->ARM_r7, regs->ARM_r6, | |
209 | regs->ARM_r5, regs->ARM_r4); | |
210 | printk("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n", | |
211 | regs->ARM_r3, regs->ARM_r2, | |
212 | regs->ARM_r1, regs->ARM_r0); | |
213 | printk("Flags: %c%c%c%c", | |
214 | flags & PSR_N_BIT ? 'N' : 'n', | |
215 | flags & PSR_Z_BIT ? 'Z' : 'z', | |
216 | flags & PSR_C_BIT ? 'C' : 'c', | |
217 | flags & PSR_V_BIT ? 'V' : 'v'); | |
218 | printk(" IRQs o%s FIQs o%s Mode %s%s Segment %s\n", | |
219 | interrupts_enabled(regs) ? "n" : "ff", | |
220 | fast_interrupts_enabled(regs) ? "n" : "ff", | |
221 | processor_modes[processor_mode(regs)], | |
222 | thumb_mode(regs) ? " (T)" : "", | |
223 | get_fs() == get_ds() ? "kernel" : "user"); | |
224 | { | |
225 | unsigned int ctrl, transbase, dac; | |
226 | __asm__ ( | |
227 | " mrc p15, 0, %0, c1, c0\n" | |
228 | " mrc p15, 0, %1, c2, c0\n" | |
229 | " mrc p15, 0, %2, c3, c0\n" | |
230 | : "=r" (ctrl), "=r" (transbase), "=r" (dac)); | |
231 | printk("Control: %04X Table: %08X DAC: %08X\n", | |
232 | ctrl, transbase, dac); | |
233 | } | |
234 | } | |
235 | ||
652a12ef RK |
236 | void show_regs(struct pt_regs * regs) |
237 | { | |
238 | printk("\n"); | |
239 | printk("Pid: %d, comm: %20s\n", current->pid, current->comm); | |
240 | __show_regs(regs); | |
241 | __backtrace(); | |
242 | } | |
243 | ||
1da177e4 LT |
244 | void show_fpregs(struct user_fp *regs) |
245 | { | |
246 | int i; | |
247 | ||
248 | for (i = 0; i < 8; i++) { | |
249 | unsigned long *p; | |
250 | char type; | |
251 | ||
252 | p = (unsigned long *)(regs->fpregs + i); | |
253 | ||
254 | switch (regs->ftype[i]) { | |
255 | case 1: type = 'f'; break; | |
256 | case 2: type = 'd'; break; | |
257 | case 3: type = 'e'; break; | |
258 | default: type = '?'; break; | |
259 | } | |
260 | if (regs->init_flag) | |
261 | type = '?'; | |
262 | ||
263 | printk(" f%d(%c): %08lx %08lx %08lx%c", | |
264 | i, type, p[0], p[1], p[2], i & 1 ? '\n' : ' '); | |
265 | } | |
266 | ||
267 | ||
268 | printk("FPSR: %08lx FPCR: %08lx\n", | |
269 | (unsigned long)regs->fpsr, | |
270 | (unsigned long)regs->fpcr); | |
271 | } | |
272 | ||
273 | /* | |
274 | * Task structure and kernel stack allocation. | |
275 | */ | |
1929ab8c RK |
276 | struct thread_info_list { |
277 | unsigned long *head; | |
278 | unsigned int nr; | |
279 | }; | |
280 | ||
281 | static DEFINE_PER_CPU(struct thread_info_list, thread_info_list) = { NULL, 0 }; | |
1da177e4 LT |
282 | |
283 | #define EXTRA_TASK_STRUCT 4 | |
1da177e4 LT |
284 | |
285 | struct thread_info *alloc_thread_info(struct task_struct *task) | |
286 | { | |
287 | struct thread_info *thread = NULL; | |
288 | ||
289 | if (EXTRA_TASK_STRUCT) { | |
1929ab8c RK |
290 | struct thread_info_list *th = &get_cpu_var(thread_info_list); |
291 | unsigned long *p = th->head; | |
1da177e4 LT |
292 | |
293 | if (p) { | |
1929ab8c RK |
294 | th->head = (unsigned long *)p[0]; |
295 | th->nr -= 1; | |
1da177e4 | 296 | } |
1929ab8c RK |
297 | put_cpu_var(thread_info_list); |
298 | ||
1da177e4 LT |
299 | thread = (struct thread_info *)p; |
300 | } | |
301 | ||
302 | if (!thread) | |
4f7a1812 RK |
303 | thread = (struct thread_info *) |
304 | __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER); | |
1da177e4 | 305 | |
4f7a1812 | 306 | #ifdef CONFIG_DEBUG_STACK_USAGE |
1da177e4 LT |
307 | /* |
308 | * The stack must be cleared if you want SYSRQ-T to | |
309 | * give sensible stack usage information | |
310 | */ | |
4f7a1812 RK |
311 | if (thread) |
312 | memzero(thread, THREAD_SIZE); | |
1da177e4 LT |
313 | #endif |
314 | return thread; | |
315 | } | |
316 | ||
317 | void free_thread_info(struct thread_info *thread) | |
318 | { | |
1929ab8c RK |
319 | if (EXTRA_TASK_STRUCT) { |
320 | struct thread_info_list *th = &get_cpu_var(thread_info_list); | |
321 | if (th->nr < EXTRA_TASK_STRUCT) { | |
322 | unsigned long *p = (unsigned long *)thread; | |
9d494ccb | 323 | p[0] = (unsigned long)th->head; |
1929ab8c RK |
324 | th->head = p; |
325 | th->nr += 1; | |
326 | put_cpu_var(thread_info_list); | |
327 | return; | |
328 | } | |
329 | put_cpu_var(thread_info_list); | |
330 | } | |
331 | free_pages((unsigned long)thread, THREAD_SIZE_ORDER); | |
1da177e4 LT |
332 | } |
333 | ||
334 | /* | |
335 | * Free current thread data structures etc.. | |
336 | */ | |
337 | void exit_thread(void) | |
338 | { | |
339 | } | |
340 | ||
d6551e88 | 341 | ATOMIC_NOTIFIER_HEAD(thread_notify_head); |
1da177e4 | 342 | |
d6551e88 | 343 | EXPORT_SYMBOL_GPL(thread_notify_head); |
1da177e4 LT |
344 | |
345 | void flush_thread(void) | |
346 | { | |
347 | struct thread_info *thread = current_thread_info(); | |
348 | struct task_struct *tsk = current; | |
349 | ||
350 | memset(thread->used_cp, 0, sizeof(thread->used_cp)); | |
351 | memset(&tsk->thread.debug, 0, sizeof(struct debug_info)); | |
d6551e88 RK |
352 | memset(&thread->fpstate, 0, sizeof(union fp_state)); |
353 | ||
354 | thread_notify(THREAD_NOTIFY_FLUSH, thread); | |
1da177e4 LT |
355 | #if defined(CONFIG_IWMMXT) |
356 | iwmmxt_task_release(thread); | |
1da177e4 LT |
357 | #endif |
358 | } | |
359 | ||
360 | void release_thread(struct task_struct *dead_task) | |
361 | { | |
d6551e88 RK |
362 | struct thread_info *thread = task_thread_info(dead_task); |
363 | ||
364 | thread_notify(THREAD_NOTIFY_RELEASE, thread); | |
1da177e4 | 365 | #if defined(CONFIG_IWMMXT) |
d6551e88 | 366 | iwmmxt_task_release(thread); |
1da177e4 LT |
367 | #endif |
368 | } | |
369 | ||
370 | asmlinkage void ret_from_fork(void) __asm__("ret_from_fork"); | |
371 | ||
372 | int | |
373 | copy_thread(int nr, unsigned long clone_flags, unsigned long stack_start, | |
374 | unsigned long stk_sz, struct task_struct *p, struct pt_regs *regs) | |
375 | { | |
815d5ec8 AV |
376 | struct thread_info *thread = task_thread_info(p); |
377 | struct pt_regs *childregs = task_pt_regs(p); | |
1da177e4 | 378 | |
1da177e4 LT |
379 | *childregs = *regs; |
380 | childregs->ARM_r0 = 0; | |
381 | childregs->ARM_sp = stack_start; | |
382 | ||
383 | memset(&thread->cpu_context, 0, sizeof(struct cpu_context_save)); | |
384 | thread->cpu_context.sp = (unsigned long)childregs; | |
385 | thread->cpu_context.pc = (unsigned long)ret_from_fork; | |
386 | ||
387 | if (clone_flags & CLONE_SETTLS) | |
388 | thread->tp_value = regs->ARM_r3; | |
389 | ||
390 | return 0; | |
391 | } | |
392 | ||
393 | /* | |
394 | * fill in the fpe structure for a core dump... | |
395 | */ | |
396 | int dump_fpu (struct pt_regs *regs, struct user_fp *fp) | |
397 | { | |
398 | struct thread_info *thread = current_thread_info(); | |
399 | int used_math = thread->used_cp[1] | thread->used_cp[2]; | |
400 | ||
401 | if (used_math) | |
402 | memcpy(fp, &thread->fpstate.soft, sizeof (*fp)); | |
403 | ||
404 | return used_math != 0; | |
405 | } | |
406 | EXPORT_SYMBOL(dump_fpu); | |
407 | ||
408 | /* | |
409 | * fill in the user structure for a core dump.. | |
410 | */ | |
411 | void dump_thread(struct pt_regs * regs, struct user * dump) | |
412 | { | |
413 | struct task_struct *tsk = current; | |
414 | ||
415 | dump->magic = CMAGIC; | |
416 | dump->start_code = tsk->mm->start_code; | |
417 | dump->start_stack = regs->ARM_sp & ~(PAGE_SIZE - 1); | |
418 | ||
419 | dump->u_tsize = (tsk->mm->end_code - tsk->mm->start_code) >> PAGE_SHIFT; | |
420 | dump->u_dsize = (tsk->mm->brk - tsk->mm->start_data + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
421 | dump->u_ssize = 0; | |
422 | ||
423 | dump->u_debugreg[0] = tsk->thread.debug.bp[0].address; | |
424 | dump->u_debugreg[1] = tsk->thread.debug.bp[1].address; | |
425 | dump->u_debugreg[2] = tsk->thread.debug.bp[0].insn.arm; | |
426 | dump->u_debugreg[3] = tsk->thread.debug.bp[1].insn.arm; | |
427 | dump->u_debugreg[4] = tsk->thread.debug.nsaved; | |
428 | ||
429 | if (dump->start_stack < 0x04000000) | |
430 | dump->u_ssize = (0x04000000 - dump->start_stack) >> PAGE_SHIFT; | |
431 | ||
432 | dump->regs = *regs; | |
433 | dump->u_fpvalid = dump_fpu (regs, &dump->u_fp); | |
434 | } | |
435 | EXPORT_SYMBOL(dump_thread); | |
436 | ||
437 | /* | |
438 | * Shuffle the argument into the correct register before calling the | |
439 | * thread function. r1 is the thread argument, r2 is the pointer to | |
440 | * the thread function, and r3 points to the exit function. | |
441 | */ | |
442 | extern void kernel_thread_helper(void); | |
443 | asm( ".section .text\n" | |
444 | " .align\n" | |
445 | " .type kernel_thread_helper, #function\n" | |
446 | "kernel_thread_helper:\n" | |
447 | " mov r0, r1\n" | |
448 | " mov lr, r3\n" | |
449 | " mov pc, r2\n" | |
450 | " .size kernel_thread_helper, . - kernel_thread_helper\n" | |
451 | " .previous"); | |
452 | ||
453 | /* | |
454 | * Create a kernel thread. | |
455 | */ | |
456 | pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags) | |
457 | { | |
458 | struct pt_regs regs; | |
459 | ||
460 | memset(®s, 0, sizeof(regs)); | |
461 | ||
462 | regs.ARM_r1 = (unsigned long)arg; | |
463 | regs.ARM_r2 = (unsigned long)fn; | |
464 | regs.ARM_r3 = (unsigned long)do_exit; | |
465 | regs.ARM_pc = (unsigned long)kernel_thread_helper; | |
466 | regs.ARM_cpsr = SVC_MODE; | |
467 | ||
468 | return do_fork(flags|CLONE_VM|CLONE_UNTRACED, 0, ®s, 0, NULL, NULL); | |
469 | } | |
470 | EXPORT_SYMBOL(kernel_thread); | |
471 | ||
472 | unsigned long get_wchan(struct task_struct *p) | |
473 | { | |
474 | unsigned long fp, lr; | |
4f7a1812 | 475 | unsigned long stack_start, stack_end; |
1da177e4 LT |
476 | int count = 0; |
477 | if (!p || p == current || p->state == TASK_RUNNING) | |
478 | return 0; | |
479 | ||
55205823 | 480 | stack_start = (unsigned long)end_of_stack(p); |
32d39a93 | 481 | stack_end = (unsigned long)task_stack_page(p) + THREAD_SIZE; |
4f7a1812 | 482 | |
1da177e4 LT |
483 | fp = thread_saved_fp(p); |
484 | do { | |
4f7a1812 | 485 | if (fp < stack_start || fp > stack_end) |
1da177e4 LT |
486 | return 0; |
487 | lr = pc_pointer (((unsigned long *)fp)[-1]); | |
488 | if (!in_sched_functions(lr)) | |
489 | return lr; | |
490 | fp = *(unsigned long *) (fp - 12); | |
491 | } while (count ++ < 16); | |
492 | return 0; | |
493 | } |