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2 * linux/arch/arm/kernel/process.c
4 * Copyright (C) 1996-2000 Russell King - Converted to ARM.
5 * Original Copyright (C) 1995 Linus Torvalds
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.
13 #include <linux/module.h>
14 #include <linux/sched.h>
15 #include <linux/kernel.h>
17 #include <linux/stddef.h>
18 #include <linux/unistd.h>
19 #include <linux/slab.h>
20 #include <linux/user.h>
21 #include <linux/a.out.h>
22 #include <linux/delay.h>
23 #include <linux/reboot.h>
24 #include <linux/interrupt.h>
25 #include <linux/kallsyms.h>
26 #include <linux/init.h>
27 #include <linux/cpu.h>
28 #include <linux/elfcore.h>
30 #include <linux/tick.h>
33 #include <asm/processor.h>
34 #include <asm/system.h>
35 #include <asm/thread_notify.h>
36 #include <asm/uaccess.h>
37 #include <asm/mach/time.h>
39 static const char *processor_modes
[] = {
40 "USER_26", "FIQ_26" , "IRQ_26" , "SVC_26" , "UK4_26" , "UK5_26" , "UK6_26" , "UK7_26" ,
41 "UK8_26" , "UK9_26" , "UK10_26", "UK11_26", "UK12_26", "UK13_26", "UK14_26", "UK15_26",
42 "USER_32", "FIQ_32" , "IRQ_32" , "SVC_32" , "UK4_32" , "UK5_32" , "UK6_32" , "ABT_32" ,
43 "UK8_32" , "UK9_32" , "UK10_32", "UND_32" , "UK12_32", "UK13_32", "UK14_32", "SYS_32"
46 extern void setup_mm_for_reboot(char mode
);
48 static volatile int hlt_counter
;
50 #include <asm/arch/system.h>
52 void disable_hlt(void)
57 EXPORT_SYMBOL(disable_hlt
);
64 EXPORT_SYMBOL(enable_hlt
);
66 static int __init
nohlt_setup(char *__unused
)
72 static int __init
hlt_setup(char *__unused
)
78 __setup("nohlt", nohlt_setup
);
79 __setup("hlt", hlt_setup
);
81 void arm_machine_restart(char mode
)
84 * Clean and disable cache, and turn off interrupts
89 * Tell the mm system that we are going to reboot -
90 * we may need it to insert some 1:1 mappings so that
93 setup_mm_for_reboot(mode
);
96 * Now call the architecture specific reboot code.
101 * Whoops - the architecture was unable to reboot.
105 printk("Reboot failed -- System halted\n");
110 * Function pointers to optional machine specific functions
112 void (*pm_idle
)(void);
113 EXPORT_SYMBOL(pm_idle
);
115 void (*pm_power_off
)(void);
116 EXPORT_SYMBOL(pm_power_off
);
118 void (*arm_pm_restart
)(char str
) = arm_machine_restart
;
119 EXPORT_SYMBOL_GPL(arm_pm_restart
);
123 * This is our default idle handler. We need to disable
124 * interrupts here to ensure we don't miss a wakeup call.
126 static void default_idle(void)
132 if (!need_resched()) {
133 timer_dyn_reprogram();
141 * The idle thread. We try to conserve power, while trying to keep
142 * overall latency low. The architecture specific idle is passed
143 * a value to indicate the level of "idleness" of the system.
149 /* endless idle loop with no priority at all */
151 void (*idle
)(void) = pm_idle
;
153 #ifdef CONFIG_HOTPLUG_CPU
154 if (cpu_is_offline(smp_processor_id())) {
155 leds_event(led_idle_start
);
162 leds_event(led_idle_start
);
163 tick_nohz_stop_sched_tick();
164 while (!need_resched())
166 leds_event(led_idle_end
);
167 tick_nohz_restart_sched_tick();
168 preempt_enable_no_resched();
174 static char reboot_mode
= 'h';
176 int __init
reboot_setup(char *str
)
178 reboot_mode
= str
[0];
182 __setup("reboot=", reboot_setup
);
184 void machine_halt(void)
189 void machine_power_off(void)
195 void machine_restart(char * __unused
)
197 arm_pm_restart(reboot_mode
);
200 void __show_regs(struct pt_regs
*regs
)
202 unsigned long flags
= condition_codes(regs
);
204 printk("CPU: %d\n", smp_processor_id());
205 print_symbol("PC is at %s\n", instruction_pointer(regs
));
206 print_symbol("LR is at %s\n", regs
->ARM_lr
);
207 printk("pc : [<%08lx>] lr : [<%08lx>] %s\n"
208 "sp : %08lx ip : %08lx fp : %08lx\n",
209 instruction_pointer(regs
),
210 regs
->ARM_lr
, print_tainted(), regs
->ARM_sp
,
211 regs
->ARM_ip
, regs
->ARM_fp
);
212 printk("r10: %08lx r9 : %08lx r8 : %08lx\n",
213 regs
->ARM_r10
, regs
->ARM_r9
,
215 printk("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n",
216 regs
->ARM_r7
, regs
->ARM_r6
,
217 regs
->ARM_r5
, regs
->ARM_r4
);
218 printk("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n",
219 regs
->ARM_r3
, regs
->ARM_r2
,
220 regs
->ARM_r1
, regs
->ARM_r0
);
221 printk("Flags: %c%c%c%c",
222 flags
& PSR_N_BIT
? 'N' : 'n',
223 flags
& PSR_Z_BIT
? 'Z' : 'z',
224 flags
& PSR_C_BIT
? 'C' : 'c',
225 flags
& PSR_V_BIT
? 'V' : 'v');
226 printk(" IRQs o%s FIQs o%s Mode %s%s Segment %s\n",
227 interrupts_enabled(regs
) ? "n" : "ff",
228 fast_interrupts_enabled(regs
) ? "n" : "ff",
229 processor_modes
[processor_mode(regs
)],
230 thumb_mode(regs
) ? " (T)" : "",
231 get_fs() == get_ds() ? "kernel" : "user");
236 " mrc p15, 0, %0, c1, c0\n"
238 printk("Control: %04X\n", ctrl
);
240 #ifdef CONFIG_CPU_CP15_MMU
242 unsigned int transbase
, dac
;
244 " mrc p15, 0, %0, c2, c0\n"
245 " mrc p15, 0, %1, c3, c0\n"
246 : "=r" (transbase
), "=r" (dac
));
247 printk("Table: %08X DAC: %08X\n",
254 void show_regs(struct pt_regs
* regs
)
257 printk("Pid: %d, comm: %20s\n", current
->pid
, current
->comm
);
262 void show_fpregs(struct user_fp
*regs
)
266 for (i
= 0; i
< 8; i
++) {
270 p
= (unsigned long *)(regs
->fpregs
+ i
);
272 switch (regs
->ftype
[i
]) {
273 case 1: type
= 'f'; break;
274 case 2: type
= 'd'; break;
275 case 3: type
= 'e'; break;
276 default: type
= '?'; break;
281 printk(" f%d(%c): %08lx %08lx %08lx%c",
282 i
, type
, p
[0], p
[1], p
[2], i
& 1 ? '\n' : ' ');
286 printk("FPSR: %08lx FPCR: %08lx\n",
287 (unsigned long)regs
->fpsr
,
288 (unsigned long)regs
->fpcr
);
292 * Free current thread data structures etc..
294 void exit_thread(void)
298 ATOMIC_NOTIFIER_HEAD(thread_notify_head
);
300 EXPORT_SYMBOL_GPL(thread_notify_head
);
302 void flush_thread(void)
304 struct thread_info
*thread
= current_thread_info();
305 struct task_struct
*tsk
= current
;
307 memset(thread
->used_cp
, 0, sizeof(thread
->used_cp
));
308 memset(&tsk
->thread
.debug
, 0, sizeof(struct debug_info
));
309 memset(&thread
->fpstate
, 0, sizeof(union fp_state
));
311 thread_notify(THREAD_NOTIFY_FLUSH
, thread
);
314 void release_thread(struct task_struct
*dead_task
)
316 struct thread_info
*thread
= task_thread_info(dead_task
);
318 thread_notify(THREAD_NOTIFY_RELEASE
, thread
);
321 asmlinkage
void ret_from_fork(void) __asm__("ret_from_fork");
324 copy_thread(int nr
, unsigned long clone_flags
, unsigned long stack_start
,
325 unsigned long stk_sz
, struct task_struct
*p
, struct pt_regs
*regs
)
327 struct thread_info
*thread
= task_thread_info(p
);
328 struct pt_regs
*childregs
= task_pt_regs(p
);
331 childregs
->ARM_r0
= 0;
332 childregs
->ARM_sp
= stack_start
;
334 memset(&thread
->cpu_context
, 0, sizeof(struct cpu_context_save
));
335 thread
->cpu_context
.sp
= (unsigned long)childregs
;
336 thread
->cpu_context
.pc
= (unsigned long)ret_from_fork
;
338 if (clone_flags
& CLONE_SETTLS
)
339 thread
->tp_value
= regs
->ARM_r3
;
345 * fill in the fpe structure for a core dump...
347 int dump_fpu (struct pt_regs
*regs
, struct user_fp
*fp
)
349 struct thread_info
*thread
= current_thread_info();
350 int used_math
= thread
->used_cp
[1] | thread
->used_cp
[2];
353 memcpy(fp
, &thread
->fpstate
.soft
, sizeof (*fp
));
355 return used_math
!= 0;
357 EXPORT_SYMBOL(dump_fpu
);
360 * fill in the user structure for a core dump..
362 void dump_thread(struct pt_regs
* regs
, struct user
* dump
)
364 struct task_struct
*tsk
= current
;
366 dump
->magic
= CMAGIC
;
367 dump
->start_code
= tsk
->mm
->start_code
;
368 dump
->start_stack
= regs
->ARM_sp
& ~(PAGE_SIZE
- 1);
370 dump
->u_tsize
= (tsk
->mm
->end_code
- tsk
->mm
->start_code
) >> PAGE_SHIFT
;
371 dump
->u_dsize
= (tsk
->mm
->brk
- tsk
->mm
->start_data
+ PAGE_SIZE
- 1) >> PAGE_SHIFT
;
374 dump
->u_debugreg
[0] = tsk
->thread
.debug
.bp
[0].address
;
375 dump
->u_debugreg
[1] = tsk
->thread
.debug
.bp
[1].address
;
376 dump
->u_debugreg
[2] = tsk
->thread
.debug
.bp
[0].insn
.arm
;
377 dump
->u_debugreg
[3] = tsk
->thread
.debug
.bp
[1].insn
.arm
;
378 dump
->u_debugreg
[4] = tsk
->thread
.debug
.nsaved
;
380 if (dump
->start_stack
< 0x04000000)
381 dump
->u_ssize
= (0x04000000 - dump
->start_stack
) >> PAGE_SHIFT
;
384 dump
->u_fpvalid
= dump_fpu (regs
, &dump
->u_fp
);
386 EXPORT_SYMBOL(dump_thread
);
389 * Shuffle the argument into the correct register before calling the
390 * thread function. r1 is the thread argument, r2 is the pointer to
391 * the thread function, and r3 points to the exit function.
393 extern void kernel_thread_helper(void);
394 asm( ".section .text\n"
396 " .type kernel_thread_helper, #function\n"
397 "kernel_thread_helper:\n"
401 " .size kernel_thread_helper, . - kernel_thread_helper\n"
405 * Create a kernel thread.
407 pid_t
kernel_thread(int (*fn
)(void *), void *arg
, unsigned long flags
)
411 memset(®s
, 0, sizeof(regs
));
413 regs
.ARM_r1
= (unsigned long)arg
;
414 regs
.ARM_r2
= (unsigned long)fn
;
415 regs
.ARM_r3
= (unsigned long)do_exit
;
416 regs
.ARM_pc
= (unsigned long)kernel_thread_helper
;
417 regs
.ARM_cpsr
= SVC_MODE
;
419 return do_fork(flags
|CLONE_VM
|CLONE_UNTRACED
, 0, ®s
, 0, NULL
, NULL
);
421 EXPORT_SYMBOL(kernel_thread
);
423 unsigned long get_wchan(struct task_struct
*p
)
425 unsigned long fp
, lr
;
426 unsigned long stack_start
, stack_end
;
428 if (!p
|| p
== current
|| p
->state
== TASK_RUNNING
)
431 stack_start
= (unsigned long)end_of_stack(p
);
432 stack_end
= (unsigned long)task_stack_page(p
) + THREAD_SIZE
;
434 fp
= thread_saved_fp(p
);
436 if (fp
< stack_start
|| fp
> stack_end
)
438 lr
= pc_pointer (((unsigned long *)fp
)[-1]);
439 if (!in_sched_functions(lr
))
441 fp
= *(unsigned long *) (fp
- 12);
442 } while (count
++ < 16);