You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
425 lines
9.5 KiB
425 lines
9.5 KiB
/*
|
|
* linux/arch/arm/kernel/process.c
|
|
*
|
|
* Copyright (C) 1996-2000 Russell King - Converted to ARM.
|
|
* Original Copyright (C) 1995 Linus Torvalds
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#include <stdarg.h>
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/stddef.h>
|
|
#include <linux/unistd.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/user.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/reboot.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/kallsyms.h>
|
|
#include <linux/init.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/elfcore.h>
|
|
#include <linux/pm.h>
|
|
#include <linux/tick.h>
|
|
#include <linux/utsname.h>
|
|
|
|
#include <asm/leds.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/system.h>
|
|
#include <asm/thread_notify.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/mach/time.h>
|
|
|
|
static const char *processor_modes[] = {
|
|
"USER_26", "FIQ_26" , "IRQ_26" , "SVC_26" , "UK4_26" , "UK5_26" , "UK6_26" , "UK7_26" ,
|
|
"UK8_26" , "UK9_26" , "UK10_26", "UK11_26", "UK12_26", "UK13_26", "UK14_26", "UK15_26",
|
|
"USER_32", "FIQ_32" , "IRQ_32" , "SVC_32" , "UK4_32" , "UK5_32" , "UK6_32" , "ABT_32" ,
|
|
"UK8_32" , "UK9_32" , "UK10_32", "UND_32" , "UK12_32", "UK13_32", "UK14_32", "SYS_32"
|
|
};
|
|
|
|
static const char *isa_modes[] = {
|
|
"ARM" , "Thumb" , "Jazelle", "ThumbEE"
|
|
};
|
|
|
|
extern void setup_mm_for_reboot(char mode);
|
|
|
|
static volatile int hlt_counter;
|
|
|
|
#include <asm/arch/system.h>
|
|
|
|
void disable_hlt(void)
|
|
{
|
|
hlt_counter++;
|
|
}
|
|
|
|
EXPORT_SYMBOL(disable_hlt);
|
|
|
|
void enable_hlt(void)
|
|
{
|
|
hlt_counter--;
|
|
}
|
|
|
|
EXPORT_SYMBOL(enable_hlt);
|
|
|
|
static int __init nohlt_setup(char *__unused)
|
|
{
|
|
hlt_counter = 1;
|
|
return 1;
|
|
}
|
|
|
|
static int __init hlt_setup(char *__unused)
|
|
{
|
|
hlt_counter = 0;
|
|
return 1;
|
|
}
|
|
|
|
__setup("nohlt", nohlt_setup);
|
|
__setup("hlt", hlt_setup);
|
|
|
|
void arm_machine_restart(char mode)
|
|
{
|
|
/*
|
|
* Clean and disable cache, and turn off interrupts
|
|
*/
|
|
cpu_proc_fin();
|
|
|
|
/*
|
|
* Tell the mm system that we are going to reboot -
|
|
* we may need it to insert some 1:1 mappings so that
|
|
* soft boot works.
|
|
*/
|
|
setup_mm_for_reboot(mode);
|
|
|
|
/*
|
|
* Now call the architecture specific reboot code.
|
|
*/
|
|
arch_reset(mode);
|
|
|
|
/*
|
|
* Whoops - the architecture was unable to reboot.
|
|
* Tell the user!
|
|
*/
|
|
mdelay(1000);
|
|
printk("Reboot failed -- System halted\n");
|
|
while (1);
|
|
}
|
|
|
|
/*
|
|
* Function pointers to optional machine specific functions
|
|
*/
|
|
void (*pm_idle)(void);
|
|
EXPORT_SYMBOL(pm_idle);
|
|
|
|
void (*pm_power_off)(void);
|
|
EXPORT_SYMBOL(pm_power_off);
|
|
|
|
void (*arm_pm_restart)(char str) = arm_machine_restart;
|
|
EXPORT_SYMBOL_GPL(arm_pm_restart);
|
|
|
|
|
|
/*
|
|
* This is our default idle handler. We need to disable
|
|
* interrupts here to ensure we don't miss a wakeup call.
|
|
*/
|
|
static void default_idle(void)
|
|
{
|
|
if (hlt_counter)
|
|
cpu_relax();
|
|
else {
|
|
local_irq_disable();
|
|
if (!need_resched()) {
|
|
timer_dyn_reprogram();
|
|
arch_idle();
|
|
}
|
|
local_irq_enable();
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The idle thread. We try to conserve power, while trying to keep
|
|
* overall latency low. The architecture specific idle is passed
|
|
* a value to indicate the level of "idleness" of the system.
|
|
*/
|
|
void cpu_idle(void)
|
|
{
|
|
local_fiq_enable();
|
|
|
|
/* endless idle loop with no priority at all */
|
|
while (1) {
|
|
void (*idle)(void) = pm_idle;
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
if (cpu_is_offline(smp_processor_id())) {
|
|
leds_event(led_idle_start);
|
|
cpu_die();
|
|
}
|
|
#endif
|
|
|
|
if (!idle)
|
|
idle = default_idle;
|
|
leds_event(led_idle_start);
|
|
tick_nohz_stop_sched_tick();
|
|
while (!need_resched())
|
|
idle();
|
|
leds_event(led_idle_end);
|
|
tick_nohz_restart_sched_tick();
|
|
preempt_enable_no_resched();
|
|
schedule();
|
|
preempt_disable();
|
|
}
|
|
}
|
|
|
|
static char reboot_mode = 'h';
|
|
|
|
int __init reboot_setup(char *str)
|
|
{
|
|
reboot_mode = str[0];
|
|
return 1;
|
|
}
|
|
|
|
__setup("reboot=", reboot_setup);
|
|
|
|
void machine_halt(void)
|
|
{
|
|
}
|
|
|
|
|
|
void machine_power_off(void)
|
|
{
|
|
if (pm_power_off)
|
|
pm_power_off();
|
|
}
|
|
|
|
void machine_restart(char * __unused)
|
|
{
|
|
arm_pm_restart(reboot_mode);
|
|
}
|
|
|
|
void __show_regs(struct pt_regs *regs)
|
|
{
|
|
unsigned long flags;
|
|
char buf[64];
|
|
|
|
printk("CPU: %d %s (%s %.*s)\n",
|
|
smp_processor_id(), print_tainted(), init_utsname()->release,
|
|
(int)strcspn(init_utsname()->version, " "),
|
|
init_utsname()->version);
|
|
print_symbol("PC is at %s\n", instruction_pointer(regs));
|
|
print_symbol("LR is at %s\n", regs->ARM_lr);
|
|
printk("pc : [<%08lx>] lr : [<%08lx>] psr: %08lx\n"
|
|
"sp : %08lx ip : %08lx fp : %08lx\n",
|
|
regs->ARM_pc, regs->ARM_lr, regs->ARM_cpsr,
|
|
regs->ARM_sp, regs->ARM_ip, regs->ARM_fp);
|
|
printk("r10: %08lx r9 : %08lx r8 : %08lx\n",
|
|
regs->ARM_r10, regs->ARM_r9,
|
|
regs->ARM_r8);
|
|
printk("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n",
|
|
regs->ARM_r7, regs->ARM_r6,
|
|
regs->ARM_r5, regs->ARM_r4);
|
|
printk("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n",
|
|
regs->ARM_r3, regs->ARM_r2,
|
|
regs->ARM_r1, regs->ARM_r0);
|
|
|
|
flags = regs->ARM_cpsr;
|
|
buf[0] = flags & PSR_N_BIT ? 'N' : 'n';
|
|
buf[1] = flags & PSR_Z_BIT ? 'Z' : 'z';
|
|
buf[2] = flags & PSR_C_BIT ? 'C' : 'c';
|
|
buf[3] = flags & PSR_V_BIT ? 'V' : 'v';
|
|
buf[4] = '\0';
|
|
|
|
printk("Flags: %s IRQs o%s FIQs o%s Mode %s ISA %s Segment %s\n",
|
|
buf, interrupts_enabled(regs) ? "n" : "ff",
|
|
fast_interrupts_enabled(regs) ? "n" : "ff",
|
|
processor_modes[processor_mode(regs)],
|
|
isa_modes[isa_mode(regs)],
|
|
get_fs() == get_ds() ? "kernel" : "user");
|
|
#ifdef CONFIG_CPU_CP15
|
|
{
|
|
unsigned int ctrl;
|
|
|
|
buf[0] = '\0';
|
|
#ifdef CONFIG_CPU_CP15_MMU
|
|
{
|
|
unsigned int transbase, dac;
|
|
asm("mrc p15, 0, %0, c2, c0\n\t"
|
|
"mrc p15, 0, %1, c3, c0\n"
|
|
: "=r" (transbase), "=r" (dac));
|
|
snprintf(buf, sizeof(buf), " Table: %08x DAC: %08x",
|
|
transbase, dac);
|
|
}
|
|
#endif
|
|
asm("mrc p15, 0, %0, c1, c0\n" : "=r" (ctrl));
|
|
|
|
printk("Control: %08x%s\n", ctrl, buf);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
void show_regs(struct pt_regs * regs)
|
|
{
|
|
printk("\n");
|
|
printk("Pid: %d, comm: %20s\n", task_pid_nr(current), current->comm);
|
|
__show_regs(regs);
|
|
__backtrace();
|
|
}
|
|
|
|
void show_fpregs(struct user_fp *regs)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 8; i++) {
|
|
unsigned long *p;
|
|
char type;
|
|
|
|
p = (unsigned long *)(regs->fpregs + i);
|
|
|
|
switch (regs->ftype[i]) {
|
|
case 1: type = 'f'; break;
|
|
case 2: type = 'd'; break;
|
|
case 3: type = 'e'; break;
|
|
default: type = '?'; break;
|
|
}
|
|
if (regs->init_flag)
|
|
type = '?';
|
|
|
|
printk(" f%d(%c): %08lx %08lx %08lx%c",
|
|
i, type, p[0], p[1], p[2], i & 1 ? '\n' : ' ');
|
|
}
|
|
|
|
|
|
printk("FPSR: %08lx FPCR: %08lx\n",
|
|
(unsigned long)regs->fpsr,
|
|
(unsigned long)regs->fpcr);
|
|
}
|
|
|
|
/*
|
|
* Free current thread data structures etc..
|
|
*/
|
|
void exit_thread(void)
|
|
{
|
|
}
|
|
|
|
ATOMIC_NOTIFIER_HEAD(thread_notify_head);
|
|
|
|
EXPORT_SYMBOL_GPL(thread_notify_head);
|
|
|
|
void flush_thread(void)
|
|
{
|
|
struct thread_info *thread = current_thread_info();
|
|
struct task_struct *tsk = current;
|
|
|
|
memset(thread->used_cp, 0, sizeof(thread->used_cp));
|
|
memset(&tsk->thread.debug, 0, sizeof(struct debug_info));
|
|
memset(&thread->fpstate, 0, sizeof(union fp_state));
|
|
|
|
thread_notify(THREAD_NOTIFY_FLUSH, thread);
|
|
}
|
|
|
|
void release_thread(struct task_struct *dead_task)
|
|
{
|
|
struct thread_info *thread = task_thread_info(dead_task);
|
|
|
|
thread_notify(THREAD_NOTIFY_RELEASE, thread);
|
|
}
|
|
|
|
asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
|
|
|
|
int
|
|
copy_thread(int nr, unsigned long clone_flags, unsigned long stack_start,
|
|
unsigned long stk_sz, struct task_struct *p, struct pt_regs *regs)
|
|
{
|
|
struct thread_info *thread = task_thread_info(p);
|
|
struct pt_regs *childregs = task_pt_regs(p);
|
|
|
|
*childregs = *regs;
|
|
childregs->ARM_r0 = 0;
|
|
childregs->ARM_sp = stack_start;
|
|
|
|
memset(&thread->cpu_context, 0, sizeof(struct cpu_context_save));
|
|
thread->cpu_context.sp = (unsigned long)childregs;
|
|
thread->cpu_context.pc = (unsigned long)ret_from_fork;
|
|
|
|
if (clone_flags & CLONE_SETTLS)
|
|
thread->tp_value = regs->ARM_r3;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* fill in the fpe structure for a core dump...
|
|
*/
|
|
int dump_fpu (struct pt_regs *regs, struct user_fp *fp)
|
|
{
|
|
struct thread_info *thread = current_thread_info();
|
|
int used_math = thread->used_cp[1] | thread->used_cp[2];
|
|
|
|
if (used_math)
|
|
memcpy(fp, &thread->fpstate.soft, sizeof (*fp));
|
|
|
|
return used_math != 0;
|
|
}
|
|
EXPORT_SYMBOL(dump_fpu);
|
|
|
|
/*
|
|
* Shuffle the argument into the correct register before calling the
|
|
* thread function. r1 is the thread argument, r2 is the pointer to
|
|
* the thread function, and r3 points to the exit function.
|
|
*/
|
|
extern void kernel_thread_helper(void);
|
|
asm( ".section .text\n"
|
|
" .align\n"
|
|
" .type kernel_thread_helper, #function\n"
|
|
"kernel_thread_helper:\n"
|
|
" mov r0, r1\n"
|
|
" mov lr, r3\n"
|
|
" mov pc, r2\n"
|
|
" .size kernel_thread_helper, . - kernel_thread_helper\n"
|
|
" .previous");
|
|
|
|
/*
|
|
* Create a kernel thread.
|
|
*/
|
|
pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
|
|
{
|
|
struct pt_regs regs;
|
|
|
|
memset(®s, 0, sizeof(regs));
|
|
|
|
regs.ARM_r1 = (unsigned long)arg;
|
|
regs.ARM_r2 = (unsigned long)fn;
|
|
regs.ARM_r3 = (unsigned long)do_exit;
|
|
regs.ARM_pc = (unsigned long)kernel_thread_helper;
|
|
regs.ARM_cpsr = SVC_MODE;
|
|
|
|
return do_fork(flags|CLONE_VM|CLONE_UNTRACED, 0, ®s, 0, NULL, NULL);
|
|
}
|
|
EXPORT_SYMBOL(kernel_thread);
|
|
|
|
unsigned long get_wchan(struct task_struct *p)
|
|
{
|
|
unsigned long fp, lr;
|
|
unsigned long stack_start, stack_end;
|
|
int count = 0;
|
|
if (!p || p == current || p->state == TASK_RUNNING)
|
|
return 0;
|
|
|
|
stack_start = (unsigned long)end_of_stack(p);
|
|
stack_end = (unsigned long)task_stack_page(p) + THREAD_SIZE;
|
|
|
|
fp = thread_saved_fp(p);
|
|
do {
|
|
if (fp < stack_start || fp > stack_end)
|
|
return 0;
|
|
lr = pc_pointer (((unsigned long *)fp)[-1]);
|
|
if (!in_sched_functions(lr))
|
|
return lr;
|
|
fp = *(unsigned long *) (fp - 12);
|
|
} while (count ++ < 16);
|
|
return 0;
|
|
}
|
|
|