forked from luck/tmp_suning_uos_patched
ARM: move reboot code to arch/arm/kernel/reboot.c
Move shutdown and reboot related code to a separate file, out of process.c. This helps to avoid polluting process.c with non-process related code. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
parent
767bf7e7a1
commit
045ab94e10
|
|
@ -16,7 +16,7 @@ CFLAGS_REMOVE_return_address.o = -pg
|
|||
# Object file lists.
|
||||
|
||||
obj-y := elf.o entry-common.o irq.o opcodes.o \
|
||||
process.o ptrace.o return_address.o \
|
||||
process.o ptrace.o reboot.o return_address.o \
|
||||
setup.o signal.o sigreturn_codes.o \
|
||||
stacktrace.o sys_arm.o time.o traps.o
|
||||
|
||||
|
|
|
|||
|
|
@ -100,7 +100,6 @@ static u64 resume_stack[PAGE_SIZE/2/sizeof(u64)] __nosavedata;
|
|||
*/
|
||||
int swsusp_arch_resume(void)
|
||||
{
|
||||
extern void call_with_stack(void (*fn)(void *), void *arg, void *sp);
|
||||
call_with_stack(arch_restore_image, 0,
|
||||
resume_stack + ARRAY_SIZE(resume_stack));
|
||||
return 0;
|
||||
|
|
|
|||
|
|
@ -17,12 +17,9 @@
|
|||
#include <linux/stddef.h>
|
||||
#include <linux/unistd.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>
|
||||
|
|
@ -31,17 +28,14 @@
|
|||
#include <linux/random.h>
|
||||
#include <linux/hw_breakpoint.h>
|
||||
#include <linux/leds.h>
|
||||
#include <linux/reboot.h>
|
||||
|
||||
#include <asm/cacheflush.h>
|
||||
#include <asm/idmap.h>
|
||||
#include <asm/processor.h>
|
||||
#include <asm/thread_notify.h>
|
||||
#include <asm/stacktrace.h>
|
||||
#include <asm/system_misc.h>
|
||||
#include <asm/mach/time.h>
|
||||
#include <asm/tls.h>
|
||||
#include "reboot.h"
|
||||
#include <asm/vdso.h>
|
||||
|
||||
#ifdef CONFIG_CC_STACKPROTECTOR
|
||||
#include <linux/stackprotector.h>
|
||||
|
|
@ -60,74 +54,6 @@ static const char *isa_modes[] __maybe_unused = {
|
|||
"ARM" , "Thumb" , "Jazelle", "ThumbEE"
|
||||
};
|
||||
|
||||
extern void call_with_stack(void (*fn)(void *), void *arg, void *sp);
|
||||
typedef void (*phys_reset_t)(unsigned long);
|
||||
|
||||
/*
|
||||
* A temporary stack to use for CPU reset. This is static so that we
|
||||
* don't clobber it with the identity mapping. When running with this
|
||||
* stack, any references to the current task *will not work* so you
|
||||
* should really do as little as possible before jumping to your reset
|
||||
* code.
|
||||
*/
|
||||
static u64 soft_restart_stack[16];
|
||||
|
||||
static void __soft_restart(void *addr)
|
||||
{
|
||||
phys_reset_t phys_reset;
|
||||
|
||||
/* Take out a flat memory mapping. */
|
||||
setup_mm_for_reboot();
|
||||
|
||||
/* Clean and invalidate caches */
|
||||
flush_cache_all();
|
||||
|
||||
/* Turn off caching */
|
||||
cpu_proc_fin();
|
||||
|
||||
/* Push out any further dirty data, and ensure cache is empty */
|
||||
flush_cache_all();
|
||||
|
||||
/* Switch to the identity mapping. */
|
||||
phys_reset = (phys_reset_t)(unsigned long)virt_to_phys(cpu_reset);
|
||||
phys_reset((unsigned long)addr);
|
||||
|
||||
/* Should never get here. */
|
||||
BUG();
|
||||
}
|
||||
|
||||
void _soft_restart(unsigned long addr, bool disable_l2)
|
||||
{
|
||||
u64 *stack = soft_restart_stack + ARRAY_SIZE(soft_restart_stack);
|
||||
|
||||
/* Disable interrupts first */
|
||||
raw_local_irq_disable();
|
||||
local_fiq_disable();
|
||||
|
||||
/* Disable the L2 if we're the last man standing. */
|
||||
if (disable_l2)
|
||||
outer_disable();
|
||||
|
||||
/* Change to the new stack and continue with the reset. */
|
||||
call_with_stack(__soft_restart, (void *)addr, (void *)stack);
|
||||
|
||||
/* Should never get here. */
|
||||
BUG();
|
||||
}
|
||||
|
||||
void soft_restart(unsigned long addr)
|
||||
{
|
||||
_soft_restart(addr, num_online_cpus() == 1);
|
||||
}
|
||||
|
||||
/*
|
||||
* Function pointers to optional machine specific functions
|
||||
*/
|
||||
void (*pm_power_off)(void);
|
||||
EXPORT_SYMBOL(pm_power_off);
|
||||
|
||||
void (*arm_pm_restart)(enum reboot_mode reboot_mode, const char *cmd);
|
||||
|
||||
/*
|
||||
* This is our default idle handler.
|
||||
*/
|
||||
|
|
@ -172,79 +98,6 @@ void arch_cpu_idle_dead(void)
|
|||
}
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Called by kexec, immediately prior to machine_kexec().
|
||||
*
|
||||
* This must completely disable all secondary CPUs; simply causing those CPUs
|
||||
* to execute e.g. a RAM-based pin loop is not sufficient. This allows the
|
||||
* kexec'd kernel to use any and all RAM as it sees fit, without having to
|
||||
* avoid any code or data used by any SW CPU pin loop. The CPU hotplug
|
||||
* functionality embodied in disable_nonboot_cpus() to achieve this.
|
||||
*/
|
||||
void machine_shutdown(void)
|
||||
{
|
||||
disable_nonboot_cpus();
|
||||
}
|
||||
|
||||
/*
|
||||
* Halting simply requires that the secondary CPUs stop performing any
|
||||
* activity (executing tasks, handling interrupts). smp_send_stop()
|
||||
* achieves this.
|
||||
*/
|
||||
void machine_halt(void)
|
||||
{
|
||||
local_irq_disable();
|
||||
smp_send_stop();
|
||||
|
||||
local_irq_disable();
|
||||
while (1);
|
||||
}
|
||||
|
||||
/*
|
||||
* Power-off simply requires that the secondary CPUs stop performing any
|
||||
* activity (executing tasks, handling interrupts). smp_send_stop()
|
||||
* achieves this. When the system power is turned off, it will take all CPUs
|
||||
* with it.
|
||||
*/
|
||||
void machine_power_off(void)
|
||||
{
|
||||
local_irq_disable();
|
||||
smp_send_stop();
|
||||
|
||||
if (pm_power_off)
|
||||
pm_power_off();
|
||||
}
|
||||
|
||||
/*
|
||||
* Restart requires that the secondary CPUs stop performing any activity
|
||||
* while the primary CPU resets the system. Systems with a single CPU can
|
||||
* use soft_restart() as their machine descriptor's .restart hook, since that
|
||||
* will cause the only available CPU to reset. Systems with multiple CPUs must
|
||||
* provide a HW restart implementation, to ensure that all CPUs reset at once.
|
||||
* This is required so that any code running after reset on the primary CPU
|
||||
* doesn't have to co-ordinate with other CPUs to ensure they aren't still
|
||||
* executing pre-reset code, and using RAM that the primary CPU's code wishes
|
||||
* to use. Implementing such co-ordination would be essentially impossible.
|
||||
*/
|
||||
void machine_restart(char *cmd)
|
||||
{
|
||||
local_irq_disable();
|
||||
smp_send_stop();
|
||||
|
||||
if (arm_pm_restart)
|
||||
arm_pm_restart(reboot_mode, cmd);
|
||||
else
|
||||
do_kernel_restart(cmd);
|
||||
|
||||
/* Give a grace period for failure to restart of 1s */
|
||||
mdelay(1000);
|
||||
|
||||
/* Whoops - the platform was unable to reboot. Tell the user! */
|
||||
printk("Reboot failed -- System halted\n");
|
||||
local_irq_disable();
|
||||
while (1);
|
||||
}
|
||||
|
||||
void __show_regs(struct pt_regs *regs)
|
||||
{
|
||||
unsigned long flags;
|
||||
|
|
|
|||
155
arch/arm/kernel/reboot.c
Normal file
155
arch/arm/kernel/reboot.c
Normal file
|
|
@ -0,0 +1,155 @@
|
|||
/*
|
||||
* 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 <linux/cpu.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/reboot.h>
|
||||
|
||||
#include <asm/cacheflush.h>
|
||||
#include <asm/idmap.h>
|
||||
|
||||
#include "reboot.h"
|
||||
|
||||
typedef void (*phys_reset_t)(unsigned long);
|
||||
|
||||
/*
|
||||
* Function pointers to optional machine specific functions
|
||||
*/
|
||||
void (*arm_pm_restart)(enum reboot_mode reboot_mode, const char *cmd);
|
||||
void (*pm_power_off)(void);
|
||||
EXPORT_SYMBOL(pm_power_off);
|
||||
|
||||
/*
|
||||
* A temporary stack to use for CPU reset. This is static so that we
|
||||
* don't clobber it with the identity mapping. When running with this
|
||||
* stack, any references to the current task *will not work* so you
|
||||
* should really do as little as possible before jumping to your reset
|
||||
* code.
|
||||
*/
|
||||
static u64 soft_restart_stack[16];
|
||||
|
||||
static void __soft_restart(void *addr)
|
||||
{
|
||||
phys_reset_t phys_reset;
|
||||
|
||||
/* Take out a flat memory mapping. */
|
||||
setup_mm_for_reboot();
|
||||
|
||||
/* Clean and invalidate caches */
|
||||
flush_cache_all();
|
||||
|
||||
/* Turn off caching */
|
||||
cpu_proc_fin();
|
||||
|
||||
/* Push out any further dirty data, and ensure cache is empty */
|
||||
flush_cache_all();
|
||||
|
||||
/* Switch to the identity mapping. */
|
||||
phys_reset = (phys_reset_t)(unsigned long)virt_to_phys(cpu_reset);
|
||||
phys_reset((unsigned long)addr);
|
||||
|
||||
/* Should never get here. */
|
||||
BUG();
|
||||
}
|
||||
|
||||
void _soft_restart(unsigned long addr, bool disable_l2)
|
||||
{
|
||||
u64 *stack = soft_restart_stack + ARRAY_SIZE(soft_restart_stack);
|
||||
|
||||
/* Disable interrupts first */
|
||||
raw_local_irq_disable();
|
||||
local_fiq_disable();
|
||||
|
||||
/* Disable the L2 if we're the last man standing. */
|
||||
if (disable_l2)
|
||||
outer_disable();
|
||||
|
||||
/* Change to the new stack and continue with the reset. */
|
||||
call_with_stack(__soft_restart, (void *)addr, (void *)stack);
|
||||
|
||||
/* Should never get here. */
|
||||
BUG();
|
||||
}
|
||||
|
||||
void soft_restart(unsigned long addr)
|
||||
{
|
||||
_soft_restart(addr, num_online_cpus() == 1);
|
||||
}
|
||||
|
||||
/*
|
||||
* Called by kexec, immediately prior to machine_kexec().
|
||||
*
|
||||
* This must completely disable all secondary CPUs; simply causing those CPUs
|
||||
* to execute e.g. a RAM-based pin loop is not sufficient. This allows the
|
||||
* kexec'd kernel to use any and all RAM as it sees fit, without having to
|
||||
* avoid any code or data used by any SW CPU pin loop. The CPU hotplug
|
||||
* functionality embodied in disable_nonboot_cpus() to achieve this.
|
||||
*/
|
||||
void machine_shutdown(void)
|
||||
{
|
||||
disable_nonboot_cpus();
|
||||
}
|
||||
|
||||
/*
|
||||
* Halting simply requires that the secondary CPUs stop performing any
|
||||
* activity (executing tasks, handling interrupts). smp_send_stop()
|
||||
* achieves this.
|
||||
*/
|
||||
void machine_halt(void)
|
||||
{
|
||||
local_irq_disable();
|
||||
smp_send_stop();
|
||||
|
||||
local_irq_disable();
|
||||
while (1);
|
||||
}
|
||||
|
||||
/*
|
||||
* Power-off simply requires that the secondary CPUs stop performing any
|
||||
* activity (executing tasks, handling interrupts). smp_send_stop()
|
||||
* achieves this. When the system power is turned off, it will take all CPUs
|
||||
* with it.
|
||||
*/
|
||||
void machine_power_off(void)
|
||||
{
|
||||
local_irq_disable();
|
||||
smp_send_stop();
|
||||
|
||||
if (pm_power_off)
|
||||
pm_power_off();
|
||||
}
|
||||
|
||||
/*
|
||||
* Restart requires that the secondary CPUs stop performing any activity
|
||||
* while the primary CPU resets the system. Systems with a single CPU can
|
||||
* use soft_restart() as their machine descriptor's .restart hook, since that
|
||||
* will cause the only available CPU to reset. Systems with multiple CPUs must
|
||||
* provide a HW restart implementation, to ensure that all CPUs reset at once.
|
||||
* This is required so that any code running after reset on the primary CPU
|
||||
* doesn't have to co-ordinate with other CPUs to ensure they aren't still
|
||||
* executing pre-reset code, and using RAM that the primary CPU's code wishes
|
||||
* to use. Implementing such co-ordination would be essentially impossible.
|
||||
*/
|
||||
void machine_restart(char *cmd)
|
||||
{
|
||||
local_irq_disable();
|
||||
smp_send_stop();
|
||||
|
||||
if (arm_pm_restart)
|
||||
arm_pm_restart(reboot_mode, cmd);
|
||||
else
|
||||
do_kernel_restart(cmd);
|
||||
|
||||
/* Give a grace period for failure to restart of 1s */
|
||||
mdelay(1000);
|
||||
|
||||
/* Whoops - the platform was unable to reboot. Tell the user! */
|
||||
printk("Reboot failed -- System halted\n");
|
||||
local_irq_disable();
|
||||
while (1);
|
||||
}
|
||||
|
|
@ -1,6 +1,7 @@
|
|||
#ifndef REBOOT_H
|
||||
#define REBOOT_H
|
||||
|
||||
extern void call_with_stack(void (*fn)(void *), void *arg, void *sp);
|
||||
extern void _soft_restart(unsigned long addr, bool disable_l2);
|
||||
|
||||
#endif
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user