arch/sh/kernel/reboot.c

Source file repositories/reference/linux-study-clean/arch/sh/kernel/reboot.c

File Facts

System
Linux kernel
Corpus path
arch/sh/kernel/reboot.c
Extension
.c
Size
1724 bytes
Lines
97
Domain
Architecture Layer
Bucket
arch/sh
Inferred role
Architecture Layer: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
#include <linux/pm.h>
#include <linux/kexec.h>
#include <linux/kernel.h>
#include <linux/reboot.h>
#include <linux/module.h>
#include <asm/watchdog.h>
#include <asm/addrspace.h>
#include <asm/reboot.h>
#include <asm/tlbflush.h>
#include <asm/traps.h>

void (*pm_power_off)(void);
EXPORT_SYMBOL(pm_power_off);

static void watchdog_trigger_immediate(void)
{
	sh_wdt_write_cnt(0xFF);
	sh_wdt_write_csr(0xC2);
}

static void native_machine_restart(char * __unused)
{
	local_irq_disable();

	/* Destroy all of the TLBs in preparation for reset by MMU */
	__flush_tlb_global();

	/* Address error with SR.BL=1 first. */
	trigger_address_error();

	/* If that fails or is unsupported, go for the watchdog next. */
	watchdog_trigger_immediate();

	/*
	 * Give up and sleep.
	 */
	while (1)
		cpu_sleep();
}

static void native_machine_shutdown(void)
{
	smp_send_stop();
}

static void native_machine_power_off(void)
{
	do_kernel_power_off();
}

static void native_machine_halt(void)
{
	/* stop other cpus */
	machine_shutdown();

	/* stop this cpu */
	stop_this_cpu(NULL);
}

struct machine_ops machine_ops = {
	.power_off	= native_machine_power_off,
	.shutdown	= native_machine_shutdown,
	.restart	= native_machine_restart,
	.halt		= native_machine_halt,
#ifdef CONFIG_KEXEC_CORE
	.crash_shutdown = native_machine_crash_shutdown,
#endif
};

void machine_power_off(void)
{
	machine_ops.power_off();
}

void machine_shutdown(void)
{
	machine_ops.shutdown();
}

void machine_restart(char *cmd)
{
	machine_ops.restart(cmd);
}

void machine_halt(void)
{
	machine_ops.halt();
}

Annotation

Implementation Notes