reset.c

来自「Linux内核源代码 为压缩文件 是<<Linux内核>&gt」· C语言 代码 · 共 52 行

/*
 *  linux/arch/mips/sni/process.c
 *
 *  Reset a SNI machine.
 */
#include <asm/io.h>
#include <asm/reboot.h>
#include <asm/system.h>
#include <asm/sni.h>

/*
 * This routine reboots the machine by asking the keyboard
 * controller to pulse the reset-line low. We try that for a while,
 * and if it doesn't work, we do some other stupid things.
 */
static inline void
kb_wait(void)
{
	int i;

	for (i=0; i<0x10000; i++)
		if ((inb_p(0x64) & 0x02) == 0)
			break;
}

/* XXX This ends up at the ARC firmware prompt ...  */
void sni_machine_restart(char *command)
{
	int i, j;

	/* This does a normal via the keyboard controller like a PC.
	   We can do that easier ...  */
	sti();
	for (;;) {
		for (i=0; i<100; i++) {
			kb_wait();
			for(j = 0; j < 100000 ; j++)
				/* nothing */;
			outb_p(0xfe,0x64);	 /* pulse reset low */
		}
	}
}

void sni_machine_halt(void)
{
}

void sni_machine_power_off(void)
{
	*(volatile unsigned char *)PCIMT_CSWCSM = 0xfd;
}