system.h

基于组件方式开发操作系统的OSKIT源代码

/*
 * linux/include/asm-arm/arch-ebsa285/system.h
 *
 * Copyright (c) 1996,1997,1998 Russell King.
 */
#ifndef OSKIT

#include <asm/dec21285.h>
#include <asm/io.h>
#include <asm/hardware.h>
#include <asm/leds.h>

extern __inline__ void arch_reset(char mode)
{
	cli();

	if (mode == 's') {
		__asm__ volatile (
		"mov	lr, #0x41000000		@ prepare to jump to ROM
		 mov	r0, #0x130
		 mcr	p15, 0, r0, c1, c0	@ MMU off
		 mcr	p15, 0, ip, c7, c7	@ flush caches
		 mov	pc, lr" : : : "cc");
	} else {
		if (machine_is_ebsa285() || machine_is_co285()) {
			/* To reboot, we set up the 21285 watchdog and
			 * enable it.  We then wait for it to timeout.
			 */
			*CSR_TIMER4_LOAD = 0x8000;
			*CSR_TIMER4_CNTL = TIMER_CNTL_ENABLE |
					   TIMER_CNTL_AUTORELOAD |
					   TIMER_CNTL_DIV16;
			*CSR_SA110_CNTL |= 1 << 13;
		} else if (machine_is_netwinder()) {
			/* open up the SuperIO chip
			 */
			outb(0x87, 0x370);
			outb(0x87, 0x370);

			/* aux function group 1 (logical device 7)
			 */
			outb(0x07, 0x370);
			outb(0x07, 0x371);

			/* set GP16 for WD-TIMER output
			 */
			outb(0xe6, 0x370);
			outb(0x00, 0x371);

			/* set a RED LED and toggle WD_TIMER for rebooting
			 */
			outb(0xc4, 0x338);
		}
	}
}

#define arch_start_idle()	leds_event(led_idle_start)
#define arch_end_idle()		leds_event(led_idle_end)

#endif /* OSKIT */