cpu.c

来自「最新版的u-boot,2008-10-18发布」· C语言 代码 · 共 76 行

/*
 * (C) Copyright 2003
 * Wolfgang Denk, DENX Software Engineering, <[e-mail]>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <command.h>
#include <asm/mipsregs.h>
#include <asm/cacheops.h>
#include <asm/reboot.h>

#define cache_op(op,addr)						\
	__asm__ __volatile__(						\
	"	.set	push					\n"	\
	"	.set	noreorder				\n"	\
	"	.set	mips3\n\t				\n"	\
	"	cache	%0, %1					\n"	\
	"	.set	pop					\n"	\
	:								\
	: "i" (op), "R" (*(unsigned char *)(addr)))

void __attribute__((weak)) _machine_restart(void)
{
}

int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
	_machine_restart();

	fprintf(stderr, "*** reset failed ***\n");
	return 0;
}

void flush_cache(ulong start_addr, ulong size)
{
	unsigned long lsize = CFG_CACHELINE_SIZE;
	unsigned long addr = start_addr & ~(lsize - 1);
	unsigned long aend = (start_addr + size - 1) & ~(lsize - 1);

	while (1) {
		cache_op(Hit_Writeback_Inv_D, addr);
		cache_op(Hit_Invalidate_I, addr);
		if (addr == aend)
			break;
		addr += lsize;
	}
}

void write_one_tlb(int index, u32 pagemask, u32 hi, u32 low0, u32 low1)
{
	write_c0_entrylo0(low0);
	write_c0_pagemask(pagemask);
	write_c0_entrylo1(low1);
	write_c0_entryhi(hi);
	write_c0_index(index);
	tlb_write_indexed();
}