a4300.s

mips架构的bootloader,99左右的版本 但源代码现在没人更新了

/*************************************************************
 * File: lib/a4300.s
 * Purpose: Part of C runtime library
 * Author: Phil Bunce ([e-mail])
 * Revision History:
 *	980305	Created from a4011.s
 */

#ifndef VR4300
#define VR4300
#endif
#include <mips.h>

#define C0_CONFIG       $16
#define CONFIG_ECMASK   (7<<28)
#define CONFIG_EC_13    (1<<28)
#define CONFIG_EPMASK   (15<<24)
#define CONFIG_EP_DD    (6<<24)
#define CONFIG_BE       (1<<15)
#define CONFIG_K0_3     (3<<0)


	.globl a4300init
	.ent a4300init
a4300init:
	beq     a0,zero,1f
	j       c4300init
    1:

       .set noreorder
       li      t0, (CONFIG_EC_13|CONFIG_BE|CONFIG_K0_3)
       mtc0    t0,C0_CONFIG
       nop
       .set reorder
	
	# select the correct cache flushing routines
	la	s0,r4300_flush

	j	ra
	.end a4300init