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locore.S revision 1.1.2.1 
      1 /*	$NetBSD: locore.S,v 1.1.2.1 2000/11/20 20:17:33 bouyer Exp $	*/
      2 
      3 /*-
      4  * Copyright (C) 1999 Tsubai Masanari.  All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. The name of the author may not be used to endorse or promote products
     15  *    derived from this software without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include <mips/asm.h>
     30 #include <mips/cpuregs.h>
     31 
     32 	.set	noreorder
     33 	.text
     34 	.align	2
     35 
     36 	.globl	_start
     37 _start:
     38 	bal	1f
     39 	nop
     40 1:
     41 	la	t0, 1b
     42 	beq	t0, ra, skip
     43 	nop
     44 
     45 	/* relocate myself */
     46 	subu	t0, ra, (1b - _start)	# load address
     47 	la	t1, _start
     48 	la	t2, _edata
     49 2:
     50 	lw	t3, 0(t0)
     51 	nop
     52 	sw	t3, 0(t1)
     53 	addu	t0, t0, 4
     54 	addu	t1, t1, 4
     55 	bne	t1, t2, 2b
     56 	nop
     57 
     58 skip:
     59 	j	boot
     60 	nop
     61 
     62 /*
     63  * void mips1_flushicache(addr, len)
     64  */
     65 	.globl	mips1_flushicache
     66 
     67 mips1_flushicache:
     68 	mfc0	v0, MIPS_COP_0_STATUS		# save SR
     69 	mtc0	zero, MIPS_COP_0_STATUS		# disable interrupts
     70 
     71 	la	v1, 1f
     72 	or	v1, MIPS_KSEG1_START		# run uncached
     73 	j	v1
     74 	nop
     75 1:
     76 	li	v1, MIPS_SR_ISOL_CACHES | MIPS_SR_SWAP_CACHES
     77 	mtc0	v1, MIPS_COP_0_STATUS
     78 	nop
     79 	addu	a1, a1, a0			# compute ending address
     80 2:
     81 	sb	zero, -4(a0)
     82 	bne	a0, a1, 2b
     83 	addu	a0, a0, 4
     84 
     85 	mtc0	v0, MIPS_COP_0_STATUS		# enable interrupts
     86 	j	ra				# return and run cached
     87 	nop
     88