1/* $NetBSD: start.S,v 1.2 2000/10/12 05:34:29 onoe 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 .text 33 .align 2 34 .set noreorder 35 36 .globl _start 37_start: 38 b 1f 39 nop 40 .word 0x19900106 /* version? */ 41 .word 0 42 43 /* disklabel here */ 44 .space 0x1f0 45 461: bgez a3, 2f /* load address */ 47 lui v0, 0xa000 /* 0xa0000000 for non-APbus */ 48 ori v0, 0x1000 /* 0xa0001000 for APbus */ 492: la v1, _start /* relocate myself */ 50 la t1, _end 513: lw t0, 0(v0) 52 addu v1, 4 53 sw t0, -4(v1) 54 bne v1, t1, 3b 55 addu v0, 4 56 bgez a3, 4f 57 nop 58 lw t0, 16(sp) 59 sw t0, _sip 604: li sp, 0xa0001000 61 la v0, bootxx 62 j v0 63 nop 64