1/* $NetBSD: start.S,v 1.1 2005/12/29 15:20:09 tsutsui Exp $ */ 2 3/*- 4 * Copyright (c) 2004 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by UCHIYAMA Yasushi. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#include <mips/regdef.h> 33 34 .set noreorder 35 .set mips3 36 .align 2 37 .text 38/* 39 * Entry point. 40 */ 41 .globl start 42start: 43 nop 44 nop 45 nop 46 nop 47 la sp, _ftext 48 49 mfc0 t0, $12 50 lui t1, 0x0040 /* BEV : use IPL's exception vector. */ 51 and t0, t0, t1 52 mtc0 t0, $12 53 nop 54 la t0, main 55 move a1, v0 56 jr t0 57 move a2, v1 /* v1 = mainfo */ 581: b 1b 59 nop 60 /* NOTREACHED */ 61 62#if 0 /* ROM putc test */ 63 li a0, 50 /* x-pos */ 642: li a2, 90 /* 'Z' */ 65 lui v0, 0xbfc0 66 ori v0, 0xff60 67 li a1, 50 /* y-pos */ 68 jal v0 69 nop 70 b 2b 71 addiu a0, a0, 12 72 /* NOTREACHED */ 73#endif 74#if 0 /* Frame buffer (TLB kseg2 mapped by IPL) test */ 75 move a3, zero 76 xori a3, a3, 0x00 773: sll v0, a3, 0x18 78 sra a2, v0, 0x18 79 lui a0, 0xf000 80 move v1, zero 81 lui a1, 0x1 82 ori a1, a1, 0xffff 832: sb a2, 0(a0) 84 addiu v1, v1, 1 85 slt v0, a1, v1 86 addiu a0, a0, 1 87 beqz v0, 2b 88 nop 89 xori a3, a3, 0xff 90 j 3b 91 nop 92 /* NOTREACHED */ 93#endif 94 95/* 96 * void tlb_read(int index, void *) 97 */ 98 .global tlb_read 99 .ent tlb_read 100tlb_read: 101 mtc0 a0, $0 /* Index Register */ 102 nop; nop; nop; nop; 103 tlbr 104 nop; nop; nop; nop; 105 mfc0 t0, $5 /* PageMask */ 106 nop; nop; nop; nop; 107 mfc0 t1, $10 /* EntryHi */ 108 nop; nop; nop; nop; 109 mfc0 t2, $2 /* EntryLo0 */ 110 nop; nop; nop; nop; 111 mfc0 t3, $3 /* EntryLo1 */ 112 nop; nop; nop; nop; 113 sw t0, 0(a1) 114 sw t1, 4(a1) 115 sw t2, 8(a1) 116 sw t3, 12(a1) 117 jr ra 118 nop 119 .end tlb_read 120