boot.S revision 1.1
1 /* $NetBSD: boot.S,v 1.1 2006/09/01 21:26:18 uwe Exp $ */ 2 3 /*- 4 * Copyright (c) 2005 NONAKA Kimihiro 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <machine/asm.h> 30 #include <sys/bootblock.h> 31 32 ENTRY(boot_start) 33 bra boot_start1 34 nop 35 .balign 4 36 ENTRY(boot_magic) 37 .long LANDISK_BOOT_MAGIC_2 38 ENTRY(boot_params) 39 .long boot_start1 - boot_params 40 #include <boot_params.S> 41 42 . = boot_start + 0x80 43 boot_start1: 44 mov r4, r0 45 add #-4, r0 46 mov.l @(0, r0), r0 47 mov.l .L.boot_magic1, r1 48 cmp/eq r0, r1 49 bf 2f 50 mov r4, r0 51 mov.l .L.boot_params_size, r3 52 mov.l @r0, r2 53 mov.l .L.boot_params, r1 54 cmp/hi r3, r2 55 bf 1f 56 mov r3, r2 57 1: mov.b @r0+, r3 58 mov.b r3, @r1 59 dt r2 60 bf/s 1b 61 add #1, r1 62 2: 63 mov.l .L._end, r0 /* zero bss */ 64 mov.l .L.__bss_start, r1 65 sub r1, r0 66 shlr2 r0 /* _end and __bss_start are aligned */ 67 mov #0, r2 68 1: mov.l r2, @r1 69 dt r0 70 bf/s 1b 71 add #4, r1 72 73 mov.l .L.boot2, r0 74 jsr @r0 75 mov r5, r4 76 77 boot_fail: 78 mov r0, r1 79 mova .L.errtxt, r0 80 mov r0, r4 81 mov #32, r0 82 trapa #0x3f 83 mov r1, r4 84 mov #32, r0 85 trapa #0x3f 86 mova .L.crlf, r0 87 mov r0, r4 88 mov #32, r0 89 trapa #0x3f 90 99: bra 99b 91 nop 92 93 94 ENTRY(halt) 95 mova .L.pwrctl, r0 96 mov #1, r1 97 mov.b @r1, r0 98 rts 99 nop 100 101 ENTRY(reboot) 102 ENTRY(_rtt) 103 mov #1, r4 /* reboot */ 104 mov #11, r0 105 trapa #0x3f 106 mov.l .L.start, r0 107 jmp @r0 108 nop 109 110 111 .align 2 112 .L.boot_magic1: 113 .long LANDISK_BOOT_MAGIC_1 114 .L.boot_params: 115 .long boot_params 116 .L.boot_params_size: 117 .long boot_start1 - boot_params 118 .L._end: 119 .long _end 120 .L.__bss_start: 121 .long __bss_start 122 .L.boot2: 123 .long _C_LABEL(boot2) 124 .L.start: 125 .long 0xc0000000 126 .L.pwrctl: 127 .long 0xb0000003 128 129 .align 2 130 .L.errtxt: .asciz "Boot2 failed: " 131 .align 2 132 .L.crlf: .asciz "\r\n" 133
Indexes created Thu Oct 02 01:09:59 GMT 2025