pbr.S revision 1.1.2.2
1 1.1.2.2 yamt /* $NetBSD: pbr.S,v 1.1.2.2 2006/09/03 15:23:20 yamt Exp $ */ 2 1.1.2.2 yamt 3 1.1.2.2 yamt /*- 4 1.1.2.2 yamt * Copyright (c) 2005 NONAKA Kimihiro 5 1.1.2.2 yamt * All rights reserved. 6 1.1.2.2 yamt * 7 1.1.2.2 yamt * Redistribution and use in source and binary forms, with or without 8 1.1.2.2 yamt * modification, are permitted provided that the following conditions 9 1.1.2.2 yamt * are met: 10 1.1.2.2 yamt * 1. Redistributions of source code must retain the above copyright 11 1.1.2.2 yamt * notice, this list of conditions and the following disclaimer. 12 1.1.2.2 yamt * 2. Redistributions in binary form must reproduce the above copyright 13 1.1.2.2 yamt * notice, this list of conditions and the following disclaimer in the 14 1.1.2.2 yamt * documentation and/or other materials provided with the distribution. 15 1.1.2.2 yamt * 16 1.1.2.2 yamt * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17 1.1.2.2 yamt * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 1.1.2.2 yamt * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 1.1.2.2 yamt * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20 1.1.2.2 yamt * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 1.1.2.2 yamt * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 1.1.2.2 yamt * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 1.1.2.2 yamt * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 1.1.2.2 yamt * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 1.1.2.2 yamt * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 1.1.2.2 yamt * SUCH DAMAGE. 27 1.1.2.2 yamt */ 28 1.1.2.2 yamt 29 1.1.2.2 yamt #include <machine/asm.h> 30 1.1.2.2 yamt #include <sys/bootblock.h> 31 1.1.2.2 yamt 32 1.1.2.2 yamt #ifdef BOOT_FROM_FAT 33 1.1.2.2 yamt #define MBR_AFTERBPB 90 /* BPB size in FAT32 partition BR */ 34 1.1.2.2 yamt #else 35 1.1.2.2 yamt #define MBR_AFTERBPB 62 /* BPB size in floppy master BR */ 36 1.1.2.2 yamt #endif 37 1.1.2.2 yamt 38 1.1.2.2 yamt ENTRY(start) 39 1.1.2.2 yamt bra start0 40 1.1.2.2 yamt .byte 0x11 /* 0x4e11: cmp/pz r14... */ 41 1.1.2.2 yamt .ascii "NetBSD20" 42 1.1.2.2 yamt 43 1.1.2.2 yamt . = _C_LABEL(start) + MBR_BPB_OFFSET /* move to start of BPB */ 44 1.1.2.2 yamt 45 1.1.2.2 yamt . = _C_LABEL(start) + MBR_AFTERBPB /* skip BPB */ 46 1.1.2.2 yamt start0: 47 1.1.2.2 yamt mova mbr_end, r0 48 1.1.2.2 yamt mov.w mbr_size, r2 49 1.1.2.2 yamt sub r2, r0 50 1.1.2.2 yamt mov r0, r11 /* r11: own loaded address */ 51 1.1.2.2 yamt 52 1.1.2.2 yamt mov.w stack_offset, r1 53 1.1.2.2 yamt add r1, r0 54 1.1.2.2 yamt mov r0, r15 /* r15: stack pointer */ 55 1.1.2.2 yamt mov r0, r10 /* r10: load address */ 56 1.1.2.2 yamt 57 1.1.2.2 yamt /* enable/flush cache */ 58 1.1.2.2 yamt mov #0, r4 59 1.1.2.2 yamt mov #6, r0 60 1.1.2.2 yamt trapa #0x3f 61 1.1.2.2 yamt 62 1.1.2.2 yamt /* Read from start of disk */ 63 1.1.2.2 yamt mov #0x40, r4 /* LBA */ 64 1.1.2.2 yamt mov #0, r5 /* LBA #0 */ 65 1.1.2.2 yamt mov r10, r6 /* buffer address */ 66 1.1.2.2 yamt bsr read_sectors_lba 67 1.1.2.2 yamt mov #BOOTXX_SECTORS, r7 /* number of sectors */ 68 1.1.2.2 yamt 69 1.1.2.2 yamt mov.l @r11, r1 70 1.1.2.2 yamt mov.l @r10, r2 71 1.1.2.2 yamt cmp/eq r1, r2 72 1.1.2.2 yamt bt/s pbr_read_ok 73 1.1.2.2 yamt mov #0, r9 /* r9: sector # */ 74 1.1.2.2 yamt 75 1.1.2.2 yamt /* Search bootable partition */ 76 1.1.2.2 yamt mov.w part_offset, r12 77 1.1.2.2 yamt add r10, r12 /* r12: pointer to partition entry */ 78 1.1.2.2 yamt mov #MBR_PART_COUNT, r8 /* r8: partition loop counter */ 79 1.1.2.2 yamt loop_part: 80 1.1.2.2 yamt mov.b @(4, r12), r0 81 1.1.2.2 yamt #ifdef BOOT_FROM_FAT 82 1.1.2.2 yamt cmp/eq #MBR_PTYPE_FAT12, r0 83 1.1.2.2 yamt bt found 84 1.1.2.2 yamt cmp/eq #MBR_PTYPE_FAT16S, r0 85 1.1.2.2 yamt bt found 86 1.1.2.2 yamt cmp/eq #MBR_PTYPE_FAT16B, r0 87 1.1.2.2 yamt bt found 88 1.1.2.2 yamt cmp/eq #MBR_PTYPE_FAT32, r0 89 1.1.2.2 yamt bt found 90 1.1.2.2 yamt cmp/eq #MBR_PTYPE_FAT32L, r0 91 1.1.2.2 yamt bt found 92 1.1.2.2 yamt cmp/eq #MBR_PTYPE_FAT16L, r0 93 1.1.2.2 yamt bt found 94 1.1.2.2 yamt #else 95 1.1.2.2 yamt cmp/eq #MBR_PTYPE_NETBSD, r0 96 1.1.2.2 yamt #endif 97 1.1.2.2 yamt bf next_part 98 1.1.2.2 yamt 99 1.1.2.2 yamt found: 100 1.1.2.2 yamt /* found boot partition */ 101 1.1.2.2 yamt mov.w @(8, r12), r0 102 1.1.2.2 yamt mov r0, r1 103 1.1.2.2 yamt mov.w @(10, r12), r0 104 1.1.2.2 yamt extu.w r1, r1 105 1.1.2.2 yamt shll16 r0 106 1.1.2.2 yamt or r1, r0 107 1.1.2.2 yamt tst r0, r0 108 1.1.2.2 yamt bt next_part /* start LBA == 0 ? */ 109 1.1.2.2 yamt 110 1.1.2.2 yamt bra boot_lba 111 1.1.2.2 yamt mov r0, r9 112 1.1.2.2 yamt 113 1.1.2.2 yamt next_part: 114 1.1.2.2 yamt dt r8 115 1.1.2.2 yamt bf/s loop_part 116 1.1.2.2 yamt add #16, r12 117 1.1.2.2 yamt 118 1.1.2.2 yamt ptn_error: 119 1.1.2.2 yamt /* Not found NetBSD partition */ 120 1.1.2.2 yamt mova ERR_PTN, r0 121 1.1.2.2 yamt error: 122 1.1.2.2 yamt bsr message_crlf 123 1.1.2.2 yamt mov r0, r4 124 1.1.2.2 yamt 99: bra 99b 125 1.1.2.2 yamt nop 126 1.1.2.2 yamt 127 1.1.2.2 yamt read_error: 128 1.1.2.2 yamt bra error 129 1.1.2.2 yamt mova ERR_READ, r0 130 1.1.2.2 yamt 131 1.1.2.2 yamt magic_error: 132 1.1.2.2 yamt bra error 133 1.1.2.2 yamt mova ERR_NO_BOOTXX, r0 134 1.1.2.2 yamt 135 1.1.2.2 yamt message_crlf: 136 1.1.2.2 yamt mov #32, r0 137 1.1.2.2 yamt trapa #0x3f 138 1.1.2.2 yamt mova crlf, r0 139 1.1.2.2 yamt mov r0, r4 140 1.1.2.2 yamt mov #32, r0 141 1.1.2.2 yamt trapa #0x3f 142 1.1.2.2 yamt rts 143 1.1.2.2 yamt nop 144 1.1.2.2 yamt 145 1.1.2.2 yamt read_sectors_lba: 146 1.1.2.2 yamt mov #2, r0 147 1.1.2.2 yamt trapa #0x3f 148 1.1.2.2 yamt tst r0, r0 149 1.1.2.2 yamt bf read_error 150 1.1.2.2 yamt rts 151 1.1.2.2 yamt nop 152 1.1.2.2 yamt 153 1.1.2.2 yamt boot_lba: 154 1.1.2.2 yamt mov #0x40, r4 /* LBA */ 155 1.1.2.2 yamt mov r9, r5 /* LBA # */ 156 1.1.2.2 yamt mov r10, r6 /* buffer address */ 157 1.1.2.2 yamt bsr read_sectors_lba 158 1.1.2.2 yamt mov #BOOTXX_SECTORS, r7 /* number of sectors */ 159 1.1.2.2 yamt 160 1.1.2.2 yamt pbr_read_ok: 161 1.1.2.2 yamt mov.l .L.bootxx_magic1, r1 162 1.1.2.2 yamt mov.l .L.bootxx_magic, r2 163 1.1.2.2 yamt mov.l @r2, r2 164 1.1.2.2 yamt cmp/eq r1, r2 165 1.1.2.2 yamt bf magic_error 166 1.1.2.2 yamt 167 1.1.2.2 yamt /* flush cache */ 168 1.1.2.2 yamt mov #0, r4 169 1.1.2.2 yamt mov #6, r0 170 1.1.2.2 yamt trapa #0x3f 171 1.1.2.2 yamt 172 1.1.2.2 yamt mov.l .L.bootxx_start, r13 173 1.1.2.2 yamt jmp @r13 /* jump to bootxx */ 174 1.1.2.2 yamt mov r9, r4 /* pass sector address to bootxx */ 175 1.1.2.2 yamt 176 1.1.2.2 yamt 177 1.1.2.2 yamt .align 1 178 1.1.2.2 yamt mbr_size: .word mbr_end - _C_LABEL(start) 179 1.1.2.2 yamt .align 1 180 1.1.2.2 yamt stack_offset: .word 0x1000 181 1.1.2.2 yamt .align 1 182 1.1.2.2 yamt part_offset: .word MBR_PART_OFFSET 183 1.1.2.2 yamt .align 1 184 1.1.2.2 yamt magic_offset: .word MBR_MAGIC_OFFSET 185 1.1.2.2 yamt 186 1.1.2.2 yamt .align 2 187 1.1.2.2 yamt .L.bootxx_magic1: 188 1.1.2.2 yamt .long LANDISK_BOOT_MAGIC_1 189 1.1.2.2 yamt .L.bootxx_magic: 190 1.1.2.2 yamt .long _C_LABEL(bootxx_magic) 191 1.1.2.2 yamt .L.bootxx_start: 192 1.1.2.2 yamt .long _C_LABEL(bootxx_start) 193 1.1.2.2 yamt 194 1.1.2.2 yamt .align 2 195 1.1.2.2 yamt crlf: .asciz "\r\n" 196 1.1.2.2 yamt 197 1.1.2.2 yamt .align 2 198 1.1.2.2 yamt ERR_READ: .asciz "Disk read" 199 1.1.2.2 yamt .align 2 200 1.1.2.2 yamt ERR_NO_BOOTXX: .asciz "Not a bootxx image" 201 1.1.2.2 yamt .align 2 202 1.1.2.2 yamt ERR_PTN: .asciz "No NetBSD partition" 203 1.1.2.2 yamt 204 1.1.2.2 yamt 205 1.1.2.2 yamt /* space for mbr_dsn */ 206 1.1.2.2 yamt . = _C_LABEL(start) + MBR_DSN_OFFSET 207 1.1.2.2 yamt .long 0 208 1.1.2.2 yamt 209 1.1.2.2 yamt /* mbr_bootsel_magic */ 210 1.1.2.2 yamt . = _C_LABEL(start) + MBR_BS_MAGIC_OFFSET 211 1.1.2.2 yamt .word 0 212 1.1.2.2 yamt 213 1.1.2.2 yamt /* 214 1.1.2.2 yamt * MBR partition table 215 1.1.2.2 yamt */ 216 1.1.2.2 yamt . = _C_LABEL(start) + MBR_PART_OFFSET 217 1.1.2.2 yamt _pbr_part0: 218 1.1.2.2 yamt .byte 0, 0, 0, 0, 0, 0, 0, 0 219 1.1.2.2 yamt .byte 0, 0, 0, 0, 0, 0, 0, 0 220 1.1.2.2 yamt _pbr_part1: 221 1.1.2.2 yamt .byte 0, 0, 0, 0, 0, 0, 0, 0 222 1.1.2.2 yamt .byte 0, 0, 0, 0, 0, 0, 0, 0 223 1.1.2.2 yamt _pbr_part2: 224 1.1.2.2 yamt .byte 0, 0, 0, 0, 0, 0, 0, 0 225 1.1.2.2 yamt .byte 0, 0, 0, 0, 0, 0, 0, 0 226 1.1.2.2 yamt _pbr_part3: 227 1.1.2.2 yamt .byte 0, 0, 0, 0, 0, 0, 0, 0 228 1.1.2.2 yamt .byte 0, 0, 0, 0, 0, 0, 0, 0 229 1.1.2.2 yamt 230 1.1.2.2 yamt . = _C_LABEL(start) + MBR_MAGIC_OFFSET 231 1.1.2.2 yamt magic: 232 1.1.2.2 yamt .word MBR_MAGIC 233 1.1.2.2 yamt mbr_end: 234
Indexes created Sun Oct 26 21:10:03 GMT 2025