| Wolfgang Denk | ac7eb8a | 2005-09-14 23:53:32 +0200 | [diff] [blame^] | 1 | /** |
| 2 | * (C) Copyright 2005 |
| 3 | * 2N Telekomunikace, Ladislav Michl <michl@2n.cz> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License |
| 7 | * version 2. |
| 8 | * |
| 9 | * Image layout looks like following: |
| 10 | * u32 - size |
| 11 | * u32 - version |
| 12 | * ... - data |
| 13 | * u32 - crc32 |
| 14 | */ |
| 15 | |
| 16 | #include "crcek.h" |
| 17 | |
| 18 | /** |
| 19 | * do_crc32 - calculate CRC32 of given buffer |
| 20 | * r0 - crc |
| 21 | * r1 - pointer to buffer |
| 22 | * r2 - buffer len |
| 23 | */ |
| 24 | .macro do_crc32 |
| 25 | ldr r5, FFFFFFFF |
| 26 | eor r0, r0, r5 |
| 27 | adr r3, CRC32_TABLE |
| 28 | 1: |
| 29 | ldrb r4, [r1], #1 |
| 30 | eor r4, r4, r0 |
| 31 | and r4, r4, #0xff |
| 32 | ldr r4, [r3, r4, lsl#2] |
| 33 | eor r0, r4, r0, lsr#8 |
| 34 | subs r2, r2, #0x1 |
| 35 | bne 1b |
| 36 | eor r0, r0, r5 |
| 37 | .endm |
| 38 | |
| 39 | .macro crcuj, offset, size |
| 40 | mov r0, #0 |
| 41 | ldr r1, \offset |
| 42 | ldr r2, [r1] |
| 43 | cmp r2, r0 @ no data, no problem |
| 44 | beq 2f |
| 45 | tst r2, #3 @ unaligned size |
| 46 | bne 2f |
| 47 | ldr r3, \size |
| 48 | cmp r2, r3 @ bogus size |
| 49 | bhi 2f |
| 50 | add r1, r1, #4 |
| 51 | do_crc32 |
| 52 | ldr r1, [r1] |
| 53 | 2: |
| 54 | cmp r0, r1 |
| 55 | .endm |
| 56 | |
| 57 | .macro wait, reg |
| 58 | mov \reg, #0x1000 |
| 59 | 3: |
| 60 | subs \reg, \reg, #0x1 |
| 61 | bne 3b |
| 62 | |
| 63 | .endm |
| 64 | .text |
| 65 | .globl crcek |
| 66 | crcek: |
| 67 | b crc2_bad |
| 68 | mov r6, #0 |
| 69 | crcuj _LOADER1_OFFSET, _LOADER_SIZE |
| 70 | bne crc1_bad |
| 71 | orr r6, r6, #1 |
| 72 | crc1_bad: |
| 73 | crcuj _LOADER2_OFFSET, _LOADER_SIZE |
| 74 | bne crc2_bad |
| 75 | orr r6, r6, #2 |
| 76 | crc2_bad: |
| 77 | ldr r3, _LOADER1_OFFSET |
| 78 | ldr r4, _LOADER2_OFFSET |
| 79 | b boot_2nd |
| 80 | tst r6, #3 |
| 81 | beq one_is_bad @ one of them (or both) has bad crc |
| 82 | ldr r1, [r3, #4] |
| 83 | ldr r2, [r4, #4] |
| 84 | cmp r1, r2 @ boot 2nd loader if versions differ |
| 85 | beq boot_1st |
| 86 | b boot_2nd |
| 87 | one_is_bad: |
| 88 | tst r6, #1 |
| 89 | bne boot_1st |
| 90 | tst r6, #2 |
| 91 | bne boot_2nd |
| 92 | @ We are doomed, so let user know. |
| 93 | ldr r0, GPIO_BASE @ configure GPIO pins |
| 94 | ldr r1, GPIO_DIRECTION |
| 95 | strh r1, [r0, #0x08] |
| 96 | blink_loop: |
| 97 | mov r1, #0x08 |
| 98 | strh r1, [r0, #0x04] |
| 99 | wait r3 |
| 100 | mov r1, #0x10 |
| 101 | strh r1, [r0, #0x04] |
| 102 | wait r3 |
| 103 | b blink_loop |
| 104 | boot_1st: |
| 105 | add pc, r3, #8 |
| 106 | boot_2nd: |
| 107 | add pc, r4, #8 |
| 108 | |
| 109 | _LOADER_SIZE: |
| 110 | .word LOADER_SIZE - 8 @ minus size and crc32 |
| 111 | _LOADER1_OFFSET: |
| 112 | .word LOADER1_OFFSET |
| 113 | _LOADER2_OFFSET: |
| 114 | .word LOADER2_OFFSET |
| 115 | |
| 116 | FFFFFFFF: |
| 117 | .word 0xffffffff |
| 118 | CRC32_TABLE: |
| 119 | .word 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419 |
| 120 | .word 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4 |
| 121 | .word 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07 |
| 122 | .word 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de |
| 123 | .word 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856 |
| 124 | .word 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9 |
| 125 | .word 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4 |
| 126 | .word 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b |
| 127 | .word 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3 |
| 128 | .word 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a |
| 129 | .word 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599 |
| 130 | .word 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924 |
| 131 | .word 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190 |
| 132 | .word 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f |
| 133 | .word 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e |
| 134 | .word 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01 |
| 135 | .word 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed |
| 136 | .word 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950 |
| 137 | .word 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3 |
| 138 | .word 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2 |
| 139 | .word 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a |
| 140 | .word 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5 |
| 141 | .word 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010 |
| 142 | .word 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f |
| 143 | .word 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17 |
| 144 | .word 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6 |
| 145 | .word 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615 |
| 146 | .word 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8 |
| 147 | .word 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344 |
| 148 | .word 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb |
| 149 | .word 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a |
| 150 | .word 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5 |
| 151 | .word 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1 |
| 152 | .word 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c |
| 153 | .word 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef |
| 154 | .word 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236 |
| 155 | .word 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe |
| 156 | .word 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31 |
| 157 | .word 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c |
| 158 | .word 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713 |
| 159 | .word 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b |
| 160 | .word 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242 |
| 161 | .word 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1 |
| 162 | .word 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c |
| 163 | .word 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278 |
| 164 | .word 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7 |
| 165 | .word 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66 |
| 166 | .word 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9 |
| 167 | .word 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605 |
| 168 | .word 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8 |
| 169 | .word 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b |
| 170 | .word 0x2d02ef8d |
| 171 | |
| 172 | GPIO_BASE: |
| 173 | .word 0xfffce000 |
| 174 | GPIO_DIRECTION: |
| 175 | .word 0x0000ffe7 |
| 176 | |
| 177 | .end |