| 1 | /*! @file efi_tables.c␊ |
| 2 | Copyright 2007 David F. Elliott. All rights reserved.␊ |
| 3 | */␊ |
| 4 | #include "libsa.h"␊ |
| 5 | #include "efi_tables.h"␊ |
| 6 | ␊ |
| 7 | ␊ |
| 8 | /*==========================================================================␊ |
| 9 | * CRC32 implementation copied from xnu in turn copied from Gary S. Brown.␊ |
| 10 | */␊ |
| 11 | ␊ |
| 12 | /*-␊ |
| 13 | * COPYRIGHT (C) 1986 Gary S. Brown. You may use this program, or␊ |
| 14 | * code or tables extracted from it, as desired without restriction.␊ |
| 15 | *␊ |
| 16 | * First, the polynomial itself and its table of feedback terms. The␊ |
| 17 | * polynomial is␊ |
| 18 | * X^32+X^26+X^23+X^22+X^16+X^12+X^11+X^10+X^8+X^7+X^5+X^4+X^2+X^1+X^0␊ |
| 19 | *␊ |
| 20 | * Note that we take it "backwards" and put the highest-order term in␊ |
| 21 | * the lowest-order bit. The X^32 term is "implied"; the LSB is the␊ |
| 22 | * X^31 term, etc. The X^0 term (usually shown as "+1") results in␊ |
| 23 | * the MSB being 1␊ |
| 24 | *␊ |
| 25 | * Note that the usual hardware shift register implementation, which␊ |
| 26 | * is what we're using (we're merely optimizing it by doing eight-bit␊ |
| 27 | * chunks at a time) shifts bits into the lowest-order term. In our␊ |
| 28 | * implementation, that means shifting towards the right. Why do we␊ |
| 29 | * do it this way? Because the calculated CRC must be transmitted in␊ |
| 30 | * order from highest-order term to lowest-order term. UARTs transmit␊ |
| 31 | * characters in order from LSB to MSB. By storing the CRC this way␊ |
| 32 | * we hand it to the UART in the order low-byte to high-byte; the UART␊ |
| 33 | * sends each low-bit to hight-bit; and the result is transmission bit␊ |
| 34 | * by bit from highest- to lowest-order term without requiring any bit␊ |
| 35 | * shuffling on our part. Reception works similarly␊ |
| 36 | *␊ |
| 37 | * The feedback terms table consists of 256, 32-bit entries. Notes␊ |
| 38 | *␊ |
| 39 | * The table can be generated at runtime if desired; code to do so␊ |
| 40 | * is shown later. It might not be obvious, but the feedback␊ |
| 41 | * terms simply represent the results of eight shift/xor opera␊ |
| 42 | * tions for all combinations of data and CRC register values␊ |
| 43 | *␊ |
| 44 | * The values must be right-shifted by eight bits by the "updcrc␊ |
| 45 | * logic; the shift must be unsigned (bring in zeroes). On some␊ |
| 46 | * hardware you could probably optimize the shift in assembler by␊ |
| 47 | * using byte-swap instructions␊ |
| 48 | * polynomial $edb88320␊ |
| 49 | *␊ |
| 50 | *␊ |
| 51 | * CRC32 code derived from work by Gary S. Brown.␊ |
| 52 | */␊ |
| 53 | ␊ |
| 54 | static uint32_t crc32_tab[] = {␊ |
| 55 | ␉0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,␊ |
| 56 | ␉0xe963a535, 0x9e6495a3,␉0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,␊ |
| 57 | ␉0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,␊ |
| 58 | ␉0xf3b97148, 0x84be41de,␉0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,␊ |
| 59 | ␉0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,␉0x14015c4f, 0x63066cd9,␊ |
| 60 | ␉0xfa0f3d63, 0x8d080df5,␉0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,␊ |
| 61 | ␉0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,␉0x35b5a8fa, 0x42b2986c,␊ |
| 62 | ␉0xdbbbc9d6, 0xacbcf940,␉0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,␊ |
| 63 | ␉0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,␊ |
| 64 | ␉0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,␊ |
| 65 | ␉0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,␉0x76dc4190, 0x01db7106,␊ |
| 66 | ␉0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,␊ |
| 67 | ␉0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,␊ |
| 68 | ␉0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,␊ |
| 69 | ␉0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,␊ |
| 70 | ␉0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,␊ |
| 71 | ␉0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,␊ |
| 72 | ␉0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,␊ |
| 73 | ␉0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,␊ |
| 74 | ␉0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,␊ |
| 75 | ␉0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,␊ |
| 76 | ␉0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,␊ |
| 77 | ␉0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,␊ |
| 78 | ␉0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,␊ |
| 79 | ␉0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,␊ |
| 80 | ␉0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,␊ |
| 81 | ␉0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,␊ |
| 82 | ␉0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,␊ |
| 83 | ␉0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,␊ |
| 84 | ␉0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,␊ |
| 85 | ␉0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,␊ |
| 86 | ␉0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,␊ |
| 87 | ␉0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,␊ |
| 88 | ␉0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,␊ |
| 89 | ␉0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,␊ |
| 90 | ␉0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,␊ |
| 91 | ␉0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,␊ |
| 92 | ␉0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,␊ |
| 93 | ␉0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,␊ |
| 94 | ␉0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,␊ |
| 95 | ␉0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,␊ |
| 96 | ␉0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,␊ |
| 97 | ␉0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d␊ |
| 98 | };␊ |
| 99 | ␊ |
| 100 | uint32_t␊ |
| 101 | crc32(uint32_t crc, const void *buf, size_t size)␊ |
| 102 | {␊ |
| 103 | ␉const uint8_t *p;␊ |
| 104 | ␊ |
| 105 | ␉p = buf;␊ |
| 106 | ␉crc = crc ^ ~0U;␊ |
| 107 | ␊ |
| 108 | ␉while (size--)␊ |
| 109 | ␉␉crc = crc32_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8);␊ |
| 110 | ␊ |
| 111 | ␉return crc ^ ~0U;␊ |
| 112 | }␊ |
| 113 | ␊ |
| 114 | ␊ |
| 115 | /*==========================================================================␊ |
| 116 | * Utility function to make a device tree string from an EFI_GUID␊ |
| 117 | */␊ |
| 118 | ␊ |
| 119 | void efi_guid_unparse_upper(EFI_GUID const *pGuid, char *out)␊ |
| 120 | {␊ |
| 121 | sprintf(out, "%08X-%04X-%04X-%02X%02X-%02X%02X%02X%02X%02X%02X",␊ |
| 122 | pGuid->Data1, /* - */␊ |
| 123 | pGuid->Data2, /* - */␊ |
| 124 | pGuid->Data3, /* - */␊ |
| 125 | pGuid->Data4[0], pGuid->Data4[1], /* - */␊ |
| 126 | pGuid->Data4[2], pGuid->Data4[3],␊ |
| 127 | pGuid->Data4[4], pGuid->Data4[5],␊ |
| 128 | pGuid->Data4[6], pGuid->Data4[7]);␊ |
| 129 | }␊ |
| 130 | ␊ |
| 131 | int efi_guid_is_null(EFI_GUID const *pGuid)␊ |
| 132 | {␊ |
| 133 | if(pGuid->Data1 == 0 && pGuid->Data2 == 0 && pGuid->Data3 == 0)␊ |
| 134 | {␊ |
| 135 | int i;␊ |
| 136 | for(i=0; i<8; ++i)␊ |
| 137 | {␊ |
| 138 | if(pGuid->Data4[i] != 0)␊ |
| 139 | return FALSE;␊ |
| 140 | }␊ |
| 141 | return TRUE;␊ |
| 142 | }␊ |
| 143 | return FALSE;␊ |
| 144 | }␊ |
| 145 | ␊ |
| 146 | #define COMPARE_MEMBER_AND_RETURN_IF_NE(a,b,mem) \␊ |
| 147 | if( ((a)->mem) < ((b)->mem) ) \␊ |
| 148 | return -1; \␊ |
| 149 | else if( ((a)->mem) > ((b)->mem) ) \␊ |
| 150 | return 1;␊ |
| 151 | ␊ |
| 152 | int efi_guid_compare(EFI_GUID const *pG1, EFI_GUID const *pG2)␊ |
| 153 | {␊ |
| 154 | COMPARE_MEMBER_AND_RETURN_IF_NE(pG1, pG2, Data1);␊ |
| 155 | COMPARE_MEMBER_AND_RETURN_IF_NE(pG1, pG2, Data2);␊ |
| 156 | COMPARE_MEMBER_AND_RETURN_IF_NE(pG1, pG2, Data3);␊ |
| 157 | int i;␊ |
| 158 | for(i=0; i<8; ++i)␊ |
| 159 | {␊ |
| 160 | COMPARE_MEMBER_AND_RETURN_IF_NE(pG1, pG2, Data4[i]);␊ |
| 161 | }␊ |
| 162 | return 0;␊ |
| 163 | }␊ |
| 164 | ␊ |
| 165 | |
