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| 1 // Copyright (c) 2010 The Chromium OS Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "cgpt.h" |
| 6 |
| 7 #include <errno.h> |
| 8 #include <fcntl.h> |
| 9 #include <getopt.h> |
| 10 #include <stdio.h> |
| 11 #include <stdlib.h> |
| 12 #include <string.h> |
| 13 #include <sys/stat.h> |
| 14 #include <sys/types.h> |
| 15 #include <unistd.h> |
| 16 #include <uuid/uuid.h> |
| 17 |
| 18 #include "cgptlib_internal.h" |
| 19 #include "endian.h" |
| 20 |
| 21 static void Usage(void) |
| 22 { |
| 23 printf("\nUsage: %s boot [OPTIONS] DRIVE\n\n" |
| 24 "Edit the PMBR sector for legacy BIOSes\n\n" |
| 25 "Options:\n" |
| 26 " -i NUM Set bootable partition\n" |
| 27 " -b FILE Install bootloader code in the PMBR\n" |
| 28 " -p Create legacy PMBR partition table\n" |
| 29 "\n" |
| 30 "With no options, it will just print the PMBR boot guid\n" |
| 31 "\n", progname); |
| 32 } |
| 33 |
| 34 |
| 35 int cmd_boot(int argc, char *argv[]) { |
| 36 struct drive drive; |
| 37 int partition = 0; |
| 38 char *bootfile = 0; |
| 39 int create_pmbr = 0; |
| 40 int retval = 1; |
| 41 int gpt_retval; |
| 42 |
| 43 int c; |
| 44 int errorcnt = 0; |
| 45 char *e = 0; |
| 46 |
| 47 opterr = 0; // quiet, you |
| 48 while ((c=getopt(argc, argv, ":hi:b:p")) != -1) |
| 49 { |
| 50 switch (c) |
| 51 { |
| 52 case 'i': |
| 53 partition = (uint32_t)strtoul(optarg, &e, 0); |
| 54 if (!*optarg || (e && *e)) |
| 55 { |
| 56 Error("invalid argument to -%c: \"%s\"\n", c, optarg); |
| 57 errorcnt++; |
| 58 } |
| 59 break; |
| 60 case 'b': |
| 61 bootfile = optarg; |
| 62 break; |
| 63 case 'p': |
| 64 create_pmbr = 1; |
| 65 break; |
| 66 |
| 67 case 'h': |
| 68 Usage(); |
| 69 return CGPT_OK; |
| 70 case '?': |
| 71 Error("unrecognized option: -%c\n", optopt); |
| 72 errorcnt++; |
| 73 break; |
| 74 case ':': |
| 75 Error("missing argument to -%c\n", optopt); |
| 76 errorcnt++; |
| 77 break; |
| 78 default: |
| 79 errorcnt++; |
| 80 break; |
| 81 } |
| 82 } |
| 83 if (errorcnt) |
| 84 { |
| 85 Usage(); |
| 86 return CGPT_FAILED; |
| 87 } |
| 88 |
| 89 if (optind >= argc) { |
| 90 Error("missing drive argument\n"); |
| 91 return CGPT_FAILED; |
| 92 } |
| 93 |
| 94 if (CGPT_OK != DriveOpen(argv[optind], &drive)) |
| 95 return CGPT_FAILED; |
| 96 |
| 97 if (CGPT_OK != ReadPMBR(&drive)) { |
| 98 Error("Unable to read PMBR\n"); |
| 99 goto done; |
| 100 } |
| 101 |
| 102 if (create_pmbr) { |
| 103 drive.pmbr.magic[0] = 0x1d; |
| 104 drive.pmbr.magic[1] = 0x9a; |
| 105 drive.pmbr.sig[0] = 0x55; |
| 106 drive.pmbr.sig[1] = 0xaa; |
| 107 memset(&drive.pmbr.part, 0, sizeof(drive.pmbr.part)); |
| 108 drive.pmbr.part[0].f_head = 0x00; |
| 109 drive.pmbr.part[0].f_sect = 0x02; |
| 110 drive.pmbr.part[0].f_cyl = 0x00; |
| 111 drive.pmbr.part[0].type = 0xee; |
| 112 drive.pmbr.part[0].l_head = 0xff; |
| 113 drive.pmbr.part[0].l_sect = 0xff; |
| 114 drive.pmbr.part[0].l_cyl = 0xff; |
| 115 drive.pmbr.part[0].f_lba = htole32(1); |
| 116 uint32_t max = 0xffffffff; |
| 117 if (drive.gpt.drive_sectors < 0xffffffff) |
| 118 max = drive.gpt.drive_sectors - 1; |
| 119 drive.pmbr.part[0].num_sect = htole32(max); |
| 120 } |
| 121 |
| 122 if (partition) { |
| 123 if (GPT_SUCCESS != (gpt_retval = GptSanityCheck(&drive.gpt))) { |
| 124 Error("GptSanityCheck() returned %d: %s\n", |
| 125 gpt_retval, GptError(gpt_retval)); |
| 126 goto done; |
| 127 } |
| 128 |
| 129 if (partition > GetNumberOfEntries(&drive.gpt)) { |
| 130 Error("invalid partition number: %d\n", partition); |
| 131 goto done; |
| 132 } |
| 133 |
| 134 int index = partition - 1; |
| 135 GptEntry *entry = GetEntry(&drive.gpt, PRIMARY, index); |
| 136 memcpy(&drive.pmbr.boot_guid, &entry->unique, sizeof(Guid)); |
| 137 } |
| 138 |
| 139 if (bootfile) { |
| 140 int fd = open(bootfile, O_RDONLY); |
| 141 if (fd < 0) { |
| 142 Error("Can't read %s: %s\n", bootfile, strerror(errno)); |
| 143 goto done; |
| 144 } |
| 145 |
| 146 int n = read(fd, drive.pmbr.bootcode, sizeof(drive.pmbr.bootcode)); |
| 147 if (n < 1) { |
| 148 Error("problem reading %s: %s\n", bootfile, strerror(errno)); |
| 149 close(fd); |
| 150 goto done; |
| 151 } |
| 152 |
| 153 close(fd); |
| 154 } |
| 155 |
| 156 char buf[256]; |
| 157 GuidToStr(&drive.pmbr.boot_guid, buf); |
| 158 printf("%s\n", buf); |
| 159 |
| 160 // Write it all out |
| 161 if (CGPT_OK == WritePMBR(&drive)) |
| 162 retval = 0; |
| 163 |
| 164 done: |
| 165 (void) DriveClose(&drive, 1); |
| 166 return retval; |
| 167 } |
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