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    • /[magellan-source]/tags/grubby-8_32/grubby.c

    Diff of /tags/grubby-8_32/grubby.c

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    revision 1717 by niro, Sat Feb 18 00:47:17 2012 UTC revision 1718 by niro, Sat Feb 18 00:49:41 2012 UTC
    # Line 51  Line 51 
    51  #define MAX_EXTRA_INITRDS  16 /* code segment checked by --bootloader-probe */  #define MAX_EXTRA_INITRDS  16 /* code segment checked by --bootloader-probe */
    52  #define CODE_SEG_SIZE  128 /* code segment checked by --bootloader-probe */  #define CODE_SEG_SIZE  128 /* code segment checked by --bootloader-probe */
    53    
    54    #define NOOP_OPCODE 0x90
    55    #define JMP_SHORT_OPCODE 0xeb
    56    
    57  /* comments get lumped in with indention */  /* comments get lumped in with indention */
    58  struct lineElement {  struct lineElement {
    59      char * item;      char * item;
    # Line 2468  int checkDeviceBootloader(const char * d Line 2471  int checkDeviceBootloader(const char * d
    2471      if (memcmp(boot, bootSect, 3))      if (memcmp(boot, bootSect, 3))
    2472   return 0;   return 0;
    2473    
    2474      if (boot[1] == 0xeb) {      if (boot[1] == JMP_SHORT_OPCODE) {
    2475   offset = boot[2] + 2;   offset = boot[2] + 2;
    2476      } else if (boot[1] == 0xe8 || boot[1] == 0xe9) {      } else if (boot[1] == 0xe8 || boot[1] == 0xe9) {
    2477   offset = (boot[3] << 8) + boot[2] + 2;   offset = (boot[3] << 8) + boot[2] + 2;
    2478      } else if (boot[0] == 0xeb) {      } else if (boot[0] == JMP_SHORT_OPCODE) {
    2479   offset = boot[1] + 2;        offset = boot[1] + 2;
    2480            /*
    2481     * it looks like grub, when copying stage1 into the mbr, patches stage1
    2482     * right after the JMP location, replacing other instructions such as
    2483     * JMPs for NOOPs. So, relax the check a little bit by skipping those
    2484     * different bytes.
    2485     */
    2486          if ((bootSect[offset + 1] == NOOP_OPCODE)
    2487      && (bootSect[offset + 2] == NOOP_OPCODE)) {
    2488     offset = offset + 3;
    2489          }
    2490      } else if (boot[0] == 0xe8 || boot[0] == 0xe9) {      } else if (boot[0] == 0xe8 || boot[0] == 0xe9) {
    2491   offset = (boot[2] << 8) + boot[1] + 2;   offset = (boot[2] << 8) + boot[1] + 2;
    2492      } else {      } else {
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