diff options
| -rw-r--r-- | mbr/gptmbr.S | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/mbr/gptmbr.S b/mbr/gptmbr.S index 10dfd45a..4009643f 100644 --- a/mbr/gptmbr.S +++ b/mbr/gptmbr.S @@ -115,6 +115,7 @@ next: xorl %edx,%edx incw %ax movw $phdr, %bx + pushw %bx /* -8(%bp) phdr == bootsect */ call read_sector /* Number of partition sectors */ @@ -189,12 +190,13 @@ found_part: /* * boot: invoke the actual bootstrap. %ds:%si points to the - * partition information in memory. + * partition information in memory. The top word on the stack + * is phdr == 0x7c00 == the address of the boot sector. */ boot: movl (32+16)(%si),%eax movl (36+16)(%si),%edx - movw $bootsec,%bx + popw %bx call read_sector cmpw $0xaa55, -2(%bx) jne missing_os /* Not a valid boot sector */ |