diff options
Diffstat (limited to 'boot.subx')
| -rw-r--r-- | boot.subx | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/boot.subx b/boot.subx index afabc193..2c468458 100644 --- a/boot.subx +++ b/boot.subx @@ -972,6 +972,7 @@ Primary-bus-secondary-drive: == code +# No more than 0x100 sectors load-sectors: # disk: (addr disk), lba: int, n: int, out: (addr stream byte) # . prologue 55/push-ebp @@ -980,6 +981,12 @@ load-sectors: # disk: (addr disk), lba: int, n: int, out: (addr stream byte) 50/push-eax 51/push-ecx 52/push-edx + # check precondition + 81 7/subop/compare *(ebp+0x10) 0x100/imm32 + { + 7e/jump-if-<= break/disp8 + (abort "load-sectors: no more than 0x100 sectors") + } # check for drive (drive-exists? *(ebp+8)) # => eax 3d/compare-eax-and 0/imm32/false |