Changeset 124 for trunk/bootcode/regular/other.asm

Timestamp:

Apr 8, 2017, 12:27:24 AM (8 years ago)

Author:

Ben Rietbroek

Message:

Use SI instead of BX for actions on sector buffers [v1.1.1-testing]

CAUTION:
This is a testbuild !
AirBoot uses the BIOS to access disks and a small coding error can trash
partition tables or other vital disk structures. You are advised to make
backups of TRACK0 and EBRs before using this testbuild. More info at:
​https://rousseaux.github.io/netlabs.air-boot/pdf/AirBoot-v1.1.0-manual.pdf

File:

• trunk/bootcode/regular/other.asm (modified) (2 diffs)

trunk/bootcode/regular/other.asm

@@ -639 +639 @@
 ; Check if a loaded sector is all zeros
 ;------------------------------------------------------------------------------
-; IN    : BX pointer to memblock
+; IN    : SI pointer to sector buffer
 ; OUT   : ZF=1 block if all zeros
 ; NOTE  : Segment used is DS
 ;------------------------------------------------------------------------------
-IsSectorZero    Proc    Near    Uses cx
+IsSectorBufferZero  Proc    Near    Uses bx cx
+        mov     bx, si          ; Address of sector buffer
         mov     cx, sector_size ; Normal size of a sector (512 bytes)
         call    IsMemBlockZero  ; Check the memory block
         ret
-IsSectorZero    EndP
+IsSectorBufferZero  EndP
 
 ;------------------------------------------------------------------------------
@@ -685 +686 @@
 ; Clears a sector buffer
 ;------------------------------------------------------------------------------
-; IN    : BX pointer to sector buffer
+; IN    : SI pointer to sector buffer
 ; OUT   : Nothing
 ; NOTE  : Segment used is DS
 ;------------------------------------------------------------------------------
-ClearSectorBuffer   Proc    Near    Uses cx
+ClearSectorBuffer   Proc    Near    Uses bx cx
+        mov     bx, si              ; Address of sector buffer
         mov     cx, sector_size     ; Normal size of a sector (512 bytes)
         call    ClearMemBlock       ; Clear the sector buffer