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Fix for disk error while Loading FreeLoader... discovered by Dave Albert

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In ReadSectorsCHS it was pop'ing values off the stack that hadn't been push'ed

svn path=/trunk/; revision=3417
This commit is contained in:
Brian Palmer 2002-08-28 04:46:17 +00:00
parent 7a32bdf315
commit 0f2ad47bfb
1 changed files with 4 additions and 3 deletions
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7
freeldr/bootsect/fat.asm
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@ -338,6 +338,7 @@ ReadSectorsLBA:
; CarryFlag set on error
ReadSectorsCHS:
popa
ReadSectorsCHSLoop:
pusha
xchg ax,cx
xchg ax,dx
@ -351,8 +352,8 @@ ReadSectorsCHS:
mov dh,dl ; Head to DH, drive to DL
mov dl,[BYTE bp+BootDrive] ; Drive number
mov ch,al ; Cylinder in CX
ror ah,1 ; Low 8 bits of cylinder in CH, high 2 bits
ror ah,1 ; in CL shifted to bits 6 & 7
ror ah,2 ; Low 8 bits of cylinder in CH, high 2 bits
; in CL shifted to bits 6 & 7
or cl,ah ; Or with sector number
mov ax,0201h
int 13h ; DISK - READ SECTORS INTO MEMORY
@ -375,7 +376,7 @@ NoCarryCHS:
mov es,bx
pop bx
; Increment read buffer for next sector
loop ReadSectorsCHS ; Read next sector
loop ReadSectorsCHSLoop ; Read next sector
ret