diff options
Diffstat (limited to 'memdisk/memdisk.asm')
| -rw-r--r-- | memdisk/memdisk.asm | 19 |
1 files changed, 11 insertions, 8 deletions
diff --git a/memdisk/memdisk.asm b/memdisk/memdisk.asm index fc46e844..1e27e1e9 100644 --- a/memdisk/memdisk.asm +++ b/memdisk/memdisk.asm @@ -91,7 +91,9 @@ Pointers: dw Int13Start dw Int15Start dw PatchArea dw TotalSize + dw IretPtr +IretPtr equ Int13Start.iret Int13Start: ; Swap stack mov [cs:Stack],esp @@ -139,7 +141,7 @@ Int13Start: pop ax pop bp lss esp,[cs:Stack] - iret +.iret: iret .our_drive: ; Set up standard entry frame @@ -464,10 +466,10 @@ edd_setup_regs: cmp dword [es:si+4],-1 je .linear_address - movzx esi,word [es:si+4] ; Offset + movzx ebx,word [es:si+4] ; Offset movzx edi,word [es:si+6] ; Segment shl edi,4 - add esi,edi + add ebx,edi jmp .got_address .linear_address: @@ -480,23 +482,24 @@ edd_setup_regs: ; no really better code available jne .error - mov esi,[es:si+16] + mov ebx,[es:si+16] .got_address: cmp dword [es:si+12],0 ; LBA too large? jne .overrun movzx ecx, word [es:si+2] ; Sectors to transfer - mov edi,[es:si+8] ; Starting sector - mov eax,edi + mov esi,[es:si+8] ; Starting sector + mov eax,esi add eax,ecx jc .overrun cmp eax,[DiskSize] ja .overrun shl ecx,SECTORSIZE_LG2-2 ; Convert to dwords - shl edi,SECTORSIZE_LG2 ; Convert to an offset - add edi,[DiskBuf] + shl esi,SECTORSIZE_LG2 ; Convert to an offset + add esi,[DiskBuf] + mov edi,ebx pop es ret |