diff options
Diffstat (limited to 'memdisk/memdisk.inc')
| -rw-r--r-- | memdisk/memdisk.inc | 55 |
1 files changed, 52 insertions, 3 deletions
diff --git a/memdisk/memdisk.inc b/memdisk/memdisk.inc index c7eb9f1a..f4cb0fe6 100644 --- a/memdisk/memdisk.inc +++ b/memdisk/memdisk.inc @@ -27,11 +27,47 @@ call debug_tracer db %1 %endmacro +%macro WRITEHEX2 0-1 al +%ifnidni %1,al + push ax + mov al,%1 + call writehex2 + pop ax +%else + call writehex2 +%endif +%endmacro +%macro WRITEHEX4 0-1 ax +%ifnidni %1,ax + push ax + mov ax,%1 + call writehex4 + pop ax +%else + call writehex4 +%endif +%endmacro +%macro WRITEHEX8 0-1 eax +%ifnidni %1,eax + push eax + mov eax,%1 + call writehex8 + pop eax +%else + call writehex8 +%endif +%endmacro %else ; DEBUG_TRACERS %macro TRACER 1 %endmacro +%macro WRITEHEX2 0-1 +%endmacro +%macro WRITEHEX4 0-1 +%endmacro +%macro WRITEHEX8 0-1 +%endmacro %endif ; DEBUG_TRACERS @@ -90,7 +126,7 @@ Pointers: dw Int13Start IretPtr equ Int13Start.iret Int13Start: cmp word [cs:Recursive],0 - jne jmp_oldint13 + jne recursive ; Swap stack mov [cs:Stack],esp @@ -113,7 +149,15 @@ Int13Start: jb .nomatch ; Drive < Our drive dec dl ; Drive > Our drive, adjust drive # .nomatch: +%ifdef DEBUG_TRACERS + TRACER '!' + WRITEHEX2 dl + TRACER ',' + mov ax,[cs:SavedAX] + WRITEHEX4 +%else mov ax,[cs:SavedAX] +%endif inc word [cs:Recursive] pushf call far [cs:OldInt13] @@ -141,6 +185,8 @@ Int13Start: lss esp,[cs:Stack] .iret: iret +recursive: + TRACER '@' jmp_oldint13: jmp far [cs:OldInt13] @@ -154,6 +200,7 @@ our_drive: pushad mov bp,sp ; Point BP to the entry stack frame TRACER 'F' + WRITEHEX4 ; Note: AX == P_AX here cmp ah,Int13FuncsCnt-1 ja Invalid_jump @@ -227,13 +274,15 @@ GetDriveType: test byte [DriveNo],80h mov bl,02h ; Type 02h = floppy with changeline jz .floppy - ; Hard disks only... + ; Hard disks only! DO NOT set CX:DX for floppies... + ; it apparently causes Win98SE DOS to go into an loop + ; resetting the drive over and over. Sigh. inc bx ; Type = 03h -.floppy: mov dx,[DiskSize] ; Return the disk size in sectors mov P_DX,dx mov cx,[DiskSize+2] mov P_CX,cx +.floppy: mov P_AH,bl ; 02h floppy, 03h hard disk pop ax ; Drop return address xor ax,ax ; Success... |