Changeset 148 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH15h_HSize.asm

Timestamp:

Mar 19, 2011, 8:09:41 PM (13 years ago)

Author:

aitotat

google:author:

aitotat

Message:

Changes to XTIDE Universal BIOS:

• INT 13h optimizations to save almost 100 bytes.

File:

• trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH15h_HSize.asm (modified) (2 diffs)

trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH15h_HSize.asm

@@ -10 +10 @@
 ; AH15h_HandlerForReadDiskDriveSize
 ;   Parameters:
-;       AH:     Bios function 15h
-;       DL:     Drive number
-;   Parameters loaded by Int13h_Jump:
-;       DS:     RAMVARS segment
-;   Returns:
+;       DL:     Translated Drive number
+;       DS:DI:  Ptr to DPT (in RAMVARS segment)
+;       SS:BP:  Ptr to INTPACK
+;   Returns with INTPACK in SS:BP:
 ;       If succesfull:
 ;           AH:     3 (Hard disk accessible)
@@ -23 +22 @@
 ;           CX:DX:  0
 ;           CF:     1
-;       IF:     1
-;   Corrupts registers:
-;       Flags
 ;--------------------------------------------------------------------
 ALIGN JUMP_ALIGN
 AH15h_HandlerForReadDiskDriveSize:
-    push    bx
-    push    ax
+    call    HCapacity_GetSectorCountFromOurAH08h        ; Sector count to DX:AX
+    mov     [bp+INTPACK.cx], dx                         ; HIWORD to CX
+    mov     [bp+INTPACK.dx], ax                         ; LOWORD to DX
 
-    call    HCapacity_GetSectorCountFromOurAH08h; Sector count to DX:AX (clears CF)
-    mov     cx, dx                              ; HIWORD to CX
-    xchg    dx, ax                              ; LOWORD to DX
-
-    pop     ax
-    pop     bx
-    mov     ah, 3                               ; Type code = Hard disk
-    jmp     Int13h_ReturnWithValueInDL
+    xor     ah, ah
+    call    HError_SetErrorCodeToIntpackInSSBPfromAH    ; Store success to BDA and CF
+    mov     BYTE [bp+INTPACK.ah], 3                     ; Type code = Hard disk
+    jmp     Int13h_ReturnFromHandlerWithoutStoringErrorCode