Changeset 148 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH0h_HReset.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/AH0h_HReset.asm (modified) (5 diffs)

trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH0h_HReset.asm

@@ -10 +10 @@
 ; AH0h_HandlerForDiskControllerReset
 ;   Parameters:
-;       AH:     Bios function 0h
-;       DL:     Drive number (ignored so all drives are reset)
+;       DL:     Translated Drive number (ignored so all drives are reset)
 ;               If bit 7 is set all hard disks and floppy disks reset.
-;   Parameters loaded by Int13h_Jump:
-;       DS:     RAMVARS segment
-;   Returns:
+;       DS:DI:  Ptr to DPT (in RAMVARS segment)
+;       SS:BP:  Ptr to INTPACK
+;   Returns with INTPACK in SS:BP:
 ;       AH:     Int 13h return status (from drive requested in DL)
 ;       CF:     0 if succesfull, 1 if error
-;       IF:     1
-;   Corrupts registers:
-;       Flags
 ;--------------------------------------------------------------------
 ALIGN JUMP_ALIGN
 AH0h_HandlerForDiskControllerReset:
-    push    dx
-    push    cx
-    push    bx
-    push    ax
-
     eMOVZX  bx, dl                      ; Copy requested drive to BL, zero BH to assume no errors
     call    ResetFloppyDrivesWithInt40h
@@ -35 +26 @@
     call    ResetForeignHardDisks
     call    AH0h_ResetHardDisksHandledByOurBIOS
-ALIGN JUMP_ALIGN
 .SkipHardDiskReset:
-    mov     ah, bh                      ; Copy error code to AH
-    xor     al, al                      ; Zero AL...
-    cmp     al, bh                      ; ...and set CF if error
-    jmp     Int13h_PopXRegsAndReturn
+    mov     ah, bh
+    jmp     Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
 
 
@@ -57 +45 @@
     and     dl, 7Fh                     ; Clear hard disk bit
     xor     ah, ah                      ; Disk Controller Reset
-    int     INTV_FLOPPY_FUNC
+    int     BIOS_DISKETTE_INTERRUPT_40h
     jmp     SHORT BackupErrorCodeFromTheRequestedDriveToBH
 
@@ -96 +84 @@
     jnc     SHORT .Return               ; Return what was in BL unmodified
     mov     dl, 80h
-ALIGN JUMP_ALIGN
 .Return:
     ret
@@ -171 +158 @@
 BackupErrorCodeFromTheRequestedDriveToBH:
     cmp     dl, bl              ; Requested drive?
-    jne     SHORT .Return
-    mov     bh, ah
-ALIGN JUMP_ALIGN
-.Return:
+    eCMOVE  bh, ah
     ret