Changeset 148 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH25h_HDrvID.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/AH25h_HDrvID.asm (modified) (5 diffs)

trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH25h_HDrvID.asm

@@ -10 +10 @@
 ; AH25h_HandlerForGetDriveInformation
 ;   Parameters:
-;       AH:     Bios function 25h
-;       DL:     Drive number
+;       ES:     Same as in INTPACK
+;       DL:     Translated Drive number
+;       DS:DI:  Ptr to DPT (in RAMVARS segment)
+;       SS:BP:  Ptr to INTPACK
+;   Parameters on INTPACK in SS:BP:
 ;       ES:BX:  Ptr to buffer to receive 512-byte drive information
-;   Parameters loaded by Int13h_Jump:
-;       DS:     RAMVARS segment
-;   Returns:
-;       ES:BX:  Ptr to 512-byte buffer to receive drive Information
+;   Returns with INTPACK in SS:BP:
 ;       AH:     Int 13h return status
 ;       CF:     0 if succesfull, 1 if error
-;       IF:     1
-;   Corrupts registers:
-;       Flags
 ;--------------------------------------------------------------------
 ALIGN JUMP_ALIGN
 AH25h_HandlerForGetDriveInformation:
-    push    dx
-    push    cx
-    push    bx
-    push    ax
-    push    es
-
     ; Wait until previously selected drive is ready
-    call    FindDPT_ForDriveNumber      ; DS:DI now points to DPT
     call    HDrvSel_SelectDriveAndDisableIRQ
-    jc      SHORT .Return               ; Return if error
+    jc      SHORT .ReturnWithErrorCodeInAH      ; Return if error
 
     ; Get drive information
+    mov     bx, [bp+INTPACK.bx]
     call    HPIO_NormalizeDataPointer
     push    bx
@@ -45 +36 @@
     pop     di                          ; Pop buffer offset to DI
     call    AH25h_GetDriveInfo          ; Get drive information
-.Return:
-    pop     es
-    jmp     Int13h_PopXRegsAndReturn
+.ReturnWithErrorCodeInAH:
+    jmp     Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
 
 
@@ -87 +77 @@
     eCMOVE  cl, B_TIMEOUT_RESET         ;  If so, load long timeout
     call    HStatus_WaitRdy             ; Wait until ready to accept commands
-    jc      SHORT .Return               ; Return if error
+    jc      SHORT .ReturnWithErrorCodeInAH
 
     ; Output command
@@ -93 +83 @@
     out     dx, al                      ; Output command
     call    HStatus_WaitDrqDefTime      ; Wait until ready to transfer (no IRQ!)
-    jc      SHORT .Return               ; Return if error
+    jc      SHORT .ReturnWithErrorCodeInAH
 
     ; Transfer data
@@ -102 +92 @@
     call    HStatus_WaitRdyDefTime      ; Wait until drive ready
 
-.Return:
+.ReturnWithErrorCodeInAH:
     pop     bx
     pop     dx