Changeset 148 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH9h_HInit.asm

Timestamp:

Mar 19, 2011, 8:09:41 PM (14 years ago)

Author:

Tomi Tilli

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/AH9h_HInit.asm (modified) (5 diffs)

trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH9h_HInit.asm

@@ -1 @@
-; File name     :   AH9h_HInit.asm
-; Project name  :   IDE BIOS
-; Created date  :   9.12.2007
-; Last update   :   14.1.2011
-; Author        :   Tomi Tilli,
-;               :   Krister Nordvall (optimizations)
+; Project name  :   XTIDE Universal BIOS
 ; Description   :   Int 13h function AH=9h, Initialize Drive Parameters.
 
@@ -15 +10 @@
 ; AH9h_HandlerForInitializeDriveParameters
 ;   Parameters:
-;       AH:     Bios function 9h
-;       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:
 ;       AH:     Int 13h return status
 ;       CF:     0 if succesfull, 1 if error
-;       IF:     1
-;   Corrupts registers:
-;       Flags
 ;--------------------------------------------------------------------
 ALIGN JUMP_ALIGN
 AH9h_HandlerForInitializeDriveParameters:
-    push    dx
-    push    cx
-    push    bx
-    push    ax
 %ifndef USE_186
     call    AH9h_InitializeDriveForUse
-    jmp     Int13h_PopXRegsAndReturn
+    jmp     Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
 %else
-    push    Int13h_PopXRegsAndReturn
+    push    Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
     ; Fall through to AH9h_InitializeDriveForUse
 %endif
@@ -46 +33 @@
 ; AH9h_InitializeDriveForUse
 ;   Parameters:
-;       DL:     Drive number
-;       DS:     RAMVARS segment
+;       DS:DI:  Ptr to DPT (in RAMVARS segment)
 ;   Returns:
-;       DS:DI:  Ptr to DPT
 ;       AH:     Int 13h return status
 ;       CF:     0 if succesfull, 1 if error
 ;   Corrupts registers:
-;       AL, BX
+;       AL, BX, DX
 ;--------------------------------------------------------------------
 ALIGN JUMP_ALIGN
 AH9h_InitializeDriveForUse:
-    push    dx
     push    cx
 
     ; Try to select drive and wait until ready
-    call    FindDPT_ForDriveNumber
     or      BYTE [di+DPT.bReset], MASK_RESET_ALL        ; Everything uninitialized
     call    HDrvSel_SelectDriveAndDisableIRQ
@@ -76 +59 @@
 .RecalibrateDrive:
     call    AH11h_RecalibrateDrive
-    mov     dl, [di+DPT.bDrvNum]        ; Restore DL
     jc      SHORT .InitializeBlockMode
     and     BYTE [di+DPT.bReset], ~FLG_RESET_nRECALIBRATE
 
     ; Initialize block mode transfers
-ALIGN JUMP_ALIGN
 .InitializeBlockMode:
     call    AH9h_InitializeBlockMode
-    ;mov        dl, [di+DPT.bDrvNum]        ; Restore DL
     jc      SHORT .ReturnNotSuccessfull
-    and     BYTE [di+DPT.bReset], ~FLG_RESET_nSETBLOCK
+    and     BYTE [di+DPT.bReset], ~FLG_RESET_nSETBLOCK  ; Keeps CF clear
 
 .ReturnNotSuccessfull:
     pop     cx
-    pop     dx
     ret
 
@@ -135 +114 @@
 ; AH9h_InitializeBlockMode
 ;   Parameters:
-;       DL:     Drive number
 ;       DS:DI:  Ptr to DPT
 ;   Returns: