Changeset 158 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH2h_HRead.asm

Timestamp:

May 2, 2011, 9:41:51 AM (14 years ago)

Author:

Tomi Tilli

google:author:

aitotat

Message:

Changes to XTIDE Universal BIOS:

• Optimized few bytes.

File:

• trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH2h_HRead.asm (modified) (2 diffs)

trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH2h_HRead.asm

@@ -28 +28 @@
 ALIGN JUMP_ALIGN
 AH2h_HandlerForReadDiskSectors:
-    call    AH2h_ExitInt13hIfSectorCountInIntpackIsZero
+    cmp     BYTE [bp+IDEPACK.intpack+INTPACK.al], 0
+    je      SHORT AH2h_ExitInt13hSinceSectorCountInIntpackIsZero
+
     mov     ah, COMMAND_READ_SECTORS    ; Load sector mode command
-    test    WORD [di+DPT.wFlags], FLG_DPT_BLOCK_MODE_SUPPORTED
+    test    BYTE [di+DPT.bFlagsHigh], FLGH_DPT_BLOCK_MODE_SUPPORTED
     eCMOVNZ ah, COMMAND_READ_MULTIPLE   ; Load block mode command
     mov     bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRQ)
@@ -44 +46 @@
 
 ;--------------------------------------------------------------------
-; AH2h_ExitInt13hIfSectorCountInIntpackIsZero
+; AH2h_ExitInt13hSinceSectorCountInIntpackIsZero
 ;   Parameters:
-;       SS:BP:  Ptr to IDEPACK
-;   Parameters on INTPACK:
-;       AL:     Number of sectors to transfer (1...255)
+;       Nothing
 ;   Returns:
-;       Nothing (does not return if error)
-;   Corrupts registers:
-;       Nothing
+;       Jumps to Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
 ;--------------------------------------------------------------------
-ALIGN JUMP_ALIGN
-AH2h_ExitInt13hIfSectorCountInIntpackIsZero:
-    cmp     BYTE [bp+IDEPACK.intpack+INTPACK.al], 0
-    je      SHORT .InvalidSectorCount
-    ret
-.InvalidSectorCount:
+AH2h_ExitInt13hSinceSectorCountInIntpackIsZero:
     mov     ah, RET_HD_INVALID
     jmp     Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH