Changeset 445 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH9h_HInit.asm

Timestamp:

Aug 29, 2012, 12:59:23 PM (13 years ago)

Author:

krille_n_@…

google:author:

krille_n_@hotmail.com

Message:

Changes:

• A speed optimization to the eSHL_IM macro for 386 and higher. This change breaks emulation in the sense that the macro will fail when given a memory operand as the first parameter.
• Memory_SumCXbytesFromESSItoAL now returns with the zero flag set/cleared according to the result.
• Unrolled all the 8 bit READ transfer loops to do 16 bytes per iteration. Added a new macro (UNROLL_SECTORS_IN_CX_TO_OWORDS) as part of it. Size wise this is expensive but I think it should be worth the ROM space. The WRITE transfer loops were left as is since writes are rare anyway (<10% of all disk I/O IIRC).
• Minor optimizations and fixes here and there.

File:

• trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH9h_HInit.asm (modified) (2 diffs)

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

@@ -244 +244 @@
 ;       Nothing
 ;--------------------------------------------------------------------
+DoNotEnable8bitMode:
 IgnoreInvalidCommandError:
     xor     ah, ah  ; Clears CF
@@ -270 +271 @@
 ;--------------------------------------------------------------------
 AH9h_Enable8bitPioModeForXTCF:
-    eMOVZX  bx, BYTE [di+DPT.bIdevarsOffset]
+    eMOVZX  bx, [di+DPT.bIdevarsOffset]
     cmp     BYTE [cs:bx+IDEVARS.bDevice], DEVICE_8BIT_XTCF
-    je      SHORT .Enable8bitMode
-    xor     ah, ah      ; Do nothing for this device
-    ret
-.Enable8bitMode:
+    jne     SHORT DoNotEnable8bitMode
+
     mov     si, FEATURE_ENABLE_8BIT_PIO_TRANSFER_MODE
     jmp     AH23h_SetControllerFeatures