Changeset 525 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h

Timestamp:

Mar 14, 2013, 9:45:07 PM (12 years ago)

Author:

krille_n_@…

google:author:

krille_n_@hotmail.com

Message:

Changes:

• Made some improvements to the stack switching in Int13h.asm.
• Added a tail-call optimized variant of the CALL_MENU_LIBRARY macro (JMP_MENU_LIBRARY).
• Other optimizations and fixes.

File:

• trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH1Eh_XTCF.asm (modified) (1 diff)

trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH1Eh_XTCF.asm

@@ -112 +112 @@
     jae     SHORT .SetMemoryMappedMode
 
-; We need to limit block size here. Consider this scenario;
-; 1. While in PIO mode or memory mapped mode, the drive is set to do
-;    block transfers larger than XTCF_DMA_MODE_MAX_BLOCK_SIZE.
-; 2. A call is subsequently made to change device mode to DEVICE_8BIT_XTCF_DMA.
-; 3. The call to AH24h_SetBlockSize fails but the change in device mode has been made.
-
     ; Set DMA Mode
     mov     BYTE [di+DPT_ATA.bDevice], DEVICE_8BIT_XTCF_DMA
     mov     al, [di+DPT_ATA.bBlockSize]
-    MIN_U   al, XTCF_DMA_MODE_MAX_BLOCK_SIZE
-    jmp     SHORT AH24h_SetBlockSize    ; Returns via AH23h_Enable8bitPioMode
+    cmp     al, XTCF_DMA_MODE_MAX_BLOCK_SIZE
+    jbe     SHORT AH24h_SetBlockSize
+    mov     al, XTCF_DMA_MODE_MAX_BLOCK_SIZE
+    jmp     SHORT AH24h_SetBlockSize
 
 .SetMemoryMappedMode: