Changeset 584 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Handlers

Timestamp:

Apr 25, 2015, 7:17:41 PM (10 years ago)

Author:

Tomi Tilli

google:author:

aitotat

Message:

Changes to XTIDE Universal BIOS:

• Added support for Lo-tech 8-bit IDE Adapter (untested)

Location:

trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h

Files:

• AH1Eh_XTCF.asm (modified) (3 diffs)
• AH23h_HFeatures.asm (modified) (2 diffs)

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

@@ -111 +111 @@
     ;       Selected transfer mode is stored in BIOS variable (DPT_ATA.bDevice).
 
-    ; Note that when selecting 'DEVICE_8BIT_PIO_MODE_WITH_BIU_OFFLOAD' mode,
+    ; Note that when selecting 'DEVICE_8BIT_XTCF_PIO8_WITH_BIU_OFFLOAD' mode,
     ; the ATA device (i.e. CompactFlash card) will operate in 8-bit mode, but
     ; data will be transferred from its data register using 16-bit CPU instructions
@@ -134 +134 @@
     dec     ax                      ; XTCF_8BIT_PIO_MODE_WITH_BIU_OFFLOAD = 1
     jz      SHORT .Set8bitPioModeWithBIUOffload
+    dec     ax
+    jz      SHORT .Set16bitPioModeWithBIUOffload
 
     ; XTCF_DMA_MODE = 2 (allow 3 as well for more optimized code)
@@ -144 +146 @@
     mov     al, XTCF_DMA_MODE_MAX_BLOCK_SIZE
     jmp     SHORT AH24h_SetBlockSize
+
+.Set16bitPioModeWithBIUOffload:
+    pop     bx                              ; Do not enable 8-bit PIO...
+    ePUSH_T bx, AH23h_Disable8bitPioMode    ; ...disable it instead
+    mov     al, DEVICE_8BIT_XTCF_PIO16_WITH_BIU_OFFLOAD
+    SKIP2B  bx
 
 .Set8bitPioMode:

trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH23h_HFeatures.asm

@@ -78 +78 @@
 ;--------------------------------------------------------------------
 ; AH23h_Enable8bitPioMode
+; AH23h_Disable8bitPioMode
 ;   Parameters:
 ;       DS:DI:  Ptr to DPT (in RAMVARS segment)
@@ -91 +92 @@
     mov     si, FEATURE_ENABLE_8BIT_PIO_TRANSFER_MODE
     jmp     SHORT AH23h_SetControllerFeatures
+AH23h_Disable8bitPioMode:
+    mov     si, FEATURE_DISABLE_8BIT_PIO_TRANSFER_MODE
+    call    AH23h_SetControllerFeatures
+    xor     ah, ah          ; Clear error since modern drives might not understand the command and are
+    ret                     ; always in 16-bit mode anyway
 %endif