Changeset 473 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/AccessDPT.asm

Timestamp:

Oct 10, 2012, 6:22:23 PM (13 years ago)

Author:

aitotat@…

google:author:

aitotat@gmail.com

Message:

Changes to XTIDE Universal BIOS:

• Large changes to prepare full XT-CF support (DMA not yet implemented and memory mapped transfers are not working).

File:

• trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/AccessDPT.asm (modified) (4 diffs)

trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/AccessDPT.asm

@@ -20 +20 @@
 ; Section containing code
 SECTION .text
-
-%ifdef MODULE_ADVANCED_ATA
-;--------------------------------------------------------------------
-; AccessDPT_GetIdeBasePortToBX
-;   Parameters:
-;       DS:DI:  Ptr to Disk Parameter Table
-;   Returns:
-;       BX:     IDE Base Port Address
-;   Corrupts registers:
-;       Nothing
-;--------------------------------------------------------------------
-ALIGN JUMP_ALIGN
-AccessDPT_GetIdeBasePortToBX:
-    eMOVZX  bx, [di+DPT.bIdevarsOffset]         ; CS:BX points to IDEVARS
-    mov     bx, [cs:bx+IDEVARS.wPort]
-    ret
-%endif  ; MODULE_ADVANCED_ATA
-
 
 ;--------------------------------------------------------------------
@@ -113 +95 @@
 
 
+%ifdef MODULE_8BIT_IDE
+;--------------------------------------------------------------------
+; AccessDPT_IsThisDeviceXTCF
+;   Parameters:
+;       DS:DI:  Ptr to Disk Parameter Table
+;   Returns:
+;       AH:     Device Type
+;       ZF:     Set if XTCF
+;               Cleared if some other device
+;   Corrupts registers:
+;       Nothing
+;--------------------------------------------------------------------
+AccessDPT_IsThisDeviceXTCF:
+    mov     ah, [di+DPT_ATA.bDevice]
+    cmp     ah, DEVICE_8BIT_XTCF_PIO8
+    je      SHORT .DeviceIsXTCF
+    cmp     ah, DEVICE_8BIT_XTCF_DMA
+    je      SHORT .DeviceIsXTCF
+    cmp     ah, DEVICE_8BIT_XTCF_MEMMAP
+.DeviceIsXTCF:
+    ret
+%endif ; MODULE_8BIT_IDE
+
+
 %ifdef MODULE_EBIOS
 ;--------------------------------------------------------------------
@@ -142 +148 @@
 ;       Nothing
 ;--------------------------------------------------------------------
-ALIGN JUMP_ALIGN
 AccessDPT_GetPointerToDRVPARAMStoCSBX:
-    eMOVZX  bx, BYTE [di+DPT.bIdevarsOffset]    ; CS:BX points to IDEVARS
+    call    AccessDPT_GetIdevarsToCSBX
     add     bx, BYTE IDEVARS.drvParamsMaster    ; CS:BX points to Master Drive DRVPARAMS
     test    BYTE [di+DPT.bFlagsLow], FLGL_DPT_SLAVE
@@ -150 +155 @@
     add     bx, BYTE DRVPARAMS_size             ; CS:BX points to Slave Drive DRVPARAMS
 .ReturnPointerToDRVPARAMS:
+    ret
+
+
+;--------------------------------------------------------------------
+; Needed many times during initialization so it is better to
+; make it as a function to save bytes.
+;
+; AccessDPT_GetIdevarsToCSBX
+;   Parameters:
+;       DS:DI:  Ptr to Disk Parameter Table
+;   Returns:
+;       CS:BX:  Ptr to IDEVARS for the drive
+;   Corrupts registers:
+;       Nothing
+;--------------------------------------------------------------------
+AccessDPT_GetIdevarsToCSBX:
+    eMOVZX  bx, BYTE [di+DPT.bIdevarsOffset]
     ret