Changeset 473 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Device/IDE/JrIdeTransfer.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/Device/IDE/JrIdeTransfer.asm (modified) (10 diffs)

trunk/XTIDE_Universal_BIOS/Src/Device/IDE/JrIdeTransfer.asm

@@ -28 +28 @@
 endstruc
 
+SECTOR_ACCESS_WINDOW_SIZE   EQU     512 ; 512 bytes
+
 
 ; Section containing code
@@ -37 +39 @@
 ;       AL:     IDE command that was used to start the transfer
 ;               (all PIO read and write commands including Identify Device)
-;       ES:SI:  Ptr to normalized data buffer
+;       ES:SI:  Ptr to normalized data buffer (SI 0...15)
 ;       DS:DI:  Ptr to DPT (in RAMVARS segment)
 ;       SS:BP:  Ptr to IDEPACK
@@ -49 +51 @@
 ALIGN JUMP_ALIGN
 JrIdeTransfer_StartWithCommandInAL:
-    push    cs  ; We push CS here (segment of SAW) and later pop it to DS (reads) or ES (writes)
-
-    ; Initialize PIOVARS
-    xor     cx, cx
-    mov     [bp+MEMPIOVARS.bSectorsDone], cl
-    mov     cl, [bp+IDEPACK.bSectorCount]
-    mov     [bp+MEMPIOVARS.bSectorsLeft], cl
-    mov     cl, [di+DPT_ATA.bBlockSize]
-    mov     [bp+MEMPIOVARS.wSectorsInBlock], cx
+    ; Initialize MEMPIOVARS
+    xchg    cx, ax          ; IDE command to CL
+    xor     ax, ax
+    mov     [bp+MEMPIOVARS.bSectorsDone], al
+    mov     al, [bp+IDEPACK.bSectorCount]
+    mov     [bp+MEMPIOVARS.bSectorsLeft], al
+    mov     al, [di+DPT_ATA.bBlockSize]
+    mov     [bp+MEMPIOVARS.wSectorsInBlock], ax
     mov     [bp+MEMPIOVARS.fpDPT], di
     mov     [bp+MEMPIOVARS.fpDPT+2], ds
 
+    ; Get far pointer to Sector Access Window
+    mov     dx, [di+DPT.wBasePort]
+    cmp     BYTE [di+DPT_ATA.bDevice], DEVICE_8BIT_JRIDE_ISA
+    jne     SHORT .GetSectorAccessWindowForXTCF
+
+    ; Get Sector Access Window for JR-IDE/ISA
+    mov     di, JRIDE_SECTOR_ACCESS_WINDOW_OFFSET
+    mov     ds, dx      ; Segment for JR-IDE/ISA
+    jmp     SHORT .SectorAccessWindowLoadedToDSDI
+
+.GetSectorAccessWindowForXTCF:
+    xor     di, di
+    add     dl, XTCF_CONTROL_REGISTER
+    in      al, dx                  ; Read high byte for Sector Access Window segment
+    xchg    ah, al
+    mov     ds, ax
+
     ; Are we reading or writing?
-    test    al, 16  ; Bit 4 is cleared on all the read commands but set on 3 of the 4 write commands
+.SectorAccessWindowLoadedToDSDI:
+    test    cl, 16  ; Bit 4 is cleared on all the read commands but set on 3 of the 4 write commands
     jnz     SHORT WriteToSectorAccessWindow
-    cmp     al, COMMAND_WRITE_MULTIPLE
+    cmp     cl, COMMAND_WRITE_MULTIPLE
     je      SHORT WriteToSectorAccessWindow
     ; Fall to ReadFromSectorAccessWindow
@@ -71 +90 @@
 ; ReadFromSectorAccessWindow
 ;   Parameters:
-;       Stack:  Segment part of ptr to Sector Access Window
+;       DS:DI:  Ptr to Sector Access Window
 ;       ES:SI:  Normalized ptr to buffer to receive data
 ;       SS:BP:  Ptr to MEMPIOVARS
@@ -84 +103 @@
 ;--------------------------------------------------------------------
 ReadFromSectorAccessWindow:
-    pop     ds      ; CS -> DS
-    mov     di, si  ; ES:DI = destination
-    mov     si, JRIDE_SECTOR_ACCESS_WINDOW_OFFSET   ; DS:SI = source
-
+    xchg    si, di  ; DS:SI = source, ES:DI = Destination
     call    WaitUntilReadyToTransferNextBlock
     jc      SHORT ReturnWithMemoryIOtransferErrorInAH
@@ -140 +156 @@
 ; WriteToSectorAccessWindow
 ;   Parameters:
-;       Stack:  Segment part of ptr to Sector Access Window
+;       DS:DI:  Ptr to Sector Access Window
 ;       ES:SI:  Normalized ptr to buffer containing data
 ;       SS:BP:  Ptr to MEMPIOVARS
@@ -155 +171 @@
 WriteToSectorAccessWindow:
     push    es
-    pop     ds
-    pop     es  ; CS -> ES
-    mov     di, JRIDE_SECTOR_ACCESS_WINDOW_OFFSET
+    push    ds
+    pop     es      ; ES:DI = Sector Access Window (destination)
+    pop     ds      ; DS:SI = Ptr to source buffer
 
     ; Always poll when writing first block (IRQs are generated for following blocks)
@@ -205 +221 @@
 ALIGN JUMP_ALIGN
 .WriteBlock:
-    mov     ch, JRIDE_SECTOR_ACCESS_WINDOW_SIZE >> 9
+    mov     ch, SECTOR_ACCESS_WINDOW_SIZE >> 9
     rep movsw
     mov     di, bx  ; Reset for next sector
@@ -232 +248 @@
 ALIGN JUMP_ALIGN
 .ReadBlock:
-    mov     ch, JRIDE_SECTOR_ACCESS_WINDOW_SIZE >> 9
+    mov     ch, SECTOR_ACCESS_WINDOW_SIZE >> 9
     rep movsw
     mov     si, bx  ; Reset for next sector
@@ -261 +277 @@
 
 
-%if JRIDE_SECTOR_ACCESS_WINDOW_SIZE <> 512
-    %error "JRIDE_SECTOR_ACCESS_WINDOW_SIZE is no longer equal to 512. JrIdeTransfer.asm needs changes."
+%if SECTOR_ACCESS_WINDOW_SIZE <> 512
+    %error "SECTOR_ACCESS_WINDOW_SIZE is no longer equal to 512. JrIdeTransfer.asm needs changes."
 %endif