Changeset 363 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AHDh_HReset.asm

Timestamp:

Mar 26, 2012, 4:20:43 PM (13 years ago)

Author:

aitotat@…

google:author:

aitotat@gmail.com

Message:

Changes to XTIDE Universal BIOS:

• Added Advanced ATA Module (MODULE_ADVANCED_ATA) with native support for QDI Vision QD6500 and QD6580 VLB IDE Controllers.
• Hopefully optimized IDE transfer functions for 8088 (replaced some memory accesses from WORD to BYTE).
• XT build does not fit in 8k at the moment!!!

File:

• trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AHDh_HReset.asm (modified) (4 diffs)

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

@@ -53 +53 @@
 
     ; Initialize Master and Slave drives
-    eMOVZX  ax, [di+DPT.bIdevarsOffset]         ; (AL) pointer to controller we are looking to reset
+    eMOVZX  ax, BYTE [di+DPT.bIdevarsOffset]    ; (AL) pointer to controller we are looking to reset
                                                 ; (AH) initialize error code, assume success
 
-    mov     si, IterateAndResetDrives
+    mov     si, IterateAndResetDrives           ; Callback function for FindDPT_IterateAllDPTs
     call    FindDPT_IterateAllDPTs
 
@@ -73 +73 @@
 ; merged into overall error code for this controller.  Master will be reset
 ; first.  Note that the iteration will go until the end of the DPT list.
+;
+;   Parameters:
+;       AL:     Offset to IDEVARS for drives to initialize
+;       AH:     Error status from previous initialization
+;       DS:DI:  Ptr to DPT to examine
+;   Returns:
+;       AH:     Error status from initialization
+;       CF:     Set to iterate all DPTs
+;   Corrupts registers:
+;       AL, BX, DX
 ;--------------------------------------------------------------------
 IterateAndResetDrives:
@@ -78 +88 @@
     jne     .done
     push    ax
+    push    cx
     call    AH9h_InitializeDriveForUse          ; Reset Master and Slave (Master will come first in DPT list)
+
+%ifdef MODULE_ADVANCED_ATA
+    jc      SHORT .SkipControllerInitSinceError
+    call    InitializeAdvancedIdeControllers    ; Done after drive init so drives are first set to advanced PIO mode, then the controller
+.SkipControllerInitSinceError:
+%endif
+
+    pop     cx
     pop     ax
     jnc     .done
@@ -85 +104 @@
     stc                                         ; From IterateAllDPTs perspective, the DPT is never found (continue iteration)
     ret
+
+
+%ifdef MODULE_ADVANCED_ATA
+;--------------------------------------------------------------------
+; Here we initialize the more advanced controllers (VLB and PCI)
+; to get better performance for systems with 32-bit bus.
+;
+; This step is optional since the controllers use slowest possible
+; settings by default if they are not initialized.
+;
+; InitializeAdvancedIdeController
+;   Parameters:
+;       DS:DI:  Ptr to DPT
+;   Returns:
+;       CF:     Cleared if success or no controller to initialize
+;               Set if error
+;   Corrupts registers:
+;       AX, BX, CX, DX
+;--------------------------------------------------------------------
+InitializeAdvancedIdeControllers:
+    ; We want to initialize the advanced controller only after both
+    ; Master and Slave drive are initialized to correct PIO mode.
+    ; We check if next DPT is for the same IDE controller. If it is,
+    ; we skip the initialization.
+    mov     al, [di+DPT.bIdevarsOffset]
+    cmp     al, [di++LARGEST_DPT_SIZE+DPT.bIdevarsOffset]
+    je      SHORT .SkipInitializationUntilNextDrive ; CF cleared
+
+    jmp     AdvAtaInit_InitializeControllerForDPTinDSDI
+.SkipInitializationUntilNextDrive:
+    clc
+    ret
+
+%endif  ; MODULE_ADVANCED_ATA