Changeset 535 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Device

Timestamp:

Apr 8, 2013, 5:09:44 PM (12 years ago)

Author:

aitotat@…

google:author:

aitotat@gmail.com

Message:

Changes to XTIDE Universal BIOS:

• AH=48h now returns Device Parameter Table Extension when RETURN_DPTE_ON_AH48H is defined.
• Removed few unnecessary instructions from hardware interrupt handler.
• P-Cylinders returned by AH=48h are no longer calculated from L-CHS capacity.

File:

• trunk/XTIDE_Universal_BIOS/Src/Device/IDE/IdeIrq.asm (modified) (4 diffs)

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

@@ -26 +26 @@
 ;       DS:DI:  Ptr to DPT (in RAMVARS segment)
 ;   Returns:
-;       CF:     Set if wait done by operating system
-;               Cleared if BIOS must perform task flag polling
+;       Nothing
 ;   Corrupts registers:
 ;       AX
@@ -33 +32 @@
 ALIGN JUMP_ALIGN
 IdeIrq_WaitForIRQ:
-
-;--------------------------------------------------------------------
-; .NotifyOperatingSystemAboutWaitingForIRQ
-;   Parameters:
-;       Nothing
-;   Returns:
-;       CF:     Set if wait done by operating system
-;               Cleared if BIOS must perform task flag polling
-;   Corrupts registers:
-;       AX
-;--------------------------------------------------------------------
-.NotifyOperatingSystemAboutWaitingForIRQ:
     push    ds
 
@@ -53 +40 @@
     jc      SHORT .ReturnFromWaitNotify ;  If so, skip OS notification
     int     BIOS_SYSTEM_INTERRUPT_15h   ; OS hook, device busy
-    jnc     SHORT .ReturnFromWaitNotify ; CF cleared, BIOS handles waiting
 
-    ; Make sure that OS hooks are supported, otherwise the CF means unsupported function
-    test    ah, ah                      ; OS hook supported? (clears CF)
-    jnz     SHORT .ReturnFromWaitNotify ; AH has error, BIOS must do the wait
-    stc                                 ; Set CF since wait done by OS
 .ReturnFromWaitNotify:
     sti                                 ; Enable interrupts
@@ -99 +81 @@
 
     ; Issue Int 15h, function AX=9100h (Interrupt ready)
+    clc                                 ; Must be called with CF clear
     mov     ax, OS_HOOK_DEVICE_POST<<8  ; Interrupt ready, device 0 (HD)
     int     BIOS_SYSTEM_INTERRUPT_15h