Changeset 33 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs

Timestamp:

Aug 23, 2010, 4:27:11 PM (14 years ago)

Author:

aitotat

google:author:

aitotat

Message:

Interrupt controllers are now unmasked during drive reset.

File:

• trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/RamVars.asm (modified) (6 diffs)

trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/RamVars.asm

@@ -2 +2 @@
 ; Project name  :   IDE BIOS
 ; Created date  :   14.3.2010
-; Last update   :   3.8.2010
+; Last update   :   23.8.2010
 ; Author        :   Tomi Tilli
 ; Description   :   Functions for accessings RAMVARS.
@@ -23 +23 @@
 ALIGN JUMP_ALIGN
 RamVars_Initialize:
-    call    RamVars_StealBaseMemory ; Get RAMVARS segment to DS even if no stealing
-    call    RamVars_ClearToZero
+    call    .StealMemoryForRAMVARS  ; Get RAMVARS segment to DS even if no stealing
+    call    .ClearRamvarsFromDS
     jmp     DriveXlate_Reset
 
-
-;--------------------------------------------------------------------
-; Steals base memory to be used for RAMVARS.
-;
-; RamVars_StealBaseMemory
+;--------------------------------------------------------------------
+; .StealMemoryForRAMVARS
 ;   Parameters:
 ;       Nothing
@@ -40 +37 @@
 ;--------------------------------------------------------------------
 ALIGN JUMP_ALIGN
-RamVars_StealBaseMemory:
+.StealMemoryForRAMVARS:
     test    BYTE [cs:ROMVARS.wFlags], FLG_ROMVARS_FULLMODE
-    jz      SHORT RamVars_GetSegmentToDS    ; No need to steal
-
-    LOAD_BDA_SEGMENT_TO ds, ax              ; Zero AX
+    jz      SHORT RamVars_GetSegmentToDS
+
+    LOAD_BDA_SEGMENT_TO ds, ax      ; Zero AX
     mov     al, [cs:ROMVARS.bStealSize]
-    sub     [BDA.wBaseMem], ax              ; Steal one or more kilobytes
-    mov     ax, [BDA.wBaseMem]              ; Load base memory left
-    eSHL_IM ax, 6                           ; Shift for segment address
-    mov     ds, ax                          ; Copy RAMVARS segment to DS
-    ret
-
-
-;--------------------------------------------------------------------
-; Returns segment to RAMVARS.
-; RAMVARS might be located at the top of interrupt vectors (0030:0000h)
-; or at the top of system base RAM.
-;
-; RamVars_GetSegmentToDS
-;   Parameters:
-;       Nothing
-;   Returns:
-;       DS:     RAMVARS segment
-;   Corrupts registers:
-;       DI
-;--------------------------------------------------------------------
-ALIGN JUMP_ALIGN
-RamVars_GetSegmentToDS:
-    test    BYTE [cs:ROMVARS.wFlags], FLG_ROMVARS_FULLMODE
-    jnz     SHORT RamVars_GetStolenSegmentToDS
-    mov     di, SEGMENT_RAMVARS_TOP_OF_INTERRUPT_VECTORS
-    mov     ds, di
-    ret
-
-ALIGN JUMP_ALIGN
-RamVars_GetStolenSegmentToDS:
-    LOAD_BDA_SEGMENT_TO ds, di
-    mov     di, [BDA.wBaseMem]      ; Load available base memory size in kB
-    eSHL_IM di, 6                   ; Segment to first stolen kB
-ALIGN JUMP_ALIGN
-.LoopStolenKBs:
-    mov     ds, di                  ; EBDA segment to DS
-    add     di, BYTE 64             ; DI to next stolen kB
-    cmp     WORD [FULLRAMVARS.wSign], W_SIGN_FULLRAMVARS
-    jne     SHORT .LoopStolenKBs    ; Loop until sign found (always found eventually)
-    ret
-
-
-;--------------------------------------------------------------------
-; Clears RAMVARS variables to zero.
-; FULLRAMVARS sign will be saved if available.
-;
-; RamVars_ClearToZero
+    sub     [BDA.wBaseMem], ax
+    mov     ax, [BDA.wBaseMem]
+    eSHL_IM ax, 6                   ; Segment to first stolen kB (*=40h)
+    mov     ds, ax
+    ret
+
+;--------------------------------------------------------------------
+; .ClearRamvarsFromDS
 ;   Parameters:
 ;       DS:     RAMVARS segment
@@ -101 +59 @@
 ;--------------------------------------------------------------------
 ALIGN JUMP_ALIGN
-RamVars_ClearToZero:
+.ClearRamvarsFromDS:
     call    FindDPT_PointToFirstDPT ; Get RAMVARS/FULLRAMVARS size to DI
     mov     cx, di                  ; Copy byte count to CX
@@ -110 +68 @@
     rep stosb
     mov     WORD [FULLRAMVARS.wSign], W_SIGN_FULLRAMVARS
+    ret
+
+
+;--------------------------------------------------------------------
+; Returns segment to RAMVARS.
+; RAMVARS might be located at the top of interrupt vectors (0030:0000h)
+; or at the top of system base RAM.
+;
+; RamVars_GetSegmentToDS
+;   Parameters:
+;       Nothing
+;   Returns:
+;       DS:     RAMVARS segment
+;   Corrupts registers:
+;       DI
+;--------------------------------------------------------------------
+ALIGN JUMP_ALIGN
+RamVars_GetSegmentToDS:
+    test    BYTE [cs:ROMVARS.wFlags], FLG_ROMVARS_FULLMODE
+    jnz     SHORT .GetStolenSegmentToDS
+    mov     di, SEGMENT_RAMVARS_TOP_OF_INTERRUPT_VECTORS
+    mov     ds, di
+    ret
+
+ALIGN JUMP_ALIGN
+.GetStolenSegmentToDS:
+    LOAD_BDA_SEGMENT_TO ds, di
+    mov     di, [BDA.wBaseMem]      ; Load available base memory size in kB
+    eSHL_IM di, 6                   ; Segment to first stolen kB (*=40h)
+ALIGN JUMP_ALIGN
+.LoopStolenKBs:
+    mov     ds, di                  ; EBDA segment to DS
+    add     di, BYTE 64             ; DI to next stolen kB
+    cmp     WORD [FULLRAMVARS.wSign], W_SIGN_FULLRAMVARS
+    jne     SHORT .LoopStolenKBs    ; Loop until sign found (always found eventually)
     ret
 
@@ -234 +227 @@
     and     dl, 7Fh                     ; Clear HD bit for drive count
     ret
+
+
+;--------------------------------------------------------------------
+; RamVars_GetIdeControllerCountToCX
+;   Parameters:
+;       Nothing
+;   Returns:
+;       CX:     Number of IDE controllers to handle
+;   Corrupts registers:
+;       Nothing
+;--------------------------------------------------------------------   
+ALIGN JUMP_ALIGN
+RamVars_GetIdeControllerCountToCX:
+    mov     cx, 1                   ; Assume lite mode (one controller)
+    test    BYTE [cs:ROMVARS.wFlags], FLG_ROMVARS_FULLMODE
+    jz      SHORT .Return
+    mov     cl, [cs:ROMVARS.bIdeCnt]
+ALIGN JUMP_ALIGN, ret
+.Return:
+    ret