Changeset 150 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h.asm

Timestamp:

Apr 29, 2011, 7:04:13 PM (13 years ago)

Author:

aitotat

google:author:

aitotat

Message:

Changes to XTIDE Universal BIOS:

• Redesigned Disk Parameter Tables.
• Code generalizations for supporting non-IDE devices in the future.

File:

• trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h.asm (modified) (9 diffs)

trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h.asm

@@ -22 +22 @@
 Int13h_DiskFunctionsHandler:
     sti                                 ; Enable interrupts
-    SAVE_AND_GET_INTPACK_TO_SSBP
+    cld                                 ; String instructions to increment pointers
+    SAVE_AND_GET_INTPACK_WITH_EXTRA_WORDS_TO_SSBP EXTRA_WORDS_TO_RESERVE_FOR_INTPACK
 
     call    RamVars_GetSegmentToDS
@@ -46 +47 @@
 ;       DL:     Translated drive number
 ;       DS:     RAMVARS segment
-;       SS:BP:  Ptr to INTPACK
+;       SS:BP:  Ptr to IDEPACK
 ;       BX, DI: Corrupted on Int13h_DiskFunctionsHandler
 ;       Other:  Function specific INT 13h parameters 
@@ -58 +59 @@
 Int13h_DirectCallToAnotherBios:
     call    ExchangeCurrentInt13hHandlerWithOldInt13hHandler
-    mov     bx, [bp+INTPACK.bx]
-    mov     di, [bp+INTPACK.di]
-    mov     ds, [bp+INTPACK.ds]
-    push    WORD [bp+INTPACK.flags]
+    mov     bx, [bp+IDEPACK.intpack+INTPACK.bx]
+    mov     di, [bp+IDEPACK.intpack+INTPACK.di]
+    mov     ds, [bp+IDEPACK.intpack+INTPACK.ds]
+    push    WORD [bp+IDEPACK.intpack+INTPACK.flags]
     popf
     push    bp
-    mov     bp, [bp+INTPACK.bp]
+    mov     bp, [bp+IDEPACK.intpack+INTPACK.bp]
     int     BIOS_DISK_INTERRUPT_13h ; Can safely do as much recursion as it wants
 
@@ -70 +71 @@
     pop     bp  ; Standard INT 13h functions never uses BP as return register
 %ifdef USE_386
-    mov     [bp+INTPACK.gs], gs
-    mov     [bp+INTPACK.fs], fs
+    mov     [bp+IDEPACK.intpack+INTPACK.gs], gs
+    mov     [bp+IDEPACK.intpack+INTPACK.fs], fs
 %endif
-    mov     [bp+INTPACK.es], es
-    mov     [bp+INTPACK.ds], ds
-    mov     [bp+INTPACK.di], di
-    mov     [bp+INTPACK.si], si
-    mov     [bp+INTPACK.bx], bx
-    mov     [bp+INTPACK.dh], dh
-    mov     [bp+INTPACK.cx], cx
-    mov     [bp+INTPACK.ax], ax
+    mov     [bp+IDEPACK.intpack+INTPACK.es], es
+    mov     [bp+IDEPACK.intpack+INTPACK.ds], ds
+    mov     [bp+IDEPACK.intpack+INTPACK.di], di
+    mov     [bp+IDEPACK.intpack+INTPACK.si], si
+    mov     [bp+IDEPACK.intpack+INTPACK.bx], bx
+    mov     [bp+IDEPACK.intpack+INTPACK.dh], dh
+    mov     [bp+IDEPACK.intpack+INTPACK.cx], cx
+    mov     [bp+IDEPACK.intpack+INTPACK.ax], ax
     pushf
-    pop     WORD [bp+INTPACK.flags]
+    pop     WORD [bp+IDEPACK.intpack+INTPACK.flags]
     call    RamVars_GetSegmentToDS
     cmp     dl, [RAMVARS.xlateVars+XLATEVARS.bXlatedDrv]
     je      SHORT .ExchangeInt13hHandlers
-    mov     [bp+INTPACK.dl], dl     ; Something is returned in DL
+    mov     [bp+IDEPACK.intpack+INTPACK.dl], dl     ; Something is returned in DL
 ALIGN JUMP_ALIGN
 .ExchangeInt13hHandlers:
@@ -98 +99 @@
 ;   Parameters:
 ;       AH:     BIOS Error code
-;       SS:BP:  Ptr to INTPACK
+;       SS:BP:  Ptr to IDEPACK
 ;   Returns:
 ;       All registers are loaded from INTPACK
@@ -104 +105 @@
 ALIGN JUMP_ALIGN
 Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH:
-    call    HError_SetErrorCodeToBdaAndToIntpackInSSBPfromAH
+    call    Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH
 Int13h_ReturnFromHandlerWithoutStoringErrorCode:
-    or      WORD [bp+INTPACK.flags], FLG_FLAGS_IF   ; Return with interrupts enabled
+    or      WORD [bp+IDEPACK.intpack+INTPACK.flags], FLG_FLAGS_IF   ; Return with interrupts enabled
     mov     sp, bp                                  ; Now we can exit anytime
-    RESTORE_INTPACK_FROM_SSBP
+    RESTORE_INTPACK_WITH_EXTRA_WORDS_FROM_SSBP EXTRA_WORDS_TO_RESERVE_FOR_INTPACK
 
 
@@ -146 +147 @@
     LOAD_BDA_SEGMENT_TO es, di
     mov     di, [RAMVARS.fpOldI13h]
+    cli
     xchg    di, [es:BIOS_DISK_INTERRUPT_13h*4]
     mov     [RAMVARS.fpOldI13h], di
@@ -152 +154 @@
     mov     [RAMVARS.fpOldI13h+2], di
     pop     es
+    sti
+    ret
+
+
+;--------------------------------------------------------------------
+; Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH
+; Int13h_SetErrorCodeToIntpackInSSBPfromAH
+;   Parameters:
+;       AH:     BIOS error code (00h = no error)
+;       SS:BP:  Ptr to IDEPACK
+;   Returns:
+;       SS:BP:  Ptr to IDEPACK with error condition set
+;   Corrupts registers:
+;       DS, DI
+;--------------------------------------------------------------------
+ALIGN JUMP_ALIGN
+Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH:
+    ; Store error code to BDA
+    LOAD_BDA_SEGMENT_TO ds, di
+    mov     [BDA.bHDLastSt], ah
+
+    ; Store error code to INTPACK
+Int13h_SetErrorCodeToIntpackInSSBPfromAH:
+    mov     [bp+IDEPACK.intpack+INTPACK.ah], ah
+    test    ah, ah
+    jnz     SHORT .SetCFtoIntpack
+    and     BYTE [bp+IDEPACK.intpack+INTPACK.flags], ~FLG_FLAGS_CF
+    ret
+.SetCFtoIntpack:
+    or      BYTE [bp+IDEPACK.intpack+INTPACK.flags], FLG_FLAGS_CF
     ret
 
@@ -224 +256 @@
 ;   dw  Int13h_UnsupportedFunction                      ; 3Fh, 
 ;   dw  Int13h_UnsupportedFunction                      ; 40h, 
-;   dw  Int13h_UnsupportedFunction                      ; 41h, Check if Extensions Present (EBIOS)
-;   dw  Int13h_UnsupportedFunction                      ; 42h, Extended Read Sectors (EBIOS)
-;   dw  Int13h_UnsupportedFunction                      ; 43h, Extended Write Sectors (EBIOS)
-;   dw  Int13h_UnsupportedFunction                      ; 44h, Extended Verify Sectors (EBIOS)
-;   dw  Int13h_UnsupportedFunction                      ; 45h, Lock and Unlock Drive (EBIOS)
-;   dw  Int13h_UnsupportedFunction                      ; 46h, Eject Media Request (EBIOS)
-;   dw  Int13h_UnsupportedFunction                      ; 47h, Extended Seek (EBIOS)
-;   dw  Int13h_UnsupportedFunction                      ; 48h, Get Extended Drive Parameters (EBIOS)
-;   dw  Int13h_UnsupportedFunction                      ; 49h, Get Extended Disk Change Status (EBIOS)
+;   dw  Int13h_UnsupportedFunction                      ; 41h, Check if Extensions Present (EBIOS)*
+;   dw  Int13h_UnsupportedFunction                      ; 42h, Extended Read Sectors (EBIOS)*
+;   dw  Int13h_UnsupportedFunction                      ; 43h, Extended Write Sectors (EBIOS)*
+;   dw  Int13h_UnsupportedFunction                      ; 44h, Extended Verify Sectors (EBIOS)*
+;   dw  Int13h_UnsupportedFunction                      ; 45h, Lock and Unlock Drive (EBIOS)***
+;   dw  Int13h_UnsupportedFunction                      ; 46h, Eject Media Request (EBIOS)***
+;   dw  Int13h_UnsupportedFunction                      ; 47h, Extended Seek (EBIOS)*
+;   dw  Int13h_UnsupportedFunction                      ; 48h, Get Extended Drive Parameters (EBIOS)*
+;   dw  Int13h_UnsupportedFunction                      ; 49h, Get Extended Disk Change Status (EBIOS)***
 ;   dw  Int13h_UnsupportedFunction                      ; 4Ah, Initiate Disk Emulation (Bootable CD-ROM)
 ;   dw  Int13h_UnsupportedFunction                      ; 4Bh, Terminate Disk Emulation (Bootable CD-ROM)
 ;   dw  Int13h_UnsupportedFunction                      ; 4Ch, Initiate Disk Emulation and Boot (Bootable CD-ROM)
 ;   dw  Int13h_UnsupportedFunction                      ; 4Dh, Return Boot Catalog (Bootable CD-ROM)
-;   dw  Int13h_UnsupportedFunction                      ; 4Eh, Set Hardware Configuration (EBIOS)
+;   dw  Int13h_UnsupportedFunction                      ; 4Eh, Set Hardware Configuration (EBIOS)**
+;
+;   * = Enhanced Drive Access Support (minimum required EBIOS functions)
+;  ** = Enhanced Disk Drive (EDD) Support
+; *** = Drive Locking and Ejecting Support