Changeset 150 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/Common/HAddress.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/Common/HAddress.asm (modified) (11 diffs)

trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/Common/HAddress.asm

@@ -1 @@
-; File name     :   HAddress.asm
-; Project name  :   IDE BIOS
-; Created date  :   11.3.2010
-; Last update   :   4.4.2010
-; Author        :   Tomi Tilli
+; Project name  :   XTIDE Universal BIOS
 ; Description   :   Functions for address translations.
 
@@ -9 +5 @@
 SECTION .text
 
+; Jump table for conversion functions
+ALIGN WORD_ALIGN
+g_rgfnAddressTranslation:
+    dw      DoNotConvertLCHS                    ; 0, ADDR_DPT_LCHS
+    dw      ConvertLCHStoPCHS                   ; 1, ADDR_DPT_PCHS
+    dw      ConvertLCHStoLBARegisterValues      ; 2, ADDR_DPT_LBA28
+    dw      ConvertLCHStoLBARegisterValues      ; 3, ADDR_DPT_LBA48
+
+
 ;--------------------------------------------------------------------
-; Outputs sector count, L-CHS address and command to IDE registers.
-; This function does not wait until command has been completed.
-;
-; HAddress_ConvertParamsFromBiosLCHStoIDE
+; HAddress_OldInt13hAddressToIdeAddress
 ;   Parameters:
 ;       CH:     Cylinder number, bits 7...0
@@ -28 +30 @@
 ;       AX, DX
 ;--------------------------------------------------------------------
-ALIGN WORD_ALIGN
-g_rgfnAddressTranslation:
-    dw      HAddress_DoNotConvertLCHS                   ; 0, ADDR_DPT_LCHS
-    dw      HAddress_ConvertLCHStoPCHS                  ; 1, ADDR_DPT_PCHS
-    dw      HAddress_ConvertLCHStoLBARegisterValues     ; 2, ADDR_DPT_LBA28
-    dw      HAddress_ConvertLCHStoLBARegisterValues     ; 3, ADDR_DPT_LBA48
-
 ALIGN JUMP_ALIGN
-HAddress_ConvertParamsFromBiosLCHStoIDE:
-    mov     bl, [di+DPT.bFlags]
-    and     bx, BYTE MASK_DPT_ADDR                      ; Addressing mode to BX
+HAddress_OldInt13hAddressToIdeAddress:
+    call    AccessDPT_GetAddressingModeForWordLookToBX
     push    WORD [cs:bx+g_rgfnAddressTranslation]       ; Push return address
-    ; Fall to HAddress_ExtractLCHSFromBiosParams
+    ; Fall to HAddress_ExtractLCHSparametersFromOldInt13hAddress
 
 ;---------------------------------------------------------------------
-; Extracts L-CHS parameters from BIOS function parameters.
-;
-; HAddress_ExtractLCHSFromBiosParams:
+; HAddress_ExtractLCHSparametersFromOldInt13hAddress
 ;   Parameters:
 ;       CH:     Cylinder number, bits 7...0
@@ -58 +50 @@
 ;       Nothing
 ;--------------------------------------------------------------------
-ALIGN JUMP_ALIGN
-HAddress_ExtractLCHSFromBiosParams:
+HAddress_ExtractLCHSparametersFromOldInt13hAddress:
     mov     bl, cl              ; Copy sector number...
     and     bl, 3Fh             ; ...and limit to 1...63
@@ -70 +61 @@
 
 ;---------------------------------------------------------------------
-; Converts BIOS LCHS parameters to IDE P-CHS parameters.
+; Converts LCHS parameters to IDE P-CHS parameters.
 ; PCylinder = (LCylinder << n) + (LHead / PHeadCount)
 ; PHead     = LHead % PHeadCount
@@ -89 +80 @@
 ;--------------------------------------------------------------------
 ALIGN JUMP_ALIGN
-HAddress_ConvertLCHStoPCHS:
+ConvertLCHStoPCHS:
     ; LHead / PHeadCount and LHead % PHeadCount
     eMOVZX  ax, bh                  ; Copy L-CHS Head number to AX
-    div     BYTE [di+DPT.bPHeads]   ; AL = LHead / PHeadCount, AH = LHead % PHeadCount
+    div     BYTE [di+DPT.bPchsHeads]; AL = LHead / PHeadCount, AH = LHead % PHeadCount
     mov     bh, ah                  ; Copy P-CHS Head number to BH
     xor     ah, ah                  ; AX = LHead / PHeadCount
@@ -98 +89 @@
     ; (LCylinder << n) + (LHead / PHeadCount)
     mov     dx, cx                  ; Copy L-CHS Cylinder number to DX
-    mov     cl, [di+DPT.bShLtoP]    ; Load shift count
+    mov     cl, [di+DPT.wFlags]     ; Load shift count
+    and     cl, MASK_DPT_CHS_SHIFT_COUNT
     shl     dx, cl                  ; DX = LCylinder << n
     add     ax, dx                  ; AX = P-CHS Cylinder number
     mov     cx, ax                  ; Copy P-CHS Cylinder number to CX
-ALIGN JUMP_ALIGN
-HAddress_DoNotConvertLCHS:
+DoNotConvertLCHS:
     ret
 
@@ -109 +100 @@
 ;---------------------------------------------------------------------
 ; Converts LCHS parameters to 28-bit LBA address.
+; Only 24-bits are used since LHCS to LBA28 conversion has 8.4GB limit.
+; LBA = ((cylToSeek*headsPerCyl+headToSeek)*sectPerTrack)+sectToSeek-1
+;
 ; Returned address is in same registers that
 ; HAddress_DoNotConvertLCHS and HAddress_ConvertLCHStoPCHS returns.
 ;
-; HAddress_ConvertLCHStoLBARegisterValues:
+; ConvertLCHStoLBARegisterValues:
 ;   Parameters:
 ;       BL:     Sector number (1...63)
@@ -127 +121 @@
 ;--------------------------------------------------------------------
 ALIGN JUMP_ALIGN
-HAddress_ConvertLCHStoLBARegisterValues:
-    call    HAddress_ConvertLCHStoLBA28
-    mov     bl, al                  ; Sector Number Register (LBA 7...0)
-    mov     cl, ah                  ; Low Cylinder Register (LBA 15...8)
-    mov     ch, dl                  ; High Cylinder Register (LBA 23...16)
-    mov     bh, dh                  ; Drive and Head Register (LBA 27...24)
-    ret
-
-;---------------------------------------------------------------------
-; Converts LCHS parameters to 28-bit LBA address.
-; Only 24-bits are used since LHCS to LBA28 conversion has 8.4GB limit.
-; LBA = ((cylToSeek*headsPerCyl+headToSeek)*sectPerTrack)+sectToSeek-1
-;
-; HAddress_ConvertLCHStoLBA28:
-;   Parameters:
-;       BL:     Sector number (1...63)
-;       BH:     Head number (0...255)
-;       CX:     Cylinder number (0...1023)
-;       DS:DI:  Ptr to Disk Parameter Table
-;   Returns:
-;       DX:AX:  28-bit LBA address (DH is always zero)
-;   Corrupts registers:
-;       BX, CX
-;--------------------------------------------------------------------
-ALIGN JUMP_ALIGN
-HAddress_ConvertLCHStoLBA28:
+ConvertLCHStoLBARegisterValues:
     ; cylToSeek*headsPerCyl (18-bit result)
     mov     ax, cx                  ; Copy Cylinder number to AX
-    mul     WORD [di+DPT.wLHeads]   ; DX:AX = cylToSeek*headsPerCyl
+    eMOVZX  dx, BYTE [di+DPT.bLchsHeads]
+    mul     dx                      ; DX:AX = cylToSeek*headsPerCyl
 
     ; +=headToSeek (18-bit result)
@@ -163 +133 @@
 
     ; *=sectPerTrack (18-bit by 6-bit multiplication with 24-bit result)
-    eMOVZX  cx, BYTE [di+DPT.bPSect]; Load Sectors per Track
+    eMOVZX  cx, BYTE [di+DPT.bPchsSectors]  ; Load Sectors per Track
     xchg    ax, dx                  ; Hiword to AX, loword to DX
     mul     cl                      ; AX = hiword * Sectors per Track
@@ -176 +146 @@
     add     ax, bx                  ; Add to loword
     adc     dl, bh                  ; Add possible carry to byte2, BH=zero
+
+    ; Copy DX:AX to proper return registers
+    xchg    bx, ax                  ; BL = Sector Number Register (LBA 7...0)
+    mov     cl, bh                  ; Low Cylinder Register (LBA 15...8)
+    mov     ch, dl                  ; High Cylinder Register (LBA 23...16)
+    mov     bh, dh                  ; Drive and Head Register (LBA 27...24)
     ret