Changeset 150 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Inc/CustomDPT.inc

Timestamp:

Apr 29, 2011, 7:04:13 PM (14 years ago)

Author:

Tomi Tilli

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/Inc/CustomDPT.inc (modified) (1 diff)

trunk/XTIDE_Universal_BIOS/Inc/CustomDPT.inc

@@ -5 +5 @@
 %define CUSTOMDPT_INC
 
+; Base DPT for all device types
+struc DPT   ; 8 bytes
+    ; General Disk Parameter Table related
+    .wFlags                     resb    2
+    .bIdevarsOffset             resb    1   ; Offset to IDEVARS for this drive
 
-; Base Disk Parameter Table for all hard disk drives.
-; DPT might have extensions for specific functions.
-struc DPT
-    ; General Disk Parameter Table related
-    .bSize      resb    1   ; Size of DPT (with extensions) in bytes
-    .wDrvNumAndFlags:
-    .bDrvNum    resb    1   ; Drive number
-    .bFlags     resb    1   ; DPT and Drive related flags
-    .bReset     resb    1   ; Drive reset status (for debugging)
-    .bIdeOff    resb    1   ; Offset to IDEVARS for this drive
+    ; L-CHS to P-CHS and L-CHS to LBA28 conversion related
+    .bLchsHeads                 resb    1   ; Number of L-CHS Heads (1...255)
 
-    ; Lookup values for L-CHS to P-CHS and L-CHS to LBA28 conversions
-    .bShLtoP    resb    1   ; Bit shift count for L-CHS to P-CHS conversion
-    .wLHeads    resb    2   ; Number of L-CHS Heads (1...256)
-
-    ; IDE related
-    .wPCyls     resb    2   ; Number of P-CHS (IDE) Cylinders (1...16383)
-    .wHeadsAndSectors:
-    .bPHeads    resb    1   ; Number of P-CHS (IDE) Heads (1...16)
-    .bPSect     resb    1   ; Number of P-CHS (IDE) Sectors per Track (1...63)
-    .bDrvSel    resb    1   ; Drive Selection byte for Device/Head Register
-    .bDrvCtrl   resb    1   ; Drive Control byte for Device Control Register
-
-    ; Related to Block Mode transfers.
-    ; Block size is specified in sectors (1, 2, 4, 8, 16, 32, 64 or 128).
-    .wSetAndMaxBlock:
-    .bSetBlock  resb    1   ; Currect block size (at least 1)
-    .bMaxBlock  resb    1   ; Maximum block size, 0 = block mode not supported
+    ; IDE Drive related
+    .wPchsCylinders             resb    2   ; Number of P-CHS (IDE) Cylinders (1...16383)
+    .wPchsHeadsAndSectors:
+    .bPchsHeads                 resb    1   ; Number of P-CHS (IDE) Heads (1...16)
+    .bPchsSectors               resb    1   ; Number of P-CHS (IDE) Sectors per Track (1...63)
 endstruc
 
-; Bit definitions for DPT.bFlags
-MASK_DPT_ADDR       EQU     110b    ; Bits 1..2, Addressing Mode
-FLG_DPT_EBIOS       EQU     (1<<0)  ; EBIOS functions supported for this drive
-FLG_DPT_FIRSTPART   EQU     (1<<3)  ; First BIOS Partition of the drive (drive reset allowed)
-FLG_DPT_PARTITION   EQU     (1<<4)  ; BIOS Partition
-FLG_DPT_USERCHS     EQU     (1<<5)  ; User has specified P-CHS parameters
+; DPT for ATA devices
+struc DPT_ATA   ; 8 + 2 bytes = 10 bytes
+    .dpt                        resb    DPT_size
 
-; Values for different addressing modes (MASK_DPT_ADDR for DPT.bFlags)
-ADDR_DPT_LCHS       EQU     0       ; L-CHS Addressing Mode (NORMAL in many other BIOSes)
-ADDR_DPT_PCHS       EQU     1       ; P-CHS Addressing Mode (LARGE in many other BIOSes)
-ADDR_DPT_LBA28      EQU     2       ; 28-bit LBA Addressing Mode
-ADDR_DPT_LBA48      EQU     3       ; 48-bit LBA Addressing Mode
+    ; Block size is specified in sectors (1, 2, 4, 8, 16, 32 or 64).
+    ; 128 is not allowed to prevent offset overflow during data transfer.
+    .wSetAndMaxBlock:
+    .bSetBlock                  resb    1   ; Current block size (at least 1)
+    .bMaxBlock                  resb    1   ; Maximum block size, 0 = block mode not supported
+endstruc
 
-; Bit definitions for DPT.bReset (inverted)
-FLG_RESET_nDRDY         EQU     (1<<0)  ; Drive ready to accept commands
-FLG_RESET_nINITPRMS     EQU     (1<<1)  ; Initialize Device Parameters successfull
-FLG_RESET_nRECALIBRATE  EQU     (1<<2)  ; Recalibrate successfull
-FLG_RESET_nSETBLOCK     EQU     (1<<3)  ; Initialize Block Mode successfull
-MASK_RESET_ALL          EQU     (FLG_RESET_nDRDY | FLG_RESET_nINITPRMS | FLG_RESET_nRECALIBRATE | FLG_RESET_nSETBLOCK)
+LARGEST_DPT_SIZE                EQU     DPT_ATA_size
 
 
-; Extended DPT for XTIDE Universal BIOS partitioned drive.
-; This struct cannot exist with EDPT (EBIOS support).
-struc PART_DPT
-    .dpt        resb    DPT_size
-    .dwStartLBA:
-    .twStartLBA resb    6   ; Starting 28- or 48-bit LBA for BIOS partition
-endstruc
+; Bit definitions for DPT.wFlags
+MASK_DPT_CHS_SHIFT_COUNT        EQU (7<<0)  ; Bits 0...3, P-CHS to L-CHS bit shift count (0...4)
+FLG_DPT_SLAVE                   EQU FLG_DRVNHEAD_DRV    ; (1<<4), Drive is slave drive
+MASK_DPT_ADDRESSING_MODE        EQU (3<<5)  ; Bits 5..6, Addressing Mode (bit 6 == FLG_DRVNHEAD_LBA)
+FLG_DPT_ENABLE_IRQ              EQU (1<<7)
+FLG_DPT_REVERSED_A0_AND_A3      EQU (1<<8)  ; XTIDE mod, Address lines 0 and 3 reversed
+FLG_DPT_SERIAL_DEVICE           EQU (1<<9)  ; Serial Port Device
+FLG_DPT_BLOCK_MODE_SUPPORTED    EQU (1<<10) ; Use block transfer commands
 
+FLG_DPT_RESET_nDRDY             EQU (1<<12) ; Drive ready to accept commands
+FLG_DPT_RESET_nINITPRMS         EQU (1<<13) ; Initialize Device Parameters successfull
+FLG_DPT_RESET_nRECALIBRATE      EQU (1<<14) ; Recalibrate successfull
+FLG_DPT_RESET_nSETBLOCK         EQU (1<<15) ; Initialize Block Mode successfull
+MASK_DPT_RESET                  EQU 0F000h
 
-; Extended DPT for EBIOS support.
-; This struct cannot exist with PDPT (XTIDE Universal BIOS partitioned drive).
-struc EBDPT
-    .dpt        resb    DPT_size
-    .dwCapacity:
-    .twCapacity resb    6   ; Total drive capacity in sectors
-endstruc
+; Addressing modes for DPT.wFlags
+ADDRESSING_MODE_FIELD_POSITION  EQU     5
+ADDRESSING_MODE_LCHS            EQU     0   ; L-CHS Addressing Mode (NORMAL in many other BIOSes)
+ADDRESSING_MODE_PCHS            EQU     1   ; P-CHS Addressing Mode (LARGE in many other BIOSes)
+ADDRESSING_MODE_LBA28           EQU     2   ; 28-bit LBA Addressing Mode
+ADDRESSING_MODE_LBA48           EQU     3   ; 48-bit LBA Addressing Mode