| 1 | ; Project name : XTIDE Universal BIOS
|
|---|
| 2 | ; Description : Defines for DPT structs containing custom
|
|---|
| 3 | ; Disk Parameter Table used by this BIOS.
|
|---|
| 4 | %ifndef CUSTOMDPT_INC
|
|---|
| 5 | %define CUSTOMDPT_INC
|
|---|
| 6 |
|
|---|
| 7 | ; Base DPT for all device types
|
|---|
| 8 | struc DPT ; 10 bytes
|
|---|
| 9 | ; General Disk Parameter Table related
|
|---|
| 10 | .wFlags:
|
|---|
| 11 | .bFlagsLow resb 1
|
|---|
| 12 | .bFlagsHigh resb 1
|
|---|
| 13 | .bIdevarsOffset resb 1 ; Offset to IDEVARS for this drive
|
|---|
| 14 |
|
|---|
| 15 | ; IDE Drive related
|
|---|
| 16 | ; .bLbaHeads and .twLbaSectors are used for LBA addressing only.
|
|---|
| 17 | .bLbaHeads: resb 1 ; Number of LBA assisted heads (1...255)
|
|---|
| 18 | .twLbaSectors resb 2 ; 48-bit sector count for LBA addressing
|
|---|
| 19 |
|
|---|
| 20 | ; .wPchsCylinders and .bPchsSectors are used for CHS addressing only.
|
|---|
| 21 | .wPchsCylinders resb 2 ; Number of P-CHS Cylinders (1...16383)
|
|---|
| 22 | .wPchsHeadsAndSectors:
|
|---|
| 23 | .bPchsHeads resb 1 ; Number of P-CHS heads (1...16)
|
|---|
| 24 | .bPchsSectors resb 1 ; Number of P-CHS Sectors per Track (1...63)
|
|---|
| 25 | endstruc
|
|---|
| 26 |
|
|---|
| 27 | ; DPT for ATA devices
|
|---|
| 28 | struc DPT_ATA ; 10 + 2 bytes = 12 bytes
|
|---|
| 29 | .dpt resb DPT_size
|
|---|
| 30 |
|
|---|
| 31 | ; Block size is specified in sectors (1, 2, 4, 8, 16, 32, 64 or 128)
|
|---|
| 32 | .wSetAndMaxBlock:
|
|---|
| 33 | .bSetBlock resb 1 ; Current block size (at least 1)
|
|---|
| 34 | .bMaxBlock resb 1 ; Maximum block size, 0 = block mode not supported
|
|---|
| 35 | endstruc
|
|---|
| 36 |
|
|---|
| 37 | %ifdef MODULE_SERIAL
|
|---|
| 38 | ; DPT for Serial devices
|
|---|
| 39 | struc DPT_SERIAL
|
|---|
| 40 | .dpt resb DPT_size
|
|---|
| 41 |
|
|---|
| 42 | .wSerialPortAndBaud:
|
|---|
| 43 | .bSerialPort resb 1 ; Serial connection I/O port address, divided by 4
|
|---|
| 44 | .bSerialBaud resb 1 ; Serial connection baud rate divisor
|
|---|
| 45 | endstruc
|
|---|
| 46 | %endif
|
|---|
| 47 |
|
|---|
| 48 | LARGEST_DPT_SIZE EQU DPT_ATA_size
|
|---|
| 49 |
|
|---|
| 50 |
|
|---|
| 51 | ; Bit definitions for DPT.bFlagsLow
|
|---|
| 52 | MASKL_DPT_CHS_SHIFT_COUNT EQU (7<<0) ; Bits 0...3, P-CHS to L-CHS bit shift count (0...4)
|
|---|
| 53 | FLGL_DPT_SLAVE EQU FLG_DRVNHEAD_DRV ; (1<<4), Drive is slave drive
|
|---|
| 54 | MASKL_DPT_ADDRESSING_MODE EQU (3<<5) ; Bits 5..6, Addressing Mode (bit 6 == FLG_DRVNHEAD_LBA)
|
|---|
| 55 | FLGL_DPT_ENABLE_IRQ EQU (1<<7)
|
|---|
| 56 |
|
|---|
| 57 | ; Bit definitions for DPT.bFlagsHigh
|
|---|
| 58 | FLGH_DPT_REVERSED_A0_AND_A3 EQU (1<<0) ; XTIDE mod, Address lines 0 and 3 reversed
|
|---|
| 59 | FLGH_DPT_BLOCK_MODE_SUPPORTED EQU (1<<1) ; Use block transfer commands (must be bit 1!)
|
|---|
| 60 | %ifdef MODULE_SERIAL
|
|---|
| 61 | FLGH_DPT_SERIAL_DEVICE EQU (1<<2) ; Serial Port Device
|
|---|
| 62 | %endif
|
|---|
| 63 | FLGH_DPT_INTERRUPT_IN_SERVICE EQU (1<<3) ; Set when waiting for IRQ
|
|---|
| 64 | FLGH_DPT_RESET_nDRDY EQU (1<<4) ; Drive ready to accept commands
|
|---|
| 65 | FLGH_DPT_RESET_nINITPRMS EQU (1<<5) ; Initialize Device Parameters successfull
|
|---|
| 66 | FLGH_DPT_RESET_nRECALIBRATE EQU (1<<6) ; Recalibrate successfull
|
|---|
| 67 | FLGH_DPT_RESET_nSETBLOCK EQU (1<<7) ; Initialize Block Mode successfull
|
|---|
| 68 | MASKH_DPT_RESET EQU 0F0h
|
|---|
| 69 |
|
|---|
| 70 | FLGH_DPT_SERIAL_FLOPPY EQU (1<<4)
|
|---|
| 71 | FLGH_DPT_SERIAL_FLOPPY_TYPE_MASK EQU 0e0h
|
|---|
| 72 | FLGH_DPT_SERIAL_FLOPPY_TYPE_FIELD_POSITION EQU 5
|
|---|
| 73 |
|
|---|
| 74 | ; Addressing modes for DPT.wFlags
|
|---|
| 75 | ADDRESSING_MODE_FIELD_POSITION EQU 5
|
|---|
| 76 | ADDRESSING_MODE_LCHS EQU 0 ; L-CHS Addressing Mode (NORMAL in many other BIOSes)
|
|---|
| 77 | ADDRESSING_MODE_PCHS EQU 1 ; P-CHS Addressing Mode (LARGE in many other BIOSes)
|
|---|
| 78 | ADDRESSING_MODE_LBA28 EQU 2 ; 28-bit LBA Addressing Mode
|
|---|
| 79 | ADDRESSING_MODE_LBA48 EQU 3 ; 48-bit LBA Addressing Mode
|
|---|
| 80 |
|
|---|
| 81 | ; Number of Sectors per Track is fixed to 63 for LBA assist calculation.
|
|---|
| 82 | ; 1024 cylinders, 256 heads, 63 sectors = 8.4 GB limit (but DOS does not support more than 255 heads)
|
|---|
| 83 | MAX_LCHS_CYLINDERS EQU 1024
|
|---|
| 84 | LBA_ASSIST_SPT EQU 63
|
|---|
| 85 |
|
|---|
| 86 |
|
|---|
| 87 | %endif ; CUSTOMDPT_INC
|
|---|
