| 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 | ; Bit definitions for DPT.bFlagsLow
|
|---|
| 28 | MASKL_DPT_CHS_SHIFT_COUNT EQU (7<<0) ; Bits 0...3, P-CHS to L-CHS bit shift count (0...4)
|
|---|
| 29 | FLGL_DPT_SLAVE EQU FLG_DRVNHEAD_DRV ; (1<<4), Drive is slave drive
|
|---|
| 30 | MASKL_DPT_ADDRESSING_MODE EQU (3<<5) ; Bits 5..6, Addressing Mode (bit 6 == FLG_DRVNHEAD_LBA)
|
|---|
| 31 | FLGL_DPT_ENABLE_IRQ EQU (1<<7)
|
|---|
| 32 |
|
|---|
| 33 | ; Bit definitions for DPT.bFlagsHigh
|
|---|
| 34 | FLGH_DPT_REVERSED_A0_AND_A3 EQU (1<<0) ; XTIDE mod, Address lines 0 and 3 reversed
|
|---|
| 35 | FLGH_DPT_BLOCK_MODE_SUPPORTED EQU (1<<1) ; Use block transfer commands (must be bit 1!)
|
|---|
| 36 | %ifdef MODULE_SERIAL
|
|---|
| 37 | FLGH_DPT_SERIAL_DEVICE EQU (1<<2) ; Serial Port Device
|
|---|
| 38 | %endif
|
|---|
| 39 | FLGH_DPT_INTERRUPT_IN_SERVICE EQU (1<<3) ; Set when waiting for IRQ
|
|---|
| 40 |
|
|---|
| 41 | ; IDE device only
|
|---|
| 42 | FLGH_DPT_INITERROR EQU (1<<7)
|
|---|
| 43 |
|
|---|
| 44 | ; Serial device only
|
|---|
| 45 | FLGH_DPT_SERIAL_FLOPPY EQU (1<<4)
|
|---|
| 46 | FLGH_DPT_SERIAL_FLOPPY_TYPE_MASK EQU 0e0h
|
|---|
| 47 | FLGH_DPT_SERIAL_FLOPPY_TYPE_FIELD_POSITION EQU 5
|
|---|
| 48 |
|
|---|
| 49 | ; Addressing modes for DPT.wFlags
|
|---|
| 50 | ADDRESSING_MODE_FIELD_POSITION EQU 5
|
|---|
| 51 | ADDRESSING_MODE_LCHS EQU 0 ; L-CHS Addressing Mode (NORMAL in many other BIOSes)
|
|---|
| 52 | ADDRESSING_MODE_PCHS EQU 1 ; P-CHS Addressing Mode (LARGE in many other BIOSes)
|
|---|
| 53 | ADDRESSING_MODE_LBA28 EQU 2 ; 28-bit LBA Addressing Mode
|
|---|
| 54 | ADDRESSING_MODE_LBA48 EQU 3 ; 48-bit LBA Addressing Mode
|
|---|
| 55 |
|
|---|
| 56 |
|
|---|
| 57 | ; DPT for ATA devices
|
|---|
| 58 | struc DPT_ATA ; 10 + 2 bytes = 12 bytes
|
|---|
| 59 | .dpt resb DPT_size
|
|---|
| 60 |
|
|---|
| 61 | ; Block size is specified in sectors (1, 2, 4, 8, 16, 32, 64 or 128)
|
|---|
| 62 | .wSetAndMaxBlock:
|
|---|
| 63 | .bSetBlock resb 1 ; Current block size (do not set to zero!)
|
|---|
| 64 | .bMaxBlock resb 1 ; Maximum block size, 0 = block mode not supported
|
|---|
| 65 |
|
|---|
| 66 | %ifdef MODULE_ADVANCED_ATA ; +2 extra bytes = 14 bytes
|
|---|
| 67 | .bPioMode resb 1
|
|---|
| 68 | .bDevice resb 1
|
|---|
| 69 | %endif
|
|---|
| 70 | endstruc
|
|---|
| 71 |
|
|---|
| 72 |
|
|---|
| 73 | %ifdef MODULE_ADVANCED_ATA
|
|---|
| 74 | ; Temporary extension for DPT_ATA. Contents will be copied to BOOTMENUINFO and
|
|---|
| 75 | ; then these variables will be overridden by next DPT.
|
|---|
| 76 | struc DPT_ADVANCED_ATA
|
|---|
| 77 | .dpt_ata resb DPT_ATA_size
|
|---|
| 78 | .wIdeBasePort resb 2 ; IDE Base Port
|
|---|
| 79 | .wMinPioActiveTimeNs resb 2 ; Minimum PIO Active Time in ns
|
|---|
| 80 | .wMinPioRecoveryTimeNs resb 2 ; Minimum PIO Recovery Time in ns
|
|---|
| 81 | .wControllerID resb 2 ; Controller specific ID WORD
|
|---|
| 82 | .wControllerBasePort resb 2 ; Advanced Controller port (not IDE port)
|
|---|
| 83 | endstruc
|
|---|
| 84 | %endif
|
|---|
| 85 |
|
|---|
| 86 |
|
|---|
| 87 | %ifdef MODULE_SERIAL
|
|---|
| 88 | ; DPT for Serial devices
|
|---|
| 89 | struc DPT_SERIAL
|
|---|
| 90 | .dpt resb DPT_size
|
|---|
| 91 |
|
|---|
| 92 | .wSerialPortAndBaud:
|
|---|
| 93 | .bSerialPort resb 1 ; Serial connection I/O port address, divided by 4
|
|---|
| 94 | .bSerialBaud resb 1 ; Serial connection baud rate divisor
|
|---|
| 95 | endstruc
|
|---|
| 96 | %endif
|
|---|
| 97 |
|
|---|
| 98 |
|
|---|
| 99 | ; This is the common size for all DPTs. All DPTs must be equal size.
|
|---|
| 100 | LARGEST_DPT_SIZE EQU DPT_ATA_size
|
|---|
| 101 |
|
|---|
| 102 |
|
|---|
| 103 | ; Number of Sectors per Track is fixed to 63 for LBA assist calculation.
|
|---|
| 104 | ; 1024 cylinders, 256 heads, 63 sectors = 8.4 GB limit (but DOS does not support more than 255 heads)
|
|---|
| 105 | MAX_LCHS_CYLINDERS EQU 1024
|
|---|
| 106 | LBA_ASSIST_SPT EQU 63
|
|---|
| 107 |
|
|---|
| 108 |
|
|---|
| 109 | ;--------------------------------------------------------------------
|
|---|
| 110 | ; LIMIT_LBA_CYLINDERS_IN_DXAX_TO_LCHS_CYLINDERS
|
|---|
| 111 | ; Parameters:
|
|---|
| 112 | ; DX:AX: Number of LBA cylinders
|
|---|
| 113 | ; Returns:
|
|---|
| 114 | ; AX: Number of L-CHS cylinders
|
|---|
| 115 | ; Corrupts registers:
|
|---|
| 116 | ; Nothing
|
|---|
| 117 | ;--------------------------------------------------------------------
|
|---|
| 118 | %macro LIMIT_LBA_CYLINDERS_IN_DXAX_TO_LCHS_CYLINDERS 0
|
|---|
| 119 | test dx, dx
|
|---|
| 120 | jnz SHORT %%LoadMaxValueToAX
|
|---|
| 121 | cmp ax, MAX_LCHS_CYLINDERS
|
|---|
| 122 | jbe SHORT %%NoNeedToModify
|
|---|
| 123 | %%LoadMaxValueToAX:
|
|---|
| 124 | mov ax, MAX_LCHS_CYLINDERS
|
|---|
| 125 | %%NoNeedToModify:
|
|---|
| 126 | %endmacro
|
|---|
| 127 |
|
|---|
| 128 |
|
|---|
| 129 | %endif ; CUSTOMDPT_INC
|
|---|
