| 1 | ; Project name : XTIDE Universal BIOS |
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| 2 | ; Description : Defines for DPT structs containing custom |
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| 3 | ; Disk Parameter Table used by this BIOS. |
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| 4 | %ifndef CUSTOMDPT_INC |
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| 5 | %define CUSTOMDPT_INC |
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| 6 | |
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| 7 | ; Base DPT for all device types |
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| 8 | struc DPT ; 10 bytes |
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| 9 | ; General Disk Parameter Table related |
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| 10 | .wFlags: |
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| 11 | .bFlagsLow resb 1 |
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| 12 | .bFlagsHigh resb 1 |
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| 13 | .bIdevarsOffset resb 1 ; Offset to IDEVARS for this drive |
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| 14 | |
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| 15 | ; IDE Drive related |
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| 16 | ; .bLbaHeads and .twLbaSectors are used for LBA addressing only. |
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| 17 | .bLbaHeads: resb 1 ; Number of LBA assisted heads (1...255) |
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| 18 | .twLbaSectors resb 2 ; 48-bit sector count for LBA addressing |
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| 19 | |
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| 20 | ; .wPchsCylinders and .bPchsSectors are used for CHS addressing only. |
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| 21 | .wPchsCylinders resb 2 ; Number of P-CHS Cylinders (1...16383) |
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| 22 | .wPchsHeadsAndSectors: |
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| 23 | .bPchsHeads resb 1 ; Number of P-CHS heads (1...16) |
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| 24 | .bPchsSectors resb 1 ; Number of P-CHS Sectors per Track (1...63) |
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| 25 | endstruc |
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| 26 | |
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| 27 | ; Bit definitions for DPT.bFlagsLow |
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| 28 | MASKL_DPT_CHS_SHIFT_COUNT EQU (7<<0) ; Bits 0...3, P-CHS to L-CHS bit shift count (0...4) |
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| 29 | FLGL_DPT_SLAVE EQU FLG_DRVNHEAD_DRV ; (1<<4), Drive is slave drive |
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| 30 | MASKL_DPT_ADDRESSING_MODE EQU (3<<5) ; Bits 5..6, Addressing Mode (bit 6 == FLG_DRVNHEAD_LBA) |
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| 31 | FLGL_DPT_ENABLE_IRQ EQU (1<<7) |
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| 32 | |
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| 33 | ; Bit definitions for DPT.bFlagsHigh |
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| 34 | FLGH_DPT_REVERSED_A0_AND_A3 EQU (1<<0) ; XTIDE mod, Address lines 0 and 3 reversed |
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| 35 | FLGH_DPT_BLOCK_MODE_SUPPORTED EQU (1<<1) ; Use block transfer commands (must be bit 1!) |
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| 36 | %ifdef MODULE_SERIAL |
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| 37 | FLGH_DPT_SERIAL_DEVICE EQU (1<<2) ; Serial Port Device |
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| 38 | %endif |
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| 39 | FLGH_DPT_INTERRUPT_IN_SERVICE EQU (1<<3) ; Set when waiting for IRQ |
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| 40 | |
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| 41 | ; IDE device only |
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| 42 | FLGH_DPT_INITERROR EQU (1<<7) |
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| 43 | |
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| 44 | ; Serial device only |
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| 45 | FLGH_DPT_SERIAL_FLOPPY EQU (1<<4) |
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| 46 | FLGH_DPT_SERIAL_FLOPPY_TYPE_MASK EQU 0e0h |
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| 47 | FLGH_DPT_SERIAL_FLOPPY_TYPE_FIELD_POSITION EQU 5 |
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| 48 | |
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| 49 | ; Addressing modes for DPT.wFlags |
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| 50 | ADDRESSING_MODE_FIELD_POSITION EQU 5 |
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| 51 | ADDRESSING_MODE_LCHS EQU 0 ; L-CHS Addressing Mode (NORMAL in many other BIOSes) |
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| 52 | ADDRESSING_MODE_PCHS EQU 1 ; P-CHS Addressing Mode (LARGE in many other BIOSes) |
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| 53 | ADDRESSING_MODE_LBA28 EQU 2 ; 28-bit LBA Addressing Mode |
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| 54 | ADDRESSING_MODE_LBA48 EQU 3 ; 48-bit LBA Addressing Mode |
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| 55 | |
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| 56 | |
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| 57 | ; DPT for ATA devices |
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| 58 | struc DPT_ATA ; 10 + 2 bytes = 12 bytes |
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| 59 | .dpt resb DPT_size |
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| 60 | |
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| 61 | ; Block size is specified in sectors (1, 2, 4, 8, 16, 32, 64 or 128) |
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| 62 | .wSetAndMaxBlock: |
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| 63 | .bSetBlock resb 1 ; Current block size (do not set to zero!) |
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| 64 | .bMaxBlock resb 1 ; Maximum block size, 0 = block mode not supported |
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| 65 | |
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| 66 | %ifdef MODULE_ADVANCED_ATA ; +2 extra bytes = 14 bytes |
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| 67 | .bPioMode resb 1 |
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| 68 | .bDevice resb 1 |
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| 69 | %endif |
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| 70 | endstruc |
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| 71 | |
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| 72 | |
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| 73 | %ifdef MODULE_ADVANCED_ATA |
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| 74 | ; Temporary extension for DPT_ATA. Contents will be copied to BOOTMENUINFO and |
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| 75 | ; then these variables will be overridden by next DPT. |
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| 76 | struc DPT_ADVANCED_ATA |
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| 77 | .dpt_ata resb DPT_ATA_size |
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| 78 | .wIdeBasePort resb 2 ; IDE Base Port |
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| 79 | .wMinPioActiveTimeNs resb 2 ; Minimum PIO Active Time in ns |
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| 80 | .wMinPioRecoveryTimeNs resb 2 ; Minimum PIO Recovery Time in ns |
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| 81 | .wControllerID resb 2 ; Controller specific ID WORD |
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| 82 | .wControllerBasePort resb 2 ; Advanced Controller port (not IDE port) |
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| 83 | endstruc |
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| 84 | %endif |
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| 85 | |
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| 86 | |
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| 87 | %ifdef MODULE_SERIAL |
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| 88 | ; DPT for Serial devices |
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| 89 | struc DPT_SERIAL |
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| 90 | .dpt resb DPT_size |
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| 91 | |
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| 92 | .wSerialPortAndBaud: |
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| 93 | .bSerialPort resb 1 ; Serial connection I/O port address, divided by 4 |
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| 94 | .bSerialBaud resb 1 ; Serial connection baud rate divisor |
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| 95 | endstruc |
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| 96 | %endif |
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| 97 | |
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| 98 | |
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| 99 | ; This is the common size for all DPTs. All DPTs must be equal size. |
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| 100 | LARGEST_DPT_SIZE EQU DPT_ATA_size |
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| 101 | |
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| 102 | |
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| 103 | ; Number of Sectors per Track is fixed to 63 for LBA assist calculation. |
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| 104 | ; 1024 cylinders, 256 heads, 63 sectors = 8.4 GB limit (but DOS does not support more than 255 heads) |
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| 105 | MAX_LCHS_CYLINDERS EQU 1024 |
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| 106 | LBA_ASSIST_SPT EQU 63 |
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| 107 | |
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| 108 | |
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| 109 | ;-------------------------------------------------------------------- |
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| 110 | ; LIMIT_LBA_CYLINDERS_IN_DXAX_TO_LCHS_CYLINDERS |
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| 111 | ; Parameters: |
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| 112 | ; DX:AX: Number of LBA cylinders |
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| 113 | ; Returns: |
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| 114 | ; AX: Number of L-CHS cylinders |
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| 115 | ; Corrupts registers: |
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| 116 | ; Nothing |
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| 117 | ;-------------------------------------------------------------------- |
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| 118 | %macro LIMIT_LBA_CYLINDERS_IN_DXAX_TO_LCHS_CYLINDERS 0 |
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| 119 | test dx, dx |
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| 120 | jnz SHORT %%LoadMaxValueToAX |
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| 121 | cmp ax, MAX_LCHS_CYLINDERS |
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| 122 | jbe SHORT %%NoNeedToModify |
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| 123 | %%LoadMaxValueToAX: |
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| 124 | mov ax, MAX_LCHS_CYLINDERS |
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| 125 | %%NoNeedToModify: |
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| 126 | %endmacro |
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| 127 | |
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| 128 | |
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| 129 | %endif ; CUSTOMDPT_INC |
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