| 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 | %ifdef MODULE_SERIAL |
|---|
| 15 | .bSerialPortAndBaud resb 1 ; Packed I/O port and baud rate for serial drives |
|---|
| 16 | %else |
|---|
| 17 | resb 1 ; without serial port support, alignment byte |
|---|
| 18 | %endif |
|---|
| 19 | |
|---|
| 20 | ; IDE Drive related |
|---|
| 21 | .dwCylinders resb 4 ; Number of Cylinders |
|---|
| 22 | .wHeadsAndSectors: |
|---|
| 23 | .bHeads resb 1 ; Number of Heads (1...255) |
|---|
| 24 | .bSectors resb 1 ; Number of 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 or 64). |
|---|
| 32 | ; 128 is not allowed to prevent offset overflow during data transfer. |
|---|
| 33 | .wSetAndMaxBlock: |
|---|
| 34 | .bSetBlock resb 1 ; Current block size (at least 1) |
|---|
| 35 | .bMaxBlock resb 1 ; Maximum block size, 0 = block mode not supported |
|---|
| 36 | endstruc |
|---|
| 37 | |
|---|
| 38 | LARGEST_DPT_SIZE EQU DPT_ATA_size |
|---|
| 39 | |
|---|
| 40 | |
|---|
| 41 | ; Bit definitions for DPT.bFlagsLow |
|---|
| 42 | MASKL_DPT_CHS_SHIFT_COUNT EQU (7<<0) ; Bits 0...3, P-CHS to L-CHS bit shift count (0...4) |
|---|
| 43 | FLGL_DPT_SLAVE EQU FLG_DRVNHEAD_DRV ; (1<<4), Drive is slave drive |
|---|
| 44 | MASKL_DPT_ADDRESSING_MODE EQU (3<<5) ; Bits 5..6, Addressing Mode (bit 6 == FLG_DRVNHEAD_LBA) |
|---|
| 45 | FLGL_DPT_ENABLE_IRQ EQU (1<<7) |
|---|
| 46 | |
|---|
| 47 | ; Bit definitions for DPT.bFlagsHigh |
|---|
| 48 | FLGH_DPT_REVERSED_A0_AND_A3 EQU (1<<0) ; XTIDE mod, Address lines 0 and 3 reversed |
|---|
| 49 | FLGH_DPT_BLOCK_MODE_SUPPORTED EQU (1<<1) ; Use block transfer commands (must be bit 1!) |
|---|
| 50 | %ifdef MODULE_SERIAL |
|---|
| 51 | FLGH_DPT_SERIAL_DEVICE EQU (1<<2) ; Serial Port Device |
|---|
| 52 | %endif |
|---|
| 53 | FLGH_DPT_INTERRUPT_IN_SERVICE EQU (1<<3) ; Set when waiting for IRQ |
|---|
| 54 | FLGH_DPT_RESET_nDRDY EQU (1<<4) ; Drive ready to accept commands |
|---|
| 55 | FLGH_DPT_RESET_nINITPRMS EQU (1<<5) ; Initialize Device Parameters successfull |
|---|
| 56 | FLGH_DPT_RESET_nRECALIBRATE EQU (1<<6) ; Recalibrate successfull |
|---|
| 57 | FLGH_DPT_RESET_nSETBLOCK EQU (1<<7) ; Initialize Block Mode successfull |
|---|
| 58 | MASKH_DPT_RESET EQU 0F0h |
|---|
| 59 | |
|---|
| 60 | ; Addressing modes for DPT.wFlags |
|---|
| 61 | ADDRESSING_MODE_FIELD_POSITION EQU 5 |
|---|
| 62 | ADDRESSING_MODE_LCHS EQU 0 ; L-CHS Addressing Mode (NORMAL in many other BIOSes) |
|---|
| 63 | ADDRESSING_MODE_PCHS EQU 1 ; P-CHS Addressing Mode (LARGE in many other BIOSes) |
|---|
| 64 | ADDRESSING_MODE_LBA28 EQU 2 ; 28-bit LBA Addressing Mode |
|---|
| 65 | ADDRESSING_MODE_LBA48 EQU 3 ; 48-bit LBA Addressing Mode |
|---|
| 66 | |
|---|
| 67 | %macro CustomDPT_GetUnshiftedAddressModeToALZF 0 |
|---|
| 68 | mov al, [di+DPT.bFlagsLow] |
|---|
| 69 | and al, MASKL_DPT_ADDRESSING_MODE |
|---|
| 70 | %endmacro |
|---|
| 71 | |
|---|
| 72 | ; Number of Sectors per Track is fixed to 63 for LBA assist calculation. |
|---|
| 73 | ; 1024 cylinders, 256 heads, 63 sectors = 8.4 GB limit (but DOS does not support more than 255 heads) |
|---|
| 74 | MAX_LCHS_CYLINDERS EQU 1024 |
|---|
| 75 | LBA_ASSIST_SPT EQU 63 |
|---|
| 76 | |
|---|
| 77 | |
|---|
| 78 | %endif ; CUSTOMDPT_INC |
|---|
