| 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 | |
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| 8 | ; Base Disk Parameter Table for all hard disk drives. |
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| 9 | ; DPT might have extensions for specific functions. |
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| 10 | struc DPT |
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| 11 | ; General Disk Parameter Table related |
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| 12 | .bSize resb 1 ; Size of DPT (with extensions) in bytes |
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| 13 | .wDrvNumAndFlags: |
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| 14 | .bDrvNum resb 1 ; Drive number |
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| 15 | .bFlags resb 1 ; DPT and Drive related flags |
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| 16 | .bReset resb 1 ; Drive reset status (for debugging) |
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| 17 | .bIdeOff resb 1 ; Offset to IDEVARS for this drive |
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| 18 | |
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| 19 | ; Lookup values for L-CHS to P-CHS and L-CHS to LBA28 conversions |
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| 20 | .bShLtoP resb 1 ; Bit shift count for L-CHS to P-CHS conversion |
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| 21 | .wLHeads resb 2 ; Number of L-CHS Heads (1...256) |
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| 22 | |
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| 23 | ; IDE related |
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| 24 | .wPCyls resb 2 ; Number of P-CHS (IDE) Cylinders (1...16383) |
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| 25 | .wHeadsAndSectors: |
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| 26 | .bPHeads resb 1 ; Number of P-CHS (IDE) Heads (1...16) |
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| 27 | .bPSect resb 1 ; Number of P-CHS (IDE) Sectors per Track (1...63) |
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| 28 | .bDrvSel resb 1 ; Drive Selection byte for Device/Head Register |
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| 29 | .bDrvCtrl resb 1 ; Drive Control byte for Device Control Register |
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| 30 | |
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| 31 | ; Related to Block Mode transfers. |
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| 32 | ; Block size is specified in sectors (1, 2, 4, 8, 16, 32, 64 or 128). |
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| 33 | .wSetAndMaxBlock: |
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| 34 | .bSetBlock resb 1 ; Currect block size (at least 1) |
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| 35 | .bMaxBlock resb 1 ; Maximum block size, 0 = block mode not supported |
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| 36 | endstruc |
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| 37 | |
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| 38 | ; Bit definitions for DPT.bFlags |
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| 39 | MASK_DPT_ADDR EQU 110b ; Bits 1..2, Addressing Mode |
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| 40 | FLG_DPT_EBIOS EQU (1<<0) ; EBIOS functions supported for this drive |
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| 41 | FLG_DPT_FIRSTPART EQU (1<<3) ; First BIOS Partition of the drive (drive reset allowed) |
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| 42 | FLG_DPT_PARTITION EQU (1<<4) ; BIOS Partition |
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| 43 | FLG_DPT_USERCHS EQU (1<<5) ; User has specified P-CHS parameters |
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| 44 | |
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| 45 | ; Values for different addressing modes (MASK_DPT_ADDR for DPT.bFlags) |
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| 46 | ADDR_DPT_LCHS EQU 0 ; L-CHS Addressing Mode (NORMAL in many other BIOSes) |
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| 47 | ADDR_DPT_PCHS EQU 1 ; P-CHS Addressing Mode (LARGE in many other BIOSes) |
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| 48 | ADDR_DPT_LBA28 EQU 2 ; 28-bit LBA Addressing Mode |
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| 49 | ADDR_DPT_LBA48 EQU 3 ; 48-bit LBA Addressing Mode |
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| 50 | |
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| 51 | ; Bit definitions for DPT.bReset (inverted) |
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| 52 | FLG_RESET_nDRDY EQU (1<<0) ; Drive ready to accept commands |
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| 53 | FLG_RESET_nINITPRMS EQU (1<<1) ; Initialize Device Parameters successfull |
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| 54 | FLG_RESET_nRECALIBRATE EQU (1<<2) ; Recalibrate successfull |
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| 55 | FLG_RESET_nSETBLOCK EQU (1<<3) ; Initialize Block Mode successfull |
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| 56 | MASK_RESET_ALL EQU (FLG_RESET_nDRDY | FLG_RESET_nINITPRMS | FLG_RESET_nRECALIBRATE | FLG_RESET_nSETBLOCK) |
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| 57 | |
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| 58 | |
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| 59 | ; Extended DPT for XTIDE Universal BIOS partitioned drive. |
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| 60 | ; This struct cannot exist with EDPT (EBIOS support). |
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| 61 | struc PART_DPT |
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| 62 | .dpt resb DPT_size |
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| 63 | .dwStartLBA: |
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| 64 | .twStartLBA resb 6 ; Starting 28- or 48-bit LBA for BIOS partition |
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| 65 | endstruc |
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| 66 | |
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| 67 | |
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| 68 | ; Extended DPT for EBIOS support. |
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| 69 | ; This struct cannot exist with PDPT (XTIDE Universal BIOS partitioned drive). |
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| 70 | struc EBDPT |
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| 71 | .dpt resb DPT_size |
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| 72 | .dwCapacity: |
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| 73 | .twCapacity resb 6 ; Total drive capacity in sectors |
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| 74 | endstruc |
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| 75 | |
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| 76 | |
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| 77 | %endif ; CUSTOMDPT_INC |
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