| 1 | ; Project name : XTIDE Universal BIOS |
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| 2 | ; Description : RAMVARS struct containing BIOS variables stored in RAM. |
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| 3 | %ifndef RAMVARS_INC |
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| 4 | %define RAMVARS_INC |
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| 5 | |
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| 6 | ; Segment when RAMVARS is stored to top of interrupt vectors. |
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| 7 | LITE_MODE_RAMVARS_SEGMENT EQU 30h |
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| 8 | |
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| 9 | |
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| 10 | ; Variables for translating drive numbers. |
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| 11 | struc XLATEVARS |
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| 12 | .bFDSwap resb 1 ; Floppy Drive to swap to 00h and vice versa |
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| 13 | .bHDSwap resb 1 ; Hard Drive to swap to 80h and vice versa |
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| 14 | .bXlatedDrv resb 1 ; Drive number after translation |
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| 15 | resb 1 ; For WORD alignment |
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| 16 | endstruc |
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| 17 | |
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| 18 | ; RAM Variables. |
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| 19 | ; Variables should be kept to minimum since they might be located |
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| 20 | ; at the top of interrupt vectors. |
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| 21 | struc RAMVARS |
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| 22 | .fpOldI13h resb 4 ; Far pointer to old INT 13h handler |
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| 23 | .wTimeoutCounter resb 2 |
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| 24 | .pInServiceDPT resb 2 ; Ptr to DPT for drive waiting for interrupt |
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| 25 | .wSignature resb 2 ; Sign for finding stolen 1 kiB |
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| 26 | |
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| 27 | .wDrvCntAndFirst: |
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| 28 | .bDrvCnt resb 1 ; Number of drives handled by this BIOS |
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| 29 | .bFirstDrv resb 1 ; Number of first drive for this BIOS |
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| 30 | |
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| 31 | ; Variables for drive number translation |
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| 32 | .xlateVars resb XLATEVARS_size |
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| 33 | endstruc |
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| 34 | |
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| 35 | RAMVARS_SIGNATURE EQU "Xu" ; RAMVARS signature for .wSignature |
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| 36 | |
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| 37 | |
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| 38 | struc IDEPACK |
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| 39 | .bDrvAndHead resb 1 ; LBA28 27...24 |
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| 40 | .bFeatures resb 1 |
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| 41 | |
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| 42 | .wSectorCountAndLbaLow: |
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| 43 | .bSectorCount resb 1 |
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| 44 | .bSectorNumber: |
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| 45 | .bLbaLow resb 1 ; LBA 7...0 |
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| 46 | |
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| 47 | .wCylinder: |
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| 48 | .wLbaMiddleAndHigh: |
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| 49 | .bLbaMiddle resb 1 ; LBA 15...8 |
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| 50 | .bLbaHigh resb 1 ; LBA 23...16 |
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| 51 | |
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| 52 | .bCommand resb 1 |
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| 53 | .bDeviceControl resb 1 ; Offset 7 shared with PIOVARS |
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| 54 | |
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| 55 | ; Parameters for 48-bit LBA |
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| 56 | .wSectorCountHighAndLbaLowExt: |
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| 57 | .bSectorCountHighExt resb 1 ; LBA48 Sector Count 15...8 |
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| 58 | .bLbaLowExt resb 1 ; LBA48 31...24 |
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| 59 | |
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| 60 | .wLbaMiddleAndHighExt: |
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| 61 | .bLbaMiddleExt resb 1 ; LBA48 39...32 |
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| 62 | .bLbaHighExt resb 1 ; LBA48 47...40 |
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| 63 | |
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| 64 | .intpack resb INTPACK_size |
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| 65 | endstruc |
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| 66 | |
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| 67 | EXTRA_WORDS_TO_RESERVE_FOR_INTPACK EQU ((IDEPACK_size - INTPACK_size) / 2) |
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| 68 | |
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| 69 | |
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| 70 | %endif ; RAMVARS_INC |
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