| 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 | %ifdef MODULE_SERIAL_FLOPPY |
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| 13 | .bFlopCreateCnt: |
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| 14 | .bFlopCntAndFirst resb 1 ; Normally, packed starting floppy drive number (high order 7 bits) |
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| 15 | ; and number of drives (low order bit, max 2 drives supported). |
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| 16 | ; During initialization, until the end of DetectDrives_FromAllIDEControllers, |
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| 17 | ; this byte contains the raw number of floppy drives seen (using .bFlopCreateCnt) |
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| 18 | %else |
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| 19 | resb 1 ; alignment |
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| 20 | %endif |
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| 21 | .bXlatedDrv resb 1 ; Drive number after translation |
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| 22 | .wFDandHDswap: |
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| 23 | .bFDSwap resb 1 ; Floppy Drive to swap to 00h and vice versa |
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| 24 | .bHDSwap resb 1 ; Hard Drive to swap to 80h and vice versa |
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| 25 | endstruc |
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| 26 | |
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| 27 | ; RAM Variables. |
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| 28 | ; Variables should be kept to minimum since they might be located |
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| 29 | ; at the top of interrupt vectors. |
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| 30 | struc RAMVARS |
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| 31 | .fpOldI13h resb 4 ; Far pointer to old INT 13h handler |
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| 32 | .wSignature resb 2 ; Sign for finding stolen 1 kiB |
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| 33 | .bTimeoutTicksLeft resb 1 |
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| 34 | .bLastTimeoutUpdate resb 1 |
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| 35 | |
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| 36 | .wDrvCntAndFirst: |
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| 37 | .bFirstDrv resb 1 ; Number of first drive for this BIOS |
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| 38 | .wDrvCntAndFlopCnt: ; Both the hard disk and floppy counts in one word |
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| 39 | ; (yes, misaligned, but it is only used this way during initialization) |
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| 40 | .bDrvCnt resb 1 ; Number of drives handled by this BIOS |
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| 41 | |
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| 42 | ; Variables for drive number translation |
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| 43 | .xlateVars resb XLATEVARS_size |
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| 44 | endstruc |
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| 45 | |
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| 46 | %ifdef MODULE_SERIAL_FLOPPY |
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| 47 | %ifndef CHECK_FOR_UNUSED_ENTRYPOINTS |
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| 48 | %if RAMVARS.xlateVars != RAMVARS.bDrvCnt+1 || XLATEVARS.bFlopCreateCnt != 0 |
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| 49 | %error "bFlopCreateCnt needs to be the first thing in XLATEVARS, and .xlateVars needs to come immediately after .bDrvCnt. In at least one place, we read .wDrvCntAndFlopCnt to get both counts in one fetch" |
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| 50 | %endif |
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| 51 | %endif |
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| 52 | %endif |
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| 53 | |
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| 54 | RAMVARS_SIGNATURE EQU "Xu" ; RAMVARS signature for .wSignature |
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| 55 | |
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| 56 | ; |
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| 57 | ; IDEPACK NOTE: The first six bytes of this structure are directly put on the |
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| 58 | ; wire for MODULE_SERIAL, please do not change the order or insert other members. |
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| 59 | ; |
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| 60 | struc IDEPACK |
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| 61 | .bFeatures resb 1 |
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| 62 | .bDrvAndHead resb 1 ; LBA28 27...24 |
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| 63 | |
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| 64 | .wSectorCountAndLbaLow: |
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| 65 | .bSectorCount resb 1 |
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| 66 | .bSectorNumber: |
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| 67 | .bLbaLow resb 1 ; LBA 7...0 |
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| 68 | |
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| 69 | .wCylinder: |
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| 70 | .wLbaMiddleAndHigh: |
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| 71 | .bLbaMiddle resb 1 ; LBA 15...8 |
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| 72 | .bLbaHigh resb 1 ; LBA 23...16 |
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| 73 | |
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| 74 | .bCommand resb 1 |
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| 75 | .bDeviceControl resb 1 ; Offset 7 shared with PIOVARS |
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| 76 | resb 1 |
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| 77 | |
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| 78 | ; Parameters for 48-bit LBA |
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| 79 | .bLbaLowExt resb 1 ; LBA48 31...24 |
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| 80 | .wLbaMiddleAndHighExt: |
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| 81 | .bLbaMiddleExt resb 1 ; LBA48 39...32 |
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| 82 | .bLbaHighExt resb 1 ; LBA48 47...40 |
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| 83 | |
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| 84 | .intpack resb INTPACK_size |
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| 85 | endstruc |
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| 86 | |
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| 87 | EXTRA_BYTES_FOR_INTPACK EQU (IDEPACK_size - INTPACK_size) |
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| 88 | |
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| 89 | |
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| 90 | %endif ; RAMVARS_INC |
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