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