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 ; 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 | .wSignature resb 2 ; Sign for finding stolen 1 kiB |
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24 | .bTimeoutTicksLeft resb 1 |
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25 | .bLastTimeoutUpdate resb 1 |
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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 | ; IDEPACK NOTE: The first six bytes of this structure are directly put on the |
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39 | ; wire for MODULE_SERIAL, please do not change the order or insert other members. |
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40 | ; |
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41 | struc IDEPACK |
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42 | .bFeatures resb 1 |
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43 | .bDrvAndHead resb 1 ; LBA28 27...24 |
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44 | |
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45 | .wSectorCountAndLbaLow: |
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46 | .bSectorCount resb 1 |
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47 | .bSectorNumber: |
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48 | .bLbaLow resb 1 ; LBA 7...0 |
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49 | |
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50 | .wCylinder: |
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51 | .wLbaMiddleAndHigh: |
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52 | .bLbaMiddle resb 1 ; LBA 15...8 |
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53 | .bLbaHigh resb 1 ; LBA 23...16 |
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54 | |
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55 | .bCommand resb 1 |
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56 | .bDeviceControl resb 1 ; Offset 7 shared with PIOVARS |
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57 | resb 1 |
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58 | |
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59 | ; Parameters for 48-bit LBA |
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60 | .bLbaLowExt resb 1 ; LBA48 31...24 |
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61 | .wLbaMiddleAndHighExt: |
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62 | .bLbaMiddleExt resb 1 ; LBA48 39...32 |
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63 | .bLbaHighExt resb 1 ; LBA48 47...40 |
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64 | |
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65 | .intpack resb INTPACK_size |
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66 | endstruc |
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67 | |
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68 | EXTRA_BYTES_FOR_INTPACK EQU (IDEPACK_size - INTPACK_size) |
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69 | |
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70 | |
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71 | %endif ; RAMVARS_INC |
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