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Last change
on this file since 148 was
148,
checked in by aitotat, 13 years ago
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Changes to XTIDE Universal BIOS:
- INT 13h optimizations to save almost 100 bytes.
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|
File size:
1.3 KB
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| 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 | SEGMENT_RAMVARS_TOP_OF_INTERRUPT_VECTORS 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 | .wIdeBase resb 2 ; Base port address for currently handled controller |
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| 24 | .wTimeoutCounter resb 2 |
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| 25 | |
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| 26 | .wDrvCntAndFirst: |
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| 27 | .bDrvCnt resb 1 ; Number of drives handled by this BIOS |
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| 28 | .bFirstDrv resb 1 ; Number of first drive for this BIOS |
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| 29 | |
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| 30 | ; Variables for drive number translation |
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| 31 | .xlateVars resb XLATEVARS_size |
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| 32 | endstruc |
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| 33 | |
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| 34 | ; Full mode RAM variables. |
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| 35 | struc FULLRAMVARS |
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| 36 | .ramVars resb RAMVARS_size |
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| 37 | .wSign resb 2 ; FULLRAMVARS signature for finding segment |
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| 38 | endstruc |
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| 39 | |
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| 40 | W_SIGN_FULLRAMVARS EQU "fR" ; FULLRAMVARS signature |
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| 41 | |
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| 42 | |
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| 43 | %endif ; RAMVARS_INC |
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