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Last change
on this file since 148 was 148, checked in by Tomi Tilli, 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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