source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Inc/RamVars.inc@ 443

Last change on this file since 443 was 443, checked in by aitotat@…, 12 years ago

Changes to XTIDE Universal BIOS:

  • Offset to ATA-ID buffer will no longer get corrupted when trying to enable 8-bit mode for XT-CF.
  • Optimized A0<->A3 swapping a bit.
File size: 4.0 KB
Line 
1; Project name : XTIDE Universal BIOS
2; Description : RAMVARS struct containing BIOS variables stored in RAM.
3
4;
5; XTIDE Universal BIOS and Associated Tools
6; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team.
7;
8; This program is free software; you can redistribute it and/or modify
9; it under the terms of the GNU General Public License as published by
10; the Free Software Foundation; either version 2 of the License, or
11; (at your option) any later version.
12;
13; This program is distributed in the hope that it will be useful,
14; but WITHOUT ANY WARRANTY; without even the implied warranty of
15; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16; GNU General Public License for more details.
17; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
18;
19
20%ifndef RAMVARS_INC
21%define RAMVARS_INC
22
23; Segment when RAMVARS is stored to top of interrupt vectors.
24%ifndef USE_AT
25LITE_MODE_RAMVARS_SEGMENT EQU 30h
26%endif
27
28; RAM Variables.
29; Variables should be kept to minimum since they might be located
30; at the top of interrupt vectors.
31struc RAMVARS
32%ifdef RELOCATE_INT13H_STACK
33 .fpInt13hEntryStack resb 4
34 .dwStackChangeDSDI:
35 .wStackChangeDI resb 2
36 .wStackChangeDS resb 2
37 .wNewStackOffset resb 2
38%endif
39 .fpOldI13h resb 4 ; Far pointer to old INT 13h handler
40 .wSignature resb 2 ; Sign for finding stolen 1 kiB
41 .bTimeoutTicksLeft resb 1
42 .bLastTimeoutUpdate resb 1
43
44 .wFirstDrvAndCount:
45 .bFirstDrv resb 1 ; Number of first drive for this BIOS
46 .wDrvCntAndFlopCnt: ; Both the hard disk and floppy counts in one word
47 ; (yes, misaligned, but it is only used this way during initialization)
48 .bDrvCnt resb 1 ; Number of drives handled by this BIOS
49
50 ; Variables for drive number translation
51%ifdef MODULE_HOTKEYS
52 .xlateVars resb XLATEVARS_size
53%endif
54endstruc
55
56
57; Variables for translating drive numbers.
58%ifdef MODULE_HOTKEYS
59 struc XLATEVARS
60 %ifdef MODULE_SERIAL_FLOPPY
61 .bFlopCreateCnt:
62 .bFlopCntAndFirst resb 1 ; Normally, packed starting floppy drive number (high order 7 bits)
63 ; and number of drives (low order bit, max 2 drives supported).
64 ; During initialization, until the end of DetectDrives_FromAllIDEControllers,
65 ; this byte contains the raw number of floppy drives seen (using .bFlopCreateCnt)
66 %else
67 resb 1 ; alignment
68 %endif
69 .bXlatedDrv resb 1 ; Drive number after translation
70 .wFDandHDswap:
71 .bFDSwap resb 1 ; Floppy Drive to swap to 00h and vice versa
72 .bHDSwap resb 1 ; Hard Drive to swap to 80h and vice versa
73 endstruc
74%endif
75
76
77%ifdef MODULE_SERIAL_FLOPPY
78 %ifndef CHECK_FOR_UNUSED_ENTRYPOINTS
79 %if RAMVARS.xlateVars != RAMVARS.bDrvCnt+1 || XLATEVARS.bFlopCreateCnt != 0
80 %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"
81 %endif
82 %endif
83%endif
84
85RAMVARS_SIGNATURE EQU "Xu" ; RAMVARS signature for .wSignature
86
87;
88; IDEPACK NOTE: The first six bytes of this structure are directly put on the
89; wire for MODULE_SERIAL, please do not change the order or insert other members.
90;
91struc IDEPACK ; PIOVARS and MEMPIOVARS overwrite the first 7 bytes
92 .bFeatures resb 1
93 .bDrvAndHead resb 1 ; LBA28 27...24
94
95 .wSectorCountAndLbaLow:
96 .bSectorCount resb 1
97 .bSectorNumber:
98 .bLbaLow resb 1 ; LBA 7...0
99
100 .wCylinder:
101 .wLbaMiddleAndHigh:
102 .bLbaMiddle resb 1 ; LBA 15...8
103 .bLbaHigh resb 1 ; LBA 23...16
104
105 .bCommand resb 1
106 .bDeviceControl resb 1 ; Offset 7 shared with PIOVARS and MEMPIOVARS
107 resb 1 ; Used by PIOVARS and MEMPIOVARS
108
109%ifdef MODULE_EBIOS
110 ; Parameters for 48-bit LBA
111 .bLbaLowExt resb 1 ; LBA48 31...24
112 .wLbaMiddleAndHighExt:
113 .bLbaMiddleExt resb 1 ; LBA48 39...32
114 .bLbaHighExt resb 1 ; LBA48 47...40
115%endif
116
117 .intpack resb INTPACK_size
118endstruc
119
120SIZE_OF_IDEPACK_WITHOUT_INTPACK EQU (IDEPACK_size - INTPACK_size)
121
122
123%endif ; RAMVARS_INC
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