source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Inc/RamVars.inc @ 492

Last change on this file since 492 was 492, checked in by gregli@…, 11 years ago

Removed the dependency between MODULE_BOOT_MENU and MODULE_HOTKEYS. With these changes, 0, 1, or 2 of them can be included in a build. This change also means that the hotkeys don't work while the menu is up. But the most important hotkey there was for Rom Boot, and that has been added to the menu as a choice proper. Lots of changes across the board in the hotkeys code - even if we eventually back this change out (becaue, for example we want hotkeys to work in the menu) we should probably start from this base and add that functionality back in, as these changes results in approximately 120 bytes of savings and includes new functionality, such as the Rom Boot menu item and the Com Detect hotkey.

File size: 4.5 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%ifdef MODULE_SERIAL_FLOPPY
29    %define NEED_XLATEVARS
30%endif
31
32%ifdef MODULE_DRIVEXLATE
33    %define NEED_XLATEVARS
34%endif
35
36
37; RAM Variables.
38; Variables should be kept to minimum since they might be located
39; at the top of interrupt vectors.
40struc RAMVARS
41%ifdef RELOCATE_INT13H_STACK
42    .fpInt13hEntryStack resb    4
43    .dwStackChangeDSDI:
44    .wStackChangeDI     resb    2
45    .wStackChangeDS     resb    2
46    .wNewStackOffset    resb    2
47%endif
48    .wDrvDetectSignature:           ; Signature when BIOS is in drive detection mode
49    .fpOldI13h          resb    4   ; Far pointer to old INT 13h handler
50    .wSignature         resb    2   ; Sign for finding stolen 1...64 kiB
51    .bTimeoutTicksLeft  resb    1
52    .bLastTimeoutUpdate resb    1
53
54    .wFirstDrvAndCount:
55    .bFirstDrv          resb    1   ; Number of first drive for this BIOS
56    .wDrvCntAndFlopCnt:             ; Both the hard disk and floppy counts in one word
57                                    ; (yes, misaligned, but it is only used this way during initialization)
58    .bDrvCnt            resb    1   ; Number of drives handled by this BIOS
59
60    ; Variables for drive number translation
61%ifdef NEED_XLATEVARS
62    .xlateVars          resb    XLATEVARS_size
63%endif
64endstruc
65
66; Note!!! .wDrvDetectSignature and .wSignature are intentionally in different locations.
67RAMVARS_RAM_SIGNATURE           EQU "Xu"    ; RAMVARS signature for .wSignature
68RAMVARS_DRV_DETECT_SIGNATURE    EQU 5A5Ah   ; Signature when BIOS is in drive detection mode
69
70
71%ifdef NEED_XLATEVARS
72; Variables for translating drive numbers.
73    struc XLATEVARS
74    %ifdef MODULE_SERIAL_FLOPPY
75        .bFlopCreateCnt:
76        .bFlopCntAndFirst   resb    1   ; Normally, packed starting floppy drive number (high order 7 bits)
77                                        ; and number of drives (low order bit, max 2 drives supported).
78                                        ; During initialization, until the end of DetectDrives_FromAllIDEControllers,
79                                        ; this byte contains the raw number of floppy drives seen
80                                        ; (using .bFlopCreateCnt)
81    %else
82                            resb    1   ; alignment
83    %endif
84
85    %ifdef MODULE_DRIVEXLATE
86        .bXlatedDrv         resb    1   ; Drive number after translation
87        .wFDandHDswap:
88        .bFDSwap            resb    1   ; Floppy Drive to swap to 00h and vice versa
89        .bHDSwap            resb    1   ; Hard Drive to swap to 80h and vice versa
90    %else
91                            resb    1   ; alignment
92    %endif
93    endstruc
94%endif
95
96%ifdef MODULE_SERIAL_FLOPPY
97  %ifndef CHECK_FOR_UNUSED_ENTRYPOINTS
98    %if RAMVARS.xlateVars != RAMVARS.bDrvCnt+1 || XLATEVARS.bFlopCreateCnt != 0
99        %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"
100    %endif
101  %endif
102%endif
103
104
105
106;
107; IDEPACK NOTE: The first six bytes of this structure are directly put on the
108; wire for MODULE_SERIAL, please do not change the order or insert other members.
109;
110struc IDEPACK   ; PIOVARS and MEMPIOVARS overwrite the first 7 bytes
111    .bFeatures              resb    1
112    .bDrvAndHead            resb    1   ; LBA28 27...24
113
114    .wSectorCountAndLbaLow:
115    .bSectorCount           resb    1
116    .bSectorNumber:
117    .bLbaLow                resb    1   ; LBA 7...0
118
119    .wCylinder:
120    .wLbaMiddleAndHigh:
121    .bLbaMiddle             resb    1   ; LBA 15...8
122    .bLbaHigh               resb    1   ; LBA 23...16
123
124    .bCommand               resb    1
125    .bDeviceControl         resb    1   ; Offset 7 shared with PIOVARS and MEMPIOVARS
126                            resb    1   ; Used by PIOVARS and MEMPIOVARS
127
128%ifdef MODULE_EBIOS
129    ; Parameters for 48-bit LBA
130    .bLbaLowExt             resb    1   ; LBA48 31...24
131    .wLbaMiddleAndHighExt:
132    .bLbaMiddleExt          resb    1   ; LBA48 39...32
133    .bLbaHighExt            resb    1   ; LBA48 47...40
134%endif
135
136    .intpack                resb    INTPACK_size
137endstruc
138
139SIZE_OF_IDEPACK_WITHOUT_INTPACK     EQU (IDEPACK_size - INTPACK_size)
140
141
142%endif ; RAMVARS_INC
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