source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Inc/RamVars.inc @ 444

Last change on this file since 444 was 444, checked in by aitotat@…, 11 years ago

Changes to XTIDE Universal BIOS:

  • Added XT-CF transfer functions for 80188/80186 and later.
  • XT-CF drive detection timeouts are now the same as for other controllers.
File size: 4.3 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    .wDrvDetectSignature:           ; Signature when BIOS is in drive detection mode
40    .fpOldI13h          resb    4   ; Far pointer to old INT 13h handler
41    .wSignature         resb    2   ; Sign for finding stolen 1...64 kiB
42    .bTimeoutTicksLeft  resb    1
43    .bLastTimeoutUpdate resb    1
44
45    .wFirstDrvAndCount:
46    .bFirstDrv          resb    1   ; Number of first drive for this BIOS
47    .wDrvCntAndFlopCnt:             ; Both the hard disk and floppy counts in one word
48                                    ; (yes, misaligned, but it is only used this way during initialization)
49    .bDrvCnt            resb    1   ; Number of drives handled by this BIOS
50
51    ; Variables for drive number translation
52%ifdef MODULE_HOTKEYS
53    .xlateVars          resb    XLATEVARS_size
54%endif
55endstruc
56
57; Note!!! .wDrvDetectSignature and .wSignature are intentionally in different locations.
58RAMVARS_RAM_SIGNATURE           EQU "Xu"    ; RAMVARS signature for .wSignature
59RAMVARS_DRV_DETECT_SIGNATURE    EQU 5A5Ah   ; Signature when BIOS is in drive detection mode
60
61
62
63; Variables for translating drive numbers.
64%ifdef MODULE_HOTKEYS
65    struc XLATEVARS
66    %ifdef MODULE_SERIAL_FLOPPY
67        .bFlopCreateCnt:
68        .bFlopCntAndFirst   resb    1   ; Normally, packed starting floppy drive number (high order 7 bits)
69                                        ; and number of drives (low order bit, max 2 drives supported).
70                                        ; During initialization, until the end of DetectDrives_FromAllIDEControllers,
71                                        ; this byte contains the raw number of floppy drives seen (using .bFlopCreateCnt)
72    %else
73                            resb    1   ; alignment
74    %endif
75        .bXlatedDrv         resb    1   ; Drive number after translation
76        .wFDandHDswap:
77        .bFDSwap            resb    1   ; Floppy Drive to swap to 00h and vice versa
78        .bHDSwap            resb    1   ; Hard Drive to swap to 80h and vice versa
79    endstruc
80%endif
81
82
83%ifdef MODULE_SERIAL_FLOPPY
84  %ifndef CHECK_FOR_UNUSED_ENTRYPOINTS
85    %if RAMVARS.xlateVars != RAMVARS.bDrvCnt+1 || XLATEVARS.bFlopCreateCnt != 0
86        %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"
87    %endif
88  %endif
89%endif
90
91
92
93;
94; IDEPACK NOTE: The first six bytes of this structure are directly put on the
95; wire for MODULE_SERIAL, please do not change the order or insert other members.
96;
97struc IDEPACK   ; PIOVARS and MEMPIOVARS overwrite the first 7 bytes
98    .bFeatures              resb    1
99    .bDrvAndHead            resb    1   ; LBA28 27...24
100
101    .wSectorCountAndLbaLow:
102    .bSectorCount           resb    1
103    .bSectorNumber:
104    .bLbaLow                resb    1   ; LBA 7...0
105
106    .wCylinder:
107    .wLbaMiddleAndHigh:
108    .bLbaMiddle             resb    1   ; LBA 15...8
109    .bLbaHigh               resb    1   ; LBA 23...16
110
111    .bCommand               resb    1
112    .bDeviceControl         resb    1   ; Offset 7 shared with PIOVARS and MEMPIOVARS
113                            resb    1   ; Used by PIOVARS and MEMPIOVARS
114
115%ifdef MODULE_EBIOS
116    ; Parameters for 48-bit LBA
117    .bLbaLowExt             resb    1   ; LBA48 31...24
118    .wLbaMiddleAndHighExt:
119    .bLbaMiddleExt          resb    1   ; LBA48 39...32
120    .bLbaHighExt            resb    1   ; LBA48 47...40
121%endif
122
123    .intpack                resb    INTPACK_size
124endstruc
125
126SIZE_OF_IDEPACK_WITHOUT_INTPACK     EQU (IDEPACK_size - INTPACK_size)
127
128
129%endif ; RAMVARS_INC
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