ReactOS  0.4.13-dev-982-g9853eab
cmdcnst.h
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1 /*
2  * PROJECT: ReactOS VGA Miniport Driver
3  * LICENSE: Microsoft NT4 DDK Sample Code License
4  * PURPOSE: Command Code Definitions for VGA Command Streams
5  * PROGRAMMERS: Copyright (c) 1992 Microsoft Corporation
6  */
7 
8 #pragma once
9 
10 //--------------------------------------------------------------------------
11 // Definition of the set/clear mode command language.
12 //
13 // Each command is composed of a major portion and a minor portion.
14 // The major portion of a command can be found in the most significant
15 // nibble of a command byte, while the minor portion is in the least
16 // significant portion of a command byte.
17 //
18 // maj minor Description
19 // ---- ----- --------------------------------------------
20 // 00 End of data
21 //
22 // 10 in and out type commands as described by flags
23 // flags:
24 //
25 // xxxx
26 // ||||
27 // |||+-------- unused
28 // ||+--------- 0/1 single/multiple values to output (in's are always
29 // |+---------- 0/1 8/16 bit operation single)
30 // +----------- 0/1 out/in instruction
31 //
32 // Outs
33 // ----------------------------------------------
34 // 0 reg:W val:B
35 // 2 reg:W cnt:W val1:B val2:B...valN:B
36 // 4 reg:W val:W
37 // 6 reg:W cnt:W val1:W val2:W...valN:W
38 //
39 // Ins
40 // ----------------------------------------------
41 // 8 reg:W
42 // a reg:W cnt:W
43 // c reg:W
44 // e reg:W cnt:W
45 //
46 // 20 Special purpose outs
47 // 00 do indexed outs for seq, crtc, and gdc
48 // indexreg:W cnt:B startindex:B val1:B val2:B...valN:B
49 // 01 do indexed outs for atc
50 // index-data_reg:W cnt:B startindex:B val1:B val2:B...valN:B
51 // 02 do masked outs
52 // indexreg:W andmask:B xormask:B
53 //
54 // F0 Nop
55 //
56 //---------------------------------------------------------------------------
57 
58 // some useful equates - major commands
59 
60 #define EOD 0x000 // end of data
61 #define INOUT 0x010 // do ins or outs
62 #define METAOUT 0x020 // do special types of outs
63 #define NCMD 0x0f0 // Nop command
64 
65 
66 // flags for INOUT major command
67 
68 //#define UNUSED 0x01 // reserved
69 #define MULTI 0x02 // multiple or single outs
70 #define BW 0x04 // byte/word size of operation
71 #define IO 0x08 // out/in instruction
72 
73 // minor commands for METAOUT
74 
75 #define INDXOUT 0x00 // do indexed outs
76 #define ATCOUT 0x01 // do indexed outs for atc
77 #define MASKOUT 0x02 // do masked outs using and-xor masks
78 
79 
80 // composite INOUT type commands
81 
82 #define OB (INOUT) // output 8 bit value
83 #define OBM (INOUT+MULTI) // output multiple bytes
84 #define OW (INOUT+BW) // output single word value
85 #define OWM (INOUT+BW+MULTI) // output multiple words
86 
87 #define IB (INOUT+IO) // input byte
88 #define IBM (INOUT+IO+MULTI) // input multiple bytes
89 #define IW (INOUT+IO+BW) // input word
90 #define IWM (INOUT+IO+BW+MULTI) // input multiple words
91 
92 /* EOF */