ReactOS 0.4.16-dev-753-g705a985
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 */