1 | /*␊ |
2 | * edid.c␊ |
3 | * ␊ |
4 | *␊ |
5 | * Created by Evan Lojewski on 12/1/09.␊ |
6 | * Copyright 2009. All rights reserved.␊ |
7 | *␊ |
8 | */␊ |
9 | ␊ |
10 | ␊ |
11 | #include "edid.h"␊ |
12 | #include "vbe.h"␊ |
13 | #include "graphics.h"␊ |
14 | ␊ |
15 | ␊ |
16 | ␊ |
17 | void getResolution(UInt32* x, UInt32* y, UInt32* bp)␊ |
18 | {␊ |
19 | ␉static UInt32 xResolution, yResolution, bpResolution;␊ |
20 | ␊ |
21 | ␉bpResolution = 32;␉// assume 32bits␊ |
22 | ␉␊ |
23 | ␉if(!xResolution || !yResolution || !bpResolution)␊ |
24 | ␉{␊ |
25 | ␉␉␊ |
26 | ␉␉char* edidInfo = readEDID();␊ |
27 | ␉␉␊ |
28 | ␉␉if(!edidInfo) return;␊ |
29 | ␉␉␊ |
30 | ␉␉// TODO: check *all* resolutions reported and either use the highest, or the native resolution (if there is a flag for that)␊ |
31 | ␉␉xResolution = edidInfo[56] | ((edidInfo[58] & 0xF0) << 4);␊ |
32 | ␉␉yResolution = edidInfo[59] | ((edidInfo[61] & 0xF0) << 4);␊ |
33 | ␉␉␊ |
34 | ␉␉//printf("H Active = %d", edidInfo[56] | ((edidInfo[58] & 0xF0) << 4) );␊ |
35 | ␉␉//printf("V Active = %d", edidInfo[59] | ((edidInfo[61] & 0xF0) << 4) );␊ |
36 | ␉␉␊ |
37 | ␉␉free( edidInfo );␊ |
38 | ␉␉␊ |
39 | ␉␉if(!xResolution) xResolution = DEFAULT_SCREEN_WIDTH;␊ |
40 | ␉␉if(!yResolution) yResolution = DEFAULT_SCREEN_HEIGHT;␊ |
41 | ␊ |
42 | ␉}␊ |
43 | ␊ |
44 | ␉*x = xResolution;␊ |
45 | ␉*y = yResolution;␊ |
46 | ␉*bp = bpResolution;␊ |
47 | ␊ |
48 | }␊ |
49 | ␊ |
50 | char* readEDID()␊ |
51 | {␊ |
52 | ␉SInt16 last_reported = -1;␊ |
53 | ␉UInt8 edidInfo[EDID_BLOCK_SIZE];␊ |
54 | ␊ |
55 | ␉UInt8 header1[] = {0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00};␊ |
56 | ␉UInt8 header2[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};␊ |
57 | ␉␊ |
58 | ␉SInt16 status;␊ |
59 | ␉UInt16 blocks_left = 1;␊ |
60 | ␉␊ |
61 | ␉do␊ |
62 | ␉{␊ |
63 | ␉␉// TODO: This currently only retrieves the *last* block, make the block buffer expand as needed / calculated from the first block␊ |
64 | ␊ |
65 | ␉␉bzero( edidInfo, EDID_BLOCK_SIZE);␊ |
66 | ␊ |
67 | ␉␉status = getEDID(edidInfo, blocks_left);␊ |
68 | ␉␉␊ |
69 | ␉␉␊ |
70 | ␉␉//printf("Buffer location: 0x%X\n", SEG(buffer) << 16 | OFF(buffer));␊ |
71 | ␉␉/*␊ |
72 | ␉␉int j, i;␊ |
73 | ␉␉for (j = 0; j < 8; j++) {␊ |
74 | ␉␉␉for(i = 0; i < 16; i++) printf("0x%X ", ebiosInfo[((i+1) * (j + 1)) - 1]);␊ |
75 | ␊ |
76 | ␉␉}␊ |
77 | ␉␉printf("\n");␊ |
78 | ␉␉*/␊ |
79 | ␉␉␊ |
80 | ␉␉if(status == 0)␊ |
81 | ␉␉{␊ |
82 | ␉␉␉//if( edidInfo[0] == 0x00 || edidInfo[0] == 0xFF)␊ |
83 | ␉␉␉if((memcmp(edidInfo, header1, sizeof(header1)) != 0) ||␊ |
84 | ␉␉␉ (memcmp(edidInfo, header2, sizeof(header2)) != 0) )␊ |
85 | ␉␉␉{␊ |
86 | ␉␉␉␉blocks_left--;␊ |
87 | ␉␉␉␉int reported = edidInfo[ EDID_V1_BLOCKS_TO_GO_OFFSET ];␊ |
88 | ␉␉␉␉␊ |
89 | ␉␉␉␉if ( reported > blocks_left )␊ |
90 | ␉␉␉␉{␊ |
91 | ␉␉␉␉␉␊ |
92 | ␉␉␉␉␉printf("EDID claims %d more blocks left\n", reported);␊ |
93 | ␉␉␉␉}␊ |
94 | ␉␉␉␉␊ |
95 | ␉␉␉␉if ( (last_reported <= reported && last_reported != -1)␊ |
96 | ␉␉␉␉␉|| reported == 0xff␊ |
97 | ␉␉␉␉␉/* 0xff frequently comes up in corrupt edids */␊ |
98 | ␉␉␉␉␉//|| reported == MAGIC␊ |
99 | ␉␉␉␉␉)␊ |
100 | ␉␉␉␉{␊ |
101 | ␉␉␉␉␉printf("Last reported %d\n", last_reported);␊ |
102 | ␉␉␉␉␉printf( "EDID blocks left is wrong.\n"␊ |
103 | ␉␉␉␉␉␉ "Your EDID is probably invalid.\n");␊ |
104 | ␉␉␉␉␉return 0;␊ |
105 | ␉␉␉␉}␊ |
106 | ␉␉␉␉else␊ |
107 | ␉␉␉␉{␊ |
108 | ␉␉␉␉␉//printf("Reading EDID block\n");␊ |
109 | ␉␉␉␉␉//printf("H Active = %d", ebiosInfo[56] | ((ebiosInfo[58] & 0xF0) << 4) );␊ |
110 | ␉␉␉␉␉//printf("V Active = %d", ebiosInfo[59] | ((ebiosInfo[61] & 0xF0) << 4) );␊ |
111 | ␊ |
112 | ␉␉␉␉␉last_reported = reported;␊ |
113 | ␉␉␉␉␉blocks_left = reported;␊ |
114 | ␉␉␉␉}␊ |
115 | ␉␉␉} ␊ |
116 | ␉␉␉else␊ |
117 | ␉␉␉{␊ |
118 | ␉␉␉␉printf("Invalid block %d\n", blocks_left);␊ |
119 | ␉␉␉␉printf("Header1 = %d", memcmp(edidInfo, header1, sizeof(header1)) );␊ |
120 | ␉␉␉␉printf("Header2 = %d", memcmp(edidInfo, header2, sizeof(header2)) );␊ |
121 | ␉␉␉␉return 0;␊ |
122 | ␉␉␉}␊ |
123 | ␉␉}␊ |
124 | ␉␉blocks_left = 0;␉␊ |
125 | ␉} while(blocks_left);␊ |
126 | ␊ |
127 | ␉char* ret = malloc(sizeof(edidInfo));␊ |
128 | ␉memcpy(ret, edidInfo, sizeof(edidInfo));␊ |
129 | ␉return ret;␊ |
130 | }␊ |
131 | ␊ |
132 | ␊ |
133 | int getEDID( void * edidBlock, UInt8 block)␊ |
134 | {␊ |
135 | ␉biosBuf_t bb;␊ |
136 | ␉␊ |
137 | ␉bzero(&bb, sizeof(bb));␊ |
138 | bb.intno = 0x10;␊ |
139 | bb.eax.rr = 0x4F15;␊ |
140 | ␉bb.ebx.r.l= 0x01;␊ |
141 | ␉bb.edx.rr = block;␊ |
142 | ␉␊ |
143 | bb.es = SEG( edidBlock );␊ |
144 | bb.edi.rr = OFF( edidBlock );␊ |
145 | ␉␊ |
146 | bios( &bb );␊ |
147 | return(bb.eax.r.h);␊ |
148 | }␊ |
149 | ␊ |
150 | |