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Root/branches/diebuche/i386/libsaio/edid.c

Source at commit 113 created 14 years 2 months ago.
By diebuche, working on ati res.
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 "libsaio.h"␊
12#include "edid.h"␊
13#include "vbe.h"␊
14//#include "graphics.h"␊
15␊
16static biosBuf_t bb;␊
17␊
18UInt32 xResolution = 0;␊
19UInt32 yResolution = 0;␊
20UInt32 bpResolution = 0;␊
21␊
22void getResolution(UInt32* x, UInt32* y, UInt32* bp)␊
23{␊
24␉if(!xResolution && !yResolution && !bpResolution)␊
25␉{␊
26␉␉␊
27␉␉char* edidInfo = readEDID();␊
28␉␉␊
29␉␉if(!edidInfo) return;␊
30␉␉␊
31␉␉// TODO: check *all* resolutions reported and eithe ruse the highest, or the native resolution (if there is a flag for that)␊
32␉␉xResolution = edidInfo[56] | ((edidInfo[58] & 0xF0) << 4);␊
33␉␉yResolution = edidInfo[59] | ((edidInfo[61] & 0xF0) << 4); //1050␊
34␉␉␊
35␉␉␊
36␉␉printf("EDID from 56 = %d \n", edidInfo[56]);␊
37␉␉printf("EDID from 56 = %d \n", edidInfo[57]);␊
38␉␉printf("EDID from 56 = %d \n", edidInfo[58]);␊
39␉␉printf("EDID from 56 = %d \n", edidInfo[59]);␊
40␉␉printf("EDID from 56 = %d \n", edidInfo[60]);␊
41␉␉printf("EDID from 56 = %d \n", edidInfo[61]);␊
42␉␉printf("EDID from 56 = %d \n", edidInfo[62]);␊
43␉␉␉␉␉␉␉␉␉␉␉␉ ␊
44␉␉␊
45␉␉printf("H Active = %d \n", edidInfo[56] | ((edidInfo[58] & 0xF0) << 4) );␊
46␉␉printf("H Active = %d \n", edidInfo[57] | ((edidInfo[58] & 0xF0) << 4) );␊
47␉␉printf("H Active = %d \n", edidInfo[57] | ((edidInfo[59] & 0xF0) << 4) );␊
48␉␉printf("H Active = %d \n", edidInfo[55] | ((edidInfo[57] & 0xF0) << 4) );␊
49␉␉␊
50␉␉printf("V Active = %d \n", edidInfo[59] | ((edidInfo[61] & 0xF0) << 4) );␊
51␉␉␊
52␉␉␊
53␉␉bpResolution = 32;␉// assume 32bits␊
54␉␉␊
55␉␉␊
56␉␉free( edidInfo );␊
57␉␉␊
58␉␉if(!xResolution) xResolution = 1024; //DEFAULT_SCREEN_WIDTH;␊
59␉␉if(!yResolution) yResolution = 768; //DEFAULT_SCREEN_HEIGTH;␊
60␊
61␉}␊
62␊
63␉*x = xResolution;␊
64␉*y = yResolution;␊
65␉*bp = bpResolution;␊
66␊
67}␊
68␊
69char* readEDID()␊
70{␊
71␉SInt16 last_reported = -1;␊
72␉UInt8 edidInfo[EDID_BLOCK_SIZE];␊
73␊
74␉UInt8 pointer;␊
75␊
76␉UInt8 header1[] = {0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00};␊
77␉UInt8 header2[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};␊
78␉␊
79␉int status;␊
80␉unsigned int blocks_left = 1;␊
81␉␊
82␉do␊
83␉{␊
84␉␉// TODO: This currently only retrieves the *last* block, make the block buffer expand as needed / calculated from the first block␊
85␊
86␉␉bzero( edidInfo, EDID_BLOCK_SIZE);␊
87␊
88␉␉status = getEDID(edidInfo, blocks_left);␊
89␉␉␊
90␉␉␉␉//printf("Buffer location: 0x%X\n", SEG(buffer) << 16 | OFF(buffer));␊
91␊
92␉␉/*␊
93␉␉int j, i;␊
94␉␉for (j = 0; j < 8; j++) {␊
95␉␉␉for(i = 0; i < 16; i++) printf("0x%X ", ebiosInfo[((i+1) * (j + 1)) - 1]);␊
96␊
97␉␉}␊
98␉␉printf("\n");␊
99␉␉*/␊
100␉␉␊
101␉␉if(status == 0)␊
102␉␉{␊
103␉␉␉//if( edidInfo[0] == 0x00 || edidInfo[0] == 0xFF)␊
104␉␉␉if((memcmp(edidInfo, header1, sizeof(header1)) != 0) ||␊
105␉␉␉ (memcmp(edidInfo, header2, sizeof(header2)) != 0) )␊
106␉␉␉{␊
107␉␉␉␉blocks_left--;␊
108␉␉␉␉int reported = edidInfo[ EDID_V1_BLOCKS_TO_GO_OFFSET ];␊
109␉␉␉␉␊
110␉␉␉␉if ( reported > blocks_left )␊
111␉␉␉␉{␊
112␉␉␉␉␉␊
113␉␉␉␉␉printf("EDID claims %d more blocks left\n", reported);␊
114␉␉␉␉}␊
115␉␉␉␉␊
116␉␉␉␉if ( (last_reported <= reported && last_reported != -1)␊
117␉␉␉␉␉|| reported == 0xff␊
118␉␉␉␉␉/* 0xff frequently comes up in corrupt edids */␊
119␉␉␉␉␉//|| reported == MAGIC␊
120␉␉␉␉␉)␊
121␉␉␉␉{␊
122␉␉␉␉␉printf("Last reported %d\n", last_reported);␊
123␉␉␉␉␉printf( "EDID blocks left is wrong.\n"␊
124␉␉␉␉␉␉ "Your EDID is probably invalid.\n");␊
125␉␉␉␉␉return 0;␊
126␉␉␉␉}␊
127␉␉␉␉else␊
128␉␉␉␉{␊
129␉␉␉␉␉//printf("Reading EDID block\n");␊
130␉␉␉␉␉//printf("H Active = %d", ebiosInfo[56] | ((ebiosInfo[58] & 0xF0) << 4) );␊
131␉␉␉␉␉//printf("V Active = %d", ebiosInfo[59] | ((ebiosInfo[61] & 0xF0) << 4) );␊
132␊
133␉␉␉␉␉last_reported = reported;␊
134␉␉␉␉␉blocks_left = reported;␊
135␉␉␉␉}␊
136␉␉␉} ␊
137␉␉␉else␊
138␉␉␉{␊
139␉␉␉␉printf("Invalid block %d\n", blocks_left);␊
140␉␉␉␉printf("Header1 = %d", memcmp(edidInfo, header1, sizeof(header1)) );␊
141␉␉␉␉printf("Header2 = %d", memcmp(edidInfo, header2, sizeof(header2)) );␊
142␉␉␉␉return 0;␊
143␉␉␉}␊
144␉␉}␊
145␉␉blocks_left = 0;␉␊
146␉} while(blocks_left);␊
147␊
148␉UInt8* ret = malloc(sizeof(edidInfo));␊
149␉memcpy(ret, edidInfo, sizeof(edidInfo));␊
150␉return ret;␊
151}␊
152

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