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Source at commit 148 created 13 years 11 months ago.
By meklort, 915resolution code
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#include "boot.h"␊
16 ␊
17void getResolution(UInt32* x, UInt32* y, UInt32* bp)␊
18{␊
19␉int val;␊
20␉static UInt32 xResolution, yResolution, bpResolution;␊
21␊
22␉if(getIntForKey(kScreenWidth, &val, &bootInfo->bootConfig))␊
23␉{␊
24␉␉xResolution = val;␊
25␉}␊
26␉␊
27␉if(getIntForKey(kScreenHeight, &val, &bootInfo->bootConfig))␊
28␉{␊
29␉␉yResolution = val;␊
30␉}␊
31␊
32␉bpResolution = 32;␉// assume 32bits␊
33␊
34␉␊
35␉if(!xResolution || !yResolution || !bpResolution)␊
36␉{␊
37␉␉␊
38␉␉char* edidInfo = readEDID();␊
39␉␉␊
40␉␉if(!edidInfo) return;␊
41␉␉␊
42␉␉// TODO: check *all* resolutions reported and either use the highest, or the native resolution (if there is a flag for that)␊
43␉␉xResolution = edidInfo[56] | ((edidInfo[58] & 0xF0) << 4);␊
44␉␉yResolution = edidInfo[59] | ((edidInfo[61] & 0xF0) << 4);␊
45␉␉␊
46␉␉//printf("H Active = %d", edidInfo[56] | ((edidInfo[58] & 0xF0) << 4) );␊
47␉␉//printf("V Active = %d", edidInfo[59] | ((edidInfo[61] & 0xF0) << 4) );␊
48␉␉␊
49␉␉␊
50␉␉␊
51␉␉␊
52␉␉free( edidInfo );␊
53␉␉␊
54␉␉if(!xResolution) xResolution = DEFAULT_SCREEN_WIDTH;␊
55␉␉if(!yResolution) yResolution = DEFAULT_SCREEN_HEIGHT;␊
56␊
57␉}␊
58␊
59␉*x = xResolution;␊
60␉*y = yResolution;␊
61␉*bp = bpResolution;␊
62␊
63}␊
64␊
65char* readEDID()␊
66{␊
67␉SInt16 last_reported = -1;␊
68␉UInt8 edidInfo[EDID_BLOCK_SIZE];␊
69␊
70␉UInt8 header1[] = {0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00};␊
71␉UInt8 header2[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};␊
72␉␊
73␉SInt16 status;␊
74␉UInt16 blocks_left = 1;␊
75␉␊
76␉do␊
77␉{␊
78␉␉// TODO: This currently only retrieves the *last* block, make the block buffer expand as needed / calculated from the first block␊
79␊
80␉␉bzero( edidInfo, EDID_BLOCK_SIZE);␊
81␊
82␉␉status = getEDID(edidInfo, blocks_left);␊
83␉␉␊
84␉␉␊
85␉␉//printf("Buffer location: 0x%X\n", SEG(buffer) << 16 | OFF(buffer));␊
86␉␉/*␊
87␉␉int j, i;␊
88␉␉for (j = 0; j < 8; j++) {␊
89␉␉␉for(i = 0; i < 16; i++) printf("0x%X ", ebiosInfo[((i+1) * (j + 1)) - 1]);␊
90␊
91␉␉}␊
92␉␉printf("\n");␊
93␉␉*/␊
94␉␉␊
95␉␉if(status == 0)␊
96␉␉{␊
97␉␉␉//if( edidInfo[0] == 0x00 || edidInfo[0] == 0xFF)␊
98␉␉␉if((memcmp(edidInfo, header1, sizeof(header1)) != 0) ||␊
99␉␉␉ (memcmp(edidInfo, header2, sizeof(header2)) != 0) )␊
100␉␉␉{␊
101␉␉␉␉blocks_left--;␊
102␉␉␉␉int reported = edidInfo[ EDID_V1_BLOCKS_TO_GO_OFFSET ];␊
103␉␉␉␉␊
104␉␉␉␉if ( reported > blocks_left )␊
105␉␉␉␉{␊
106␉␉␉␉␉␊
107␉␉␉␉␉printf("EDID claims %d more blocks left\n", reported);␊
108␉␉␉␉}␊
109␉␉␉␉␊
110␉␉␉␉if ( (last_reported <= reported && last_reported != -1)␊
111␉␉␉␉␉|| reported == 0xff␊
112␉␉␉␉␉/* 0xff frequently comes up in corrupt edids */␊
113␉␉␉␉␉//|| reported == MAGIC␊
114␉␉␉␉␉)␊
115␉␉␉␉{␊
116␉␉␉␉␉printf("Last reported %d\n", last_reported);␊
117␉␉␉␉␉printf( "EDID blocks left is wrong.\n"␊
118␉␉␉␉␉␉ "Your EDID is probably invalid.\n");␊
119␉␉␉␉␉return 0;␊
120␉␉␉␉}␊
121␉␉␉␉else␊
122␉␉␉␉{␊
123␉␉␉␉␉//printf("Reading EDID block\n");␊
124␉␉␉␉␉//printf("H Active = %d", ebiosInfo[56] | ((ebiosInfo[58] & 0xF0) << 4) );␊
125␉␉␉␉␉//printf("V Active = %d", ebiosInfo[59] | ((ebiosInfo[61] & 0xF0) << 4) );␊
126␊
127␉␉␉␉␉last_reported = reported;␊
128␉␉␉␉␉blocks_left = reported;␊
129␉␉␉␉}␊
130␉␉␉} ␊
131␉␉␉else␊
132␉␉␉{␊
133␉␉␉␉printf("Invalid block %d\n", blocks_left);␊
134␉␉␉␉printf("Header1 = %d", memcmp(edidInfo, header1, sizeof(header1)) );␊
135␉␉␉␉printf("Header2 = %d", memcmp(edidInfo, header2, sizeof(header2)) );␊
136␉␉␉␉return 0;␊
137␉␉␉}␊
138␉␉}␊
139␉␉blocks_left = 0;␉␊
140␉} while(blocks_left);␊
141␊
142␉char* ret = malloc(sizeof(edidInfo));␊
143␉memcpy(ret, edidInfo, sizeof(edidInfo));␊
144␉return ret;␊
145}␊
146

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