1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
/* 855resolution by Alain Poirier
*
* Currently only tested on a Dell 510m with BIOS A04
* *VERY* likely that this won't work yet on any
* other versions or chipsets!!!
*
* This code is based on the techniques used in :
*
* - 855patch. Many thanks to Christian Zietz (czietz gmx net)
* for demonstrating how to shadow the VBIOS into system RAM
* and then modify it.
*
* - 1280patch by Andrew Tipton (andrewtipton null li).
*
* This source code is into the public domain.
*/
/* VBIOS as found on the Dell 510m */
#include <stdio.h>
#include <sys/io.h>
#include "../plugin.h"
struct vbios_resolution {
unsigned char unknow1[2];
unsigned char x1;
unsigned char unknow2;
unsigned char x2;
unsigned char y1;
unsigned char unknow3;
unsigned char y2;
} __attribute__((packed));
static void unlock_bios(void) {
outl(0x8000005a, 0xcf8);
outb(0x33, 0xcfe);
}
static void relock_bios(void) {
outl(0x8000005a, 0xcf8);
outb(0x11, 0xcfe);
}
static int detect_vbios_type(struct vbios_mode *modes) {
short int r1, r2;
float f;
r1 = r2 = 32000;
while(modes->mode != 0xff) {
if(modes->resolution <= r1) {
r1 = modes->resolution;
} else {
if(modes->resolution <= r2) {
r2 = modes->resolution;
}
}
modes++;
}
f = ((float) (r2-r1-6)) / sizeof(struct vbios_resolution);
return f == (int) f;
}
static unsigned char *get_vbios_version(unsigned char *vbios_cfg) {
return vbios_cfg+31;
}
static void get_resolution(struct vbios_resolution *resolution, unsigned int *x, unsigned int *y) {
*x = ((((unsigned int) resolution->x2) & 0xf0) << 4) | resolution->x1;
*y = ((((unsigned int) resolution->y2) & 0xf0) << 4) | resolution->y1;
}
static void set_resolution(struct vbios_resolution *resolution, unsigned int x, unsigned int y) {
unlock_bios();
resolution->x2 = (resolution->x2 & 0x0f) | ((x >> 4) & 0xf0);
resolution->x1 = (x & 0xff);
resolution->y2 = (resolution->y2 & 0x0f) | ((y >> 4) & 0xf0);
resolution->y1 = (y & 0xff);
relock_bios();
}
struct plugin plugin2 = {
detect_vbios_type,
get_vbios_version,
(get_resolution_type) get_resolution,
(set_resolution_type) set_resolution
};
|
