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/* 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.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "vbios.h"
#include "plugin.h"
extern struct plugin PLUGINS;
static struct plugin *plugins[] = { REF_PLUGINS };
#define nb_plugins ((int) (sizeof(plugins) / sizeof(struct plugin *)))
static struct vbios_mode *find_modes(int *bios_type) {
int i;
struct vbios_mode *modes;
unsigned char *p = bios;
while(p < (bios+VBIOS_SIZE-3*sizeof(struct vbios_mode))) {
modes = (struct vbios_mode *) p;
if(((modes[0].mode & 0xf0) == 0x30) && ((modes[1].mode & 0xf0) == 0x30) && ((modes[2].mode & 0xf0) == 0x30) && ((modes[3].mode & 0xf0) == 0x30)) {
if(*bios_type == -1) {
for(i=0; i<nb_plugins; i++) {
if(plugins[i]->detect_vbios_type(modes)) {
*bios_type = i;
break;
}
}
}
return modes;
}
p++;
}
return NULL;
}
static struct vbios_resolution *find_resolution(struct vbios_mode *modes, int mode) {
while(modes->mode != 0xff) {
if(modes->mode == mode) {
return VBIOS_POINTER(modes->resolution);
}
modes++;
}
return NULL;
}
static void list_modes(int vbios_type, struct vbios_mode *modes) {
unsigned int x, y;
while(modes->mode != 0xff) {
plugins[vbios_type]->get_resolution(VBIOS_POINTER(modes->resolution), &x, &y);
if((x != 0) && (y != 0)) {
printf("Mode %02x : %dx%d, %d bits/pixel\n", modes->mode, x, y, modes->bits_per_pixel);
}
modes++;
}
}
static int parse_args(int argc, char *argv[], int *list, int *bios_type, int *mode, int *x, int *y) {
int index = 1;
*list = *mode = *x = *y = 0;
*bios_type = -1;
if((argc > index) && !strcmp(argv[index], "-l")) {
*list = 1;
index++;
if(argc<=index) {
return 0;
}
}
if((argc > index) && !strcmp(argv[index], "-f")) {
index++;
*bios_type = atoi(argv[index])-1;
index++;
if((*bios_type)<0 || (*bios_type >= nb_plugins)) {
fprintf(stderr, "Unknown forced VBIOS type (must be <= %d)\n", nb_plugins);
return -1;
}
if(argc<=index) {
return 0;
}
}
if(argc-index != 3) {
return -1;
}
*mode = (int) strtol(argv[index], NULL, 16);
*x = atoi(argv[index+1]);
*y = atoi(argv[index+2]);
return 0;
}
static void usage(char *name) {
printf("Usage: %s [-l] [-f bios_type] [mode X Y]\n", name);
printf(" Set the resolution to XxY for mode\n");
printf(" Options:\n");
printf(" -l display the modes found into the vbios\n");
printf(" -f skip the VBIOS detection by forcing a VBIOS type\n");
}
int main (int argc, char *argv[]) {
unsigned char *vbios_cfg;
int vbios_type;
struct vbios_mode *modes;
void *resolution;
int list, mode, x, y;
printf("855resolution version %s, by Alain Poirier\n\n", VERSION);
if(parse_args(argc, argv, &list, &vbios_type, &mode, &x, &y) == -1)
{
usage(argv[0]);
return 2;
}
if(iopl(3) < 0) {
perror("Unable to obtain the proper IO permissions");
return 2;
}
display_chipset();
open_bios();
modes = find_modes(&vbios_type);
if(vbios_type == -1)
{
fprintf(stderr, "Unknow VBIOS structure\n");
close_bios();
return 2;
}
printf("VBIOS type: %d\n", vbios_type+1);
vbios_cfg = get_vbios_cfg();
if(vbios_cfg == NULL) {
fprintf(stderr, "Couldn't find the configuration area in the VBIOS!\n");
close_bios();
return 2;
}
printf("VBIOS Version: %.4s\n", plugins[vbios_type]->get_vbios_version(vbios_cfg));
if(modes == NULL)
{
fprintf(stderr, "Couldn't find the modes table in the VBIOS\n");
close_bios();
return 2;
}
putchar('\n');
if(list) {
list_modes(vbios_type, modes);
}
if(mode!=0 && x!=0 && y!=0)
{
resolution = find_resolution(modes, mode);
if(resolution == NULL)
{
fprintf(stderr, "Couldn't find the mode %02x into the modes table\n", mode);
close_bios();
return 2;
}
plugins[vbios_type]->set_resolution(resolution, x, y);
printf("** Patch mode %02x to resolution %dx%d complete\n", mode, x, y);
if(list) {
list_modes(vbios_type, modes);
}
}
close_bios();
return 0;
}
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