桌面应用——宽屏笔记本，915GM芯片组，Linux的设置

为宽屏的分辩率率一和普通屏的不一样，如：1280*768，一些厂家的linux还不支持这些非传统标准的分辨率！ 这几天天天在老外的论坛里转，终于第一时间看到for 915GM的video BIOS修改程序，可以直接修改内存里有mode line叁数，让系统支持宽屏显示！ 另也找到了，最新的915GM的驱动，经过第三方修改的（奇怪的是Intel提供的不能正常工作，第三方的倒是可以，有了它才能真正发挥915GM的显示能力啊，那个vesa的驱动，太慢了，呵呵） 因这里不好上传附件，只能把原码贴上来了，是那个支持宽屏的修正程序，自己编译一下，如下： #gcc 915resolution.c -o 915resolution 然后运行 915resolution 5c 1280*768 然后写一脚本，让系统每次启动自动运行！呵呵！ 915GM的驱动，大了点，不好贴上来，需要的朋友加我QQ，传给你！ #include #include #include #define __USE_GNU #include #include #include #include #include #include #define NEW(a) ((a *)(calloc(1, sizeof(a)))) #define FREE(a) (free(a)) #define VBIOS_START 0xc0000 #define VBIOS_SIZE 0x10000 #define VBIOS_FILE "/dev/mem" #define VBIOS_OFFSET_IN_FILE VBIOS_START #define CFG_SIGNATURE "BIOS_DATA_BLOCK " #define FALSE 0 #define TRUE 1 typedef unsigned char * address; typedef unsigned char boolean;
typedef struct { unsigned char mode; unsigned char bits_per_pixel; unsigned short resolution; unsigned char unknown; } __attribute__((packed)) vbios_mode; typedef struct { unsigned char unknow1[2]; unsigned char x1; unsigned char unknow2; unsigned char x2; unsigned char y1; unsigned char unknow3; unsigned char y2; } __attribute__((packed)) vbios_resolution; typedef struct { int bios_fd; address bios_ptr; address cnfg_ptr; vbios_mode * mode_table; int mode_table_size; boolean unlocked; } vbios_map; void initialize_system(); char * get_chipset(void); vbios_map * open_vbios(); void close_vbios(vbios_map * map); void unlock_vbios(vbios_map * map); void relock_vbios(vbios_map * map); void initialize_system(void) { if (iopl(3) < 0) { perror("Unable to obtain the proper IO permissions"); exit(2); } } static unsigned int get_chipset_id(void) { outl(0x80000000, 0xcf8); return inl(0xcfc); } static char chipset_buffer[256]; char * get_chipset(void) { unsigned int id; char * name; id = get_chipset_id(); switch (id) { case 0x25608086: name = "845G"; break; case 0x35808086: name = "855GM"; break; case 0x25708086: name = "865G"; break; case 0x25908086: name = "915GM"; break; default: sprintf(chipset_buffer, "Unknown (0x%08x)", id); name = chipset_buffer; break; } return name; } vbios_map * open_vbios() { vbios_map * map = NEW(vbios_map); /* * Map the video bios to memory */ map->bios_fd = open(VBIOS_FILE, O_RDWR); if(map->bios_fd < 0) { perror("Unable to open the BIOS file"); exit(2); } map->bios_ptr = mmap((void *)VBIOS_START, VBIOS_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED, map->bios_fd, VBIOS_OFFSET_IN_FILE); if (map->bios_ptr == NULL) { fprintf(stderr, "Cannot mmap() the video BIOS\n"); close(map->bios_fd); exit(2); } /* * figure out where the configuration information is */ map->cnfg_ptr = memmem(map->bios_ptr, VBIOS_SIZE, CFG_SIGNATURE, strlen(CFG_SIGNATURE)); if (map->cnfg_ptr == NULL) { fprintf(stderr, "Couldn't find the configuration area in the VBIOS!\n"); close_vbios(map); exit(2); } /* * Figure out where the mode table is and which type of bios we have */ { address p = map->bios_ptr; address limit = map->bios_ptr + VBIOS_SIZE - (3 * sizeof(vbios_mode)); while (p < limit && map->mode_table == 0) { vbios_mode * mode_ptr = (vbios_mode *) p; if (((mode_ptr[0].mode & 0xf0) == 0x30) && ((mode_ptr[1].mode & 0xf0) == 0x30) && ((mode_ptr[2].mode & 0xf0) == 0x30) && ((mode_ptr[3].mode & 0xf0) == 0x30)) { map->mode_table = mode_ptr; } p++; } if (map->mode_table == 0) { fprintf(stderr, "Unable to locate mode table!\n"); close_vbios(map); exit(2); } } /* * Determine size of mode table */ { vbios_mode * mode_ptr = map->mode_table; while (mode_ptr->mode != 0xff) { map->mode_table_size++; mode_ptr++; } } return map; } void close_vbios(vbios_map * map) { assert(!map->unlocked); if(map->bios_ptr == NULL) { fprintf(stderr, "BIOS should be open already!\n"); exit(2); } munmap(map->bios_ptr, VBIOS_SIZE); close(map->bios_fd); FREE(map); } void unlock_vbios(vbios_map * map) { assert(!map->unlocked); map->unlocked = TRUE; outl(0x80000090, 0xcf8); #if DEBUG { unsigned int t = inl(0xcfc); printf("unlock PAM: (0x%08x)\n", t); } #endif outb(0x33, 0xcfd); outb(0x33, 0xcfe); #if DEBUG { unsigned int t = inl(0xcfc); printf("unlock PAM: (0x%08x)\n", t); } #endif } void relock_vbios(vbios_map * map) { assert(map->unlocked); map->unlocked = FALSE; outl(0x80000090, 0xcf8); #if DEBUG { unsigned int t = inl(0xcfc); printf("relock PAM: (0x%08x)\n", t); } #endif outb(0x11, 0xcfd); outb(0x11, 0xcfe); #if DEBUG { unsigned int t = inl(0xcfc); printf("relock PAM: (0x%08x)\n", t); } #endif } vbios_resolution * map_resolution(vbios_map * map, unsigned short res) { vbios_resolution * ptr = ((vbios_resolution*)(map->bios_ptr + res)); return ptr; } void list_modes(vbios_map *map) { unsigned int i, x, y; for (i=0; i < map->mode_table_size; i++) { vbios_resolution * res = map_resolution(map, map->mode_table[i].resolution); x = ((((unsigned int) res->x2) & 0xf0) << 4) | res->x1; y = ((((unsigned int) res->y2) & 0xf0) << 4) | res->y1; if (x != 0 && y != 0) { printf("Mode %02x : %dx%d, %d bits/pixel\n", map->mode_table[i].mode, x, y, map->mode_table[i].bits_per_pixel); } } } void set_mode(vbios_map * map, unsigned int mode, unsigned int x, unsigned int y) { unsigned int i; for (i=0; i < map->mode_table_size; i++) { if (map->mode_table[i].mode == mode) { vbios_resolution * res = map_resolution(map, map->mode_table[i].resolution); res->x2 = (res->x2 & 0x0f) | ((x >> 4) & 0xf0); res->x1 = (x & 0xff); res->y2 = (res->y2 & 0x0f) | ((y >> 4) & 0xf0); res->y1 = (y & 0xff); } } } int parse_args(int argc, char *argv[], int *list, int *mode, int *x, int *y) { int index = 1; *list = *mode = *x = *y = 0; if ((argc > index) && !strcmp(argv[index], "-l")) { *list = 1; index++; 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; } void usage(char *name) { printf("Usage: %s [-l] [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"); } int main (int argc, char *argv[]) { vbios_map * map; char * chipset; int list, mode, x, y; printf("Intel 915GM VBIOS Hack : version 0.1\n\n"); if (parse_args(argc, argv, &list, &mode, &x, &y) == -1) { usage(argv[0]); return 2; } initialize_system(); chipset = get_chipset(); printf("Chipset: %s\n", chipset); map = open_vbios(); printf("\n"); if (list) { list_modes(map); } if (mode!=0 && x!=0 && y!=0) { unlock_vbios(map); set_mode(map, mode, x, y); relock_vbios(map); printf("** Patch mode %02x to resolution %dx%d complete\n", mode, x, y); if (list) { list_modes(map); } } close_vbios(map); return 0; }