diff options
Diffstat (limited to 'arch/i386/boot/video.c')
| -rw-r--r-- | arch/i386/boot/video.c | 467 |
1 files changed, 0 insertions, 467 deletions
diff --git a/arch/i386/boot/video.c b/arch/i386/boot/video.c deleted file mode 100644 index e4ba897bf9a..00000000000 --- a/arch/i386/boot/video.c +++ /dev/null @@ -1,467 +0,0 @@ -/* -*- linux-c -*- ------------------------------------------------------- * - * - * Copyright (C) 1991, 1992 Linus Torvalds - * Copyright 2007 rPath, Inc. - All Rights Reserved - * - * This file is part of the Linux kernel, and is made available under - * the terms of the GNU General Public License version 2. - * - * ----------------------------------------------------------------------- */ - -/* - * arch/i386/boot/video.c - * - * Select video mode - */ - -#include "boot.h" -#include "video.h" -#include "vesa.h" - -/* - * Mode list variables - */ -static struct card_info cards[]; /* List of cards to probe for */ - -/* - * Common variables - */ -int adapter; /* 0=CGA/MDA/HGC, 1=EGA, 2=VGA+ */ -u16 video_segment; -int force_x, force_y; /* Don't query the BIOS for cols/rows */ - -int do_restore = 0; /* Screen contents changed during mode flip */ -int graphic_mode; /* Graphic mode with linear frame buffer */ - -static void store_cursor_position(void) -{ - u16 curpos; - u16 ax, bx; - - ax = 0x0300; - bx = 0; - asm(INT10 - : "=d" (curpos), "+a" (ax), "+b" (bx) - : : "ecx", "esi", "edi"); - - boot_params.screen_info.orig_x = curpos; - boot_params.screen_info.orig_y = curpos >> 8; -} - -static void store_video_mode(void) -{ - u16 ax, page; - - /* N.B.: the saving of the video page here is a bit silly, - since we pretty much assume page 0 everywhere. */ - ax = 0x0f00; - asm(INT10 - : "+a" (ax), "=b" (page) - : : "ecx", "edx", "esi", "edi"); - - /* Not all BIOSes are clean with respect to the top bit */ - boot_params.screen_info.orig_video_mode = ax & 0x7f; - boot_params.screen_info.orig_video_page = page >> 8; -} - -/* - * Store the video mode parameters for later usage by the kernel. - * This is done by asking the BIOS except for the rows/columns - * parameters in the default 80x25 mode -- these are set directly, - * because some very obscure BIOSes supply insane values. - */ -static void store_mode_params(void) -{ - u16 font_size; - int x, y; - - /* For graphics mode, it is up to the mode-setting driver - (currently only video-vesa.c) to store the parameters */ - if (graphic_mode) - return; - - store_cursor_position(); - store_video_mode(); - - if (boot_params.screen_info.orig_video_mode == 0x07) { - /* MDA, HGC, or VGA in monochrome mode */ - video_segment = 0xb000; - } else { - /* CGA, EGA, VGA and so forth */ - video_segment = 0xb800; - } - - set_fs(0); - font_size = rdfs16(0x485); /* Font size, BIOS area */ - boot_params.screen_info.orig_video_points = font_size; - - x = rdfs16(0x44a); - y = (adapter == ADAPTER_CGA) ? 25 : rdfs8(0x484)+1; - - if (force_x) - x = force_x; - if (force_y) - y = force_y; - - boot_params.screen_info.orig_video_cols = x; - boot_params.screen_info.orig_video_lines = y; -} - -/* Probe the video drivers and have them generate their mode lists. */ -static void probe_cards(int unsafe) -{ - struct card_info *card; - static u8 probed[2]; - - if (probed[unsafe]) - return; - - probed[unsafe] = 1; - - for (card = video_cards; card < video_cards_end; card++) { - if (card->unsafe == unsafe) { - if (card->probe) - card->nmodes = card->probe(); - else - card->nmodes = 0; - } - } -} - -/* Test if a mode is defined */ -int mode_defined(u16 mode) -{ - struct card_info *card; - struct mode_info *mi; - int i; - - for (card = video_cards; card < video_cards_end; card++) { - mi = card->modes; - for (i = 0; i < card->nmodes; i++, mi++) { - if (mi->mode == mode) - return 1; - } - } - - return 0; -} - -/* Set mode (without recalc) */ -static int raw_set_mode(u16 mode, u16 *real_mode) -{ - int nmode, i; - struct card_info *card; - struct mode_info *mi; - - /* Drop the recalc bit if set */ - mode &= ~VIDEO_RECALC; - - /* Scan for mode based on fixed ID, position, or resolution */ - nmode = 0; - for (card = video_cards; card < video_cards_end; card++) { - mi = card->modes; - for (i = 0; i < card->nmodes; i++, mi++) { - int visible = mi->x || mi->y; - - if ((mode == nmode && visible) || - mode == mi->mode || - mode == (mi->y << 8)+mi->x) { - *real_mode = mi->mode; - return card->set_mode(mi); - } - - if (visible) - nmode++; - } - } - - /* Nothing found? Is it an "exceptional" (unprobed) mode? */ - for (card = video_cards; card < video_cards_end; card++) { - if (mode >= card->xmode_first && - mode < card->xmode_first+card->xmode_n) { - struct mode_info mix; - *real_mode = mix.mode = mode; - mix.x = mix.y = 0; - return card->set_mode(&mix); - } - } - - /* Otherwise, failure... */ - return -1; -} - -/* - * Recalculate the vertical video cutoff (hack!) - */ -static void vga_recalc_vertical(void) -{ - unsigned int font_size, rows; - u16 crtc; - u8 pt, ov; - - set_fs(0); - font_size = rdfs8(0x485); /* BIOS: font size (pixels) */ - rows = force_y ? force_y : rdfs8(0x484)+1; /* Text rows */ - - rows *= font_size; /* Visible scan lines */ - rows--; /* ... minus one */ - - crtc = vga_crtc(); - - pt = in_idx(crtc, 0x11); - pt &= ~0x80; /* Unlock CR0-7 */ - out_idx(pt, crtc, 0x11); - - out_idx((u8)rows, crtc, 0x12); /* Lower height register */ - - ov = in_idx(crtc, 0x07); /* Overflow register */ - ov &= 0xbd; - ov |= (rows >> (8-1)) & 0x02; - ov |= (rows >> (9-6)) & 0x40; - out_idx(ov, crtc, 0x07); -} - -/* Set mode (with recalc if specified) */ -static int set_mode(u16 mode) -{ - int rv; - u16 real_mode; - - /* Very special mode numbers... */ - if (mode == VIDEO_CURRENT_MODE) - return 0; /* Nothing to do... */ - else if (mode == NORMAL_VGA) - mode = VIDEO_80x25; - else if (mode == EXTENDED_VGA) - mode = VIDEO_8POINT; - - rv = raw_set_mode(mode, &real_mode); - if (rv) - return rv; - - if (mode & VIDEO_RECALC) - vga_recalc_vertical(); - - /* Save the canonical mode number for the kernel, not - an alias, size specification or menu position */ - boot_params.hdr.vid_mode = real_mode; - return 0; -} - -static unsigned int get_entry(void) -{ - char entry_buf[4]; - int i, len = 0; - int key; - unsigned int v; - - do { - key = getchar(); - - if (key == '\b') { - if (len > 0) { - puts("\b \b"); - len--; - } - } else if ((key >= '0' && key <= '9') || - (key >= 'A' && key <= 'Z') || - (key >= 'a' && key <= 'z')) { - if (len < sizeof entry_buf) { - entry_buf[len++] = key; - putchar(key); - } - } - } while (key != '\r'); - putchar('\n'); - - if (len == 0) - return VIDEO_CURRENT_MODE; /* Default */ - - v = 0; - for (i = 0; i < len; i++) { - v <<= 4; - key = entry_buf[i] | 0x20; - v += (key > '9') ? key-'a'+10 : key-'0'; - } - - return v; -} - -static void display_menu(void) -{ - struct card_info *card; - struct mode_info *mi; - char ch; - int i; - - puts("Mode: COLSxROWS:\n"); - - ch = '0'; - for (card = video_cards; card < video_cards_end; card++) { - mi = card->modes; - for (i = 0; i < card->nmodes; i++, mi++) { - int visible = mi->x && mi->y; - u16 mode_id = mi->mode ? mi->mode : - (mi->y << 8)+mi->x; - - if (!visible) - continue; /* Hidden mode */ - - printf("%c %04X %3dx%-3d %s\n", - ch, mode_id, mi->x, mi->y, card->card_name); - - if (ch == '9') - ch = 'a'; - else if (ch == 'z' || ch == ' ') - ch = ' '; /* Out of keys... */ - else - ch++; - } - } -} - -#define H(x) ((x)-'a'+10) -#define SCAN ((H('s')<<12)+(H('c')<<8)+(H('a')<<4)+H('n')) - -static unsigned int mode_menu(void) -{ - int key; - unsigned int sel; - - puts("Press <ENTER> to see video modes available, " - "<SPACE> to continue, or wait 30 sec\n"); - - kbd_flush(); - while (1) { - key = getchar_timeout(); - if (key == ' ' || key == 0) - return VIDEO_CURRENT_MODE; /* Default */ - if (key == '\r') - break; - putchar('\a'); /* Beep! */ - } - - - for (;;) { - display_menu(); - - puts("Enter a video mode or \"scan\" to scan for " - "additional modes: "); - sel = get_entry(); - if (sel != SCAN) - return sel; - - probe_cards(1); - } -} - -#ifdef CONFIG_VIDEO_RETAIN -/* Save screen content to the heap */ -struct saved_screen { - int x, y; - int curx, cury; - u16 *data; -} saved; - -static void save_screen(void) -{ - /* Should be called after store_mode_params() */ - saved.x = boot_params.screen_info.orig_video_cols; - saved.y = boot_params.screen_info.orig_video_lines; - saved.curx = boot_params.screen_info.orig_x; - saved.cury = boot_params.screen_info.orig_y; - - if (heap_free() < saved.x*saved.y*sizeof(u16)+512) - return; /* Not enough heap to save the screen */ - - saved.data = GET_HEAP(u16, saved.x*saved.y); - - set_fs(video_segment); - copy_from_fs(saved.data, 0, saved.x*saved.y*sizeof(u16)); -} - -static void restore_screen(void) -{ - /* Should be called after store_mode_params() */ - int xs = boot_params.screen_info.orig_video_cols; - int ys = boot_params.screen_info.orig_video_lines; - int y; - addr_t dst = 0; - u16 *src = saved.data; - u16 ax, bx, dx; - - if (graphic_mode) - return; /* Can't restore onto a graphic mode */ - - if (!src) - return; /* No saved screen contents */ - - /* Restore screen contents */ - - set_fs(video_segment); - for (y = 0; y < ys; y++) { - int npad; - - if (y < saved.y) { - int copy = (xs < saved.x) ? xs : saved.x; - copy_to_fs(dst, src, copy*sizeof(u16)); - dst += copy*sizeof(u16); - src += saved.x; - npad = (xs < saved.x) ? 0 : xs-saved.x; - } else { - npad = xs; - } - - /* Writes "npad" blank characters to - video_segment:dst and advances dst */ - asm volatile("pushw %%es ; " - "movw %2,%%es ; " - "shrw %%cx ; " - "jnc 1f ; " - "stosw \n\t" - "1: rep;stosl ; " - "popw %%es" - : "+D" (dst), "+c" (npad) - : "bdS" (video_segment), - "a" (0x07200720)); - } - - /* Restore cursor position */ - ax = 0x0200; /* Set cursor position */ - bx = 0; /* Page number (<< 8) */ - dx = (saved.cury << 8)+saved.curx; - asm volatile(INT10 - : "+a" (ax), "+b" (bx), "+d" (dx) - : : "ecx", "esi", "edi"); -} -#else -#define save_screen() ((void)0) -#define restore_screen() ((void)0) -#endif - -void set_video(void) -{ - u16 mode = boot_params.hdr.vid_mode; - - RESET_HEAP(); - - store_mode_params(); - save_screen(); - probe_cards(0); - - for (;;) { - if (mode == ASK_VGA) - mode = mode_menu(); - - if (!set_mode(mode)) - break; - - printf("Undefined video mode number: %x\n", mode); - mode = ASK_VGA; - } - vesa_store_edid(); - store_mode_params(); - - if (do_restore) - restore_screen(); -} |