1 /* -*- linux-c -*- ------------------------------------------------------- *
4  *   Copyright 2007-2008 rPath, Inc. - All Rights Reserved
9  * ----------------------------------------------------------------------- */
12  * arch/i386/boot/video-mode.c
14  * Set the video mode.  This is separated out into a different
29 int do_restore;		/* Screen contents changed during mode flip */
30 int graphic_mode;	/* Graphic mode with linear frame buffer */
32 /* Probe the video drivers and have them generate their mode lists. */
44 		if (card->unsafe == unsafe) {  in probe_cards()
45 			if (card->probe)  in probe_cards()
46 				card->nmodes = card->probe();  in probe_cards()
48 				card->nmodes = 0;  in probe_cards()
53 /* Test if a mode is defined */
54 int mode_defined(u16 mode)  in mode_defined()  argument
61 		mi = card->modes;  in mode_defined()
62 		for (i = 0; i < card->nmodes; i++, mi++) {  in mode_defined()
63 			if (mi->mode == mode)  in mode_defined()
71 /* Set mode (without recalc) */
72 static int raw_set_mode(u16 mode, u16 *real_mode)  in raw_set_mode()  argument
79 	mode &= ~VIDEO_RECALC;  in raw_set_mode()
81 	/* Scan for mode based on fixed ID, position, or resolution */  in raw_set_mode()
84 		mi = card->modes;  in raw_set_mode()
85 		for (i = 0; i < card->nmodes; i++, mi++) {  in raw_set_mode()
86 			int visible = mi->x || mi->y;  in raw_set_mode()
88 			if ((mode == nmode && visible) ||  in raw_set_mode()
89 			    mode == mi->mode ||  in raw_set_mode()
90 			    mode == (mi->y << 8)+mi->x) {  in raw_set_mode()
91 				*real_mode = mi->mode;  in raw_set_mode()
92 				return card->set_mode(mi);  in raw_set_mode()
100 	/* Nothing found?  Is it an "exceptional" (unprobed) mode? */  in raw_set_mode()
102 		if (mode >= card->xmode_first &&  in raw_set_mode()
103 		    mode < card->xmode_first+card->xmode_n) {  in raw_set_mode()
105 			*real_mode = mix.mode = mode;  in raw_set_mode()
107 			return card->set_mode(&mix);  in raw_set_mode()
112 	return -1;  in raw_set_mode()
129 	rows--;			/* ... minus one */  in vga_recalc_vertical()
134 	pt &= ~0x80;		/* Unlock CR0-7 */  in vga_recalc_vertical()
141 	ov |= (rows >> (8-1)) & 0x02;  in vga_recalc_vertical()
142 	ov |= (rows >> (9-6)) & 0x40;  in vga_recalc_vertical()
146 /* Set mode (with recalc if specified) */
147 int set_mode(u16 mode)  in set_mode()  argument
152 	/* Very special mode numbers... */  in set_mode()
153 	if (mode == VIDEO_CURRENT_MODE)  in set_mode()
155 	else if (mode == NORMAL_VGA)  in set_mode()
156 		mode = VIDEO_80x25;  in set_mode()
157 	else if (mode == EXTENDED_VGA)  in set_mode()
158 		mode = VIDEO_8POINT;  in set_mode()
160 	rv = raw_set_mode(mode, &real_mode);  in set_mode()
164 	if (mode & VIDEO_RECALC)  in set_mode()
167 	/* Save the canonical mode number for the kernel, not  in set_mode()