1 // SPDX-License-Identifier: GPL-2.0-only
2 /* -*- linux-c -*- ------------------------------------------------------- *
5  *   Copyright 2007 rPath, Inc. - All Rights Reserved
8  * ----------------------------------------------------------------------- */
11  * Standard video BIOS modes
17 #include "video.h"
21 /* Set a conventional BIOS mode */
22 static int set_bios_mode(u8 mode);
26 	return set_bios_mode(mi->mode - VIDEO_FIRST_BIOS);  in bios_set_mode()
29 static int set_bios_mode(u8 mode)  in set_bios_mode()  argument
35 	ireg.al = mode;		/* AH=0x00 Set Video Mode */  in set_bios_mode()
38 	ireg.ah = 0x0f;		/* Get Current Video Mode */  in set_bios_mode()
41 	do_restore = 1;		/* Assume video contents were lost */  in set_bios_mode()
46 	if (new_mode == mode)  in set_bios_mode()
47 		return 0;	/* Mode change OK */  in set_bios_mode()
51 		/* Mode setting failed, but we didn't end up where we  in set_bios_mode()
53 		   video mode. */  in set_bios_mode()
58 	return -1;  in set_bios_mode()
63 	u8 mode;  in bios_probe()  local
81 	for (mode = 0x14; mode <= 0x7f; mode++) {  in bios_probe()
85 		if (mode_defined(VIDEO_FIRST_BIOS+mode))  in bios_probe()
88 		if (set_bios_mode(mode))  in bios_probe()
91 		/* Try to verify that it's a text mode. */  in bios_probe()
106 		mi->mode = VIDEO_FIRST_BIOS+mode;  in bios_probe()
107 		mi->depth = 0;	/* text */  in bios_probe()
108 		mi->x = rdfs16(0x44a);  in bios_probe()
109 		mi->y = rdfs8(0x484)+1;  in bios_probe()