cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

fb_cmdline.c (2407B)

      1/*
      2 *  linux/drivers/video/fb_cmdline.c
      3 *
      4 *  Copyright (C) 2014 Intel Corp
      5 *  Copyright (C) 1994 Martin Schaller
      6 *
      7 *	2001 - Documented with DocBook
      8 *	- Brad Douglas <brad@neruo.com>
      9 *
     10 * This file is subject to the terms and conditions of the GNU General Public
     11 * License.  See the file COPYING in the main directory of this archive
     12 * for more details.
     13 *
     14 * Authors:
     15 *    Vetter <danie.vetter@ffwll.ch>
     16 */
     17#include <linux/init.h>
     18#include <linux/fb.h>
     19
     20static char *video_options[FB_MAX] __read_mostly;
     21static int ofonly __read_mostly;
     22
     23const char *fb_mode_option;
     24EXPORT_SYMBOL_GPL(fb_mode_option);
     25
     26/**
     27 * fb_get_options - get kernel boot parameters
     28 * @name:   framebuffer name as it would appear in
     29 *          the boot parameter line
     30 *          (video=<name>:<options>)
     31 * @option: the option will be stored here
     32 *
     33 * NOTE: Needed to maintain backwards compatibility
     34 */
     35int fb_get_options(const char *name, char **option)
     36{
     37	char *opt, *options = NULL;
     38	int retval = 0;
     39	int name_len = strlen(name), i;
     40
     41	if (name_len && ofonly && strncmp(name, "offb", 4))
     42		retval = 1;
     43
     44	if (name_len && !retval) {
     45		for (i = 0; i < FB_MAX; i++) {
     46			if (video_options[i] == NULL)
     47				continue;
     48			if (!video_options[i][0])
     49				continue;
     50			opt = video_options[i];
     51			if (!strncmp(name, opt, name_len) &&
     52			    opt[name_len] == ':')
     53				options = opt + name_len + 1;
     54		}
     55	}
     56	/* No match, pass global option */
     57	if (!options && option && fb_mode_option)
     58		options = kstrdup(fb_mode_option, GFP_KERNEL);
     59	if (options && !strncmp(options, "off", 3))
     60		retval = 1;
     61
     62	if (option)
     63		*option = options;
     64
     65	return retval;
     66}
     67EXPORT_SYMBOL(fb_get_options);
     68
     69/**
     70 *	video_setup - process command line options
     71 *	@options: string of options
     72 *
     73 *	Process command line options for frame buffer subsystem.
     74 *
     75 *	NOTE: This function is a __setup and __init function.
     76 *            It only stores the options.  Drivers have to call
     77 *            fb_get_options() as necessary.
     78 */
     79static int __init video_setup(char *options)
     80{
     81	if (!options || !*options)
     82		goto out;
     83
     84	if (!strncmp(options, "ofonly", 6)) {
     85		ofonly = 1;
     86		goto out;
     87	}
     88
     89	if (strchr(options, ':')) {
     90		/* named */
     91		int i;
     92
     93		for (i = 0; i < FB_MAX; i++) {
     94			if (video_options[i] == NULL) {
     95				video_options[i] = options;
     96				break;
     97			}
     98		}
     99	} else {
    100		/* global */
    101		fb_mode_option = options;
    102	}
    103
    104out:
    105	return 1;
    106}
    107__setup("video=", video_setup);