linux/arch/x86/boot/cmdline.c

// SPDX-License-Identifier: GPL-2.0-only
/* -*- linux-c -*- ------------------------------------------------------- *
 *
 *   Copyright (C) 1991, 1992 Linus Torvalds
 *   Copyright 2007 rPath, Inc. - All Rights Reserved
 *
 * ----------------------------------------------------------------------- */

/*
 * Simple command-line parser for early boot.
 */

#include "boot.h"

static inline int myisspace(u8 c)
{ … }

/*
 * Find a non-boolean option, that is, "option=argument".  In accordance
 * with standard Linux practice, if this option is repeated, this returns
 * the last instance on the command line.
 *
 * Returns the length of the argument (regardless of if it was
 * truncated to fit in the buffer), or -1 on not found.
 */
int __cmdline_find_option(unsigned long cmdline_ptr, const char *option, char *buffer, int bufsize)
{ … }

/*
 * Find a boolean option (like quiet,noapic,nosmp....)
 *
 * Returns the position of that option (starts counting with 1)
 * or 0 on not found
 */
int __cmdline_find_option_bool(unsigned long cmdline_ptr, const char *option)
{ … }