arch/x86/boot/compressed/cmdline.c

Source file repositories/reference/linux-study-clean/arch/x86/boot/compressed/cmdline.c

File Facts

System
Linux kernel
Corpus path
arch/x86/boot/compressed/cmdline.c
Extension
.c
Size
783 bytes
Lines
33
Domain
Architecture Layer
Bucket
arch/x86
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
#include "misc.h"

#include <asm/bootparam.h>

static unsigned long fs;
static inline void set_fs(unsigned long seg)
{
	fs = seg << 4;  /* shift it back */
}
typedef unsigned long addr_t;
static inline char rdfs8(addr_t addr)
{
	return *((char *)(fs + addr));
}
#include "../cmdline.c"
unsigned long get_cmd_line_ptr(void)
{
	unsigned long cmd_line_ptr = boot_params_ptr->hdr.cmd_line_ptr;

	cmd_line_ptr |= (u64)boot_params_ptr->ext_cmd_line_ptr << 32;

	return cmd_line_ptr;
}
int cmdline_find_option(const char *option, char *buffer, int bufsize)
{
	return __cmdline_find_option(get_cmd_line_ptr(), option, buffer, bufsize);
}
int cmdline_find_option_bool(const char *option)
{
	return __cmdline_find_option_bool(get_cmd_line_ptr(), option);
}

Annotation

Implementation Notes