arch/um/kernel/initrd.c

Source file repositories/reference/linux-study-clean/arch/um/kernel/initrd.c

File Facts

System
Linux kernel
Corpus path
arch/um/kernel/initrd.c
Extension
.c
Size
910 bytes
Lines
47
Domain
Architecture Layer
Bucket
arch/um
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
/*
 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 */

#include <linux/init.h>
#include <linux/memblock.h>
#include <linux/initrd.h>
#include <asm/types.h>
#include <init.h>
#include <os.h>

#include "um_arch.h"

/* Changed by uml_initrd_setup, which is a setup */
static char *initrd __initdata = NULL;

int __init read_initrd(void)
{
	unsigned long long size;
	void *area;

	if (!initrd)
		return 0;

	area = uml_load_file(initrd, &size);
	if (!area)
		return 0;

	initrd_start = (unsigned long) area;
	initrd_end = initrd_start + size;
	return 0;
}

static int __init uml_initrd_setup(char *line, int *add)
{
	*add = 0;
	initrd = line;
	return 0;
}

__uml_setup("initrd=", uml_initrd_setup,
"initrd=<initrd image>\n"
"    This is used to boot UML from an initrd image.  The argument is the\n"
"    name of the file containing the image.\n\n"
);

Annotation

Implementation Notes