initramfs: the root filesystem from the RAM disk the boot loader loaded. More...

#include <core/system.h>
#include <core/string.h>
#include <core/panic.h>
#include <mm/mm.h>
#include <dev/ramdev.h>
#include <fs/vfs.h>
#include <fs/initramfs.h>
#include <fs/devfs.h>
#include <fs/posix.h>
#include <aquila/errno.h>
#include <ds/queue.h>
#include <boot/boot.h>

Functions
int	initramfs_archiver_register (struct fs *fs)
	Registers a filesystem that can make a root from a RAM disk archive.
int	load_ramdisk (module_t *module)
	Mounts the RAM disk as the root filesystem.

Variables
static struct vnode *	rd_dev = NULL
static struct queue *	archivers = QUEUE_NEW()

Detailed Description

initramfs: the root filesystem from the RAM disk the boot loader loaded.

The RAM disk is an archive; each archiver (cpiofs, the only one) is asked in turn to make a filesystem from it, and the first that can becomes the root.

Definition in file initramfs.c.

Function Documentation

◆ initramfs_archiver_register()

int initramfs_archiver_register ( struct fs * fs )

Registers a filesystem that can make a root from a RAM disk archive.

Parameters

fs	the filesystem, whose load operation reads the archive

Returns: 0, or -ENOMEM

Definition at line 32 of file initramfs.c.

References archivers, initramfs_archiver_register(), fs::name, and printk().

Referenced by cpio_init(), and initramfs_archiver_register().

◆ load_ramdisk()

int load_ramdisk ( module_t * module )

Mounts the RAM disk as the root filesystem.

The kernel can't go on without a root: if no archiver can read the RAM disk, it panics.

Parameters

module the boot loader's module that holds the RAM disk

Returns: what mounting the root returns

Definition at line 49 of file initramfs.c.

References archivers, DEV, devfs, vnode::fs, kmalloc(), fs::load, load_ramdisk(), M_ZERO, vnode::mode, NULL, panic, printk(), queue_for, rd_dev, rd_size, vnode::rdev, vnode::size, and vfs_mount_root().

Referenced by kmain(), and load_ramdisk().

Variable Documentation

◆ archivers

struct queue* archivers = QUEUE_NEW()

static

Definition at line 24 of file initramfs.c.

Referenced by initramfs_archiver_register(), and load_ramdisk().

◆ rd_dev

struct vnode* rd_dev = NULL

static

Definition at line 23 of file initramfs.c.

Referenced by load_ramdisk().

Functions