Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

#include <linux/unistd.h>

#include <linux/kernel.h>

#include <linux/fs.h>

#include <linux/minix_fs.h>

#include <linux/ext2_fs.h>

#include <linux/romfs_fs.h>

#include <linux/initrd.h>

#include <linux/sched.h>

#include <linux/freezer.h>

#include "do_mounts.h"

unsigned long initrd_start, initrd_end;

int initrd_below_start_ok;

unsigned int real_root_dev;     /* do_proc_dointvec cannot handle kdev_t */

static int __initdata old_fd, root_fd;

static int __initdata mount_initrd = 1;

static int __init no_initrd(char *str)

{

        mount_initrd = 0;

        return 1;

}

__setup("noinitrd", no_initrd);

static int __init do_linuxrc(void * shell)

{

        static char *argv[] = { "linuxrc", NULL, };

        extern char * envp_init[];

        sys_close(old_fd);sys_close(root_fd);

        sys_close(0);sys_close(1);sys_close(2);

        sys_setsid();

        (void) sys_open("/dev/console",O_RDWR,0);

        (void) sys_dup(0);

        (void) sys_dup(0);

        return kernel_execve(shell, argv, envp_init);

}

static void __init handle_initrd(void)

{

        int error;

        int pid;

        real_root_dev = new_encode_dev(ROOT_DEV);

        create_dev("/dev/root.old", Root_RAM0);

        /* mount initrd on rootfs' /root */

        mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY);

        sys_mkdir("/old", 0700);

        root_fd = sys_open("/", 0, 0);

        old_fd = sys_open("/old", 0, 0);

        /* move initrd over / and chdir/chroot in initrd root */

        sys_chdir("/root");

        sys_mount(".", "/", NULL, MS_MOVE, NULL);

        sys_chroot(".");

        /*

         * In case that a resume from disk is carried out by linuxrc or one of

         * its children, we need to tell the freezer not to wait for us.

         */

        current->flags |= PF_FREEZER_SKIP;

        pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD);

        if (pid > 0)

                while (pid != sys_wait4(-1, NULL, 0, NULL))

                        yield();

        current->flags &= ~PF_FREEZER_SKIP;

        /* move initrd to rootfs' /old */

        sys_fchdir(old_fd);

        sys_mount("/", ".", NULL, MS_MOVE, NULL);

        /* switch root and cwd back to / of rootfs */

        sys_fchdir(root_fd);

        sys_chroot(".");

        sys_close(old_fd);

        sys_close(root_fd);

        if (new_decode_dev(real_root_dev) == Root_RAM0) {

                sys_chdir("/old");

                return;

        }

        ROOT_DEV = new_decode_dev(real_root_dev);

        mount_root();

        printk(KERN_NOTICE "Trying to move old root to /initrd ... ");

        error = sys_mount("/old", "/root/initrd", NULL, MS_MOVE, NULL);

        if (!error)

                printk("okay\n");

        else {

                int fd = sys_open("/dev/root.old", O_RDWR, 0);

                if (error == -ENOENT)

                        printk("/initrd does not exist. Ignored.\n");

                else

                        printk("failed\n");

                printk(KERN_NOTICE "Unmounting old root\n");

                sys_umount("/old", MNT_DETACH);

                printk(KERN_NOTICE "Trying to free ramdisk memory ... ");

                if (fd < 0) {

                        error = fd;

                } else {

                        error = sys_ioctl(fd, BLKFLSBUF, 0);

                        sys_close(fd);

                }

                printk(!error ? "okay\n" : "failed\n");

        }

}

int __init initrd_load(void)

{

        if (mount_initrd) {

                create_dev("/dev/ram", Root_RAM0);

                /*

                 * Load the initrd data into /dev/ram0. Execute it as initrd

                 * unless /dev/ram0 is supposed to be our actual root device,

                 * in that case the ram disk is just set up here, and gets

                 * mounted in the normal path.

                 */

                if (rd_load_image("/initrd.image") && ROOT_DEV != Root_RAM0) {

                        sys_unlink("/initrd.image");

                        handle_initrd();

                        return 1;

                }

        }

        sys_unlink("/initrd.image");

        return 0;

}