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/*

 * arch/s390/kernel/machine_kexec.c

 *

 * Copyright IBM Corp. 2005,2006

 *

 * Author(s): Rolf Adelsberger,

 *            Heiko Carstens <heiko.carstens@de.ibm.com>

 */

#include <linux/device.h>

#include <linux/mm.h>

#include <linux/kexec.h>

#include <linux/delay.h>

#include <linux/reboot.h>

#include <asm/cio.h>

#include <asm/setup.h>

#include <asm/pgtable.h>

#include <asm/pgalloc.h>

#include <asm/system.h>

#include <asm/smp.h>

#include <asm/reset.h>

#include <asm/ipl.h>

typedef void (*relocate_kernel_t)(kimage_entry_t *, unsigned long);

extern const unsigned char relocate_kernel[];

extern const unsigned long long relocate_kernel_len;

int machine_kexec_prepare(struct kimage *image)

{

        void *reboot_code_buffer;

        /* Can't replace kernel image since it is read-only. */

        if (ipl_flags & IPL_NSS_VALID)

                return -ENOSYS;

        /* We don't support anything but the default image type for now. */

        if (image->type != KEXEC_TYPE_DEFAULT)

                return -EINVAL;

        /* Get the destination where the assembler code should be copied to.*/

        reboot_code_buffer = (void *) page_to_phys(image->control_code_page);

        /* Then copy it */

        memcpy(reboot_code_buffer, relocate_kernel, relocate_kernel_len);

        return 0;

}

void machine_kexec_cleanup(struct kimage *image)

{

}

void machine_shutdown(void)

{

        printk(KERN_INFO "kexec: machine_shutdown called\n");

}

void machine_kexec(struct kimage *image)

{

        relocate_kernel_t data_mover;

        smp_send_stop();

        pfault_fini();

        s390_reset_system();

        data_mover = (relocate_kernel_t) page_to_phys(image->control_code_page);

        /* Call the moving routine */

        (*data_mover)(&image->head, image->start);

        for (;;);

}