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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 (;;);
}