LXR linux/arch/s390/kernel/machine

   1/*
   2 * arch/s390/kernel/machine_kexec.c
   3 *
   4 * Copyright IBM Corp. 2005,2006
   5 *
   6 * Author(s): Rolf Adelsberger,
   7 *            Heiko Carstens <heiko.carstens@de.ibm.com>
   8 */
   9
  10#include <linux/device.h>
  11#include <linux/mm.h>
  12#include <linux/kexec.h>
  13#include <linux/delay.h>
  14#include <linux/reboot.h>
  15#include <asm/cio.h>
  16#include <asm/setup.h>
  17#include <asm/pgtable.h>
  18#include <asm/pgalloc.h>
  19#include <asm/system.h>
  20#include <asm/smp.h>
  21#include <asm/reset.h>
  22#include <asm/ipl.h>
  23
  24typedef void (*relocate_kernel_t)(kimage_entry_t *, unsigned long);
  25
  26extern const unsigned char relocate_kernel[];
  27extern const unsigned long long relocate_kernel_len;
  28
  29int machine_kexec_prepare(struct kimage *image)
  30{
  31        void *reboot_code_buffer;
  32
  33        /* Can't replace kernel image since it is read-only. */
  34        if (ipl_flags & IPL_NSS_VALID)
  35                return -ENOSYS;
  36
  37        /* We don't support anything but the default image type for now. */
  38        if (image->type != KEXEC_TYPE_DEFAULT)
  39                return -EINVAL;
  40
  41        /* Get the destination where the assembler code should be copied to.*/
  42        reboot_code_buffer = (void *) page_to_phys(image->control_code_page);
  43
  44        /* Then copy it */
  45        memcpy(reboot_code_buffer, relocate_kernel, relocate_kernel_len);
  46        return 0;
  47}
  48
  49void machine_kexec_cleanup(struct kimage *image)
  50{
  51}
  52
  53void machine_shutdown(void)
  54{
  55}
  56
  57void machine_kexec(struct kimage *image)
  58{
  59        relocate_kernel_t data_mover;
  60
  61        smp_send_stop();
  62        pfault_fini();
  63        s390_reset_system();
  64
  65        data_mover = (relocate_kernel_t) page_to_phys(image->control_code_page);
  66
  67        /* Call the moving routine */
  68        (*data_mover)(&image->head, image->start);
  69        for (;;);
  70}
  71