arch/s390/kernel/machine_kexec.c

   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
  23 typedef void (*relocate_kernel_t)(kimage_entry_t *, unsigned long);
  24
  25 extern const unsigned char relocate_kernel[];
  26 extern const unsigned long long relocate_kernel_len;
  27
  28 int machine_kexec_prepare(struct kimage *image)
  29 {
  30         void *reboot_code_buffer;
  31
  32         /* We don't support anything but the default image type for now. */
  33         if (image->type != KEXEC_TYPE_DEFAULT)
  34                 return -EINVAL;
  35
  36         /* Get the destination where the assembler code should be copied to.*/
  37         reboot_code_buffer = (void *) page_to_phys(image->control_code_page);
  38
  39         /* Then copy it */
  40         memcpy(reboot_code_buffer, relocate_kernel, relocate_kernel_len);
  41         return 0;
  42 }
  43
  44 void machine_kexec_cleanup(struct kimage *image)
  45 {
  46 }
  47
  48 void machine_shutdown(void)
  49 {
  50         printk(KERN_INFO "kexec: machine_shutdown called\n");
  51 }
  52
  53 void machine_kexec(struct kimage *image)
  54 {
  55         relocate_kernel_t data_mover;
  56
  57         smp_send_stop();
  58         pfault_fini();
  59         s390_reset_system();
  60
  61         data_mover = (relocate_kernel_t) page_to_phys(image->control_code_page);
  62
  63         /* Call the moving routine */
  64         (*data_mover)(&image->head, image->start);
  65         for (;;);
  66 }