machine_kexec.c 1.6 KB

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  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. #include <linux/device.h>
  10. #include <linux/mm.h>
  11. #include <linux/kexec.h>
  12. #include <linux/delay.h>
  13. #include <linux/reboot.h>
  14. #include <asm/cio.h>
  15. #include <asm/setup.h>
  16. #include <asm/pgtable.h>
  17. #include <asm/pgalloc.h>
  18. #include <asm/system.h>
  19. #include <asm/smp.h>
  20. #include <asm/reset.h>
  21. #include <asm/ipl.h>
  22. typedef void (*relocate_kernel_t)(kimage_entry_t *, unsigned long);
  23. extern const unsigned char relocate_kernel[];
  24. extern const unsigned long long relocate_kernel_len;
  25. int machine_kexec_prepare(struct kimage *image)
  26. {
  27. void *reboot_code_buffer;
  28. /* Can't replace kernel image since it is read-only. */
  29. if (ipl_flags & IPL_NSS_VALID)
  30. return -ENOSYS;
  31. /* We don't support anything but the default image type for now. */
  32. if (image->type != KEXEC_TYPE_DEFAULT)
  33. return -EINVAL;
  34. /* Get the destination where the assembler code should be copied to.*/
  35. reboot_code_buffer = (void *) page_to_phys(image->control_code_page);
  36. /* Then copy it */
  37. memcpy(reboot_code_buffer, relocate_kernel, relocate_kernel_len);
  38. return 0;
  39. }
  40. void machine_kexec_cleanup(struct kimage *image)
  41. {
  42. }
  43. void machine_shutdown(void)
  44. {
  45. printk(KERN_INFO "kexec: machine_shutdown called\n");
  46. }
  47. void machine_kexec(struct kimage *image)
  48. {
  49. relocate_kernel_t data_mover;
  50. smp_send_stop();
  51. pfault_fini();
  52. s390_reset_system();
  53. data_mover = (relocate_kernel_t) page_to_phys(image->control_code_page);
  54. /* Call the moving routine */
  55. (*data_mover)(&image->head, image->start);
  56. for (;;);
  57. }