arch/mips/kernel/machine_kexec.c

   1 /*
   2  * machine_kexec.c for kexec
   3  * Created by <nschichan@corp.free.fr> on Thu Oct 12 15:15:06 2006
   4  *
   5  * This source code is licensed under the GNU General Public License,
   6  * Version 2.  See the file COPYING for more details.
   7  */
   8
   9 #include <linux/kexec.h>
  10 #include <linux/mm.h>
  11 #include <linux/delay.h>
  12
  13 #include <asm/cacheflush.h>
  14 #include <asm/page.h>
  15
  16 extern const unsigned char relocate_new_kernel[];
  17 extern const size_t relocate_new_kernel_size;
  18
  19 extern unsigned long kexec_start_address;
  20 extern unsigned long kexec_indirection_page;
  21
  22 int
  23 machine_kexec_prepare(struct kimage *kimage)
  24 {
  25         return 0;
  26 }
  27
  28 void
  29 machine_kexec_cleanup(struct kimage *kimage)
  30 {
  31 }
  32
  33 void
  34 machine_shutdown(void)
  35 {
  36 }
  37
  38 void
  39 machine_crash_shutdown(struct pt_regs *regs)
  40 {
  41 }
  42
  43 typedef void (*noretfun_t)(void) __attribute__((noreturn));
  44
  45 void
  46 machine_kexec(struct kimage *image)
  47 {
  48         unsigned long reboot_code_buffer;
  49         unsigned long entry;
  50         unsigned long *ptr;
  51
  52         reboot_code_buffer =
  53           (unsigned long)page_address(image->control_code_page);
  54
  55         kexec_start_address = image->start;
  56         kexec_indirection_page =
  57                 (unsigned long) phys_to_virt(image->head & PAGE_MASK);
  58
  59         memcpy((void*)reboot_code_buffer, relocate_new_kernel,
  60                relocate_new_kernel_size);
  61
  62         /*
  63          * The generic kexec code builds a page list with physical
  64          * addresses. they are directly accessible through KSEG0 (or
  65          * CKSEG0 or XPHYS if on 64bit system), hence the
  66          * pys_to_virt() call.
  67          */
  68         for (ptr = &image->head; (entry = *ptr) && !(entry &IND_DONE);
  69              ptr = (entry & IND_INDIRECTION) ?
  70                phys_to_virt(entry & PAGE_MASK) : ptr + 1) {
  71                 if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
  72                     *ptr & IND_DESTINATION)
  73                         *ptr = (unsigned long) phys_to_virt(*ptr);
  74         }
  75
  76         /*
  77          * we do not want to be bothered.
  78          */
  79         local_irq_disable();
  80
  81         printk("Will call new kernel at %08lx\n", image->start);
  82         printk("Bye ...\n");
  83         __flush_cache_all();
  84         ((noretfun_t) reboot_code_buffer)();
  85 }