LXR linux/arch/mips/kernel/machine

   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
  16extern const unsigned char relocate_new_kernel[];
  17extern const size_t relocate_new_kernel_size;
  18
  19extern unsigned long kexec_start_address;
  20extern unsigned long kexec_indirection_page;
  21
  22int
  23machine_kexec_prepare(struct kimage *kimage)
  24{
  25        return 0;
  26}
  27
  28void
  29machine_kexec_cleanup(struct kimage *kimage)
  30{
  31}
  32
  33void
  34machine_shutdown(void)
  35{
  36}
  37
  38void
  39machine_crash_shutdown(struct pt_regs *regs)
  40{
  41}
  42
  43typedef void (*noretfun_t)(void) __attribute__((noreturn));
  44
  45void
  46machine_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}
  86