LXR linux/arch/m68k/kernel/machine

   1/*
   2 * machine_kexec.c - handle transition of Linux booting another kernel
   3 */
   4#include <linux/compiler.h>
   5#include <linux/kexec.h>
   6#include <linux/mm.h>
   7#include <linux/delay.h>
   8
   9#include <asm/cacheflush.h>
  10#include <asm/page.h>
  11#include <asm/setup.h>
  12
  13extern const unsigned char relocate_new_kernel[];
  14extern const size_t relocate_new_kernel_size;
  15
  16int machine_kexec_prepare(struct kimage *kimage)
  17{
  18        return 0;
  19}
  20
  21void machine_kexec_cleanup(struct kimage *kimage)
  22{
  23}
  24
  25void machine_shutdown(void)
  26{
  27}
  28
  29void machine_crash_shutdown(struct pt_regs *regs)
  30{
  31}
  32
  33typedef void (*relocate_kernel_t)(unsigned long ptr,
  34                                  unsigned long start,
  35                                  unsigned long cpu_mmu_flags) __noreturn;
  36
  37void machine_kexec(struct kimage *image)
  38{
  39        void *reboot_code_buffer;
  40        unsigned long cpu_mmu_flags;
  41
  42        reboot_code_buffer = page_address(image->control_code_page);
  43
  44        memcpy(reboot_code_buffer, relocate_new_kernel,
  45               relocate_new_kernel_size);
  46
  47        /*
  48         * we do not want to be bothered.
  49         */
  50        local_irq_disable();
  51
  52        pr_info("Will call new kernel at 0x%08lx. Bye...\n", image->start);
  53        __flush_cache_all();
  54        cpu_mmu_flags = m68k_cputype | m68k_mmutype << 8;
  55        ((relocate_kernel_t) reboot_code_buffer)(image->head & PAGE_MASK,
  56                                                 image->start,
  57                                                 cpu_mmu_flags);
  58}
  59