kernel/arch/m68k/kernel/machine_kexec.c

   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
  13 extern const unsigned char relocate_new_kernel[];
  14 extern const size_t relocate_new_kernel_size;
  15
  16 int machine_kexec_prepare(struct kimage *kimage)
  17 {
  18         return 0;
  19 }
  20
  21 void machine_kexec_cleanup(struct kimage *kimage)
  22 {
  23 }
  24
  25 void machine_shutdown(void)
  26 {
  27 }
  28
  29 void machine_crash_shutdown(struct pt_regs *regs)
  30 {
  31 }
  32
  33 typedef void (*relocate_kernel_t)(unsigned long ptr,
  34                                   unsigned long start,
  35                                   unsigned long cpu_mmu_flags) __noreturn;
  36
  37 void 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 }