LXR linux/arch/m68k/kernel/machine

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * machine_kexec.c - handle transition of Linux booting another kernel
   4 */
   5#include <linux/compiler.h>
   6#include <linux/kexec.h>
   7#include <linux/mm.h>
   8#include <linux/delay.h>
   9
  10#include <asm/cacheflush.h>
  11#include <asm/page.h>
  12#include <asm/setup.h>
  13
  14extern const unsigned char relocate_new_kernel[];
  15extern const size_t relocate_new_kernel_size;
  16
  17int machine_kexec_prepare(struct kimage *kimage)
  18{
  19        return 0;
  20}
  21
  22void machine_kexec_cleanup(struct kimage *kimage)
  23{
  24}
  25
  26void machine_shutdown(void)
  27{
  28}
  29
  30void machine_crash_shutdown(struct pt_regs *regs)
  31{
  32}
  33
  34typedef void (*relocate_kernel_t)(unsigned long ptr,
  35                                  unsigned long start,
  36                                  unsigned long cpu_mmu_flags) __noreturn;
  37
  38void machine_kexec(struct kimage *image)
  39{
  40        void *reboot_code_buffer;
  41        unsigned long cpu_mmu_flags;
  42
  43        reboot_code_buffer = page_address(image->control_code_page);
  44
  45        memcpy(reboot_code_buffer, relocate_new_kernel,
  46               relocate_new_kernel_size);
  47
  48        /*
  49         * we do not want to be bothered.
  50         */
  51        local_irq_disable();
  52
  53        pr_info("Will call new kernel at 0x%08lx. Bye...\n", image->start);
  54        __flush_cache_all();
  55        cpu_mmu_flags = m68k_cputype | m68k_mmutype << 8;
  56        ((relocate_kernel_t) reboot_code_buffer)(image->head & PAGE_MASK,
  57                                                 image->start,
  58                                                 cpu_mmu_flags);
  59}
  60