LXR linux/arch/arm/kernel/machine

   1/*
   2 * machine_kexec.c - handle transition of Linux booting another kernel
   3 */
   4
   5#include <linux/mm.h>
   6#include <linux/kexec.h>
   7#include <linux/delay.h>
   8#include <linux/reboot.h>
   9#include <linux/io.h>
  10#include <asm/pgtable.h>
  11#include <asm/pgalloc.h>
  12#include <asm/mmu_context.h>
  13#include <asm/cacheflush.h>
  14#include <asm/mach-types.h>
  15
  16extern const unsigned char relocate_new_kernel[];
  17extern const unsigned int relocate_new_kernel_size;
  18
  19extern void setup_mm_for_reboot(char mode);
  20
  21extern unsigned long kexec_start_address;
  22extern unsigned long kexec_indirection_page;
  23extern unsigned long kexec_mach_type;
  24extern unsigned long kexec_boot_atags;
  25
  26/*
  27 * Provide a dummy crash_notes definition while crash dump arrives to arm.
  28 * This prevents breakage of crash_notes attribute in kernel/ksysfs.c.
  29 */
  30
  31int machine_kexec_prepare(struct kimage *image)
  32{
  33        return 0;
  34}
  35
  36void machine_kexec_cleanup(struct kimage *image)
  37{
  38}
  39
  40void machine_shutdown(void)
  41{
  42}
  43
  44void machine_crash_shutdown(struct pt_regs *regs)
  45{
  46}
  47
  48void machine_kexec(struct kimage *image)
  49{
  50        unsigned long page_list;
  51        unsigned long reboot_code_buffer_phys;
  52        void *reboot_code_buffer;
  53
  54
  55        page_list = image->head & PAGE_MASK;
  56
  57        /* we need both effective and real address here */
  58        reboot_code_buffer_phys =
  59            page_to_pfn(image->control_code_page) << PAGE_SHIFT;
  60        reboot_code_buffer = page_address(image->control_code_page);
  61
  62        /* Prepare parameters for reboot_code_buffer*/
  63        kexec_start_address = image->start;
  64        kexec_indirection_page = page_list;
  65        kexec_mach_type = machine_arch_type;
  66        kexec_boot_atags = image->start - KEXEC_ARM_ZIMAGE_OFFSET + KEXEC_ARM_ATAGS_OFFSET;
  67
  68        /* copy our kernel relocation code to the control code page */
  69        memcpy(reboot_code_buffer,
  70               relocate_new_kernel, relocate_new_kernel_size);
  71
  72
  73        flush_icache_range((unsigned long) reboot_code_buffer,
  74                           (unsigned long) reboot_code_buffer + KEXEC_CONTROL_PAGE_SIZE);
  75        printk(KERN_INFO "Bye!\n");
  76
  77        cpu_proc_fin();
  78        setup_mm_for_reboot(0); /* mode is not used, so just pass 0*/
  79        cpu_reset(reboot_code_buffer_phys);
  80}
  81