arch/arm/kernel/machine_kexec.c

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