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 unsigned long kexec_start_address;
  20 extern unsigned long kexec_indirection_page;
  21 extern unsigned long kexec_mach_type;
  22
  23 extern void setup_mm_for_reboot(char mode);
  24
  25 int machine_kexec_prepare(struct kimage *image)
  26 {
  27         return 0;
  28 }
  29
  30 void machine_kexec_cleanup(struct kimage *image)
  31 {
  32 }
  33
  34 void machine_shutdown(void)
  35 {
  36 }
  37
  38 void machine_crash_shutdown(struct pt_regs *regs)
  39 {
  40 }
  41
  42 void machine_kexec(struct kimage *image)
  43 {
  44         unsigned long page_list;
  45         unsigned long reboot_code_buffer_phys;
  46         void *reboot_code_buffer;
  47
  48
  49         page_list = image->head & PAGE_MASK;
  50
  51         /* we need both effective and real address here */
  52         reboot_code_buffer_phys =
  53             page_to_pfn(image->control_code_page) << PAGE_SHIFT;
  54         reboot_code_buffer = page_address(image->control_code_page);
  55
  56         /* Prepare parameters for reboot_code_buffer*/
  57         kexec_start_address = image->start;
  58         kexec_indirection_page = page_list;
  59         kexec_mach_type = machine_arch_type;
  60
  61         /* copy our kernel relocation code to the control code page */
  62         memcpy(reboot_code_buffer,
  63                relocate_new_kernel, relocate_new_kernel_size);
  64
  65
  66         flush_icache_range(reboot_code_buffer,
  67                            reboot_code_buffer + KEXEC_CONTROL_CODE_SIZE);
  68         printk(KERN_INFO "Bye!\n");
  69
  70         cpu_proc_fin();
  71         setup_mm_for_reboot(0); /* mode is not used, so just pass 0*/
  72         cpu_reset(reboot_code_buffer_phys);
  73 }