2 * machine_kexec.c - handle transition of Linux booting another kernel
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>
13 #include <asm/cacheflush.h>
14 #include <asm/mach-types.h>
16 const extern unsigned char relocate_new_kernel[];
17 const extern unsigned int relocate_new_kernel_size;
19 extern void setup_mm_for_reboot(char mode);
21 extern unsigned long kexec_start_address;
22 extern unsigned long kexec_indirection_page;
23 extern unsigned long kexec_mach_type;
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.
30 int machine_kexec_prepare(struct kimage *image)
35 void machine_kexec_cleanup(struct kimage *image)
39 void machine_shutdown(void)
43 void machine_crash_shutdown(struct pt_regs *regs)
47 void machine_kexec(struct kimage *image)
49 unsigned long page_list;
50 unsigned long reboot_code_buffer_phys;
51 void *reboot_code_buffer;
54 page_list = image->head & PAGE_MASK;
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);
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;
66 /* copy our kernel relocation code to the control code page */
67 memcpy(reboot_code_buffer,
68 relocate_new_kernel, relocate_new_kernel_size);
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");
76 setup_mm_for_reboot(0); /* mode is not used, so just pass 0*/
77 cpu_reset(reboot_code_buffer_phys);