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>
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>
16 extern const unsigned char relocate_new_kernel[];
17 extern const 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;
24 extern unsigned long kexec_boot_atags;
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.
31 int machine_kexec_prepare(struct kimage *image)
36 void machine_kexec_cleanup(struct kimage *image)
40 void machine_crash_shutdown(struct pt_regs *regs)
44 void machine_kexec(struct kimage *image)
46 unsigned long page_list;
47 unsigned long reboot_code_buffer_phys;
48 void *reboot_code_buffer;
51 page_list = image->head & PAGE_MASK;
53 /* we need both effective and real address here */
54 reboot_code_buffer_phys =
55 page_to_pfn(image->control_code_page) << PAGE_SHIFT;
56 reboot_code_buffer = page_address(image->control_code_page);
58 /* Prepare parameters for reboot_code_buffer*/
59 kexec_start_address = image->start;
60 kexec_indirection_page = page_list;
61 kexec_mach_type = machine_arch_type;
62 kexec_boot_atags = image->start - KEXEC_ARM_ZIMAGE_OFFSET + KEXEC_ARM_ATAGS_OFFSET;
64 /* copy our kernel relocation code to the control code page */
65 memcpy(reboot_code_buffer,
66 relocate_new_kernel, relocate_new_kernel_size);
69 flush_icache_range((unsigned long) reboot_code_buffer,
70 (unsigned long) reboot_code_buffer + KEXEC_CONTROL_PAGE_SIZE);
71 printk(KERN_INFO "Bye!\n");
75 setup_mm_for_reboot(0); /* mode is not used, so just pass 0*/
79 cpu_reset(reboot_code_buffer_phys);