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
16 extern const unsigned char relocate_new_kernel[];
17 extern const 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 extern 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
31 int machine_kexec_prepare(struct kimage *image)
32 {
33 return 0;
34 }
35
36 void machine_kexec_cleanup(struct kimage *image)
37 {
38 }
39
40 void machine_shutdown(void)
41 {
42 }
43
44 void machine_crash_shutdown(struct pt_regs *regs)
45 {
46 }
47
48 void 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
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