machine_kexec.c revision 3d3f78d752bfada5b6041f2f7bd0833d8bdf7a4a 
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
16extern const unsigned char relocate_new_kernel[];
17extern const unsigned int relocate_new_kernel_size;
18
19extern void setup_mm_for_reboot(char mode);
20
21extern unsigned long kexec_start_address;
22extern unsigned long kexec_indirection_page;
23extern unsigned long kexec_mach_type;
24extern 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
31int machine_kexec_prepare(struct kimage *image)
32{
33	return 0;
34}
35
36void machine_kexec_cleanup(struct kimage *image)
37{
38}
39
40void machine_crash_shutdown(struct pt_regs *regs)
41{
42}
43
44void machine_kexec(struct kimage *image)
45{
46	unsigned long page_list;
47	unsigned long reboot_code_buffer_phys;
48	void *reboot_code_buffer;
49
50
51	page_list = image->head & PAGE_MASK;
52
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);
57
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;
63
64	/* copy our kernel relocation code to the control code page */
65	memcpy(reboot_code_buffer,
66	       relocate_new_kernel, relocate_new_kernel_size);
67
68
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");
72
73	local_irq_disable();
74	local_fiq_disable();
75	setup_mm_for_reboot(0); /* mode is not used, so just pass 0*/
76	flush_cache_all();
77	cpu_proc_fin();
78	flush_cache_all();
79	cpu_reset(reboot_code_buffer_phys);
80}
81