Report that kernel is tainted if there was an OOPS
[linux-2.6.git] / arch / mips / kernel / machine_kexec.c
1 /*
2  * machine_kexec.c for kexec
3  * Created by <nschichan@corp.free.fr> on Thu Oct 12 15:15:06 2006
4  *
5  * This source code is licensed under the GNU General Public License,
6  * Version 2.  See the file COPYING for more details.
7  */
8
9 #include <linux/kexec.h>
10 #include <linux/mm.h>
11 #include <linux/delay.h>
12
13 #include <asm/cacheflush.h>
14 #include <asm/page.h>
15
16 extern const unsigned char relocate_new_kernel[];
17 extern const unsigned int relocate_new_kernel_size;
18
19 extern unsigned long kexec_start_address;
20 extern unsigned long kexec_indirection_page;
21
22 int
23 machine_kexec_prepare(struct kimage *kimage)
24 {
25         return 0;
26 }
27
28 void
29 machine_kexec_cleanup(struct kimage *kimage)
30 {
31 }
32
33 void
34 machine_shutdown(void)
35 {
36 }
37
38 void
39 machine_crash_shutdown(struct pt_regs *regs)
40 {
41 }
42
43 void
44 machine_kexec(struct kimage *image)
45 {
46         unsigned long reboot_code_buffer;
47         unsigned long entry;
48         unsigned long *ptr;
49
50         reboot_code_buffer =
51           (unsigned long)page_address(image->control_code_page);
52
53         kexec_start_address = image->start;
54         kexec_indirection_page = phys_to_virt(image->head & PAGE_MASK);
55
56         memcpy((void*)reboot_code_buffer, relocate_new_kernel,
57                relocate_new_kernel_size);
58
59         /*
60          * The generic kexec code builds a page list with physical
61          * addresses. they are directly accessible through KSEG0 (or
62          * CKSEG0 or XPHYS if on 64bit system), hence the
63          * pys_to_virt() call.
64          */
65         for (ptr = &image->head; (entry = *ptr) && !(entry &IND_DONE);
66              ptr = (entry & IND_INDIRECTION) ?
67                phys_to_virt(entry & PAGE_MASK) : ptr + 1) {
68                 if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
69                     *ptr & IND_DESTINATION)
70                         *ptr = phys_to_virt(*ptr);
71         }
72
73         /*
74          * we do not want to be bothered.
75          */
76         local_irq_disable();
77
78         flush_icache_range(reboot_code_buffer,
79                            reboot_code_buffer + KEXEC_CONTROL_CODE_SIZE);
80
81         printk("Will call new kernel at %08x\n", image->start);
82         printk("Bye ...\n");
83         flush_cache_all();
84         ((void (*)(void))reboot_code_buffer)();
85 }