1/*
2 * PPC32 code to handle Linux booting another kernel.
3 *
4 * Copyright (C) 2002-2003 Eric Biederman  <ebiederm@xmission.com>
5 * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
6 * Copyright (C) 2005 IBM Corporation.
7 *
8 * This source code is licensed under the GNU General Public License,
9 * Version 2.  See the file COPYING for more details.
10 */
11
12#include <linux/kexec.h>
13#include <linux/mm.h>
14#include <linux/string.h>
15#include <asm/cacheflush.h>
16#include <asm/hw_irq.h>
17#include <asm/io.h>
18
19typedef NORET_TYPE void (*relocate_new_kernel_t)(
20				unsigned long indirection_page,
21				unsigned long reboot_code_buffer,
22				unsigned long start_address) ATTRIB_NORET;
23
24/*
25 * This is a generic machine_kexec function suitable at least for
26 * non-OpenFirmware embedded platforms.
27 * It merely copies the image relocation code to the control page and
28 * jumps to it.
29 * A platform specific function may just call this one.
30 */
31void default_machine_kexec(struct kimage *image)
32{
33	extern const unsigned char relocate_new_kernel[];
34	extern const unsigned int relocate_new_kernel_size;
35	unsigned long page_list;
36	unsigned long reboot_code_buffer, reboot_code_buffer_phys;
37	relocate_new_kernel_t rnk;
38
39	/* Interrupts aren't acceptable while we reboot */
40	local_irq_disable();
41
42	page_list = image->head;
43
44	/* we need both effective and real address here */
45	reboot_code_buffer =
46			(unsigned long)page_address(image->control_code_page);
47	reboot_code_buffer_phys = virt_to_phys((void *)reboot_code_buffer);
48
49	/* copy our kernel relocation code to the control code page */
50	memcpy((void *)reboot_code_buffer, relocate_new_kernel,
51						relocate_new_kernel_size);
52
53	flush_icache_range(reboot_code_buffer,
54				reboot_code_buffer + KEXEC_CONTROL_CODE_SIZE);
55	printk(KERN_INFO "Bye!\n");
56
57	/* now call it */
58	rnk = (relocate_new_kernel_t) reboot_code_buffer;
59	(*rnk)(page_list, reboot_code_buffer_phys, image->start);
60}
61
62int default_machine_kexec_prepare(struct kimage *image)
63{
64	return 0;
65}
66