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/arch/powerpc/kernel/machine_kexec_32.c

http://github.com/mirrors/linux
C | 69 lines | 35 code | 11 blank | 23 comment | 0 complexity | c40f1c305e0f55458d0577b600b6a098 MD5 | raw file
 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 void (*relocate_new_kernel_t)(
20				unsigned long indirection_page,
21				unsigned long reboot_code_buffer,
22				unsigned long start_address) __noreturn;
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	/* mask each interrupt so we are in a more sane state for the
43	 * kexec kernel */
44	machine_kexec_mask_interrupts();
45
46	page_list = image->head;
47
48	/* we need both effective and real address here */
49	reboot_code_buffer =
50			(unsigned long)page_address(image->control_code_page);
51	reboot_code_buffer_phys = virt_to_phys((void *)reboot_code_buffer);
52
53	/* copy our kernel relocation code to the control code page */
54	memcpy((void *)reboot_code_buffer, relocate_new_kernel,
55						relocate_new_kernel_size);
56
57	flush_icache_range(reboot_code_buffer,
58				reboot_code_buffer + KEXEC_CONTROL_PAGE_SIZE);
59	printk(KERN_INFO "Bye!\n");
60
61	/* now call it */
62	rnk = (relocate_new_kernel_t) reboot_code_buffer;
63	(*rnk)(page_list, reboot_code_buffer_phys, image->start);
64}
65
66int default_machine_kexec_prepare(struct kimage *image)
67{
68	return 0;
69}