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 
19 typedef 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  */
default_machine_kexec(struct kimage * image)31 void 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 
default_machine_kexec_prepare(struct kimage * image)66 int default_machine_kexec_prepare(struct kimage *image)
67 {
68 	return 0;
69 }
70