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3d1229d6 ME |
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 | ||
9402c95f | 19 | typedef void (*relocate_new_kernel_t)( |
3d1229d6 ME |
20 | unsigned long indirection_page, |
21 | unsigned long reboot_code_buffer, | |
ff2d8b19 | 22 | unsigned long start_address) __noreturn; |
3d1229d6 ME |
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 | */ | |
31 | void default_machine_kexec(struct kimage *image) | |
32 | { | |
2efe55a9 TK |
33 | extern const unsigned char relocate_new_kernel[]; |
34 | extern const unsigned int relocate_new_kernel_size; | |
3d1229d6 ME |
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 | ||
c71635d2 MM |
42 | /* mask each interrupt so we are in a more sane state for the |
43 | * kexec kernel */ | |
44 | machine_kexec_mask_interrupts(); | |
45 | ||
3d1229d6 ME |
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, | |
163f6876 | 58 | reboot_code_buffer + KEXEC_CONTROL_PAGE_SIZE); |
3d1229d6 ME |
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 | ||
66 | int default_machine_kexec_prepare(struct kimage *image) | |
67 | { | |
68 | return 0; | |
69 | } |