1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * PPC32 code to handle Linux booting another kernel. |
4 | * |
5 | * Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com> |
6 | * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz |
7 | * Copyright (C) 2005 IBM Corporation. |
8 | */ |
9 | |
10 | #include <linux/kexec.h> |
11 | #include <linux/mm.h> |
12 | #include <linux/string.h> |
13 | #include <asm/cacheflush.h> |
14 | #include <asm/hw_irq.h> |
15 | #include <asm/io.h> |
16 | |
17 | typedef void (*relocate_new_kernel_t)( |
18 | unsigned long indirection_page, |
19 | unsigned long reboot_code_buffer, |
20 | unsigned long start_address) __noreturn; |
21 | |
22 | /* |
23 | * This is a generic machine_kexec function suitable at least for |
24 | * non-OpenFirmware embedded platforms. |
25 | * It merely copies the image relocation code to the control page and |
26 | * jumps to it. |
27 | * A platform specific function may just call this one. |
28 | */ |
29 | void default_machine_kexec(struct kimage *image) |
30 | { |
31 | extern const unsigned int relocate_new_kernel_size; |
32 | unsigned long page_list; |
33 | unsigned long reboot_code_buffer, reboot_code_buffer_phys; |
34 | relocate_new_kernel_t rnk; |
35 | |
36 | /* Interrupts aren't acceptable while we reboot */ |
37 | local_irq_disable(); |
38 | |
39 | /* mask each interrupt so we are in a more sane state for the |
40 | * kexec kernel */ |
41 | machine_kexec_mask_interrupts(); |
42 | |
43 | page_list = image->head; |
44 | |
45 | /* we need both effective and real address here */ |
46 | reboot_code_buffer = |
47 | (unsigned long)page_address(image->control_code_page); |
48 | reboot_code_buffer_phys = virt_to_phys(address: (void *)reboot_code_buffer); |
49 | |
50 | /* copy our kernel relocation code to the control code page */ |
51 | memcpy((void *)reboot_code_buffer, relocate_new_kernel, |
52 | relocate_new_kernel_size); |
53 | |
54 | flush_icache_range(start: reboot_code_buffer, |
55 | end: reboot_code_buffer + KEXEC_CONTROL_PAGE_SIZE); |
56 | printk(KERN_INFO "Bye!\n" ); |
57 | |
58 | if (!IS_ENABLED(CONFIG_PPC_85xx) && !IS_ENABLED(CONFIG_44x)) |
59 | relocate_new_kernel(page_list, reboot_code_buffer_phys, image->start); |
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 machine_kexec_prepare(struct kimage *image) |
67 | { |
68 | return 0; |
69 | } |
70 | |