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/irq.h>
11 #include <linux/kexec.h>
12 #include <linux/mm.h>
13 #include <linux/string.h>
14 #include <asm/cacheflush.h>
15 #include <asm/hw_irq.h>
16 #include <asm/io.h>
17
18 typedef void (*relocate_new_kernel_t)(
19 unsigned long indirection_page,
20 unsigned long reboot_code_buffer,
21 unsigned long start_address) __noreturn;
22
23 /*
24 * This is a generic machine_kexec function suitable at least for
25 * non-OpenFirmware embedded platforms.
26 * It merely copies the image relocation code to the control page and
27 * jumps to it.
28 * A platform specific function may just call this one.
29 */
default_machine_kexec(struct kimage * image)30 void default_machine_kexec(struct kimage *image)
31 {
32 extern const unsigned int relocate_new_kernel_size;
33 unsigned long page_list;
34 unsigned long reboot_code_buffer, reboot_code_buffer_phys;
35 relocate_new_kernel_t rnk;
36
37 /* Interrupts aren't acceptable while we reboot */
38 local_irq_disable();
39
40 /* mask each interrupt so we are in a more sane state for the
41 * kexec kernel */
42 machine_kexec_mask_interrupts();
43
44 page_list = image->head;
45
46 /* we need both effective and real address here */
47 reboot_code_buffer =
48 (unsigned long)page_address(image->control_code_page);
49 reboot_code_buffer_phys = virt_to_phys((void *)reboot_code_buffer);
50
51 /* copy our kernel relocation code to the control code page */
52 memcpy((void *)reboot_code_buffer, relocate_new_kernel,
53 relocate_new_kernel_size);
54
55 flush_icache_range(reboot_code_buffer,
56 reboot_code_buffer + KEXEC_CONTROL_PAGE_SIZE);
57 printk(KERN_INFO "Bye!\n");
58
59 if (!IS_ENABLED(CONFIG_PPC_85xx) && !IS_ENABLED(CONFIG_44x))
60 relocate_new_kernel(page_list, reboot_code_buffer_phys, image->start);
61
62 /* now call it */
63 rnk = (relocate_new_kernel_t) reboot_code_buffer;
64 (*rnk)(page_list, reboot_code_buffer_phys, image->start);
65 }
66
machine_kexec_prepare(struct kimage * image)67 int machine_kexec_prepare(struct kimage *image)
68 {
69 return 0;
70 }
71