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9d44190e | 1 | /* |
2 | * machine_kexec.c - handle transition of Linux booting another kernel | |
3 | * Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com> | |
4 | * | |
5 | * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz | |
6 | * LANDISK/sh4 supported by kogiidena | |
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/mm.h> | |
13 | #include <linux/kexec.h> | |
14 | #include <linux/delay.h> | |
15 | #include <linux/reboot.h> | |
16 | #include <asm/pgtable.h> | |
17 | #include <asm/pgalloc.h> | |
18 | #include <asm/mmu_context.h> | |
19 | #include <asm/io.h> | |
20 | #include <asm/cacheflush.h> | |
21 | ||
22 | typedef NORET_TYPE void (*relocate_new_kernel_t)( | |
23 | unsigned long indirection_page, | |
24 | unsigned long reboot_code_buffer, | |
25 | unsigned long start_address, | |
26 | unsigned long vbr_reg) ATTRIB_NORET; | |
27 | ||
2efe55a9 TK |
28 | extern const unsigned char relocate_new_kernel[]; |
29 | extern const unsigned int relocate_new_kernel_size; | |
9d44190e | 30 | extern void *gdb_vbr_vector; |
31 | ||
9d44190e | 32 | void machine_shutdown(void) |
33 | { | |
34 | } | |
35 | ||
36 | void machine_crash_shutdown(struct pt_regs *regs) | |
37 | { | |
38 | } | |
39 | ||
40 | /* | |
41 | * Do what every setup is needed on image and the | |
42 | * reboot code buffer to allow us to avoid allocations | |
43 | * later. | |
44 | */ | |
45 | int machine_kexec_prepare(struct kimage *image) | |
46 | { | |
47 | return 0; | |
48 | } | |
49 | ||
50 | void machine_kexec_cleanup(struct kimage *image) | |
51 | { | |
52 | } | |
53 | ||
54 | static void kexec_info(struct kimage *image) | |
55 | { | |
56 | int i; | |
57 | printk("kexec information\n"); | |
58 | for (i = 0; i < image->nr_segments; i++) { | |
59 | printk(" segment[%d]: 0x%08x - 0x%08x (0x%08x)\n", | |
60 | i, | |
61 | (unsigned int)image->segment[i].mem, | |
62 | (unsigned int)image->segment[i].mem + image->segment[i].memsz, | |
63 | (unsigned int)image->segment[i].memsz); | |
64 | } | |
65 | printk(" start : 0x%08x\n\n", (unsigned int)image->start); | |
66 | } | |
67 | ||
68 | ||
69 | /* | |
70 | * Do not allocate memory (or fail in any way) in machine_kexec(). | |
71 | * We are past the point of no return, committed to rebooting now. | |
72 | */ | |
73 | NORET_TYPE void machine_kexec(struct kimage *image) | |
74 | { | |
75 | ||
76 | unsigned long page_list; | |
77 | unsigned long reboot_code_buffer; | |
78 | unsigned long vbr_reg; | |
79 | relocate_new_kernel_t rnk; | |
80 | ||
81 | #if defined(CONFIG_SH_STANDARD_BIOS) | |
82 | vbr_reg = ((unsigned long )gdb_vbr_vector) - 0x100; | |
83 | #else | |
84 | vbr_reg = 0x80000000; // dummy | |
85 | #endif | |
86 | /* Interrupts aren't acceptable while we reboot */ | |
87 | local_irq_disable(); | |
88 | ||
89 | page_list = image->head; | |
90 | ||
91 | /* we need both effective and real address here */ | |
92 | reboot_code_buffer = | |
93 | (unsigned long)page_address(image->control_code_page); | |
94 | ||
95 | /* copy our kernel relocation code to the control code page */ | |
96 | memcpy((void *)reboot_code_buffer, relocate_new_kernel, | |
97 | relocate_new_kernel_size); | |
98 | ||
99 | kexec_info(image); | |
100 | flush_cache_all(); | |
101 | ||
102 | /* now call it */ | |
103 | rnk = (relocate_new_kernel_t) reboot_code_buffer; | |
104 | (*rnk)(page_list, reboot_code_buffer, image->start, vbr_reg); | |
105 | } | |
106 |