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kogiidena9d441902006-01-16 22:14:10 -08001/*
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
22typedef 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
Tobias Klauser2efe55a2006-06-26 18:57:34 +020028extern const unsigned char relocate_new_kernel[];
29extern const unsigned int relocate_new_kernel_size;
kogiidena9d441902006-01-16 22:14:10 -080030extern void *gdb_vbr_vector;
31
kogiidena9d441902006-01-16 22:14:10 -080032void machine_shutdown(void)
33{
34}
35
36void 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 */
45int machine_kexec_prepare(struct kimage *image)
46{
47 return 0;
48}
49
50void machine_kexec_cleanup(struct kimage *image)
51{
52}
53
54static 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,
Paul Mundt4d5ade52007-04-27 11:25:57 +090062 (unsigned int)image->segment[i].mem +
63 image->segment[i].memsz,
kogiidena9d441902006-01-16 22:14:10 -080064 (unsigned int)image->segment[i].memsz);
Paul Mundt4d5ade52007-04-27 11:25:57 +090065 }
kogiidena9d441902006-01-16 22:14:10 -080066 printk(" start : 0x%08x\n\n", (unsigned int)image->start);
67}
68
kogiidena9d441902006-01-16 22:14:10 -080069/*
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 */
73NORET_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;
Paul Mundt4d5ade52007-04-27 11:25:57 +0900104 (*rnk)(page_list, reboot_code_buffer, image->start, vbr_reg);
kogiidena9d441902006-01-16 22:14:10 -0800105}
106