2 * machine_kexec.c - handle transition of Linux booting another kernel
3 * Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com>
5 * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
6 * LANDISK/sh4 supported by kogiidena
8 * This source code is licensed under the GNU General Public License,
9 * Version 2. See the file COPYING for more details.
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>
20 #include <asm/cacheflush.h>
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;
28 const extern unsigned char relocate_new_kernel[];
29 const extern unsigned int relocate_new_kernel_size;
30 extern void *gdb_vbr_vector;
33 * Provide a dummy crash_notes definition while crash dump arrives to ppc.
34 * This prevents breakage of crash_notes attribute in kernel/ksysfs.c.
36 void *crash_notes = NULL;
38 void machine_shutdown(void)
42 void machine_crash_shutdown(struct pt_regs *regs)
47 * Do what every setup is needed on image and the
48 * reboot code buffer to allow us to avoid allocations
51 int machine_kexec_prepare(struct kimage *image)
56 void machine_kexec_cleanup(struct kimage *image)
60 static void kexec_info(struct kimage *image)
63 printk("kexec information\n");
64 for (i = 0; i < image->nr_segments; i++) {
65 printk(" segment[%d]: 0x%08x - 0x%08x (0x%08x)\n",
67 (unsigned int)image->segment[i].mem,
68 (unsigned int)image->segment[i].mem + image->segment[i].memsz,
69 (unsigned int)image->segment[i].memsz);
71 printk(" start : 0x%08x\n\n", (unsigned int)image->start);
76 * Do not allocate memory (or fail in any way) in machine_kexec().
77 * We are past the point of no return, committed to rebooting now.
79 NORET_TYPE void machine_kexec(struct kimage *image)
82 unsigned long page_list;
83 unsigned long reboot_code_buffer;
84 unsigned long vbr_reg;
85 relocate_new_kernel_t rnk;
87 #if defined(CONFIG_SH_STANDARD_BIOS)
88 vbr_reg = ((unsigned long )gdb_vbr_vector) - 0x100;
90 vbr_reg = 0x80000000; // dummy
92 /* Interrupts aren't acceptable while we reboot */
95 page_list = image->head;
97 /* we need both effective and real address here */
99 (unsigned long)page_address(image->control_code_page);
101 /* copy our kernel relocation code to the control code page */
102 memcpy((void *)reboot_code_buffer, relocate_new_kernel,
103 relocate_new_kernel_size);
109 rnk = (relocate_new_kernel_t) reboot_code_buffer;
110 (*rnk)(page_list, reboot_code_buffer, image->start, vbr_reg);