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 <linux/numa.h>
17 #include <linux/suspend.h>
18 #include <asm/pgtable.h>
19 #include <asm/pgalloc.h>
20 #include <asm/mmu_context.h>
22 #include <asm/cacheflush.h>
24 typedef void (*relocate_new_kernel_t)(unsigned long indirection_page,
25 unsigned long reboot_code_buffer,
26 unsigned long start_address);
28 extern const unsigned char relocate_new_kernel[];
29 extern const unsigned int relocate_new_kernel_size;
30 extern void *gdb_vbr_vector;
31 extern void *vbr_base;
33 void machine_shutdown(void)
37 void machine_crash_shutdown(struct pt_regs *regs)
42 * Do what every setup is needed on image and the
43 * reboot code buffer to allow us to avoid allocations
46 int machine_kexec_prepare(struct kimage *image)
51 void machine_kexec_cleanup(struct kimage *image)
55 static void kexec_info(struct kimage *image)
58 printk("kexec information\n");
59 for (i = 0; i < image->nr_segments; i++) {
60 printk(" segment[%d]: 0x%08x - 0x%08x (0x%08x)\n",
62 (unsigned int)image->segment[i].mem,
63 (unsigned int)image->segment[i].mem +
64 image->segment[i].memsz,
65 (unsigned int)image->segment[i].memsz);
67 printk(" start : 0x%08x\n\n", (unsigned int)image->start);
71 * Do not allocate memory (or fail in any way) in machine_kexec().
72 * We are past the point of no return, committed to rebooting now.
74 void machine_kexec(struct kimage *image)
76 unsigned long page_list;
77 unsigned long reboot_code_buffer;
78 relocate_new_kernel_t rnk;
83 * Nicked from the mips version of machine_kexec():
84 * The generic kexec code builds a page list with physical
85 * addresses. Use phys_to_virt() to convert them to virtual.
87 for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE);
88 ptr = (entry & IND_INDIRECTION) ?
89 phys_to_virt(entry & PAGE_MASK) : ptr + 1) {
90 if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
91 *ptr & IND_DESTINATION)
92 *ptr = (unsigned long) phys_to_virt(*ptr);
95 #ifdef CONFIG_KEXEC_JUMP
96 if (image->preserve_context)
97 save_processor_state();
100 /* Interrupts aren't acceptable while we reboot */
103 page_list = image->head;
105 /* we need both effective and real address here */
107 (unsigned long)page_address(image->control_code_page);
109 /* copy our kernel relocation code to the control code page */
110 memcpy((void *)reboot_code_buffer, relocate_new_kernel,
111 relocate_new_kernel_size);
117 #if defined(CONFIG_SH_STANDARD_BIOS)
118 asm volatile("ldc %0, vbr" :
119 : "r" (((unsigned long) gdb_vbr_vector) - 0x100)
123 rnk = (relocate_new_kernel_t) reboot_code_buffer;
124 (*rnk)(page_list, reboot_code_buffer, image->start);
126 #ifdef CONFIG_KEXEC_JUMP
127 asm volatile("ldc %0, vbr" : : "r" (&vbr_base) : "memory");
130 if (image->preserve_context)
131 restore_processor_state();
133 /* Convert page list back to physical addresses, what a mess. */
134 for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE);
135 ptr = (*ptr & IND_INDIRECTION) ?
136 phys_to_virt(*ptr & PAGE_MASK) : ptr + 1) {
137 if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
138 *ptr & IND_DESTINATION)
139 *ptr = virt_to_phys(*ptr);
144 void arch_crash_save_vmcoreinfo(void)
147 VMCOREINFO_SYMBOL(node_data);
148 VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);