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/ftrace.h>
18 #include <linux/suspend.h>
19 #include <asm/pgtable.h>
20 #include <asm/pgalloc.h>
21 #include <asm/mmu_context.h>
23 #include <asm/cacheflush.h>
25 typedef void (*relocate_new_kernel_t)(unsigned long indirection_page,
26 unsigned long reboot_code_buffer,
27 unsigned long start_address);
29 extern const unsigned char relocate_new_kernel[];
30 extern const unsigned int relocate_new_kernel_size;
31 extern void *gdb_vbr_vector;
32 extern void *vbr_base;
34 void machine_shutdown(void)
38 void machine_crash_shutdown(struct pt_regs *regs)
43 * Do what every setup is needed on image and the
44 * reboot code buffer to allow us to avoid allocations
47 int machine_kexec_prepare(struct kimage *image)
49 /* older versions of kexec-tools are passing
50 * the zImage entry point as a virtual address.
52 if (image->start != PHYSADDR(image->start))
53 return -EINVAL; /* upgrade your kexec-tools */
58 void machine_kexec_cleanup(struct kimage *image)
62 static void kexec_info(struct kimage *image)
65 printk("kexec information\n");
66 for (i = 0; i < image->nr_segments; i++) {
67 printk(" segment[%d]: 0x%08x - 0x%08x (0x%08x)\n",
69 (unsigned int)image->segment[i].mem,
70 (unsigned int)image->segment[i].mem +
71 image->segment[i].memsz,
72 (unsigned int)image->segment[i].memsz);
74 printk(" start : 0x%08x\n\n", (unsigned int)image->start);
78 * Do not allocate memory (or fail in any way) in machine_kexec().
79 * We are past the point of no return, committed to rebooting now.
81 void machine_kexec(struct kimage *image)
83 unsigned long page_list;
84 unsigned long reboot_code_buffer;
85 relocate_new_kernel_t rnk;
88 int save_ftrace_enabled;
91 * Nicked from the mips version of machine_kexec():
92 * The generic kexec code builds a page list with physical
93 * addresses. Use phys_to_virt() to convert them to virtual.
95 for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE);
96 ptr = (entry & IND_INDIRECTION) ?
97 phys_to_virt(entry & PAGE_MASK) : ptr + 1) {
98 if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
99 *ptr & IND_DESTINATION)
100 *ptr = (unsigned long) phys_to_virt(*ptr);
103 #ifdef CONFIG_KEXEC_JUMP
104 if (image->preserve_context)
105 save_processor_state();
108 save_ftrace_enabled = __ftrace_enabled_save();
110 /* Interrupts aren't acceptable while we reboot */
113 page_list = image->head;
115 /* we need both effective and real address here */
117 (unsigned long)page_address(image->control_code_page);
119 /* copy our kernel relocation code to the control code page */
120 memcpy((void *)reboot_code_buffer, relocate_new_kernel,
121 relocate_new_kernel_size);
126 #if defined(CONFIG_SH_STANDARD_BIOS)
127 asm volatile("ldc %0, vbr" :
128 : "r" (((unsigned long) gdb_vbr_vector) - 0x100)
133 rnk = (relocate_new_kernel_t) reboot_code_buffer;
134 (*rnk)(page_list, reboot_code_buffer,
135 (unsigned long)phys_to_virt(image->start));
137 #ifdef CONFIG_KEXEC_JUMP
138 asm volatile("ldc %0, vbr" : : "r" (&vbr_base) : "memory");
140 if (image->preserve_context)
141 restore_processor_state();
143 /* Convert page list back to physical addresses, what a mess. */
144 for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE);
145 ptr = (*ptr & IND_INDIRECTION) ?
146 phys_to_virt(*ptr & PAGE_MASK) : ptr + 1) {
147 if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
148 *ptr & IND_DESTINATION)
149 *ptr = virt_to_phys(*ptr);
153 __ftrace_enabled_restore(save_ftrace_enabled);
156 void arch_crash_save_vmcoreinfo(void)
159 VMCOREINFO_SYMBOL(node_data);
160 VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);