2 * machine_kexec.c for kexec
3 * Created by <nschichan@corp.free.fr> on Thu Oct 12 15:15:06 2006
5 * This source code is licensed under the GNU General Public License,
6 * Version 2. See the file COPYING for more details.
8 #include <linux/compiler.h>
9 #include <linux/kexec.h>
11 #include <linux/delay.h>
13 #include <asm/cacheflush.h>
16 extern const unsigned char relocate_new_kernel[];
17 extern const size_t relocate_new_kernel_size;
19 extern unsigned long kexec_start_address;
20 extern unsigned long kexec_indirection_page;
22 int (*_machine_kexec_prepare)(struct kimage *) = NULL;
23 void (*_machine_kexec_shutdown)(void) = NULL;
24 void (*_machine_crash_shutdown)(struct pt_regs *regs) = NULL;
26 void (*relocated_kexec_smp_wait) (void *);
27 atomic_t kexec_ready_to_reboot = ATOMIC_INIT(0);
28 void (*_crash_smp_send_stop)(void) = NULL;
32 machine_kexec_prepare(struct kimage *kimage)
34 if (_machine_kexec_prepare)
35 return _machine_kexec_prepare(kimage);
40 machine_kexec_cleanup(struct kimage *kimage)
45 machine_shutdown(void)
47 if (_machine_kexec_shutdown)
48 _machine_kexec_shutdown();
52 machine_crash_shutdown(struct pt_regs *regs)
54 if (_machine_crash_shutdown)
55 _machine_crash_shutdown(regs);
57 default_machine_crash_shutdown(regs);
60 typedef void (*noretfun_t)(void) __noreturn;
63 machine_kexec(struct kimage *image)
65 unsigned long reboot_code_buffer;
70 (unsigned long)page_address(image->control_code_page);
73 (unsigned long) phys_to_virt(image->start);
75 if (image->type == KEXEC_TYPE_DEFAULT) {
76 kexec_indirection_page =
77 (unsigned long) phys_to_virt(image->head & PAGE_MASK);
79 kexec_indirection_page = (unsigned long)&image->head;
82 memcpy((void*)reboot_code_buffer, relocate_new_kernel,
83 relocate_new_kernel_size);
86 * The generic kexec code builds a page list with physical
87 * addresses. they are directly accessible through KSEG0 (or
88 * CKSEG0 or XPHYS if on 64bit system), hence the
89 * phys_to_virt() call.
91 for (ptr = &image->head; (entry = *ptr) && !(entry &IND_DONE);
92 ptr = (entry & IND_INDIRECTION) ?
93 phys_to_virt(entry & PAGE_MASK) : ptr + 1) {
94 if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
95 *ptr & IND_DESTINATION)
96 *ptr = (unsigned long) phys_to_virt(*ptr);
99 /* Mark offline BEFORE disabling local irq. */
100 set_cpu_online(smp_processor_id(), false);
103 * we do not want to be bothered.
107 printk("Will call new kernel at %08lx\n", image->start);
111 /* All secondary cpus now may jump to kexec_wait cycle */
112 relocated_kexec_smp_wait = reboot_code_buffer +
113 (void *)(kexec_smp_wait - relocate_new_kernel);
115 atomic_set(&kexec_ready_to_reboot, 1);
117 ((noretfun_t) reboot_code_buffer)();