v4.19.13 snapshot.
diff --git a/arch/mips/kernel/machine_kexec.c b/arch/mips/kernel/machine_kexec.c
new file mode 100644
index 0000000..4b3726e
--- /dev/null
+++ b/arch/mips/kernel/machine_kexec.c
@@ -0,0 +1,140 @@
+/*
+ * machine_kexec.c for kexec
+ * Created by <nschichan@corp.free.fr> on Thu Oct 12 15:15:06 2006
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2. See the file COPYING for more details.
+ */
+#include <linux/compiler.h>
+#include <linux/kexec.h>
+#include <linux/mm.h>
+#include <linux/delay.h>
+
+#include <asm/cacheflush.h>
+#include <asm/page.h>
+
+extern const unsigned char relocate_new_kernel[];
+extern const size_t relocate_new_kernel_size;
+
+extern unsigned long kexec_start_address;
+extern unsigned long kexec_indirection_page;
+
+int (*_machine_kexec_prepare)(struct kimage *) = NULL;
+void (*_machine_kexec_shutdown)(void) = NULL;
+void (*_machine_crash_shutdown)(struct pt_regs *regs) = NULL;
+#ifdef CONFIG_SMP
+void (*relocated_kexec_smp_wait) (void *);
+atomic_t kexec_ready_to_reboot = ATOMIC_INIT(0);
+void (*_crash_smp_send_stop)(void) = NULL;
+#endif
+
+static void kexec_image_info(const struct kimage *kimage)
+{
+ unsigned long i;
+
+ pr_debug("kexec kimage info:\n");
+ pr_debug(" type: %d\n", kimage->type);
+ pr_debug(" start: %lx\n", kimage->start);
+ pr_debug(" head: %lx\n", kimage->head);
+ pr_debug(" nr_segments: %lu\n", kimage->nr_segments);
+
+ for (i = 0; i < kimage->nr_segments; i++) {
+ pr_debug(" segment[%lu]: %016lx - %016lx, 0x%lx bytes, %lu pages\n",
+ i,
+ kimage->segment[i].mem,
+ kimage->segment[i].mem + kimage->segment[i].memsz,
+ (unsigned long)kimage->segment[i].memsz,
+ (unsigned long)kimage->segment[i].memsz / PAGE_SIZE);
+ }
+}
+
+int
+machine_kexec_prepare(struct kimage *kimage)
+{
+ kexec_image_info(kimage);
+
+ if (_machine_kexec_prepare)
+ return _machine_kexec_prepare(kimage);
+ return 0;
+}
+
+void
+machine_kexec_cleanup(struct kimage *kimage)
+{
+}
+
+void
+machine_shutdown(void)
+{
+ if (_machine_kexec_shutdown)
+ _machine_kexec_shutdown();
+}
+
+void
+machine_crash_shutdown(struct pt_regs *regs)
+{
+ if (_machine_crash_shutdown)
+ _machine_crash_shutdown(regs);
+ else
+ default_machine_crash_shutdown(regs);
+}
+
+typedef void (*noretfun_t)(void) __noreturn;
+
+void
+machine_kexec(struct kimage *image)
+{
+ unsigned long reboot_code_buffer;
+ unsigned long entry;
+ unsigned long *ptr;
+
+ reboot_code_buffer =
+ (unsigned long)page_address(image->control_code_page);
+
+ kexec_start_address =
+ (unsigned long) phys_to_virt(image->start);
+
+ if (image->type == KEXEC_TYPE_DEFAULT) {
+ kexec_indirection_page =
+ (unsigned long) phys_to_virt(image->head & PAGE_MASK);
+ } else {
+ kexec_indirection_page = (unsigned long)&image->head;
+ }
+
+ memcpy((void*)reboot_code_buffer, relocate_new_kernel,
+ relocate_new_kernel_size);
+
+ /*
+ * The generic kexec code builds a page list with physical
+ * addresses. they are directly accessible through KSEG0 (or
+ * CKSEG0 or XPHYS if on 64bit system), hence the
+ * phys_to_virt() call.
+ */
+ for (ptr = &image->head; (entry = *ptr) && !(entry &IND_DONE);
+ ptr = (entry & IND_INDIRECTION) ?
+ phys_to_virt(entry & PAGE_MASK) : ptr + 1) {
+ if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
+ *ptr & IND_DESTINATION)
+ *ptr = (unsigned long) phys_to_virt(*ptr);
+ }
+
+ /* Mark offline BEFORE disabling local irq. */
+ set_cpu_online(smp_processor_id(), false);
+
+ /*
+ * we do not want to be bothered.
+ */
+ local_irq_disable();
+
+ printk("Will call new kernel at %08lx\n", image->start);
+ printk("Bye ...\n");
+ __flush_cache_all();
+#ifdef CONFIG_SMP
+ /* All secondary cpus now may jump to kexec_wait cycle */
+ relocated_kexec_smp_wait = reboot_code_buffer +
+ (void *)(kexec_smp_wait - relocate_new_kernel);
+ smp_wmb();
+ atomic_set(&kexec_ready_to_reboot, 1);
+#endif
+ ((noretfun_t) reboot_code_buffer)();
+}