v4.19.13 snapshot.
diff --git a/arch/sh/kernel/machine_kexec.c b/arch/sh/kernel/machine_kexec.c
new file mode 100644
index 0000000..9fea49f
--- /dev/null
+++ b/arch/sh/kernel/machine_kexec.c
@@ -0,0 +1,207 @@
+/*
+ * machine_kexec.c - handle transition of Linux booting another kernel
+ * Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com>
+ *
+ * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
+ * LANDISK/sh4 supported by kogiidena
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2. See the file COPYING for more details.
+ */
+#include <linux/mm.h>
+#include <linux/kexec.h>
+#include <linux/delay.h>
+#include <linux/reboot.h>
+#include <linux/numa.h>
+#include <linux/ftrace.h>
+#include <linux/suspend.h>
+#include <linux/memblock.h>
+#include <asm/pgtable.h>
+#include <asm/pgalloc.h>
+#include <asm/mmu_context.h>
+#include <asm/io.h>
+#include <asm/cacheflush.h>
+#include <asm/sh_bios.h>
+#include <asm/reboot.h>
+
+typedef void (*relocate_new_kernel_t)(unsigned long indirection_page,
+ unsigned long reboot_code_buffer,
+ unsigned long start_address);
+
+extern const unsigned char relocate_new_kernel[];
+extern const unsigned int relocate_new_kernel_size;
+extern void *vbr_base;
+
+void native_machine_crash_shutdown(struct pt_regs *regs)
+{
+ /* Nothing to do for UP, but definitely broken for SMP.. */
+}
+
+/*
+ * Do what every setup is needed on image and the
+ * reboot code buffer to allow us to avoid allocations
+ * later.
+ */
+int machine_kexec_prepare(struct kimage *image)
+{
+ return 0;
+}
+
+void machine_kexec_cleanup(struct kimage *image)
+{
+}
+
+static void kexec_info(struct kimage *image)
+{
+ int i;
+ printk("kexec information\n");
+ for (i = 0; i < image->nr_segments; i++) {
+ printk(" segment[%d]: 0x%08x - 0x%08x (0x%08x)\n",
+ i,
+ (unsigned int)image->segment[i].mem,
+ (unsigned int)image->segment[i].mem +
+ image->segment[i].memsz,
+ (unsigned int)image->segment[i].memsz);
+ }
+ printk(" start : 0x%08x\n\n", (unsigned int)image->start);
+}
+
+/*
+ * Do not allocate memory (or fail in any way) in machine_kexec().
+ * We are past the point of no return, committed to rebooting now.
+ */
+void machine_kexec(struct kimage *image)
+{
+ unsigned long page_list;
+ unsigned long reboot_code_buffer;
+ relocate_new_kernel_t rnk;
+ unsigned long entry;
+ unsigned long *ptr;
+ int save_ftrace_enabled;
+
+ /*
+ * Nicked from the mips version of machine_kexec():
+ * The generic kexec code builds a page list with physical
+ * addresses. Use phys_to_virt() to convert them to virtual.
+ */
+ 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);
+ }
+
+#ifdef CONFIG_KEXEC_JUMP
+ if (image->preserve_context)
+ save_processor_state();
+#endif
+
+ save_ftrace_enabled = __ftrace_enabled_save();
+
+ /* Interrupts aren't acceptable while we reboot */
+ local_irq_disable();
+
+ page_list = image->head;
+
+ /* we need both effective and real address here */
+ reboot_code_buffer =
+ (unsigned long)page_address(image->control_code_page);
+
+ /* copy our kernel relocation code to the control code page */
+ memcpy((void *)reboot_code_buffer, relocate_new_kernel,
+ relocate_new_kernel_size);
+
+ kexec_info(image);
+ flush_cache_all();
+
+ sh_bios_vbr_reload();
+
+ /* now call it */
+ rnk = (relocate_new_kernel_t) reboot_code_buffer;
+ (*rnk)(page_list, reboot_code_buffer,
+ (unsigned long)phys_to_virt(image->start));
+
+#ifdef CONFIG_KEXEC_JUMP
+ asm volatile("ldc %0, vbr" : : "r" (&vbr_base) : "memory");
+
+ if (image->preserve_context)
+ restore_processor_state();
+
+ /* Convert page list back to physical addresses, what a mess. */
+ for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE);
+ ptr = (*ptr & IND_INDIRECTION) ?
+ phys_to_virt(*ptr & PAGE_MASK) : ptr + 1) {
+ if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
+ *ptr & IND_DESTINATION)
+ *ptr = virt_to_phys(*ptr);
+ }
+#endif
+
+ __ftrace_enabled_restore(save_ftrace_enabled);
+}
+
+void arch_crash_save_vmcoreinfo(void)
+{
+#ifdef CONFIG_NUMA
+ VMCOREINFO_SYMBOL(node_data);
+ VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
+#endif
+#ifdef CONFIG_X2TLB
+ VMCOREINFO_CONFIG(X2TLB);
+#endif
+}
+
+void __init reserve_crashkernel(void)
+{
+ unsigned long long crash_size, crash_base;
+ int ret;
+
+ ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
+ &crash_size, &crash_base);
+ if (ret == 0 && crash_size > 0) {
+ crashk_res.start = crash_base;
+ crashk_res.end = crash_base + crash_size - 1;
+ }
+
+ if (crashk_res.end == crashk_res.start)
+ goto disable;
+
+ crash_size = PAGE_ALIGN(resource_size(&crashk_res));
+ if (!crashk_res.start) {
+ unsigned long max = memblock_end_of_DRAM() - memory_limit;
+ crashk_res.start = __memblock_alloc_base(crash_size, PAGE_SIZE, max);
+ if (!crashk_res.start) {
+ pr_err("crashkernel allocation failed\n");
+ goto disable;
+ }
+ } else {
+ ret = memblock_reserve(crashk_res.start, crash_size);
+ if (unlikely(ret < 0)) {
+ pr_err("crashkernel reservation failed - "
+ "memory is in use\n");
+ goto disable;
+ }
+ }
+
+ crashk_res.end = crashk_res.start + crash_size - 1;
+
+ /*
+ * Crash kernel trumps memory limit
+ */
+ if ((memblock_end_of_DRAM() - memory_limit) <= crashk_res.end) {
+ memory_limit = 0;
+ pr_info("Disabled memory limit for crashkernel\n");
+ }
+
+ pr_info("Reserving %ldMB of memory at 0x%08lx "
+ "for crashkernel (System RAM: %ldMB)\n",
+ (unsigned long)(crash_size >> 20),
+ (unsigned long)(crashk_res.start),
+ (unsigned long)(memblock_phys_mem_size() >> 20));
+
+ return;
+
+disable:
+ crashk_res.start = crashk_res.end = 0;
+}