v4.19.13 snapshot.
diff --git a/arch/sh/include/asm/smp.h b/arch/sh/include/asm/smp.h
new file mode 100644
index 0000000..1a0d7cf
--- /dev/null
+++ b/arch/sh/include/asm/smp.h
@@ -0,0 +1,84 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_SH_SMP_H
+#define __ASM_SH_SMP_H
+
+#include <linux/bitops.h>
+#include <linux/cpumask.h>
+#include <asm/smp-ops.h>
+
+#ifdef CONFIG_SMP
+
+#include <linux/spinlock.h>
+#include <linux/atomic.h>
+#include <asm/current.h>
+#include <asm/percpu.h>
+
+#define raw_smp_processor_id() (current_thread_info()->cpu)
+
+/* Map from cpu id to sequential logical cpu number. */
+extern int __cpu_number_map[NR_CPUS];
+#define cpu_number_map(cpu) __cpu_number_map[cpu]
+
+/* The reverse map from sequential logical cpu number to cpu id. */
+extern int __cpu_logical_map[NR_CPUS];
+#define cpu_logical_map(cpu) __cpu_logical_map[cpu]
+
+enum {
+ SMP_MSG_FUNCTION,
+ SMP_MSG_RESCHEDULE,
+ SMP_MSG_FUNCTION_SINGLE,
+ SMP_MSG_TIMER,
+
+ SMP_MSG_NR, /* must be last */
+};
+
+DECLARE_PER_CPU(int, cpu_state);
+
+void smp_message_recv(unsigned int msg);
+
+void arch_send_call_function_single_ipi(int cpu);
+void arch_send_call_function_ipi_mask(const struct cpumask *mask);
+
+void native_play_dead(void);
+void native_cpu_die(unsigned int cpu);
+int native_cpu_disable(unsigned int cpu);
+
+#ifdef CONFIG_HOTPLUG_CPU
+void play_dead_common(void);
+extern int __cpu_disable(void);
+
+static inline void __cpu_die(unsigned int cpu)
+{
+ extern struct plat_smp_ops *mp_ops; /* private */
+
+ mp_ops->cpu_die(cpu);
+}
+#endif
+
+static inline int hard_smp_processor_id(void)
+{
+ extern struct plat_smp_ops *mp_ops; /* private */
+
+ if (!mp_ops)
+ return 0; /* boot CPU */
+
+ return mp_ops->smp_processor_id();
+}
+
+struct of_cpu_method {
+ const char *method;
+ struct plat_smp_ops *ops;
+};
+
+#define CPU_METHOD_OF_DECLARE(name, _method, _ops) \
+ static const struct of_cpu_method __cpu_method_of_table_##name \
+ __used __section(__cpu_method_of_table) \
+ = { .method = _method, .ops = _ops }
+
+#else
+
+#define hard_smp_processor_id() (0)
+
+#endif /* CONFIG_SMP */
+
+#endif /* __ASM_SH_SMP_H */