1 files changed, 43 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/smp_plat.h b/arch/arm64/include/asm/smp_plat.h
new file mode 100644
index 000000000..99ad77df8
--- /dev/null
+++ b/arch/arm64/include/asm/smp_plat.h
@@ -0,0 +1,43 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Definitions specific to SMP platforms.
+ *
+ * Copyright (C) 2013 ARM Ltd.
+ */
+
+#ifndef __ASM_SMP_PLAT_H
+#define __ASM_SMP_PLAT_H
+
+#include <linux/cpumask.h>
+
+#include <asm/types.h>
+
+struct mpidr_hash {
+	u64	mask;
+	u32	shift_aff[4];
+	u32	bits;
+};
+
+extern struct mpidr_hash mpidr_hash;
+
+static inline u32 mpidr_hash_size(void)
+{
+	return 1 << mpidr_hash.bits;
+}
+
+/*
+ * Retrieve logical cpu index corresponding to a given MPIDR.Aff*
+ *  - mpidr: MPIDR.Aff* bits to be used for the look-up
+ *
+ * Returns the cpu logical index or -EINVAL on look-up error
+ */
+static inline int get_logical_index(u64 mpidr)
+{
+	int cpu;
+	for (cpu = 0; cpu < nr_cpu_ids; cpu++)
+		if (cpu_logical_map(cpu) == mpidr)
+			return cpu;
+	return -EINVAL;
+}
+
+#endif /* __ASM_SMP_PLAT_H */