1 files changed, 49 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/cputype.h b/arch/arm64/include/asm/cputype.h
new file mode 100644
index 000000000000..ef54125e6c1e
--- /dev/null
+++ b/arch/arm64/include/asm/cputype.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_CPUTYPE_H
+#define __ASM_CPUTYPE_H
+
+#define ID_MIDR_EL1		"midr_el1"
+#define ID_CTR_EL0		"ctr_el0"
+
+#define ID_AA64PFR0_EL1		"id_aa64pfr0_el1"
+#define ID_AA64DFR0_EL1		"id_aa64dfr0_el1"
+#define ID_AA64AFR0_EL1		"id_aa64afr0_el1"
+#define ID_AA64ISAR0_EL1	"id_aa64isar0_el1"
+#define ID_AA64MMFR0_EL1	"id_aa64mmfr0_el1"
+
+#define read_cpuid(reg) ({						\
+	u64 __val;							\
+	asm("mrs	%0, " reg : "=r" (__val));			\
+	__val;								\
+})
+
+/*
+ * The CPU ID never changes at run time, so we might as well tell the
+ * compiler that it's constant.  Use this function to read the CPU ID
+ * rather than directly reading processor_id or read_cpuid() directly.
+ */
+static inline u32 __attribute_const__ read_cpuid_id(void)
+{
+	return read_cpuid(ID_MIDR_EL1);
+}
+
+static inline u32 __attribute_const__ read_cpuid_cachetype(void)
+{
+	return read_cpuid(ID_CTR_EL0);
+}
+
+#endif