From 03dd4cb26d967f9588437b0fc9cc0e8353322bb7 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Fri, 25 Mar 2016 03:53:42 -0300
Subject: Linux-libre 4.5-gnu

---
 arch/arm64/include/asm/sysreg.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

(limited to 'arch/arm64/include/asm/sysreg.h')

diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
index d48ab5b41..4aeebec3d 100644
--- a/arch/arm64/include/asm/sysreg.h
+++ b/arch/arm64/include/asm/sysreg.h
@@ -20,6 +20,8 @@
 #ifndef __ASM_SYSREG_H
 #define __ASM_SYSREG_H
 
+#include <linux/stringify.h>
+
 #include <asm/opcodes.h>
 
 /*
@@ -208,6 +210,8 @@
 
 #else
 
+#include <linux/types.h>
+
 asm(
 "	.irp	num,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30\n"
 "	.equ	__reg_num_x\\num, \\num\n"
@@ -232,6 +236,23 @@ static inline void config_sctlr_el1(u32 clear, u32 set)
 	val |= set;
 	asm volatile("msr sctlr_el1, %0" : : "r" (val));
 }
+
+/*
+ * Unlike read_cpuid, calls to read_sysreg are never expected to be
+ * optimized away or replaced with synthetic values.
+ */
+#define read_sysreg(r) ({					\
+	u64 __val;						\
+	asm volatile("mrs %0, " __stringify(r) : "=r" (__val));	\
+	__val;							\
+})
+
+#define write_sysreg(v, r) do {					\
+	u64 __val = (u64)v;					\
+	asm volatile("msr " __stringify(r) ", %0"		\
+		     : : "r" (__val));				\
+} while (0)
+
 #endif
 
 #endif	/* __ASM_SYSREG_H */
-- 
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