1 files changed, 32 insertions, 0 deletions
diff --git a/kernel/include/asm-generic/io-64-nonatomic-lo-hi.h b/kernel/include/asm-generic/io-64-nonatomic-lo-hi.h
new file mode 100644
index 000000000..0efacff0a
--- /dev/null
+++ b/kernel/include/asm-generic/io-64-nonatomic-lo-hi.h
@@ -0,0 +1,32 @@
+#ifndef _ASM_IO_64_NONATOMIC_LO_HI_H_
+#define _ASM_IO_64_NONATOMIC_LO_HI_H_
+
+#include <linux/io.h>
+#include <asm-generic/int-ll64.h>
+
+static inline __u64 lo_hi_readq(const volatile void __iomem *addr)
+{
+	const volatile u32 __iomem *p = addr;
+	u32 low, high;
+
+	low = readl(p);
+	high = readl(p + 1);
+
+	return low + ((u64)high << 32);
+}
+
+static inline void lo_hi_writeq(__u64 val, volatile void __iomem *addr)
+{
+	writel(val, addr);
+	writel(val >> 32, addr + 4);
+}
+
+#ifndef readq
+#define readq lo_hi_readq
+#endif
+
+#ifndef writeq
+#define writeq lo_hi_writeq
+#endif
+
+#endif	/* _ASM_IO_64_NONATOMIC_LO_HI_H_ */