1 files changed, 32 insertions, 0 deletions
diff --git a/include/io-64-nonatomic-lo-hi.h b/include/io-64-nonatomic-lo-hi.h
new file mode 100644
index 0000000000..62b4022794
--- /dev/null
+++ b/include/io-64-nonatomic-lo-hi.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_IO_64_NONATOMIC_LO_HI_H_
+#define _LINUX_IO_64_NONATOMIC_LO_HI_H_
+
+#include <io.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	/* _LINUX_IO_64_NONATOMIC_LO_HI_H_ */