1 files changed, 51 insertions, 0 deletions
diff --git a/arch/ia64/lib/io.c b/arch/ia64/lib/io.c
new file mode 100644
index 000000000..c3e02462e
--- /dev/null
+++ b/arch/ia64/lib/io.c
@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/module.h>
+#include <linux/types.h>
+
+#include <asm/io.h>
+
+/*
+ * Copy data from IO memory space to "real" memory space.
+ * This needs to be optimized.
+ */
+void memcpy_fromio(void *to, const volatile void __iomem *from, long count)
+{
+	char *dst = to;
+
+	while (count) {
+		count--;
+		*dst++ = readb(from++);
+	}
+}
+EXPORT_SYMBOL(memcpy_fromio);
+
+/*
+ * Copy data from "real" memory space to IO memory space.
+ * This needs to be optimized.
+ */
+void memcpy_toio(volatile void __iomem *to, const void *from, long count)
+{
+	const char *src = from;
+
+	while (count) {
+		count--;
+		writeb(*src++, to++);
+	}
+}
+EXPORT_SYMBOL(memcpy_toio);
+
+/*
+ * "memset" on IO memory space.
+ * This needs to be optimized.
+ */
+void memset_io(volatile void __iomem *dst, int c, long count)
+{
+	unsigned char ch = (char)(c & 0xff);
+
+	while (count) {
+		count--;
+		writeb(ch, dst);
+		dst++;
+	}
+}
+EXPORT_SYMBOL(memset_io);