1 files changed, 51 insertions, 0 deletions

diff --git a/arch/arm/kernel/io.c b/arch/arm/kernel/io.c
new file mode 100644
index 000000000000..6c20c1188b60
--- /dev/null
+++ b/arch/arm/kernel/io.c
@@ -0,0 +1,51 @@
+#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, void __iomem *from, size_t count)
+{
+        unsigned char *t = to;
+        while (count) {
+                count--;
+                *t = readb(from);
+                t++;
+                from++;
+        }
+}
+
+/*
+ * Copy data from "real" memory space to IO memory space.
+ * This needs to be optimized.
+ */
+void _memcpy_toio(void __iomem *to, const void *from, size_t count)
+{
+        const unsigned char *f = from;
+        while (count) {
+                count--;
+                writeb(*f, to);
+                f++;
+                to++;
+        }
+}
+
+/*
+ * "memset" on IO memory space.
+ * This needs to be optimized.
+ */
+void _memset_io(void __iomem *dst, int c, size_t count)
+{
+        while (count) {
+                count--;
+                writeb(c, dst);
+                dst++;
+        }
+}
+
+EXPORT_SYMBOL(_memcpy_fromio);
+EXPORT_SYMBOL(_memcpy_toio);
+EXPORT_SYMBOL(_memset_io);