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-rw-r--r--arch/arm/kernel/io.c51
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 00000000000..6c20c1188b6
--- /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);