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-rw-r--r--arch/x86/lib/iomem.c42
1 files changed, 42 insertions, 0 deletions
diff --git a/arch/x86/lib/iomem.c b/arch/x86/lib/iomem.c
new file mode 100644
index 000000000000..66894675f3c8
--- /dev/null
+++ b/arch/x86/lib/iomem.c
@@ -0,0 +1,42 @@
+#include <linux/string.h>
+#include <linux/module.h>
+#include <linux/io.h>
+
+/* Originally from i386/string.h */
+static __always_inline void __iomem_memcpy(void *to, const void *from, size_t n)
+{
+ unsigned long d0, d1, d2;
+ asm volatile("rep ; movsl\n\t"
+ "testb $2,%b4\n\t"
+ "je 1f\n\t"
+ "movsw\n"
+ "1:\ttestb $1,%b4\n\t"
+ "je 2f\n\t"
+ "movsb\n"
+ "2:"
+ : "=&c" (d0), "=&D" (d1), "=&S" (d2)
+ : "0" (n / 4), "q" (n), "1" ((long)to), "2" ((long)from)
+ : "memory");
+}
+
+void memcpy_fromio(void *to, const volatile void __iomem *from, size_t n)
+{
+ __iomem_memcpy(to, (const void *)from, n);
+}
+EXPORT_SYMBOL(memcpy_fromio);
+
+void memcpy_toio(volatile void __iomem *to, const void *from, size_t n)
+{
+ __iomem_memcpy((void *)to, (const void *) from, n);
+}
+EXPORT_SYMBOL(memcpy_toio);
+
+void memset_io(volatile void __iomem *a, int b, size_t c)
+{
+ /*
+ * TODO: memset can mangle the IO patterns quite a bit.
+ * perhaps it would be better to use a dumb one:
+ */
+ memset((void *)a, b, c);
+}
+EXPORT_SYMBOL(memset_io);