From 849369d6c66d3054688672f97d31fceb8e8230fb Mon Sep 17 00:00:00 2001
From: root <root@artemis.panaceas.org>
Date: Fri, 25 Dec 2015 04:40:36 +0000
Subject: initial_commit

---
 arch/arm/kernel/io.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 arch/arm/kernel/io.c

(limited to 'arch/arm/kernel/io.c')

diff --git a/arch/arm/kernel/io.c b/arch/arm/kernel/io.c
new file mode 100644
index 00000000..f4470307
--- /dev/null
+++ b/arch/arm/kernel/io.c
@@ -0,0 +1,50 @@
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/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, 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(volatile 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(volatile 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);
-- 
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