1 files changed, 107 insertions, 0 deletions
diff --git a/arch/c6x/include/asm/uaccess.h b/arch/c6x/include/asm/uaccess.h
new file mode 100644
index 00000000000..453dd263bee
--- /dev/null
+++ b/arch/c6x/include/asm/uaccess.h
@@ -0,0 +1,107 @@
+/*
+ *  Copyright (C) 2011 Texas Instruments Incorporated
+ *  Author: Mark Salter <msalter@redhat.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ */
+#ifndef _ASM_C6X_UACCESS_H
+#define _ASM_C6X_UACCESS_H
+
+#include <linux/types.h>
+#include <linux/compiler.h>
+#include <linux/string.h>
+
+#ifdef CONFIG_ACCESS_CHECK
+#define __access_ok _access_ok
+#endif
+
+/*
+ * __copy_from_user/copy_to_user are based on ones in asm-generic/uaccess.h
+ *
+ * C6X supports unaligned 32 and 64 bit loads and stores.
+ */
+static inline __must_check long __copy_from_user(void *to,
+		const void __user *from, unsigned long n)
+{
+	u32 tmp32;
+	u64 tmp64;
+
+	if (__builtin_constant_p(n)) {
+		switch (n) {
+		case 1:
+			*(u8 *)to = *(u8 __force *)from;
+			return 0;
+		case 4:
+			asm volatile ("ldnw .d1t1 *%2,%0\n"
+				      "nop  4\n"
+				      "stnw .d1t1 %0,*%1\n"
+				      : "=&a"(tmp32)
+				      : "A"(to), "a"(from)
+				      : "memory");
+			return 0;
+		case 8:
+			asm volatile ("ldndw .d1t1 *%2,%0\n"
+				      "nop   4\n"
+				      "stndw .d1t1 %0,*%1\n"
+				      : "=&a"(tmp64)
+				      : "a"(to), "a"(from)
+				      : "memory");
+			return 0;
+		default:
+			break;
+		}
+	}
+
+	memcpy(to, (const void __force *)from, n);
+	return 0;
+}
+
+static inline __must_check long __copy_to_user(void __user *to,
+		const void *from, unsigned long n)
+{
+	u32 tmp32;
+	u64 tmp64;
+
+	if (__builtin_constant_p(n)) {
+		switch (n) {
+		case 1:
+			*(u8 __force *)to = *(u8 *)from;
+			return 0;
+		case 4:
+			asm volatile ("ldnw .d1t1 *%2,%0\n"
+				      "nop  4\n"
+				      "stnw .d1t1 %0,*%1\n"
+				      : "=&a"(tmp32)
+				      : "a"(to), "a"(from)
+				      : "memory");
+			return 0;
+		case 8:
+			asm volatile ("ldndw .d1t1 *%2,%0\n"
+				      "nop   4\n"
+				      "stndw .d1t1 %0,*%1\n"
+				      : "=&a"(tmp64)
+				      : "a"(to), "a"(from)
+				      : "memory");
+			return 0;
+		default:
+			break;
+		}
+	}
+
+	memcpy((void __force *)to, from, n);
+	return 0;
+}
+
+#define __copy_to_user   __copy_to_user
+#define __copy_from_user __copy_from_user
+
+extern int _access_ok(unsigned long addr, unsigned long size);
+#ifdef CONFIG_ACCESS_CHECK
+#define __access_ok _access_ok
+#endif
+
+#include <asm-generic/uaccess.h>
+
+#endif /* _ASM_C6X_UACCESS_H */