microblaze_v8: supported function for memory - kernel/lib

Reviewed-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com>
Acked-by: John Linn <john.linn@xilinx.com>
Acked-by: John Williams <john.williams@petalogix.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>

1 files changed, 82 insertions, 0 deletions

diff --git a/arch/microblaze/lib/memset.c b/arch/microblaze/lib/memset.c
new file mode 100644
index 000000000000..941dc8f94b03
--- /dev/null
+++ b/arch/microblaze/lib/memset.c
@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
+ * Copyright (C) 2008-2009 PetaLogix
+ * Copyright (C) 2007 John Williams
+ *
+ * Reasonably optimised generic C-code for memset on Microblaze
+ * This is generic C code to do efficient, alignment-aware memcpy.
+ *
+ * It is based on demo code originally Copyright 2001 by Intel Corp, taken from
+ * http://www.embedded.com/showArticle.jhtml?articleID=19205567
+ *
+ * Attempts were made, unsuccesfully, to contact the original
+ * author of this code (Michael Morrow, Intel).  Below is the original
+ * copyright notice.
+ *
+ * This software has been developed by Intel Corporation.
+ * Intel specifically disclaims all warranties, express or
+ * implied, and all liability, including consequential and
+ * other indirect damages, for the use of this program, including
+ * liability for infringement of any proprietary rights,
+ * and including the warranties of merchantability and fitness
+ * for a particular purpose. Intel does not assume any
+ * responsibility for and errors which may appear in this program
+ * not any responsibility to update it.
+ */
+
+#include <linux/types.h>
+#include <linux/stddef.h>
+#include <linux/compiler.h>
+#include <linux/module.h>
+#include <linux/string.h>
+
+#ifdef __HAVE_ARCH_MEMSET
+void *memset(void *v_src, int c, __kernel_size_t n)
+{
+
+        char *src = v_src;
+#ifdef CONFIG_OPT_LIB_FUNCTION
+        uint32_t *i_src;
+        uint32_t w32;
+#endif
+        /* Truncate c to 8 bits */
+        c = (c & 0xFF);
+
+#ifdef CONFIG_OPT_LIB_FUNCTION
+        /* Make a repeating word out of it */
+        w32 = c;
+        w32 |= w32 << 8;
+        w32 |= w32 << 16;
+
+        if (n >= 4) {
+                /* Align the destination to a word boundary */
+                /* This is done in an endian independant manner */
+                switch ((unsigned) src & 3) {
+                case 1:
+                        *src++ = c;
+                        --n;
+                case 2:
+                        *src++ = c;
+                        --n;
+                case 3:
+                        *src++ = c;
+                        --n;
+                }
+
+                i_src  = (void *)src;
+
+                /* Do as many full-word copies as we can */
+                for (; n >= 4; n -= 4)
+                        *i_src++ = w32;
+
+                src  = (void *)i_src;
+        }
+#endif
+        /* Simple, byte oriented memset or the rest of count. */
+        while (n--)
+                *src++ = c;
+
+        return v_src;
+}
+EXPORT_SYMBOL(memset);
+#endif /* __HAVE_ARCH_MEMSET */