summaryrefslogtreecommitdiffstats
path: root/kernel/arch/microblaze/lib/memmove.c
diff options
context:
space:
mode:
authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/microblaze/lib/memmove.c
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/microblaze/lib/memmove.c')
-rw-r--r--kernel/arch/microblaze/lib/memmove.c215
1 files changed, 215 insertions, 0 deletions
diff --git a/kernel/arch/microblaze/lib/memmove.c b/kernel/arch/microblaze/lib/memmove.c
new file mode 100644
index 000000000..3611ce704
--- /dev/null
+++ b/kernel/arch/microblaze/lib/memmove.c
@@ -0,0 +1,215 @@
+/*
+ * 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 memcpy on Microblaze
+ * This is generic C code to do efficient, alignment-aware memmove.
+ *
+ * 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, unsuccessfully, 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/export.h>
+#include <linux/types.h>
+#include <linux/stddef.h>
+#include <linux/compiler.h>
+#include <linux/string.h>
+
+#ifdef __HAVE_ARCH_MEMMOVE
+#ifndef CONFIG_OPT_LIB_FUNCTION
+void *memmove(void *v_dst, const void *v_src, __kernel_size_t c)
+{
+ const char *src = v_src;
+ char *dst = v_dst;
+
+ if (!c)
+ return v_dst;
+
+ /* Use memcpy when source is higher than dest */
+ if (v_dst <= v_src)
+ return memcpy(v_dst, v_src, c);
+
+ /* copy backwards, from end to beginning */
+ src += c;
+ dst += c;
+
+ /* Simple, byte oriented memmove. */
+ while (c--)
+ *--dst = *--src;
+
+ return v_dst;
+}
+#else /* CONFIG_OPT_LIB_FUNCTION */
+void *memmove(void *v_dst, const void *v_src, __kernel_size_t c)
+{
+ const char *src = v_src;
+ char *dst = v_dst;
+ const uint32_t *i_src;
+ uint32_t *i_dst;
+
+ if (!c)
+ return v_dst;
+
+ /* Use memcpy when source is higher than dest */
+ if (v_dst <= v_src)
+ return memcpy(v_dst, v_src, c);
+
+ /* The following code tries to optimize the copy by using unsigned
+ * alignment. This will work fine if both source and destination are
+ * aligned on the same boundary. However, if they are aligned on
+ * different boundaries shifts will be necessary. This might result in
+ * bad performance on MicroBlaze systems without a barrel shifter.
+ */
+ /* FIXME this part needs more test */
+ /* Do a descending copy - this is a bit trickier! */
+ dst += c;
+ src += c;
+
+ if (c >= 4) {
+ unsigned value, buf_hold;
+
+ /* Align the destination to a word boundary. */
+ /* This is done in an endian independent manner. */
+
+ switch ((unsigned long)dst & 3) {
+ case 3:
+ *--dst = *--src;
+ --c;
+ case 2:
+ *--dst = *--src;
+ --c;
+ case 1:
+ *--dst = *--src;
+ --c;
+ }
+
+ i_dst = (void *)dst;
+ /* Choose a copy scheme based on the source */
+ /* alignment relative to dstination. */
+ switch ((unsigned long)src & 3) {
+ case 0x0: /* Both byte offsets are aligned */
+
+ i_src = (const void *)src;
+
+ for (; c >= 4; c -= 4)
+ *--i_dst = *--i_src;
+
+ src = (const void *)i_src;
+ break;
+ case 0x1: /* Unaligned - Off by 1 */
+ /* Word align the source */
+ i_src = (const void *) (((unsigned)src + 4) & ~3);
+#ifndef __MICROBLAZEEL__
+ /* Load the holding buffer */
+ buf_hold = *--i_src >> 24;
+
+ for (; c >= 4; c -= 4) {
+ value = *--i_src;
+ *--i_dst = buf_hold << 8 | value;
+ buf_hold = value >> 24;
+ }
+#else
+ /* Load the holding buffer */
+ buf_hold = (*--i_src & 0xFF) << 24;
+
+ for (; c >= 4; c -= 4) {
+ value = *--i_src;
+ *--i_dst = buf_hold |
+ ((value & 0xFFFFFF00) >> 8);
+ buf_hold = (value & 0xFF) << 24;
+ }
+#endif
+ /* Realign the source */
+ src = (const void *)i_src;
+ src += 1;
+ break;
+ case 0x2: /* Unaligned - Off by 2 */
+ /* Word align the source */
+ i_src = (const void *) (((unsigned)src + 4) & ~3);
+#ifndef __MICROBLAZEEL__
+ /* Load the holding buffer */
+ buf_hold = *--i_src >> 16;
+
+ for (; c >= 4; c -= 4) {
+ value = *--i_src;
+ *--i_dst = buf_hold << 16 | value;
+ buf_hold = value >> 16;
+ }
+#else
+ /* Load the holding buffer */
+ buf_hold = (*--i_src & 0xFFFF) << 16;
+
+ for (; c >= 4; c -= 4) {
+ value = *--i_src;
+ *--i_dst = buf_hold |
+ ((value & 0xFFFF0000) >> 16);
+ buf_hold = (value & 0xFFFF) << 16;
+ }
+#endif
+ /* Realign the source */
+ src = (const void *)i_src;
+ src += 2;
+ break;
+ case 0x3: /* Unaligned - Off by 3 */
+ /* Word align the source */
+ i_src = (const void *) (((unsigned)src + 4) & ~3);
+#ifndef __MICROBLAZEEL__
+ /* Load the holding buffer */
+ buf_hold = *--i_src >> 8;
+
+ for (; c >= 4; c -= 4) {
+ value = *--i_src;
+ *--i_dst = buf_hold << 24 | value;
+ buf_hold = value >> 8;
+ }
+#else
+ /* Load the holding buffer */
+ buf_hold = (*--i_src & 0xFFFFFF) << 8;
+
+ for (; c >= 4; c -= 4) {
+ value = *--i_src;
+ *--i_dst = buf_hold |
+ ((value & 0xFF000000) >> 24);
+ buf_hold = (value & 0xFFFFFF) << 8;
+ }
+#endif
+ /* Realign the source */
+ src = (const void *)i_src;
+ src += 3;
+ break;
+ }
+ dst = (void *)i_dst;
+ }
+
+ /* simple fast copy, ... unless a cache boundary is crossed */
+ /* Finish off any remaining bytes */
+ switch (c) {
+ case 4:
+ *--dst = *--src;
+ case 3:
+ *--dst = *--src;
+ case 2:
+ *--dst = *--src;
+ case 1:
+ *--dst = *--src;
+ }
+ return v_dst;
+}
+#endif /* CONFIG_OPT_LIB_FUNCTION */
+EXPORT_SYMBOL(memmove);
+#endif /* __HAVE_ARCH_MEMMOVE */