Introduce an x86_64-specific memcpy32 routine. The routine is similar
to memcpy, but is guaranteed to work in units of 32 bits at a time.
Signed-off-by: Bryan O'Sullivan <[email protected]>
diff -r d286502c3b3c -r 33790477a163 arch/x86_64/kernel/x8664_ksyms.c
--- a/arch/x86_64/kernel/x8664_ksyms.c Fri Jan 6 12:25:00 2006 -0800
+++ b/arch/x86_64/kernel/x8664_ksyms.c Fri Jan 6 12:25:02 2006 -0800
@@ -164,6 +164,8 @@
EXPORT_SYMBOL(memcpy);
EXPORT_SYMBOL(__memcpy);
+EXPORT_SYMBOL_GPL(memcpy32);
+
#ifdef CONFIG_RWSEM_XCHGADD_ALGORITHM
/* prototypes are wrong, these are assembly with custom calling functions */
extern void rwsem_down_read_failed_thunk(void);
diff -r d286502c3b3c -r 33790477a163 arch/x86_64/lib/Makefile
--- a/arch/x86_64/lib/Makefile Fri Jan 6 12:25:00 2006 -0800
+++ b/arch/x86_64/lib/Makefile Fri Jan 6 12:25:02 2006 -0800
@@ -9,4 +9,4 @@
lib-y := csum-partial.o csum-copy.o csum-wrappers.o delay.o \
usercopy.o getuser.o putuser.o \
thunk.o clear_page.o copy_page.o bitstr.o bitops.o
-lib-y += memcpy.o memmove.o memset.o copy_user.o
+lib-y += memcpy.o memcpy32.o memmove.o memset.o copy_user.o
diff -r d286502c3b3c -r 33790477a163 include/asm-x86_64/string.h
--- a/include/asm-x86_64/string.h Fri Jan 6 12:25:00 2006 -0800
+++ b/include/asm-x86_64/string.h Fri Jan 6 12:25:02 2006 -0800
@@ -45,6 +45,15 @@
#define __HAVE_ARCH_MEMMOVE
void * memmove(void * dest,const void *src,size_t count);
+/*
+ * memcpy32 - copy data, 32 bits at a time
+ *
+ * @dst: destination (must be 32-bit aligned)
+ * @src: source (must be 32-bit aligned)
+ * @count: number of 32-bit quantities to copy
+ */
+void memcpy32(void *dst, const void *src, size_t count);
+
/* Use C out of line version for memcmp */
#define memcmp __builtin_memcmp
int memcmp(const void * cs,const void * ct,size_t count);
diff -r d286502c3b3c -r 33790477a163 arch/x86_64/lib/memcpy32.S
--- /dev/null Thu Jan 1 00:00:00 1970 +0000
+++ b/arch/x86_64/lib/memcpy32.S Fri Jan 6 12:25:02 2006 -0800
@@ -0,0 +1,36 @@
+/*
+ * Copyright 2006 PathScale, Inc. All Rights Reserved.
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+/*
+ * memcpy32 - Copy a memory block, 32 bits at a time.
+ *
+ * This routine does not return anything.
+ * Input:
+ * rdi destination
+ * rsi source
+ * rdx count (32-bit quantities to copy)
+ */
+
+ .globl memcpy32
+memcpy32:
+ movl %edx,%ecx
+ shrl $1,%ecx
+ andl $1,%edx
+ rep movsq
+ movl %edx,%ecx
+ rep movsd
+ ret
-
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