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    Subject[PATCH 2 of 3] memcpy32 for x86_64
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    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 <bos@pathscale.com>

    diff -r 05b3d1af27eb -r 1052904816d7 arch/x86_64/kernel/x8664_ksyms.c
    --- a/arch/x86_64/kernel/x8664_ksyms.c Wed Jan 11 14:35:45 2006 -0800
    +++ b/arch/x86_64/kernel/x8664_ksyms.c Wed Jan 11 14:35:45 2006 -0800
    @@ -163,6 +163,8 @@
    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 05b3d1af27eb -r 1052904816d7 arch/x86_64/lib/Makefile
    --- a/arch/x86_64/lib/Makefile Wed Jan 11 14:35:45 2006 -0800
    +++ b/arch/x86_64/lib/Makefile Wed Jan 11 14:35:45 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 05b3d1af27eb -r 1052904816d7 include/asm-x86_64/string.h
    --- a/include/asm-x86_64/string.h Wed Jan 11 14:35:45 2006 -0800
    +++ b/include/asm-x86_64/string.h Wed Jan 11 14:35:45 2006 -0800
    @@ -45,6 +45,9 @@
    #define __HAVE_ARCH_MEMMOVE
    void * memmove(void * dest,const void *src,size_t count);

    +/* copy data, 32 bits at a time */
    +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 05b3d1af27eb -r 1052904816d7 arch/x86_64/lib/memcpy32.S
    --- /dev/null Thu Jan 1 00:00:00 1970 +0000
    +++ b/arch/x86_64/lib/memcpy32.S Wed Jan 11 14:35:45 2006 -0800
    @@ -0,0 +1,32 @@
    +/*
    + * 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 data, in units of 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
    + */
    + .globl memcpy32
    +memcpy32:
    + movl %edx,%ecx
    + shrl $1,%ecx
    + andl $1,%edx
    + rep movsq
    + movl %edx,%ecx
    + rep movsd
    + ret
    -
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