Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932548AbWAJT4I (ORCPT ); Tue, 10 Jan 2006 14:56:08 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932540AbWAJTzs (ORCPT ); Tue, 10 Jan 2006 14:55:48 -0500 Received: from mx.pathscale.com ([64.160.42.68]:58282 "EHLO mx.pathscale.com") by vger.kernel.org with ESMTP id S932314AbWAJTzm (ORCPT ); Tue, 10 Jan 2006 14:55:42 -0500 Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [PATCH 2 of 3] memcpy32 for x86_64 X-Mercurial-Node: b4863171295fdb6e820642e726101e45111a8966 Message-Id: In-Reply-To: Date: Tue, 10 Jan 2006 11:53:58 -0800 From: "Bryan O'Sullivan" To: akpm@osdl.org Cc: linux-kernel@vger.kernel.org, hch@infradead.org, ak@suse.de, rdreier@cisco.com Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3249 Lines: 87 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 diff -r 2d4af213d9c5 -r b4863171295f arch/x86_64/kernel/x8664_ksyms.c --- a/arch/x86_64/kernel/x8664_ksyms.c Tue Jan 10 11:52:46 2006 -0800 +++ b/arch/x86_64/kernel/x8664_ksyms.c Tue Jan 10 11:52:48 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 2d4af213d9c5 -r b4863171295f arch/x86_64/lib/Makefile --- a/arch/x86_64/lib/Makefile Tue Jan 10 11:52:46 2006 -0800 +++ b/arch/x86_64/lib/Makefile Tue Jan 10 11:52:48 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 2d4af213d9c5 -r b4863171295f include/asm-x86_64/string.h --- a/include/asm-x86_64/string.h Tue Jan 10 11:52:46 2006 -0800 +++ b/include/asm-x86_64/string.h Tue Jan 10 11:52:48 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 2d4af213d9c5 -r b4863171295f arch/x86_64/lib/memcpy32.S --- /dev/null Thu Jan 1 00:00:00 1970 +0000 +++ b/arch/x86_64/lib/memcpy32.S Tue Jan 10 11:52:48 2006 -0800 @@ -0,0 +1,39 @@ +/* + * 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. + */ + +/* + * Registers used below: + * dst - rdi + * src - rsi + * count - rdx + */ + +/** + * 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/