From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from terminus.zytor.com ([192.83.249.54]:57222 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760750AbXGJD1J (ORCPT ); Mon, 9 Jul 2007 23:27:09 -0400 From: "H. Peter Anvin" Subject: [x86 setup 16/33] String-handling functions for the new x86 setup code. Date: Mon, 9 Jul 2007 19:51:55 -0700 Message-Id: <11840376162370-git-send-email-hpa@zytor.com> In-Reply-To: <1184037510289-git-send-email-hpa@zytor.com> References: <11840359321823-git-send-email-hpa@zytor.com> <11840360383913-git-send-email-hpa@zytor.com> <11840361432207-git-send-email-hpa@zytor.com> <11840362483663-git-send-email-hpa@zytor.com> <11840363531039-git-send-email-hpa@zytor.com> <11840364593068-git-send-email-hpa@zytor.com> <1184036564610-git-send-email-hpa@zytor.com> <11840366692770-git-send-email-hpa@zytor.com> <11840367741994-git-send-email-hpa@zytor.com> <11840368791603-git-send-email-hpa@zytor.com> <11840369841576-git-send-email-hpa@zytor.com> <11840370903975-git-send-email-hpa@zytor.com> <11840371953778-git-send-email-hpa@zytor.com> <11840373002601-git-send-email-hpa@zytor.com> <11840374052662-git-send-email-hpa@zytor.com> <1184037510289-git-send-email-hpa@zytor.com> Message-Id: In-Reply-To: <2034f71d414def30de582fb59573295cadbdabb4.1184032748.git.hpa@zytor.com> References: <2034f71d414def30de582fb59573295cadbdabb4.1184032748.git.hpa@zytor.com> Sender: linux-arch-owner@vger.kernel.org To: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, andi@firstfloor.org, akpm@linux-foundation.org Cc: "H. Peter Anvin" List-ID: From: H. Peter Anvin strcmp(), memcpy(), memset(), as well as routines to copy to and from other segments (as pointed to by fs and gs). Signed-off-by: H. Peter Anvin --- arch/i386/boot/copy.S | 101 +++++++++++++++++++++++++++++++++++++++++++++++ arch/i386/boot/string.c | 34 ++++++++++++++++ 2 files changed, 135 insertions(+), 0 deletions(-) create mode 100644 arch/i386/boot/copy.S create mode 100644 arch/i386/boot/string.c diff --git a/arch/i386/boot/copy.S b/arch/i386/boot/copy.S new file mode 100644 index 0000000..ef127e5 --- /dev/null +++ b/arch/i386/boot/copy.S @@ -0,0 +1,101 @@ +/* ----------------------------------------------------------------------- * + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright 2007 rPath, Inc. - All Rights Reserved + * + * This file is part of the Linux kernel, and is made available under + * the terms of the GNU General Public License version 2. + * + * ----------------------------------------------------------------------- */ + +/* + * arch/i386/boot/copy.S + * + * Memory copy routines + */ + + .code16gcc + .text + + .globl memcpy + .type memcpy, @function +memcpy: + pushw %si + pushw %di + movw %ax, %di + movw %dx, %si + pushw %cx + shrw $2, %cx + rep; movsl + popw %cx + andw $3, %cx + rep; movsb + popw %di + popw %si + ret + .size memcpy, .-memcpy + + .globl memset + .type memset, @function +memset: + pushw %di + movw %ax, %di + movzbl %dl, %eax + imull $0x01010101,%eax + pushw %cx + shrw $2, %cx + rep; stosl + popw %cx + andw $3, %cx + rep; stosb + popw %di + ret + .size memset, .-memset + + .globl copy_from_fs + .type copy_from_fs, @function +copy_from_fs: + pushw %ds + pushw %fs + popw %ds + call memcpy + popw %ds + ret + .size copy_from_fs, .-copy_from_fs + + .globl copy_to_fs + .type copy_to_fs, @function +copy_to_fs: + pushw %es + pushw %fs + popw %es + call memcpy + popw %es + ret + .size copy_to_fs, .-copy_to_fs + +#if 0 /* Not currently used, but can be enabled as needed */ + + .globl copy_from_gs + .type copy_from_gs, @function +copy_from_gs: + pushw %ds + pushw %gs + popw %ds + call memcpy + popw %ds + ret + .size copy_from_gs, .-copy_from_gs + .globl copy_to_gs + + .type copy_to_gs, @function +copy_to_gs: + pushw %es + pushw %gs + popw %es + call memcpy + popw %es + ret + .size copy_to_gs, .-copy_to_gs + +#endif diff --git a/arch/i386/boot/string.c b/arch/i386/boot/string.c new file mode 100644 index 0000000..0808197 --- /dev/null +++ b/arch/i386/boot/string.c @@ -0,0 +1,34 @@ +/* -*- linux-c -*- ------------------------------------------------------- * + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright 2007 rPath, Inc. - All Rights Reserved + * + * This file is part of the Linux kernel, and is made available under + * the terms of the GNU General Public License version 2. + * + * ----------------------------------------------------------------------- */ + +/* + * arch/i386/boot/string.c + * + * Very basic string functions + */ + +#include "boot.h" +#include + +int strcmp(const char *str1, const char *str2) +{ + const unsigned char *s1 = (const unsigned char *)str1; + const unsigned char *s2 = (const unsigned char *)str2; + int delta = 0; + + while (*s1 || *s2) { + delta = *s2 - *s1; + if (delta) + return delta; + s1++; + s2++; + } + return 0; +} -- 1.5.2.2