From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761938AbXGKTY2 (ORCPT ); Wed, 11 Jul 2007 15:24:28 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932574AbXGKTTf (ORCPT ); Wed, 11 Jul 2007 15:19:35 -0400 Received: from terminus.zytor.com ([192.83.249.54]:38277 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932132AbXGKTTa (ORCPT ); Wed, 11 Jul 2007 15:19:30 -0400 From: "H. Peter Anvin" To: torvalds@linux-foundation.org, andi@firstfloor.org, linux-kernel@vger.kernel.org Cc: "H. Peter Anvin" Subject: [x86 setup 16/33] String-handling functions for the new x86 setup code. Date: Wed, 11 Jul 2007 12:18:41 -0700 Message-Id: <1184181541746-git-send-email-hpa@zytor.com> X-Mailer: git-send-email 1.5.2.2 In-Reply-To: <11841815411443-git-send-email-hpa@zytor.com> References: <1184181538674-git-send-email-hpa@zytor.com> <118418153862-git-send-email-hpa@zytor.com> <11841815382283-git-send-email-hpa@zytor.com> <11841815392122-git-send-email-hpa@zytor.com> <11841815393975-git-send-email-hpa@zytor.com> <11841815393014-git-send-email-hpa@zytor.com> <1184181539416-git-send-email-hpa@zytor.com> <118418153972-git-send-email-hpa@zytor.com> <11841815391923-git-send-email-hpa@zytor.com> <11841815403678-git-send-email-hpa@zytor.com> <11841815403041-git-send-email-hpa@zytor.com> <11841815402349-git-send-email-hpa@zytor.com> <11841815401013-git-send-email-hpa@zytor.com> <1184181540369-git-send-email-hpa@zytor.com> <11841815401476-git-send-email-hpa@zytor.com> <11841815411443-git-send-email-hpa@zytor.com> Message-Id: <8697ab9d1471721ca1c40a2224191d276c78ea0e.1184181208.git.hpa@zytor.com> In-Reply-To: <7aca4ce0a222438c94300a2ea535270a21db8812.1184181208.git.hpa@zytor.com> References: <7aca4ce0a222438c94300a2ea535270a21db8812.1184181208.git.hpa@zytor.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org 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 | 52 ++++++++++++++++++++++++ 2 files changed, 153 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..481a220 --- /dev/null +++ b/arch/i386/boot/string.c @@ -0,0 +1,52 @@ +/* -*- 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" + +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; +} + +size_t strnlen(const char *s, size_t maxlen) +{ + const char *es = s; + while (*es && maxlen) { + es++; + maxlen--; + } + + return (es - s); +} + +unsigned int atou(const char *s) +{ + unsigned int i = 0; + while (isdigit(*s)) + i = i * 10 + (*s++ - '0'); + return i; +} -- 1.5.2.2