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Commit 5be86566 authored by H. Peter Anvin's avatar H. Peter Anvin Committed by Linus Torvalds
Browse files

String-handling functions for the new x86 setup code. 



strcmp(), memcpy(), memset(), as well as routines to copy to and from
other segments (as pointed to by fs and gs).

Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent ad7e906d

arch/i386/boot/copy.S

0 → 100644
+101 −0
Original line number Diff line number Diff line 
/* ----------------------------------------------------------------------- *

 *

 *   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

arch/i386/boot/string.c

0 → 100644
+52 −0
Original line number Diff line number Diff line 
/* -*- 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;

}