Commit 4a899227 authored by Catalin Marinas's avatar Catalin Marinas
Browse files

arm64: klib: Optimised memory functions 



This patch introduces AArch64-specific memory functions (memcpy,
memmove, memchr, memset). These functions are not optimised for any CPU
implementation but can be used as a starting point once hardware is
available.

Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 79207206

arch/arm64/include/asm/Kbuild

+0 −1
Original line number Diff line number Diff line
@@ -39,7 +39,6 @@ generic-y += shmbuf.h 
generic-y += sizes.h

generic-y += socket.h

generic-y += sockios.h

generic-y += string.h

generic-y += switch_to.h

generic-y += swab.h

generic-y += termbits.h

arch/arm64/include/asm/string.h

0 → 100644
+31 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2013 ARM Ltd.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 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, see <http://www.gnu.org/licenses/>.

 */

#ifndef __ASM_STRING_H

#define __ASM_STRING_H



#define __HAVE_ARCH_MEMCPY

extern void *memcpy(void *, const void *, __kernel_size_t);



#define __HAVE_ARCH_MEMMOVE

extern void *memmove(void *, const void *, __kernel_size_t);



#define __HAVE_ARCH_MEMCHR

extern void *memchr(const void *, int, __kernel_size_t);



#define __HAVE_ARCH_MEMSET

extern void *memset(void *, int, __kernel_size_t);



#endif

arch/arm64/kernel/arm64ksyms.c

+6 −0
Original line number Diff line number Diff line
@@ -46,3 +46,9 @@ EXPORT_SYMBOL(__atomic_hash); 


	/* physical memory */

EXPORT_SYMBOL(memstart_addr);



	/* string / mem functions */

EXPORT_SYMBOL(memset);

EXPORT_SYMBOL(memcpy);

EXPORT_SYMBOL(memmove);

EXPORT_SYMBOL(memchr);

arch/arm64/lib/Makefile

+2 −1
Original line number Diff line number Diff line 
lib-y		:= bitops.o delay.o					\

		   strncpy_from_user.o strnlen_user.o clear_user.o	\

		   copy_from_user.o copy_to_user.o copy_in_user.o	\

		   copy_page.o clear_page.o
 
		   copy_page.o clear_page.o				\

		   memchr.o memcpy.o memmove.o memset.o

arch/arm64/lib/memchr.S

0 → 100644
+44 −0
Original line number Diff line number Diff line 
/*

 * Based on arch/arm/lib/memchr.S

 *

 * Copyright (C) 1995-2000 Russell King

 * Copyright (C) 2013 ARM Ltd.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 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, see <http://www.gnu.org/licenses/>.

 */



#include <linux/linkage.h>

#include <asm/assembler.h>



/*

 * Find a character in an area of memory.

 *

 * Parameters:

 *	x0 - buf

 *	x1 - c

 *	x2 - n

 * Returns:

 *	x0 - address of first occurrence of 'c' or 0

 */

ENTRY(memchr)

	and	w1, w1, #0xff

1:	subs	x2, x2, #1

	b.mi	2f

	ldrb	w3, [x0], #1

	cmp	w3, w1

	b.ne	1b

	sub	x0, x0, #1

	ret

2:	mov	x0, #0

	ret

ENDPROC(memchr)

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