linux/arch/avr32/lib/memset.S

/*
 * Copyright (C) 2004-2006 Atmel Corporation
 *
 * Based on linux/arch/arm/lib/memset.S
 *   Copyright (C) 1995-2000 Russell King
 *
 * 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.
 *
 * ASM optimised string functions
 */
#include <asm/asm.h>

	/*
	 * r12:	void *b
	 * r11:	int c
	 * r10:	size_t len
	 *
	 * Returns b in r12
	 */
	.text
	.global	memset
	.type	memset, @function
	.align	5
memset:
	mov	r9, r12
	mov	r8, r12
	or	r11, r11, r11 << 8
	andl	r9, 3, COH
	brne	1f

2:	or	r11, r11, r11 << 16
	sub	r10, 4
	brlt	5f

	/* Let's do some real work */
4:	st.w	r8++, r11
	sub	r10, 4
	brge	4b

	/*
	 * When we get here, we've got less than 4 bytes to set. r10
	 * might be negative.
	 */
5:	sub	r10, -4
	reteq	r12

	/* Fastpath ends here, exactly 32 bytes from memset */

	/* Handle unaligned count or pointer */
	bld	r10, 1
	brcc	6f
	st.b	r8++, r11
	st.b	r8++, r11
	bld	r10, 0
	retcc	r12
6:	st.b	r8++, r11
	retal	r12

	/* Handle unaligned pointer */
1:	sub	r10, 4
	brlt	5b
	add	r10, r9
	lsl	r9, 1
	add	pc, r9
	st.b	r8++, r11
	st.b	r8++, r11
	st.b	r8++, r11
	rjmp	2b

	.size	memset, . - memset
[PATCH] avr32 architecture This adds support for the Atmel AVR32 architecture as well as the AT32AP7000 CPU and the AT32STK1000 development board. AVR32 is a new high-performance 32-bit RISC microprocessor core, designed for cost-sensitive embedded applications, with particular emphasis on low power consumption and high code density. The AVR32 architecture is not binary compatible with earlier 8-bit AVR architectures. The AVR32 architecture, including the instruction set, is described by the AVR32 Architecture Manual, available from http://www.atmel.com/dyn/resources/prod_documents/doc32000.pdf The Atmel AT32AP7000 is the first CPU implementing the AVR32 architecture. It features a 7-stage pipeline, 16KB instruction and data caches and a full Memory Management Unit. It also comes with a large set of integrated peripherals, many of which are shared with the AT91 ARM-based controllers from Atmel. Full data sheet is available from http://www.atmel.com/dyn/resources/prod_documents/doc32003.pdf while the CPU core implementation including caches and MMU is documented by the AVR32 AP Technical Reference, available from http://www.atmel.com/dyn/resources/prod_documents/doc32001.pdf Information about the AT32STK1000 development board can be found at http://www.atmel.com/dyn/products/tools_card.asp?tool_id=3918 including a BSP CD image with an earlier version of this patch, development tools (binaries and source/patches) and a root filesystem image suitable for booting from SD card. Alternatively, there's a preliminary "getting started" guide available at http://avr32linux.org/twiki/bin/view/Main/GettingStarted which provides links to the sources and patches you will need in order to set up a cross-compiling environment for avr32-linux. This patch, as well as the other patches included with the BSP and the toolchain patches, is actively supported by Atmel Corporation. [dmccr@us.ibm.com: Fix more pxx_page macro locations] [bunk@stusta.de: fix `make defconfig'] Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Dave McCracken <dmccr@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org> 2006-09-26 14:32:13 +08:00			`/*`
			`* Copyright (C) 2004-2006 Atmel Corporation`
			`*`
			`* Based on linux/arch/arm/lib/memset.S`
			`* Copyright (C) 1995-2000 Russell King`
			`*`
			`* 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.`
			`*`
			`* ASM optimised string functions`
			`*/`
			`#include <asm/asm.h>`

			`/*`
			`* r12: void *b`
			`* r11: int c`
			`* r10: size_t len`
			`*`
			`* Returns b in r12`
			`*/`
			`.text`
			`.global memset`
			`.type memset, @function`
			`.align 5`
			`memset:`
			`mov r9, r12`
			`mov r8, r12`
			`or r11, r11, r11 << 8`
			`andl r9, 3, COH`
			`brne 1f`

			`2: or r11, r11, r11 << 16`
			`sub r10, 4`
			`brlt 5f`

			`/* Let's do some real work */`
			`4: st.w r8++, r11`
			`sub r10, 4`
			`brge 4b`

			`/*`
			`* When we get here, we've got less than 4 bytes to set. r10`
			`* might be negative.`
			`*/`
			`5: sub r10, -4`
			`reteq r12`

			`/* Fastpath ends here, exactly 32 bytes from memset */`

			`/* Handle unaligned count or pointer */`
			`bld r10, 1`
			`brcc 6f`
			`st.b r8++, r11`
			`st.b r8++, r11`
			`bld r10, 0`
			`retcc r12`
			`6: st.b r8++, r11`
			`retal r12`

			`/* Handle unaligned pointer */`
			`1: sub r10, 4`
			`brlt 5b`
			`add r10, r9`
			`lsl r9, 1`
			`add pc, r9`
			`st.b r8++, r11`
			`st.b r8++, r11`
			`st.b r8++, r11`
			`rjmp 2b`

			`.size memset, . - memset`