android_kernel_xiaomi_sm8350/arch/avr32/lib/memset.S

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[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 02:32:13 -04:00
/*
* 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