mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-26 21:54:11 +08:00
5f97f7f940
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>
63 lines
1.1 KiB
ArmAsm
63 lines
1.1 KiB
ArmAsm
/*
|
|
* Copyright (C) 2004-2006 Atmel Corporation
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
/*
|
|
* void *memcpy(void *to, const void *from, unsigned long n)
|
|
*
|
|
* This implementation does word-aligned loads in the main loop,
|
|
* possibly sacrificing alignment of stores.
|
|
*
|
|
* Hopefully, in most cases, both "to" and "from" will be
|
|
* word-aligned to begin with.
|
|
*/
|
|
.text
|
|
.global memcpy
|
|
.type memcpy, @function
|
|
memcpy:
|
|
mov r9, r11
|
|
andl r9, 3, COH
|
|
brne 1f
|
|
|
|
/* At this point, "from" is word-aligned */
|
|
2: sub r10, 4
|
|
mov r9, r12
|
|
brlt 4f
|
|
|
|
3: ld.w r8, r11++
|
|
sub r10, 4
|
|
st.w r12++, r8
|
|
brge 3b
|
|
|
|
4: neg r10
|
|
reteq r9
|
|
|
|
/* Handle unaligned count */
|
|
lsl r10, 2
|
|
add pc, pc, r10
|
|
ld.ub r8, r11++
|
|
st.b r12++, r8
|
|
ld.ub r8, r11++
|
|
st.b r12++, r8
|
|
ld.ub r8, r11++
|
|
st.b r12++, r8
|
|
retal r9
|
|
|
|
/* Handle unaligned "from" pointer */
|
|
1: sub r10, 4
|
|
brlt 4b
|
|
add r10, r9
|
|
lsl r9, 2
|
|
add pc, pc, r9
|
|
ld.ub r8, r11++
|
|
st.b r12++, r8
|
|
ld.ub r8, r11++
|
|
st.b r12++, r8
|
|
ld.ub r8, r11++
|
|
st.b r12++, r8
|
|
rjmp 2b
|