linux/arch/avr32/lib/csum_partial_copy_generic.S
Haavard Skinnemoen 5f97f7f940 [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 08:48:54 -07:00

100 lines
1.7 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.
*/
#include <asm/errno.h>
#include <asm/asm.h>
/*
* unsigned int csum_partial_copy_generic(const char *src, char *dst, int len
* int sum, int *src_err_ptr,
* int *dst_err_ptr)
*
* Copy src to dst while checksumming, otherwise like csum_partial.
*/
.macro ld_src size, reg, ptr
9999: ld.\size \reg, \ptr
.section __ex_table, "a"
.long 9999b, fixup_ld_src
.previous
.endm
.macro st_dst size, ptr, reg
9999: st.\size \ptr, \reg
.section __ex_table, "a"
.long 9999b, fixup_st_dst
.previous
.endm
.text
.global csum_partial_copy_generic
.type csum_partial_copy_generic,"function"
.align 1
csum_partial_copy_generic:
pushm r4-r7,lr
/* The inner loop */
1: sub r10, 4
brlt 5f
2: ld_src w, r5, r12++
st_dst w, r11++, r5
add r9, r5
acr r9
sub r10, 4
brge 2b
/* return if we had a whole number of words */
5: sub r10, -4
brne 7f
6: mov r12, r9
popm r4-r7,pc
/* handle additional bytes at the tail */
7: mov r5, 0
mov r4, 32
8: ld_src ub, r6, r12++
st_dst b, r11++, r6
lsl r5, 8
sub r4, 8
bfins r5, r6, 0, 8
sub r10, 1
brne 8b
lsl r5, r5, r4
add r9, r5
acr r9
rjmp 6b
/* Exception handler */
.section .fixup,"ax"
.align 1
fixup_ld_src:
mov r9, -EFAULT
cp.w r8, 0
breq 1f
st.w r8[0], r9
1: /*
* TODO: zero the complete destination - computing the rest
* is too much work
*/
mov r9, 0
rjmp 6b
fixup_st_dst:
mov r9, -EFAULT
lddsp r8, sp[20]
cp.w r8, 0
breq 1f
st.w r8[0], r9
1: mov r9, 0
rjmp 6b
.previous