mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-31 00:17:44 +00:00
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>
67 lines
1.2 KiB
ArmAsm
67 lines
1.2 KiB
ArmAsm
/*
|
|
* Copy to/from userspace with optional address space checking.
|
|
*
|
|
* Copyright 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/page.h>
|
|
#include <asm/thread_info.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/asm.h>
|
|
|
|
.text
|
|
.align 1
|
|
.global strnlen_user
|
|
.type strnlen_user, "function"
|
|
strnlen_user:
|
|
branch_if_kernel r8, __strnlen_user
|
|
sub r8, r11, 1
|
|
add r8, r12
|
|
retcs 0
|
|
brmi adjust_length /* do a closer inspection */
|
|
|
|
.global __strnlen_user
|
|
.type __strnlen_user, "function"
|
|
__strnlen_user:
|
|
mov r10, r12
|
|
|
|
10: ld.ub r8, r12++
|
|
cp.w r8, 0
|
|
breq 2f
|
|
sub r11, 1
|
|
brne 10b
|
|
|
|
sub r12, -1
|
|
2: sub r12, r10
|
|
retal r12
|
|
|
|
|
|
.type adjust_length, "function"
|
|
adjust_length:
|
|
cp.w r12, 0 /* addr must always be < TASK_SIZE */
|
|
retmi 0
|
|
|
|
pushm lr
|
|
lddpc lr, _task_size
|
|
sub r11, lr, r12
|
|
mov r9, r11
|
|
rcall __strnlen_user
|
|
cp.w r12, r9
|
|
brgt 1f
|
|
popm pc
|
|
1: popm pc, r12=0
|
|
|
|
.align 2
|
|
_task_size:
|
|
.long TASK_SIZE
|
|
|
|
.section .fixup, "ax"
|
|
.align 1
|
|
19: retal 0
|
|
|
|
.section __ex_table, "a"
|
|
.align 2
|
|
.long 10b, 19b
|