mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-11-19 08:05:27 +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>
77 lines
1.2 KiB
ArmAsm
77 lines
1.2 KiB
ArmAsm
/*
|
|
* 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/asm.h>
|
|
|
|
.text
|
|
.align 1
|
|
.global clear_user
|
|
.type clear_user, "function"
|
|
clear_user:
|
|
branch_if_kernel r8, __clear_user
|
|
ret_if_privileged r8, r12, r11, r11
|
|
|
|
.global __clear_user
|
|
.type __clear_user, "function"
|
|
__clear_user:
|
|
mov r9, r12
|
|
mov r8, 0
|
|
andl r9, 3, COH
|
|
brne 5f
|
|
|
|
1: sub r11, 4
|
|
brlt 2f
|
|
|
|
10: st.w r12++, r8
|
|
sub r11, 4
|
|
brge 10b
|
|
|
|
2: sub r11, -4
|
|
reteq 0
|
|
|
|
/* Unaligned count or address */
|
|
bld r11, 1
|
|
brcc 12f
|
|
11: st.h r12++, r8
|
|
sub r11, 2
|
|
reteq 0
|
|
12: st.b r12++, r8
|
|
retal 0
|
|
|
|
/* Unaligned address */
|
|
5: cp.w r11, 4
|
|
brlt 2b
|
|
|
|
lsl r9, 2
|
|
add pc, pc, r9
|
|
13: st.b r12++, r8
|
|
sub r11, 1
|
|
14: st.b r12++, r8
|
|
sub r11, 1
|
|
15: st.b r12++, r8
|
|
sub r11, 1
|
|
rjmp 1b
|
|
|
|
.size clear_user, . - clear_user
|
|
.size __clear_user, . - __clear_user
|
|
|
|
.section .fixup, "ax"
|
|
.align 1
|
|
18: sub r11, -4
|
|
19: retal r11
|
|
|
|
.section __ex_table, "a"
|
|
.align 2
|
|
.long 10b, 18b
|
|
.long 11b, 19b
|
|
.long 12b, 19b
|
|
.long 13b, 19b
|
|
.long 14b, 19b
|
|
.long 15b, 19b
|