[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>
diff --git a/arch/avr32/lib/clear_user.S b/arch/avr32/lib/clear_user.S
new file mode 100644
index 0000000..d8991b6
--- /dev/null
+++ b/arch/avr32/lib/clear_user.S
@@ -0,0 +1,76 @@
+/*
+ * 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