[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>

1 files changed, 60 insertions, 0 deletions

diff --git a/arch/avr32/lib/strncpy_from_user.S b/arch/avr32/lib/strncpy_from_user.S
new file mode 100644
index 000000000000..72bd50599ec6
--- /dev/null
+++ b/arch/avr32/lib/strncpy_from_user.S
@@ -0,0 +1,60 @@
+/*
+ * 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 <linux/errno.h>
+
+#include <asm/page.h>
+#include <asm/thread_info.h>
+#include <asm/asm.h>
+
+        /*
+         * long strncpy_from_user(char *dst, const char *src, long count)
+         *
+         * On success, returns the length of the string, not including
+         * the terminating NUL.
+         *
+         * If the string is longer than count, returns count
+         *
+         * If userspace access fails, returns -EFAULT
+         */
+        .text
+        .align  1
+        .global strncpy_from_user
+        .type   strncpy_from_user, "function"
+strncpy_from_user:
+        mov     r9, -EFAULT
+        branch_if_kernel r8, __strncpy_from_user
+        ret_if_privileged r8, r11, r10, r9
+
+        .global __strncpy_from_user
+        .type   __strncpy_from_user, "function"
+__strncpy_from_user:
+        cp.w    r10, 0
+        reteq   0
+
+        mov     r9, r10
+
+1:      ld.ub   r8, r11++
+        st.b    r12++, r8
+        cp.w    r8, 0
+        breq    2f
+        sub     r9, 1
+        brne    1b
+
+2:      sub     r10, r9
+        retal   r10
+
+        .section .fixup, "ax"
+        .align  1
+3:      mov     r12, -EFAULT
+        retal   r12
+
+        .section __ex_table, "a"
+        .align  2
+        .long   1b, 3b