|author||Haavard Skinnemoen <firstname.lastname@example.org>||2006-09-25 23:32:13 -0700|
|committer||Linus Torvalds <email@example.com>||2006-09-26 08:48:54 -0700|
[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. [firstname.lastname@example.org: Fix more pxx_page macro locations] [email@example.com: fix `make defconfig'] Signed-off-by: Haavard Skinnemoen <firstname.lastname@example.org> Signed-off-by: Adrian Bunk <email@example.com> Signed-off-by: Dave McCracken <firstname.lastname@example.org> Signed-off-by: Andrew Morton <email@example.com> Signed-off-by: Linus Torvalds <firstname.lastname@example.org>
Diffstat (limited to 'arch/avr32/lib/strncpy_from_user.S')
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
@@ -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.
+ * 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
+ .align 1
+ .global strncpy_from_user
+ .type strncpy_from_user, "function"
+ 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"
+ 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