linux/arch/avr32/lib/io-readsw.S

/*
 * Copyright (C) 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.
 */

.Lnot_word_aligned:
	/*
	 * Bad alignment will cause a hardware exception, which is as
	 * good as anything. No need for us to check for proper alignment.
	 */
	ld.uh	r8, r12[0]
	sub	r10, 1
	st.h	r11++, r8

	/* fall through */

	.global	__raw_readsw
	.type	__raw_readsw,@function
__raw_readsw:
	cp.w	r10, 0
	reteq	r12
	mov	r9, 3
	tst	r11, r9
	brne	.Lnot_word_aligned

	sub	r10, 2
	brlt	2f

1:	ldins.h	r8:t, r12[0]
	ldins.h	r8:b, r12[0]
	st.w	r11++, r8
	sub	r10, 2
	brge	1b

2:	sub	r10, -2
	reteq	r12

	ld.uh	r8, r12[0]
	st.h	r11++, r8
	retal	r12
[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> 2006-09-26 14:32:13 +08:00			`/*`
			`* Copyright (C) 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.`
			`*/`

			`.Lnot_word_aligned:`
			`/*`
			`* Bad alignment will cause a hardware exception, which is as`
			`* good as anything. No need for us to check for proper alignment.`
			`*/`
			`ld.uh r8, r12[0]`
			`sub r10, 1`
			`st.h r11++, r8`

			`/* fall through */`

			`.global __raw_readsw`
			`.type __raw_readsw,@function`
			`__raw_readsw:`
			`cp.w r10, 0`
			`reteq r12`
			`mov r9, 3`
			`tst r11, r9`
			`brne .Lnot_word_aligned`

			`sub r10, 2`
			`brlt 2f`

			`1: ldins.h r8:t, r12[0]`
			`ldins.h r8:b, r12[0]`
			`st.w r11++, r8`
			`sub r10, 2`
			`brge 1b`

			`2: sub r10, -2`
			`reteq r12`

			`ld.uh r8, r12[0]`
			`st.h r11++, r8`
			`retal r12`