ihndlr.h

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00001 #ifndef _ARCH_AVR32_INTERRUPT_HANDLER_H_
00002 #define _ARCH_AVR32_INTERRUPT_HANDLER_H_
00003 
00004 /*
00005 * Copyright (C) 2001-2005 by egnite Software GmbH. All rights reserved.
00006 *
00007 * Redistribution and use in source and binary forms, with or without
00008 * modification, are permitted provided that the following conditions
00009 * are met:
00010 *
00011 * 1. Redistributions of source code must retain the above copyright
00012 *    notice, this list of conditions and the following disclaimer.
00013 * 2. Redistributions in binary form must reproduce the above copyright
00014 *    notice, this list of conditions and the following disclaimer in the
00015 *    documentation and/or other materials provided with the distribution.
00016 * 3. Neither the name of the copyright holders nor the names of
00017 *    contributors may be used to endorse or promote products derived
00018 *    from this software without specific prior written permission.
00019 *
00020 * THIS SOFTWARE IS PROVIDED BY EGNITE SOFTWARE GMBH AND CONTRIBUTORS
00021 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
00022 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
00023 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL EGNITE
00024 * SOFTWARE GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
00025 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
00026 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
00027 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
00028 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
00029 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
00030 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00031 * SUCH DAMAGE.
00032 *
00033 * For additional information see http://www.ethernut.de/
00034 */
00035 
00036 /*
00037 * $Log: ihndlr.h,v $
00038 *
00039 */
00040 
00041 //
00042 //  W A R N I N G
00043 //  -------------
00044 //
00045 // This file is not part of the Nut/OS API.  It exists for the convenience
00046 // of Interrupt Handling.  This header file may change from version
00047 // to version without notice, or even be removed.
00048 //
00049 // We mean it.
00050 //
00051 //
00052 
00054 #if __GNUC__
00055 typedef void (*__int_handler)(void);
00056 #elif __ICCAVR32__
00057 typedef void (__interrupt *__int_handler)(void);
00058 #endif
00059 
00060 extern void register_interrupt(__int_handler handler, unsigned int irq, unsigned int int_lev);
00061 
00062 /*
00063     WHEN CHANGING PLEASE NOTICE:
00064     Errata 41.5.5.5 reads:
00065     "Need two NOPs instruction after instructions masking interrupts
00066     The instructions following in the pipeline the instruction masking the interrupt through SR
00067     may behave abnormally.
00068     Fix/Workaround
00069     Place two NOPs instructions after each SSRF or MTSR instruction setting IxM or GM in SR."
00070 */
00071 #define IRQ_ENTRY()                                                                         \
00072 {                                                                                           \
00073     /* Prevent preempted interrupts disabling global interrupts */                          \
00074     __asm__ __volatile__ ("ssrf\t%0; nop; nop" :: "i" (AVR32_SR_GM_OFFSET) : "memory");     \
00075                                                                                             \
00076     /* Save R0..R7. Other registers are saved by the CPU if __AVR32_UC__ */                 \
00077     /* Or by exception.S if __AVR32_AP7000__ */                                             \
00078     __asm__ __volatile__ ("pushm r0-r7");                                                   \
00079 }
00080 
00081 
00082 #define IRQ_EXIT()                                                                          \
00083 {                                                                                           \
00084     /* Restore R0..R7 */                                                                    \
00085     __asm__ __volatile__ ("popm r0-r7");                                                    \
00086                                                                                             \
00087     /* Prevent preempted interrupts disabling global interrupts */                          \
00088     __asm__ __volatile__ ("csrf\t%0" :: "i" (AVR32_SR_GM_OFFSET) : "memory");               \
00089 }
00090 
00091 #endif // _ARCH_AVR32_INTERRUPT_HANDLER_H_

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