00001 /* 00002 * Copyright (C) 2001-2005 by egnite Software GmbH. All rights reserved. 00003 * 00004 * Redistribution and use in source and binary forms, with or without 00005 * modification, are permitted provided that the following conditions 00006 * are met: 00007 * 00008 * 1. Redistributions of source code must retain the above copyright 00009 * notice, this list of conditions and the following disclaimer. 00010 * 2. Redistributions in binary form must reproduce the above copyright 00011 * notice, this list of conditions and the following disclaimer in the 00012 * documentation and/or other materials provided with the distribution. 00013 * 3. Neither the name of the copyright holders nor the names of 00014 * contributors may be used to endorse or promote products derived 00015 * from this software without specific prior written permission. 00016 * 00017 * THIS SOFTWARE IS PROVIDED BY EGNITE SOFTWARE GMBH AND CONTRIBUTORS 00018 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 00019 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 00020 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL EGNITE 00021 * SOFTWARE GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 00022 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 00023 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 00024 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 00025 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 00026 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 00027 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 00028 * SUCH DAMAGE. 00029 * 00030 * For additional information see http://www.ethernut.de/ 00031 * 00032 */ 00033 00034 /* 00035 * $Log: atom.h,v $ 00036 * Revision 1.5 2008/03/17 10:15:36 haraldkipp 00037 * Added memory and cc clobbers to NutEnter/ExitCritical. This keeps 00038 * compiler optimizations inside and outside of critical sections 00039 * seperated. 00040 * 00041 * Revision 1.4 2007/08/17 10:47:03 haraldkipp 00042 * Bug #1757410 fixed. NutEnter/ExitCritical destroyed ARM register R0. 00043 * 00044 * Revision 1.3 2006/03/02 20:03:39 haraldkipp 00045 * Added ICCARM inline assembly for NutEnter/ExitCritical(). Also fixed 00046 * SF 1440949 (FIQ never enabled). 00047 * 00048 * Revision 1.2 2005/07/26 15:47:06 haraldkipp 00049 * AtomicInc() and AtomicDec() are no longer required by Nut/Net. 00050 * Removed to simplify the porting job. Broken applications should 00051 * implement their own version. 00052 * 00053 * Revision 1.1 2005/06/06 10:49:35 haraldkipp 00054 * Building outside the source tree failed. All header files moved from 00055 * arch/cpu/include to include/arch/cpu. 00056 * 00057 * Revision 1.1 2005/05/27 17:41:52 drsung 00058 * Moved the file. 00059 * 00060 * Revision 1.1 2005/05/26 10:08:42 drsung 00061 * Moved the platform dependend code from include/sys/atom.h to this file. 00062 * 00063 * 00064 */ 00065 00066 #ifndef _SYS_ATOM_H_ 00067 #error "Do not include this file directly. Use sys/atom.h instead!" 00068 #endif 00069 00070 #ifdef __GNUC__ 00071 00072 #define NutEnterCritical() \ 00073 { \ 00074 int temp_; \ 00075 asm volatile ( \ 00076 "@ NutEnterCritical" "\n\t" \ 00077 "mrs %0, cpsr" "\n\t" \ 00078 "stmfd sp!, {%0}" "\n\t" \ 00079 "orr %0, %0, #0xC0" "\n\t" \ 00080 "msr cpsr, %0" "\n\t" \ 00081 : "=r" (temp_) : : "memory", "cc"); \ 00082 } 00083 00084 #define NutExitCritical() \ 00085 { \ 00086 int temp_; \ 00087 asm volatile ( \ 00088 "@ NutExitCritical" "\n\t" \ 00089 "ldmfd sp!, {%0}" "\n\t" \ 00090 "msr cpsr, %0" "\n\t" \ 00091 : "=r" (temp_) : : "memory", "cc"); \ 00092 } 00093 00094 #define NutJumpOutCritical() NutExitCritical() 00095 00096 #else /* __IMAGECRAFT__ */ 00097 00098 #define NutEnterCritical() \ 00099 asm("; NutEnterCritical\n" \ 00100 "mrs r12, cpsr\n" \ 00101 "orr r12, r12, #0xC0\n" \ 00102 "msr cpsr_c, r12") 00103 00104 #define NutExitCritical() \ 00105 asm("; NutExitCritical\n" \ 00106 "mrs r12, cpsr\n" \ 00107 "bic r12, r12, #0xC0\n" \ 00108 "msr cpsr_c, r12") 00109 00110 #endif