rtai-core/include/asm-ppc/rtai_srq.h

00001 /*
00002 COPYRIGHT (C) 2000  Paolo Mantegazza (mantegazza@aero.polimi.it)
00003 
00004 This library is free software; you can redistribute it and/or
00005 modify it under the terms of the GNU Lesser General Public
00006 License as published by the Free Software Foundation; either
00007 version 2 of the License, or (at your option) any later version.
00008 
00009 This library is distributed in the hope that it will be useful,
00010 but WITHOUT ANY WARRANTY; without even the implied warranty of
00011 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012 Lesser General Public License for more details.
00013 
00014 You should have received a copy of the GNU Lesser General Public
00015 License along with this library; if not, write to the Free Software
00016 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
00017 */
00018 
00019 
00020 #ifndef _RTAI_SRQ_H_
00021 #define _RTAI_SRQ_H_
00022 
00023 // the following function is adapted from Linux PPC unistd.h 
00024 static inline long long rtai_srq(unsigned long srq, unsigned long whatever)
00025 {
00026         long long retval;
00027         register unsigned long __sc_0 __asm__ ("r0");
00028         register unsigned long __sc_3 __asm__ ("r3");
00029         register unsigned long __sc_4 __asm__ ("r4");
00030 
00031         __sc_0 = (__sc_3 = srq) + (__sc_4 = whatever);
00032         __asm__ __volatile__
00033                 ("trap         \n\t"
00034                 : "=&r" (__sc_3), "=&r" (__sc_4)
00035                 : "0"   (__sc_3), "1"   (__sc_4),
00036                   "r"   (__sc_0)
00037                 : "r0", "r3", "r4" );
00038         ((unsigned long *)&retval)[0] = __sc_3;
00039         ((unsigned long *)&retval)[1] = __sc_4;
00040         return retval;
00041 }
00042 
00043 static inline int rtai_open_srq(unsigned int label)
00044 {
00045         return (int)rtai_srq(0, label);
00046 }
00047 #endif

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