base/include/asm-ppc/rtai_srq.h

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/*
COPYRIGHT (C) 2000  Paolo Mantegazza (mantegazza@aero.polimi.it)

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
*/


#ifndef _RTAI_SRQ_H_
#define _RTAI_SRQ_H_

// the following function is adapted from Linux PPC unistd.h 
static inline long long rtai_srq(unsigned long srq, unsigned long whatever)
{
    long long retval;
    register unsigned long __sc_0 __asm__ ("r0");
    register unsigned long __sc_3 __asm__ ("r3");
    register unsigned long __sc_4 __asm__ ("r4");

    __sc_0 = (__sc_3 = srq) + (__sc_4 = whatever);
    __asm__ __volatile__
        ("trap         \n\t"
        : "=&r" (__sc_3), "=&r" (__sc_4)
        : "0"   (__sc_3), "1"   (__sc_4),
              "r"   (__sc_0)
        /*: "r0", "r3", "r4"*/ );
    ((unsigned long *)(void *)&retval)[0] = __sc_3;
    ((unsigned long *)(void *)&retval)[1] = __sc_4;
    return retval;
}

static inline int rtai_open_srq(unsigned int label)
{
    return (int)rtai_srq(0, label);
}
#endif

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