base/include/asm-ppc/rtai_srq.h

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/*
 * COPYRIGHT (C) 2000-2007  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_ASM_PPC_SRQ_H_
#define _RTAI_ASM_PPC_SRQ_H_

#ifndef __KERNEL__

#include <sys/syscall.h>
#include <unistd.h>

#include <asm/rtai_vectors.h>

#ifdef CONFIG_RTAI_LXRT_USE_LINUX_SYSCALL
#define USE_LINUX_SYSCALL
#else
#undef USE_LINUX_SYSCALL
#endif

#define RTAI_SRQ_SYSCALL_NR  0x70000001

// the following function is adapted from Linux PPC unistd.h 
static inline long long rtai_srq(long srq, unsigned long args)
{
    long long retval;
#if 1 //def USE_LINUX_SYSCALL
        syscall(RTAI_SRQ_SYSCALL_NR, srq, args, &retval);
#else
    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 = args);
    __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;
#endif
    return retval;
}

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

#endif /* !__KERNEL__ */

#endif /* !_RTAI_ASM_PPC_SRQ_H */

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