base/include/asm-arm/rtai_shm.h

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/*
 * Shared memory.
 *
 * Original RTAI/x86 layer implementation:
 *   Copyright (c) 2000 Paolo Mantegazza (mantegazza@aero.polimi.it)
 *   Copyright (c) 2000 Steve Papacharalambous (stevep@zentropix.com)
 *   Copyright (c) 2000 Stuart Hughes
 *   and others.
 *
 * RTAI/x86 rewrite over Adeos:
 *   Copyright (c) 2002 Philippe Gerum (rpm@xenomai.org)
 *
 * Original RTAI/ARM RTHAL implementation:
 *   Copyright (c) 2000 Pierre Cloutier (pcloutier@poseidoncontrols.com)
 *   Copyright (c) 2001 Alex Züpke, SYSGO RTS GmbH (azu@sysgo.de)
 *   Copyright (c) 2002 Guennadi Liakhovetski DSA GmbH (gl@dsa-ac.de)
 *   Copyright (c) 2002 Steve Papacharalambous (stevep@zentropix.com)
 *   Copyright (c) 2002 Wolfgang Müller (wolfgang.mueller@dsa-ac.de)
 *   Copyright (c) 2003 Bernard Haible, Marconi Communications
 *   Copyright (c) 2003 Thomas Gleixner (tglx@linutronix.de)
 *   Copyright (c) 2003 Philippe Gerum (rpm@xenomai.org)
 *
 * RTAI/ARM over Adeos rewrite:
 *   Copyright (c) 2004-2005 Michael Neuhauser, Firmix Software GmbH (mike@firmix.at)
 *
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge MA 02139, USA; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program 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 General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place - Suite 330, Boston, MA 02111-1307, USA.
 */
#ifndef _RTAI_ASM_ARM_SHM_H
#define _RTAI_ASM_ARM_SHM_H

#undef __SHM_USE_VECTOR /* not yet implemented for arm ... */

#ifdef __KERNEL__

#define RTAI_SHM_HANDLER        shm_handler
#define DEFINE_SHM_HANDLER

#else /* !__KERNEL__ */

#ifdef __SHM_USE_VECTOR
#include <asm/rtai_vectors.h>
#define rtai_shmrq(srq, whatever)   rtai_do_swi((srq)|(RTAI_SHM_VECTOR << 24), whatever)
#endif

#endif  /* __KERNEL__ */

/* convert virtual user memory address to physical address */
/* (virt_to_phys only works for kmalloced kernel memory) */

static inline unsigned long uvirt_to_kva(pgd_t *pgd, unsigned long adr)
{
    unsigned long ret = 0UL;
    pmd_t *pmd;
    pte_t *ptep, pte;

    if(!pgd_none(*pgd)) {
        pmd = pmd_offset(pgd, adr);
        if (!pmd_none(*pmd)) {
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
            ptep = pte_offset(pmd, adr);
#else /* >= 2.6.0 */
            ptep = pte_offset_kernel(pmd, adr);
#endif /* < 2.6.0 */
            pte = *ptep;
            if(pte_present(pte)){
                ret = (unsigned long) page_address(pte_page(pte));
                ret |= (adr&(PAGE_SIZE-1));
            }
        }
    }
    return ret;
}

#ifndef VMALLOC_VMADDR
#define VMALLOC_VMADDR(x) ((unsigned long)(x))
#endif

static inline unsigned long kvirt_to_pa(unsigned long adr)
{
    unsigned long va, kva, ret;

    va = VMALLOC_VMADDR(adr);
    kva = uvirt_to_kva(pgd_offset_k(va), va);
    ret = __pa(kva);

    return ret;
}

#endif  /* _RTAI_ASM_ARM_SHM_H */

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