FreeBSD/Linux Kernel Cross Reference
sys/compat/linuxkpi/common/include/linux/pfn_t.h

     /*-
      * Copyright (c) 2017 Mellanox Technologies, Ltd.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice unmodified, this list of conditions, and the following
     *    disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #ifndef _LINUXKPI_LINUX_PFN_T_H_
    #define _LINUXKPI_LINUX_PFN_T_H_
    
    #include <linux/mm.h>
    
    CTASSERT(PAGE_SHIFT > 4);
    
    #define PFN_FLAGS_MASK (((u64)(PAGE_SIZE - 1)) << (64 - PAGE_SHIFT))
    #define PFN_SG_CHAIN (1ULL << (64 - 1))
    #define PFN_SG_LAST (1ULL << (64 - 2))
    #define PFN_DEV (1ULL << (64 - 3))
    #define PFN_MAP (1ULL << (64 - 4))
    
    static inline pfn_t
    __pfn_to_pfn_t(unsigned long pfn, u64 flags)
    {
            pfn_t pfn_t = { pfn | (flags & PFN_FLAGS_MASK) };
    
            return (pfn_t);
    }
    
    static inline pfn_t
    pfn_to_pfn_t(unsigned long pfn)
    {
            return (__pfn_to_pfn_t (pfn, 0));
    }
    
    #endif                                  /* _LINUXKPI_LINUX_PFN_T_H_ */

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