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io.h revision 1.2.4.2 
      1 /*	$NetBSD: io.h,v 1.2.4.2 2014/05/18 17:46:01 rmind Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2013 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Taylor R. Campbell.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _ASM_IO_H_
     33 #define _ASM_IO_H_
     34 
     35 #include <sys/bus.h>
     36 
     37 #include <uvm/uvm_page.h>
     38 
     39 #include <linux/mm_types.h>
     40 
     41 /*
     42  * XXX This is bollocks, and is wrong on various architectures (should
     43  * work for x86; who knows what else), but bus_space_barrier won't work
     44  * because we have no bus space tag or handle or offset or anything.
     45  */
     46 #define	mmiowb()	__insn_barrier()
     47 
     48 #define	memcpy_fromio	memcpy
     49 #define	memcpy_toio	memcpy
     50 #define	memset_io	memset
     51 
     52 /*
     53  * XXX Not sure why this is here, but so it is in Linux...  Also, not
     54  * sure what the right type is: Linux uses dma_addr_t, but I don't
     55  * think bus_addr_t is right here -- paddr_t sounds more appropriate.
     56  */
     57 
     58 static inline bus_addr_t
     59 page_to_phys(struct page *page)
     60 {
     61 	return VM_PAGE_TO_PHYS(&page->p_vmp);
     62 }
     63 
     64 #endif  /* _ASM_IO_H_ */
     65