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      1 /*	$NetBSD: page.h,v 1.3 2021/12/19 01:18:45 riastradh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2014 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_PAGE_H_
     33 #define _ASM_PAGE_H_
     34 
     35 #include <sys/bitops.h>
     36 #include <sys/bus.h>
     37 
     38 #include <uvm/uvm_page.h>
     39 
     40 #include <linux/mm_types.h>
     41 
     42 /*
     43  * XXX Not sure why this is here, but so it is in Linux...  Also, not
     44  * sure what the right type is: Linux uses dma_addr_t, but I don't
     45  * think bus_addr_t is right here -- paddr_t sounds more appropriate.
     46  */
     47 
     48 static inline bus_addr_t
     49 page_to_phys(struct page *page)
     50 {
     51 	return VM_PAGE_TO_PHYS(&page->p_vmp);
     52 }
     53 
     54 static inline unsigned long
     55 page_to_pfn(struct page *page)
     56 {
     57 	return (page_to_phys(page) >> PAGE_SHIFT);
     58 }
     59 
     60 static inline size_t
     61 get_order(size_t n)
     62 {
     63 	return fls64((n - 1) >> PAGE_SHIFT);
     64 }
     65 
     66 #endif	/* _ASM_PAGE_H_ */
     67