2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013-2016 Mellanox Technologies, Ltd.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice unmodified, this list of conditions, and the following
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 #ifndef _LINUX_PAGE_H_
32 #define _LINUX_PAGE_H_
34 #include <linux/types.h>
36 #include <sys/param.h>
38 #include <machine/atomic.h>
40 #include <vm/vm_page.h>
43 typedef unsigned long pgprot_t;
47 #define virt_to_page(x) PHYS_TO_VM_PAGE(vtophys((x)))
48 #define page_to_pfn(pp) (VM_PAGE_TO_PHYS((pp)) >> PAGE_SHIFT)
49 #define pfn_to_page(pfn) (PHYS_TO_VM_PAGE((pfn) << PAGE_SHIFT))
50 #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
52 #define clear_page(page) memset((page), 0, PAGE_SIZE)
53 #define pgprot_noncached(prot) ((pgprot_t)VM_MEMATTR_UNCACHEABLE)
54 #define pgprot_writecombine(prot) ((pgprot_t)VM_MEMATTR_WRITE_COMBINING)
57 #define PAGE_MASK (~(PAGE_SIZE-1))
59 * Modifying PAGE_MASK in the above way breaks trunc_page, round_page,
60 * and btoc macros. Therefore, redefine them in a way that makes sense
61 * so the LinuxKPI consumers don't get totally broken behavior.
64 #define btoc(x) (((vm_offset_t)(x) + PAGE_SIZE - 1) >> PAGE_SHIFT)
66 #define round_page(x) ((((uintptr_t)(x)) + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1))
68 #define trunc_page(x) ((uintptr_t)(x) & ~(PAGE_SIZE - 1))
70 #endif /* _LINUX_PAGE_H_ */