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>
37 #include <sys/vmmeter.h>
39 #include <machine/atomic.h>
41 #include <vm/vm_page.h>
44 typedef unsigned long linux_pte_t;
45 typedef unsigned long linux_pmd_t;
46 typedef unsigned long linux_pgd_t;
47 typedef unsigned long pgprot_t;
51 #define LINUXKPI_PROT_VALID (1 << 4)
52 #define LINUXKPI_CACHE_MODE_SHIFT 3
54 static inline pgprot_t
55 cachemode2protval(vm_memattr_t attr)
57 return ((attr | LINUXKPI_PROT_VALID) << LINUXKPI_CACHE_MODE_SHIFT);
60 static inline vm_memattr_t
61 pgprot2cachemode(pgprot_t prot)
65 val = prot >> LINUXKPI_CACHE_MODE_SHIFT;
67 if (val & LINUXKPI_PROT_VALID)
68 return (val & ~LINUXKPI_PROT_VALID);
70 return (VM_MEMATTR_DEFAULT);
73 #define virt_to_page(x) PHYS_TO_VM_PAGE(vtophys((x)))
74 #define page_to_pfn(pp) (VM_PAGE_TO_PHYS((pp)) >> PAGE_SHIFT)
75 #define pfn_to_page(pfn) (PHYS_TO_VM_PAGE((pfn) << PAGE_SHIFT))
76 #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
78 #define clear_page(page) memset((page), 0, PAGE_SIZE)
79 #define pgprot_noncached(prot) ((pgprot_t)VM_MEMATTR_UNCACHEABLE)
80 #define pgprot_writecombine(prot) ((pgprot_t)VM_MEMATTR_WRITE_COMBINING)
83 #define PAGE_MASK (~(PAGE_SIZE-1))
85 * Modifying PAGE_MASK in the above way breaks trunc_page, round_page,
86 * and btoc macros. Therefore, redefine them in a way that makes sense
87 * so the LinuxKPI consumers don't get totally broken behavior.
90 #define btoc(x) (((vm_offset_t)(x) + PAGE_SIZE - 1) >> PAGE_SHIFT)
92 #define round_page(x) ((((uintptr_t)(x)) + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1))
94 #define trunc_page(x) ((uintptr_t)(x) & ~(PAGE_SIZE - 1))
96 #endif /* _LINUX_PAGE_H_ */