1 /*- 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. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice unmodified, this list of conditions, and the following 13 * disclaimer. 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. 17 * 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. 28 * 29 * $FreeBSD$ 30 */ 31 #ifndef _LINUX_PAGE_H_ 32 #define _LINUX_PAGE_H_ 33 34 #include <linux/types.h> 35 36 #include <sys/param.h> 37 #include <sys/vmmeter.h> 38 39 #include <machine/atomic.h> 40 #include <vm/vm.h> 41 #include <vm/vm_page.h> 42 #include <vm/pmap.h> 43 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; 48 49 #define page vm_page 50 51 #define LINUXKPI_PROT_VALID (1 << 4) 52 #define LINUXKPI_CACHE_MODE_SHIFT 3 53 54 static inline pgprot_t 55 cachemode2protval(vm_memattr_t attr) 56 { 57 return ((attr | LINUXKPI_PROT_VALID) << LINUXKPI_CACHE_MODE_SHIFT); 58 } 59 60 static inline vm_memattr_t 61 pgprot2cachemode(pgprot_t prot) 62 { 63 int val; 64 65 val = prot >> LINUXKPI_CACHE_MODE_SHIFT; 66 67 if (val & LINUXKPI_PROT_VALID) 68 return (val & ~LINUXKPI_PROT_VALID); 69 else 70 return (VM_MEMATTR_DEFAULT); 71 } 72 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)) 77 78 #define clear_page(page) memset((page), 0, PAGE_SIZE) 79 #define pgprot_noncached(prot) \ 80 ((prot) | cachemode2protval(VM_MEMATTR_UNCACHEABLE)) 81 #define pgprot_writecombine(prot) \ 82 ((prot) | cachemode2protval(VM_MEMATTR_WRITE_COMBINING)) 83 84 #undef PAGE_MASK 85 #define PAGE_MASK (~(PAGE_SIZE-1)) 86 /* 87 * Modifying PAGE_MASK in the above way breaks trunc_page, round_page, 88 * and btoc macros. Therefore, redefine them in a way that makes sense 89 * so the LinuxKPI consumers don't get totally broken behavior. 90 */ 91 #undef btoc 92 #define btoc(x) (((vm_offset_t)(x) + PAGE_SIZE - 1) >> PAGE_SHIFT) 93 #undef round_page 94 #define round_page(x) ((((uintptr_t)(x)) + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1)) 95 #undef trunc_page 96 #define trunc_page(x) ((uintptr_t)(x) & ~(PAGE_SIZE - 1)) 97 98 #endif /* _LINUX_PAGE_H_ */ 99