1 /*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2014-2016 François Tigeot 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 #ifndef _LINUX_KERNEL_H_ 30 #define _LINUX_KERNEL_H_ 31 32 #include <sys/systm.h> 33 #include <sys/param.h> 34 #include <sys/libkern.h> 35 #include <sys/stat.h> 36 #include <sys/endian.h> 37 38 #include <linux/bitops.h> 39 #include <linux/compiler.h> 40 #include <linux/log2.h> 41 #include <linux/types.h> 42 #include <linux/printk.h> 43 44 #define U64_MAX ((u64)~0ULL) 45 46 #undef ALIGN 47 #define ALIGN(x, y) roundup2((x), (y)) 48 #define IS_ALIGNED(x, y) (((x) & ((y) - 1)) == 0) 49 #define DIV_ROUND_UP howmany 50 #define DIV_ROUND_UP_ULL(X, N) DIV_ROUND_UP((unsigned long long)(X), (N)) 51 52 #define udelay(t) DELAY(t) 53 54 #define container_of(ptr, type, member) \ 55 ({ \ 56 __typeof(((type *)0)->member) *_p = (ptr); \ 57 (type *)((char *)_p - offsetof(type, member)); \ 58 }) 59 60 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) 61 62 #define simple_strtoul strtoul 63 #define simple_strtol strtol 64 65 #define min(x, y) ((x) < (y) ? (x) : (y)) 66 #define max(x, y) ((x) > (y) ? (x) : (y)) 67 68 #define min3(a, b, c) min(a, min(b,c)) 69 #define max3(a, b, c) max(a, max(b,c)) 70 71 #define min_t(type, _x, _y) ((type)(_x) < (type)(_y) ? (type)(_x) : (type)(_y)) 72 #define max_t(type, _x, _y) ((type)(_x) > (type)(_y) ? (type)(_x) : (type)(_y)) 73 74 #define clamp_t(type, _x, min, max) min_t(type, max_t(type, _x, min), max) 75 #define clamp(x, lo, hi) min( max(x,lo), hi) 76 77 /* 78 * This looks more complex than it should be. But we need to 79 * get the type for the ~ right in round_down (it needs to be 80 * as wide as the result!), and we want to evaluate the macro 81 * arguments just once each. 82 */ 83 #define __round_mask(x, y) ((__typeof__(x))((y)-1)) 84 #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1) 85 #define round_down(x, y) ((x) & ~__round_mask(x, y)) 86 87 #define num_possible_cpus() mp_ncpus 88 89 typedef struct pm_message { 90 int event; 91 } pm_message_t; 92 93 /* Swap values of a and b */ 94 #define swap(a, b) \ 95 ({ \ 96 typeof(a) _swap_tmp = a; \ 97 a = b; \ 98 b = _swap_tmp; \ 99 }) 100 101 #define DIV_ROUND_CLOSEST(x, divisor) (((x) + ((divisor) /2)) / (divisor)) 102 103 static inline uintmax_t 104 mult_frac(uintmax_t x, uintmax_t multiplier, uintmax_t divisor) 105 { 106 uintmax_t q = (x / divisor); 107 uintmax_t r = (x % divisor); 108 109 return ((q * multiplier) + ((r * multiplier) / divisor)); 110 } 111 112 static inline int64_t abs64(int64_t x) 113 { 114 return (x < 0 ? -x : x); 115 } 116 117 #define DIV_ROUND_CLOSEST_ULL(ll, d) \ 118 ({ unsigned long long _tmp = (ll)+(d)/2; do_div(_tmp, d); _tmp; }) 119 120 #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16)) 121 #define lower_32_bits(n) ((u32)(n)) 122 123 /* Byteorder compat layer */ 124 #if _BYTE_ORDER == _BIG_ENDIAN 125 #define __BIG_ENDIAN 4321 126 #else 127 #define __LITTLE_ENDIAN 1234 128 #endif 129 130 #define cpu_to_le16(x) htole16(x) 131 #define le16_to_cpu(x) le16toh(x) 132 #define cpu_to_le32(x) htole32(x) 133 #define le32_to_cpu(x) le32toh(x) 134 #define le32_to_cpup(x) le32toh(*x) 135 136 #define cpu_to_be16(x) htobe16(x) 137 #define be16_to_cpu(x) be16toh(x) 138 #define cpu_to_be32(x) htobe32(x) 139 #define be32_to_cpu(x) be32toh(x) 140 #define be32_to_cpup(x) be32toh(*x) 141 142 #endif /* _LINUX_KERNEL_H_ */ 143