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 * Copyright (c) 2014-2020 François Tigeot <ftigeot@wolfpond.org>
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice unmodified, this list of conditions, and the following
14 * 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 AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30 #ifndef _LINUX_KERNEL_H_
31 #define _LINUX_KERNEL_H_
32
33 #include <sys/stdarg.h>
34 #include <linux/stddef.h>
35 #include <linux/types.h>
36 #include <linux/compiler.h>
37 #include <linux/bitops.h>
38 #include <linux/log2.h>
39 #include <linux/typecheck.h>
40 #include <linux/printk.h>
41
42 #include <sys/systm.h>
43 #include <sys/param.h>
44 #include <sys/libkern.h>
45 #include <sys/stat.h>
46 #include <sys/endian.h>
47
48 #define U8_MAX ((u8)~0U)
49 #define U16_MAX ((u16)~0U)
50 #define U32_MAX ((u32)~0U)
51 #define U64_MAX ((u64)~0ULL)
52 #define S64_MAX ((s64)(U64_MAX>>1))
53
54 #include <machine/limits.h> /* LONG_MAX etc... */
55
56 #undef ALIGN
57 #define ALIGN(x, y) roundup2((x), (y))
58 #define IS_ALIGNED(x, y) (((x) & ((y) - 1)) == 0)
59 #define DIV_ROUND_UP howmany
60 #define DIV_ROUND_UP_ULL(X, N) DIV_ROUND_UP((unsigned long long)(X), (N))
61
62 #define udelay(t) DELAY(t)
63
64 #define container_of(ptr, type, member) \
65 ({ \
66 __typeof(((type *)0)->member) *_p = (ptr); \
67 (type *)((char *)_p - offsetof(type, member)); \
68 })
69
70 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
71
72 #define simple_strtoul strtoul
73 #define simple_strtol strtol
74
75 #define min(x, y) ((x) < (y) ? (x) : (y))
76 #define max(x, y) ((x) > (y) ? (x) : (y))
77
78 #define min3(a, b, c) min(a, min(b,c))
79 #define max3(a, b, c) max(a, max(b,c))
80
81 #define min_t(type, _x, _y) ((type)(_x) < (type)(_y) ? (type)(_x) : (type)(_y))
82 #define max_t(type, _x, _y) ((type)(_x) > (type)(_y) ? (type)(_x) : (type)(_y))
83
84 #define clamp_t(type, _x, min, max) min_t(type, max_t(type, _x, min), max)
85 #define clamp(x, lo, hi) min( max(x,lo), hi)
86 #define clamp_val(val, lo, hi) clamp_t(typeof(val), val, lo, hi)
87
88 /*
89 * This looks more complex than it should be. But we need to
90 * get the type for the ~ right in round_down (it needs to be
91 * as wide as the result!), and we want to evaluate the macro
92 * arguments just once each.
93 */
94 #define __round_mask(x, y) ((__typeof__(x))((y)-1))
95 #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
96 #define round_down(x, y) ((x) & ~__round_mask(x, y))
97
98 #define num_possible_cpus() mp_ncpus
99
100 typedef struct pm_message {
101 int event;
102 } pm_message_t;
103
104 /* Swap values of a and b */
105 #define swap(a, b) \
106 ({ \
107 typeof(a) _swap_tmp = a; \
108 a = b; \
109 b = _swap_tmp; \
110 })
111
112 #define DIV_ROUND_CLOSEST(x, divisor) (((x) + ((divisor) /2)) / (divisor))
113
114 static inline uintmax_t
mult_frac(uintmax_t x,uintmax_t multiplier,uintmax_t divisor)115 mult_frac(uintmax_t x, uintmax_t multiplier, uintmax_t divisor)
116 {
117 uintmax_t q = (x / divisor);
118 uintmax_t r = (x % divisor);
119
120 return ((q * multiplier) + ((r * multiplier) / divisor));
121 }
122
abs64(int64_t x)123 static inline int64_t abs64(int64_t x)
124 {
125 return (x < 0 ? -x : x);
126 }
127
128 #define DIV_ROUND_CLOSEST_ULL(ll, d) \
129 ({ unsigned long long _tmp = (ll)+(d)/2; do_div(_tmp, d); _tmp; })
130
131 #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))
132 #define lower_32_bits(n) ((u32)(n))
133
134 /* Byteorder compat layer */
135 #if _BYTE_ORDER == _BIG_ENDIAN
136 #define __BIG_ENDIAN 4321
137 #else
138 #define __LITTLE_ENDIAN 1234
139 #endif
140
141 #define cpu_to_le16(x) htole16(x)
142 #define le16_to_cpu(x) le16toh(x)
143 #define cpu_to_le32(x) htole32(x)
144 #define le32_to_cpu(x) le32toh(x)
145 #define le32_to_cpup(x) le32toh(*x)
146
147 #define cpu_to_be16(x) htobe16(x)
148 #define be16_to_cpu(x) be16toh(x)
149 #define cpu_to_be32(x) htobe32(x)
150 #define be32_to_cpu(x) be32toh(x)
151 #define be32_to_cpup(x) be32toh(*x)
152
153 static inline int __must_check
kstrtouint(const char * s,unsigned int base,unsigned int * res)154 kstrtouint(const char *s, unsigned int base, unsigned int *res)
155 {
156 *(res) = strtol(s,0,base);
157
158 return 0;
159 }
160
161 char *kvasprintf(int flags, const char *format, va_list ap);
162 char *kasprintf(int flags, const char *format, ...);
163
164 static inline void __user *
u64_to_user_ptr(u64 address)165 u64_to_user_ptr(u64 address)
166 {
167 return (void __user *)(uintptr_t)address;
168 }
169
170 static inline void
might_sleep(void)171 might_sleep(void)
172 {
173 }
174
175 #define might_sleep_if(cond)
176
177 #define snprintf ksnprintf
178 #define sprintf ksprintf
179
180 static inline int __printf(3, 0)
vsnprintf(char * buf,size_t size,const char * fmt,va_list args)181 vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
182 {
183 return kvsnprintf(buf, size, fmt, args);
184 }
185
186 static inline int __printf(3, 0)
vscnprintf(char * buf,size_t size,const char * fmt,va_list args)187 vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
188 {
189 int ret;
190
191 if (size == 0)
192 return 0;
193
194 ret = vsnprintf(buf, size, fmt, args);
195 if (ret < size)
196 return ret;
197
198 return size - 1;
199 }
200
201 static inline int __printf(3, 4)
scnprintf(char * buf,size_t size,const char * fmt,...)202 scnprintf(char *buf, size_t size, const char *fmt, ...)
203 {
204 va_list args;
205 int i;
206
207 va_start(args, fmt);
208 i = vscnprintf(buf, size, fmt, args);
209 va_end(args);
210
211 return (i);
212 }
213
214 static inline int
kstrtol(const char * cp,unsigned int base,long * res)215 kstrtol(const char *cp, unsigned int base, long *res)
216 {
217 char *end;
218
219 *res = strtol(cp, &end, base);
220
221 /* skip newline character, if any */
222 if (*end == '\n')
223 end++;
224 if (*cp == 0 || *end != 0)
225 return (-EINVAL);
226 return (0);
227 }
228
229 #define oops_in_progress (panicstr != NULL)
230
231 enum lockdep_ok {
232 LOCKDEP_STILL_OK,
233 LOCKDEP_NOW_UNRELIABLE
234 };
235
236 #define TAINT_MACHINE_CHECK 4
237
238 static inline void
add_taint(unsigned flag,enum lockdep_ok lo)239 add_taint(unsigned flag, enum lockdep_ok lo)
240 {
241 }
242
243 #define STUB() do { kprintf("%s: stub\n", __func__); } while(0);
244
245 #endif /* _LINUX_KERNEL_H_ */
246