2 * Copyright (c) 2015 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 Copyright (c) 2001, 2002, 2003 Eliot Dresselhaus
18 Permission is hereby granted, free of charge, to any person obtaining
19 a copy of this software and associated documentation files (the
20 "Software"), to deal in the Software without restriction, including
21 without limitation the rights to use, copy, modify, merge, publish,
22 distribute, sublicense, and/or sell copies of the Software, and to
23 permit persons to whom the Software is furnished to do so, subject to
24 the following conditions:
26 The above copyright notice and this permission notice shall be
27 included in all copies or substantial portions of the Software.
29 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
30 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
31 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
32 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
33 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
34 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
35 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
38 #ifndef included_clib_h
39 #define included_clib_h
42 #include <vppinfra/config.h>
45 #include <x86intrin.h>
48 /* Standalone means to not assume we are running on a Unix box. */
49 #if ! defined (CLIB_STANDALONE) && ! defined (CLIB_LINUX_KERNEL)
53 #include <vppinfra/types.h>
54 #include <vppinfra/atomics.h>
56 /* Global DEBUG flag. Setting this to 1 or 0 turns off
57 ASSERT (see vppinfra/error.h) & other debugging code. */
63 #define NULL ((void *) 0)
66 #define BITS(x) (8*sizeof(x))
67 #define ARRAY_LEN(x) (sizeof (x)/sizeof (x[0]))
69 #define _STRUCT_FIELD(t,f) (((t *) 0)->f)
70 #define STRUCT_OFFSET_OF(t,f) offsetof(t, f)
71 #define STRUCT_BIT_OFFSET_OF(t,f) (BITS(u8) * STRUCT_OFFSET_OF (t, f))
72 #define STRUCT_SIZE_OF(t,f) (sizeof (_STRUCT_FIELD (t, f)))
73 #define STRUCT_BITS_OF(t,f) (BITS (_STRUCT_FIELD (t, f)))
74 #define STRUCT_ARRAY_LEN(t,f) ARRAY_LEN (_STRUCT_FIELD (t, f))
75 #define STRUCT_MARK(mark) u8 mark[0]
76 #define STRUCT_MARK_PTR(v, f) &(v)->f
78 /* Stride in bytes between struct array elements. */
79 #define STRUCT_STRIDE_OF(t,f) \
80 ( ((uword) & (((t *) 0)[1].f)) \
81 - ((uword) & (((t *) 0)[0].f)))
83 #define STRUCT_OFFSET_OF_VAR(v,f) ((uword) (&(v)->f) - (uword) (v))
85 /* Used to pack structure elements. */
86 #define CLIB_PACKED(x) x __attribute__ ((packed))
87 #define CLIB_UNUSED(x) x __attribute__ ((unused))
89 /* similar to CLIB_CACHE_LINE_ALIGN_MARK() but with arbitrary alignment */
90 #define CLIB_ALIGN_MARK(name, alignment) u8 name[0] __attribute__((aligned(alignment)))
92 /* Make a string from the macro's argument */
93 #define CLIB_STRING_MACRO(x) #x
95 #define __clib_unused __attribute__ ((unused))
96 #define __clib_weak __attribute__ ((weak))
97 #define __clib_packed __attribute__ ((packed))
98 #define __clib_constructor __attribute__ ((constructor))
99 #define __clib_noinline __attribute__ ((noinline))
100 #define __clib_aligned(x) __attribute__ ((aligned(x)))
101 #define __clib_section(s) __attribute__ ((section(s)))
102 #define __clib_warn_unused_result __attribute__ ((warn_unused_result))
104 #define never_inline __attribute__ ((__noinline__))
107 #define always_inline static inline
108 #define static_always_inline static inline
110 #define always_inline static inline __attribute__ ((__always_inline__))
111 #define static_always_inline static inline __attribute__ ((__always_inline__))
115 /* Reserved (unused) structure element with address offset between
117 #define CLIB_PAD_FROM_TO(from,to) u8 pad_##from[(to) - (from)]
119 /* Hints to compiler about hot/cold code. */
120 #define PREDICT_FALSE(x) __builtin_expect((x),0)
121 #define PREDICT_TRUE(x) __builtin_expect((x),1)
125 * prevent compiler to reorder memory access accross this boundary
126 * prevent compiler to cache values in register (force reload)
127 * Not to be confused with CPU memory barrier below
129 #define CLIB_COMPILER_BARRIER() asm volatile ("":::"memory")
131 /* Full memory barrier (read and write). */
132 #define CLIB_MEMORY_BARRIER() __sync_synchronize ()
135 #define CLIB_MEMORY_STORE_BARRIER() __builtin_ia32_sfence ()
137 #define CLIB_MEMORY_STORE_BARRIER() __sync_synchronize ()
140 /* Arranges for function to be called before main. */
141 #define INIT_FUNCTION(decl) \
142 decl __attribute ((constructor)); \
145 /* Arranges for function to be called before exit. */
146 #define EXIT_FUNCTION(decl) \
147 decl __attribute ((destructor)); \
150 /* Use __builtin_clz if available. */
152 #define count_leading_zeros(x) __builtin_clzll (x)
153 #define count_trailing_zeros(x) __builtin_ctzll (x)
155 #define count_leading_zeros(x) __builtin_clzl (x)
156 #define count_trailing_zeros(x) __builtin_ctzl (x)
159 #if defined (count_leading_zeros)
164 n = count_leading_zeros (x);
165 return BITS (uword) - n - 1;
171 uword a = x, b = BITS (uword) / 2, c = 0, r = 0;
173 /* Reduce x to 4 bit result. */
182 if (BITS (uword) > 32)
189 /* Do table lookup on 4 bit partial. */
190 if (BITS (uword) > 32)
192 const u64 table = 0x3333333322221104LL;
193 uword t = (table >> (4 * a)) & 0xf;
194 r = t < 4 ? r + t : ~0;
198 const u32 table = 0x22221104;
199 uword t = (a & 8) ? 3 : ((table >> (4 * a)) & 0xf);
200 r = t < 4 ? r + t : ~0;
210 uword l = min_log2 (x);
211 if (x > ((uword) 1 << l))
219 if (BITS (uword) == 64)
239 return ((uword) 1 << x) - (uword) 1;
245 word y = (word) 1 << min_log2 (x);
254 return 0 == (x & (x - 1));
258 round_down_pow2 (uword x, uword pow2)
260 return (x) & ~(pow2 - 1);
264 round_pow2 (uword x, uword pow2)
266 return (x + pow2 - 1) & ~(pow2 - 1);
270 round_pow2_u64 (u64 x, u64 pow2)
272 return (x + pow2 - 1) & ~(pow2 - 1);
282 log2_first_set (uword x)
285 #ifdef count_trailing_zeros
286 result = count_trailing_zeros (x);
288 result = min_log2 (first_set (x));
294 flt_round_down (f64 x)
300 flt_round_nearest (f64 x)
302 return (word) (x + .5);
306 flt_round_to_multiple (f64 x, f64 f)
308 return f * flt_round_nearest (x / f);
312 extract_bits (uword x, int start, int count)
315 return _bextr_u64 (x, start, count);
317 return (x >> start) & pow2_mask (count);
320 #define clib_max(x,y) \
322 __typeof__ (x) _x = (x); \
323 __typeof__ (y) _y = (y); \
327 #define clib_min(x,y) \
329 __typeof__ (x) _x = (x); \
330 __typeof__ (y) _y = (y); \
334 #define clib_abs(x) \
336 __typeof__ (x) _x = (x); \
340 /* Standard standalone-only function declarations. */
342 void clib_standalone_init (void *memory, uword memory_bytes);
344 void qsort (void *base, uword n, uword size,
345 int (*)(const void *, const void *));
348 /* Stack backtrace. */
350 clib_backtrace (uword * callers, uword max_callers, uword n_frames_to_skip);
352 #endif /* included_clib_h */
355 * fd.io coding-style-patch-verification: ON
358 * eval: (c-set-style "gnu")