include/ust/kernelcompat.h

   1 /* Copyright (C) 2009  Pierre-Marc Fournier
   2  *
   3  * This library is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU Lesser General Public
   5  * License as published by the Free Software Foundation; either
   6  * version 2.1 of the License, or (at your option) any later version.
   7  *
   8  * This library is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * Lesser General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public
  14  * License along with this library; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
  16  */
  17
  18 #ifndef KERNELCOMPAT_H
  19 #define KERNELCOMPAT_H
  20
  21 #include <kcompat.h>
  22
  23 /* FIXME: libkcompat must not define arch-specific local ops, as ust *must*
  24  * fallback to the normal atomic ops. Fix things so we don't add them and
  25  * break things accidentally.
  26  */
  27
  28 #define container_of(ptr, type, member) ({                      \
  29         const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
  30         (type *)( (char *)__mptr - offsetof(type,member) );})
  31
  32 /* ERROR OPS */
  33 #define MAX_ERRNO       4095
  34
  35 #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
  36
  37 static inline void *ERR_PTR(long error)
  38 {
  39         return (void *) error;
  40 }
  41
  42 static inline long PTR_ERR(const void *ptr)
  43 {
  44         return (long) ptr;
  45 }
  46
  47 static inline long IS_ERR(const void *ptr)
  48 {
  49         return IS_ERR_VALUE((unsigned long)ptr);
  50 }
  51
  52
  53 /* Min / Max */
  54
  55 #define min_t(type, x, y) ({                    \
  56         type __min1 = (x);                      \
  57         type __min2 = (y);                      \
  58         __min1 < __min2 ? __min1: __min2; })
  59
  60 #define max_t(type, x, y) ({                    \
  61         type __max1 = (x);                      \
  62         type __max2 = (y);                      \
  63         __max1 > __max2 ? __max1: __max2; })
  64
  65
  66 /* MUTEXES */
  67
  68 #include <pthread.h>
  69
  70 #define DEFINE_MUTEX(m) pthread_mutex_t (m) = PTHREAD_MUTEX_INITIALIZER;
  71 #define DECLARE_MUTEX(m) extern pthread_mutex_t (m);
  72
  73 #define mutex_lock(m) pthread_mutex_lock(m)
  74
  75 #define mutex_unlock(m) pthread_mutex_unlock(m)
  76
  77
  78 /* MALLOCATION */
  79
  80 #define zmalloc(s) calloc(1, s)
  81
  82 /* ATTRIBUTES */
  83
  84 /* FIXME: define this */
  85 #define ____cacheline_aligned
  86
  87 /* MATH */
  88
  89 static inline unsigned int hweight32(unsigned int w)
  90 {
  91         unsigned int res = w - ((w >> 1) & 0x55555555);
  92         res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
  93         res = (res + (res >> 4)) & 0x0F0F0F0F;
  94         res = res + (res >> 8);
  95         return (res + (res >> 16)) & 0x000000FF;
  96 }
  97
  98 static inline int fls(int x)
  99 {
 100         int r;
 101 //ust// #ifdef CONFIG_X86_CMOV
 102         asm("bsrl %1,%0\n\t"
 103             "cmovzl %2,%0"
 104             : "=&r" (r) : "rm" (x), "rm" (-1));
 105 //ust// #else
 106 //ust//         asm("bsrl %1,%0\n\t"
 107 //ust//             "jnz 1f\n\t"
 108 //ust//             "movl $-1,%0\n"
 109 //ust//             "1:" : "=r" (r) : "rm" (x));
 110 //ust// #endif
 111         return r + 1;
 112 }
 113
 114 static __inline__ int get_count_order(unsigned int count)
 115 {
 116         int order;
 117
 118         order = fls(count) - 1;
 119         if (count & (count - 1))
 120                 order++;
 121         return order;
 122 }
 123
 124
 125
 126
 127 #include <unistd.h>
 128
 129 #define ALIGN(x,a)              __ALIGN_MASK(x,(typeof(x))(a)-1)
 130 #define __ALIGN_MASK(x,mask)    (((x)+(mask))&~(mask))
 131 #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
 132 #define PAGE_SIZE sysconf(_SC_PAGE_SIZE)
 133 #define PAGE_MASK (~(PAGE_SIZE-1))
 134
 135
 136
 137
 138 /* ARRAYS */
 139
 140 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
 141
 142 /* TRACE CLOCK */
 143
 144 /* There are two types of clocks that can be used.
 145    - TSC based clock
 146    - gettimeofday() clock
 147
 148    Microbenchmarks on Linux 2.6.30 on Core2 Duo 3GHz (functions are inlined):
 149      Calls (100000000) to tsc(): 4004035641 cycles or 40 cycles/call
 150      Calls (100000000) to gettimeofday(): 9723158352 cycles or 97 cycles/call
 151
 152    For merging traces with the kernel, a time source compatible with that of
 153    the kernel is necessary.
 154
 155 */
 156
 157 #if 0
 158 /* WARNING: Make sure to set frequency and scaling functions that will not
 159  * result in lttv timestamps (sec.nsec) with seconds greater than 2**32-1.
 160  */
 161 static inline u64 trace_clock_read64(void)
 162 {
 163         uint32_t low;
 164         uint32_t high;
 165         uint64_t retval;
 166         __asm__ volatile ("rdtsc\n" : "=a" (low), "=d" (high));
 167
 168         retval = high;
 169         retval <<= 32;
 170         return retval | low;
 171 }
 172 #endif
 173
 174 #include <sys/time.h>
 175
 176 static inline u64 trace_clock_read64(void)
 177 {
 178         struct timeval tv;
 179         u64 retval;
 180
 181         gettimeofday(&tv, NULL);
 182         retval = tv.tv_sec;
 183         retval *= 1000000;
 184         retval += tv.tv_usec;
 185
 186         return retval;
 187 }
 188
 189 static inline u64 trace_clock_frequency(void)
 190 {
 191         return 1000000LL;
 192 }
 193
 194 static inline u32 trace_clock_freq_scale(void)
 195 {
 196         return 1;
 197 }
 198
 199 #endif /* KERNELCOMPAT_H */