include/ust/kernelcompat.h

   1 #ifndef KERNELCOMPAT_H
   2 #define KERNELCOMPAT_H
   3
   4 #include <kcompat.h>
   5
   6 /* FIXME: libkcompat must not define arch-specific local ops, as ust *must*
   7  * fallback to the normal atomic ops. Fix things so we don't add them and
   8  * break things accidentally.
   9  */
  10
  11 #define container_of(ptr, type, member) ({                      \
  12         const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
  13         (type *)( (char *)__mptr - offsetof(type,member) );})
  14
  15 /* ERROR OPS */
  16 #define MAX_ERRNO       4095
  17
  18 #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
  19
  20 static inline void *ERR_PTR(long error)
  21 {
  22         return (void *) error;
  23 }
  24
  25 static inline long PTR_ERR(const void *ptr)
  26 {
  27         return (long) ptr;
  28 }
  29
  30 static inline long IS_ERR(const void *ptr)
  31 {
  32         return IS_ERR_VALUE((unsigned long)ptr);
  33 }
  34
  35
  36 /* Min / Max */
  37
  38 #define min_t(type, x, y) ({                    \
  39         type __min1 = (x);                      \
  40         type __min2 = (y);                      \
  41         __min1 < __min2 ? __min1: __min2; })
  42
  43 #define max_t(type, x, y) ({                    \
  44         type __max1 = (x);                      \
  45         type __max2 = (y);                      \
  46         __max1 > __max2 ? __max1: __max2; })
  47
  48
  49 /* MUTEXES */
  50
  51 #include <pthread.h>
  52
  53 #define DEFINE_MUTEX(m) pthread_mutex_t (m) = PTHREAD_MUTEX_INITIALIZER;
  54 #define DECLARE_MUTEX(m) extern pthread_mutex_t (m);
  55
  56 #define mutex_lock(m) pthread_mutex_lock(m)
  57
  58 #define mutex_unlock(m) pthread_mutex_unlock(m)
  59
  60
  61 /* MALLOCATION */
  62
  63 #define zmalloc(s) calloc(1, s)
  64
  65 /* ATTRIBUTES */
  66
  67 /* FIXME: define this */
  68 #define ____cacheline_aligned
  69
  70 /* MATH */
  71
  72 static inline unsigned int hweight32(unsigned int w)
  73 {
  74         unsigned int res = w - ((w >> 1) & 0x55555555);
  75         res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
  76         res = (res + (res >> 4)) & 0x0F0F0F0F;
  77         res = res + (res >> 8);
  78         return (res + (res >> 16)) & 0x000000FF;
  79 }
  80
  81 static inline int fls(int x)
  82 {
  83         int r;
  84 //ust// #ifdef CONFIG_X86_CMOV
  85         asm("bsrl %1,%0\n\t"
  86             "cmovzl %2,%0"
  87             : "=&r" (r) : "rm" (x), "rm" (-1));
  88 //ust// #else
  89 //ust//         asm("bsrl %1,%0\n\t"
  90 //ust//             "jnz 1f\n\t"
  91 //ust//             "movl $-1,%0\n"
  92 //ust//             "1:" : "=r" (r) : "rm" (x));
  93 //ust// #endif
  94         return r + 1;
  95 }
  96
  97 static __inline__ int get_count_order(unsigned int count)
  98 {
  99         int order;
 100
 101         order = fls(count) - 1;
 102         if (count & (count - 1))
 103                 order++;
 104         return order;
 105 }
 106
 107
 108
 109
 110 #include <unistd.h>
 111
 112 #define ALIGN(x,a)              __ALIGN_MASK(x,(typeof(x))(a)-1)
 113 #define __ALIGN_MASK(x,mask)    (((x)+(mask))&~(mask))
 114 #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
 115 #define PAGE_SIZE sysconf(_SC_PAGE_SIZE)
 116 #define PAGE_MASK (~(PAGE_SIZE-1))
 117
 118
 119
 120
 121 /* ARRAYS */
 122
 123 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
 124
 125 /* TRACE CLOCK */
 126
 127 /* There are two types of clocks that can be used.
 128    - TSC based clock
 129    - gettimeofday() clock
 130
 131    Microbenchmarks on Linux 2.6.30 on Core2 Duo 3GHz (functions are inlined):
 132      Calls (100000000) to tsc(): 4004035641 cycles or 40 cycles/call
 133      Calls (100000000) to gettimeofday(): 9723158352 cycles or 97 cycles/call
 134
 135    For merging traces with the kernel, a time source compatible with that of
 136    the kernel is necessary.
 137
 138 */
 139
 140 #if 0
 141 /* WARNING: Make sure to set frequency and scaling functions that will not
 142  * result in lttv timestamps (sec.nsec) with seconds greater than 2**32-1.
 143  */
 144 static inline u64 trace_clock_read64(void)
 145 {
 146         uint32_t low;
 147         uint32_t high;
 148         uint64_t retval;
 149         __asm__ volatile ("rdtsc\n" : "=a" (low), "=d" (high));
 150
 151         retval = high;
 152         retval <<= 32;
 153         return retval | low;
 154 }
 155 #endif
 156
 157 #include <sys/time.h>
 158
 159 static inline u64 trace_clock_read64(void)
 160 {
 161         struct timeval tv;
 162         u64 retval;
 163
 164         gettimeofday(&tv, NULL);
 165         retval = tv.tv_sec;
 166         retval *= 1000000;
 167         retval += tv.tv_usec;
 168
 169         return retval;
 170 }
 171
 172 static inline u64 trace_clock_frequency(void)
 173 {
 174         return 1000000LL;
 175 }
 176
 177 static inline u32 trace_clock_freq_scale(void)
 178 {
 179         return 1;
 180 }
 181
 182 #endif /* KERNELCOMPAT_H */