include/ust/kernelcompat.h

   1 #ifndef KERNELCOMPAT_H
   2 #define KERNELCOMPAT_H
   3
   4 #include <kcompat.h>
   5
   6 #include <string.h>
   7 #include <sys/time.h>
   8
   9 /* FIXME: libkcompat must not define arch-specific local ops, as ust *must*
  10  * fallback to the normal atomic ops. Fix things so we don't add them and
  11  * break things accidentally.
  12  */
  13
  14 #define container_of(ptr, type, member) ({                      \
  15         const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
  16         (type *)( (char *)__mptr - offsetof(type,member) );})
  17
  18 #define KERN_DEBUG ""
  19 #define KERN_NOTICE ""
  20 #define KERN_INFO ""
  21 #define KERN_ERR ""
  22 #define KERN_ALERT ""
  23 #define KERN_WARNING ""
  24
  25 #define WARN_ON_ONCE(msg) WARN_ON(msg)
  26
  27 /* ERROR OPS */
  28
  29 #define MAX_ERRNO       4095
  30
  31 #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
  32
  33 static inline void *ERR_PTR(long error)
  34 {
  35         return (void *) error;
  36 }
  37
  38 static inline long PTR_ERR(const void *ptr)
  39 {
  40         return (long) ptr;
  41 }
  42
  43 static inline long IS_ERR(const void *ptr)
  44 {
  45         return IS_ERR_VALUE((unsigned long)ptr);
  46 }
  47
  48
  49 /* Min / Max */
  50
  51 #define min_t(type, x, y) ({                    \
  52         type __min1 = (x);                      \
  53         type __min2 = (y);                      \
  54         __min1 < __min2 ? __min1: __min2; })
  55
  56 #define max_t(type, x, y) ({                    \
  57         type __max1 = (x);                      \
  58         type __max2 = (y);                      \
  59         __max1 > __max2 ? __max1: __max2; })
  60
  61
  62 /* MUTEXES */
  63
  64 #include <pthread.h>
  65
  66 #define DEFINE_MUTEX(m) pthread_mutex_t (m) = PTHREAD_MUTEX_INITIALIZER;
  67 #define DECLARE_MUTEX(m) extern pthread_mutex_t (m);
  68
  69 #define mutex_lock(m) pthread_mutex_lock(m)
  70
  71 #define mutex_unlock(m) pthread_mutex_unlock(m)
  72
  73
  74 /* MALLOCATION */
  75
  76 #define zmalloc(s) calloc(1, s)
  77
  78 /* ATTRIBUTES */
  79
  80 #define ____cacheline_aligned
  81
  82 /* MATH */
  83
  84 static inline unsigned int hweight32(unsigned int w)
  85 {
  86         unsigned int res = w - ((w >> 1) & 0x55555555);
  87         res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
  88         res = (res + (res >> 4)) & 0x0F0F0F0F;
  89         res = res + (res >> 8);
  90         return (res + (res >> 16)) & 0x000000FF;
  91 }
  92
  93 static inline int fls(int x)
  94 {
  95         int r;
  96 //ust// #ifdef CONFIG_X86_CMOV
  97         asm("bsrl %1,%0\n\t"
  98             "cmovzl %2,%0"
  99             : "=&r" (r) : "rm" (x), "rm" (-1));
 100 //ust// #else
 101 //ust//         asm("bsrl %1,%0\n\t"
 102 //ust//             "jnz 1f\n\t"
 103 //ust//             "movl $-1,%0\n"
 104 //ust//             "1:" : "=r" (r) : "rm" (x));
 105 //ust// #endif
 106         return r + 1;
 107 }
 108
 109 static __inline__ int get_count_order(unsigned int count)
 110 {
 111         int order;
 112
 113         order = fls(count) - 1;
 114         if (count & (count - 1))
 115                 order++;
 116         return order;
 117 }
 118
 119
 120
 121
 122 #include <unistd.h>
 123
 124 #define ALIGN(x,a)              __ALIGN_MASK(x,(typeof(x))(a)-1)
 125 #define __ALIGN_MASK(x,mask)    (((x)+(mask))&~(mask))
 126 #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
 127 #define PAGE_SIZE sysconf(_SC_PAGE_SIZE)
 128 #define PAGE_MASK (~(PAGE_SIZE-1))
 129
 130
 131
 132
 133 /* ARRAYS */
 134
 135 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
 136
 137 /* TRACE CLOCK */
 138
 139 /* There are two types of clocks that can be used.
 140    - TSC based clock
 141    - gettimeofday() clock
 142
 143    Microbenchmarks on Linux 2.6.30 on Core2 Duo 3GHz (functions are inlined):
 144      Calls (100000000) to tsc(): 4004035641 cycles or 40 cycles/call
 145      Calls (100000000) to gettimeofday(): 9723158352 cycles or 97 cycles/call
 146
 147    For merging traces with the kernel, a time source compatible with that of
 148    the kernel is necessary.
 149
 150 */
 151
 152 #if 0
 153 /* WARNING: Make sure to set frequency and scaling functions that will not
 154  * result in lttv timestamps (sec.nsec) with seconds greater than 2**32-1.
 155  */
 156 static inline u64 trace_clock_read64(void)
 157 {
 158         uint32_t low;
 159         uint32_t high;
 160         uint64_t retval;
 161         __asm__ volatile ("rdtsc\n" : "=a" (low), "=d" (high));
 162
 163         retval = high;
 164         retval <<= 32;
 165         return retval | low;
 166 }
 167 #endif
 168
 169 static inline u64 trace_clock_read64(void)
 170 {
 171         struct timeval tv;
 172         u64 retval;
 173
 174         gettimeofday(&tv, NULL);
 175         retval = tv.tv_sec;
 176         retval *= 1000000;
 177         retval += tv.tv_usec;
 178
 179         return retval;
 180 }
 181
 182 static inline u64 trace_clock_frequency(void)
 183 {
 184         return 1000000LL;
 185 }
 186
 187 static inline u32 trace_clock_freq_scale(void)
 188 {
 189         return 1;
 190 }
 191
 192
 193 /* PERCPU */
 194
 195 #define __get_cpu_var(x) x
 196
 197 #endif /* KERNELCOMPAT_H */