share/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 /* ERROR OPS */
  26
  27 #define MAX_ERRNO       4095
  28
  29 #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
  30
  31 static inline void *ERR_PTR(long error)
  32 {
  33         return (void *) error;
  34 }
  35
  36 static inline long PTR_ERR(const void *ptr)
  37 {
  38         return (long) ptr;
  39 }
  40
  41 static inline long IS_ERR(const void *ptr)
  42 {
  43         return IS_ERR_VALUE((unsigned long)ptr);
  44 }
  45
  46
  47 /* Min / Max */
  48
  49 #define min_t(type, x, y) ({                    \
  50         type __min1 = (x);                      \
  51         type __min2 = (y);                      \
  52         __min1 < __min2 ? __min1: __min2; })
  53
  54 #define max_t(type, x, y) ({                    \
  55         type __max1 = (x);                      \
  56         type __max2 = (y);                      \
  57         __max1 > __max2 ? __max1: __max2; })
  58
  59
  60 /* MUTEXES */
  61
  62 #include <pthread.h>
  63
  64 #define DEFINE_MUTEX(m) pthread_mutex_t (m) = PTHREAD_MUTEX_INITIALIZER;
  65 #define DECLARE_MUTEX(m) extern pthread_mutex_t (m);
  66
  67 #define mutex_lock(m) pthread_mutex_lock(m)
  68
  69 #define mutex_unlock(m) pthread_mutex_unlock(m)
  70
  71
  72 /* MALLOCATION */
  73
  74 #include <stdlib.h>
  75
  76 #define kmalloc(s, t) malloc(s)
  77 #define kzalloc(s, t) zmalloc(s)
  78 #define kfree(p) free((void *)p)
  79 #define kstrdup(s, t) strdup(s)
  80
  81 #define zmalloc(s) calloc(1, s)
  82
  83 #define GFP_KERNEL
  84
  85 /* PRINTK */
  86
  87 #include <stdio.h>
  88 #define printk(fmt, args...) printf(fmt, ## args)
  89
  90
  91 /* ATTRIBUTES */
  92
  93 #define ____cacheline_aligned
  94
  95 /* MATH */
  96
  97 static inline unsigned int hweight32(unsigned int w)
  98 {
  99         unsigned int res = w - ((w >> 1) & 0x55555555);
 100         res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
 101         res = (res + (res >> 4)) & 0x0F0F0F0F;
 102         res = res + (res >> 8);
 103         return (res + (res >> 16)) & 0x000000FF;
 104 }
 105
 106 static inline int fls(int x)
 107 {
 108         int r;
 109 //ust// #ifdef CONFIG_X86_CMOV
 110         asm("bsrl %1,%0\n\t"
 111             "cmovzl %2,%0"
 112             : "=&r" (r) : "rm" (x), "rm" (-1));
 113 //ust// #else
 114 //ust//         asm("bsrl %1,%0\n\t"
 115 //ust//             "jnz 1f\n\t"
 116 //ust//             "movl $-1,%0\n"
 117 //ust//             "1:" : "=r" (r) : "rm" (x));
 118 //ust// #endif
 119         return r + 1;
 120 }
 121
 122 static __inline__ int get_count_order(unsigned int count)
 123 {
 124         int order;
 125
 126         order = fls(count) - 1;
 127         if (count & (count - 1))
 128                 order++;
 129         return order;
 130 }
 131
 132
 133
 134
 135 #include <unistd.h>
 136
 137 #define ALIGN(x,a)              __ALIGN_MASK(x,(typeof(x))(a)-1)
 138 #define __ALIGN_MASK(x,mask)    (((x)+(mask))&~(mask))
 139 #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
 140 #define PAGE_SIZE sysconf(_SC_PAGE_SIZE)
 141 #define PAGE_MASK (~(PAGE_SIZE-1))
 142
 143
 144
 145
 146 /* ARRAYS */
 147
 148 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
 149
 150 /* TRACE CLOCK */
 151
 152 /* There are two types of clocks that can be used.
 153    - TSC based clock
 154    - gettimeofday() clock
 155
 156    Microbenchmarks on Linux 2.6.30 on Core2 Duo 3GHz (functions are inlined):
 157      Calls (100000000) to tsc(): 4004035641 cycles or 40 cycles/call
 158      Calls (100000000) to gettimeofday(): 9723158352 cycles or 97 cycles/call
 159
 160    For merging traces with the kernel, a time source compatible with that of
 161    the kernel is necessary.
 162
 163 */
 164
 165 #if 0
 166 /* WARNING: Make sure to set frequency and scaling functions that will not
 167  * result in lttv timestamps (sec.nsec) with seconds greater than 2**32-1.
 168  */
 169 static inline u64 trace_clock_read64(void)
 170 {
 171         uint32_t low;
 172         uint32_t high;
 173         uint64_t retval;
 174         __asm__ volatile ("rdtsc\n" : "=a" (low), "=d" (high));
 175
 176         retval = high;
 177         retval <<= 32;
 178         return retval | low;
 179 }
 180 #endif
 181
 182 static inline u64 trace_clock_read64(void)
 183 {
 184         struct timeval tv;
 185         u64 retval;
 186
 187         gettimeofday(&tv, NULL);
 188         retval = tv.tv_sec;
 189         retval *= 1000000;
 190         retval += tv.tv_usec;
 191
 192         return retval;
 193 }
 194
 195 static inline u64 trace_clock_frequency(void)
 196 {
 197         return 1000000LL;
 198 }
 199
 200 static inline u32 trace_clock_freq_scale(void)
 201 {
 202         return 1;
 203 }
 204
 205
 206 #endif /* KERNELCOMPAT_H */