lunaix-os/includes/lunaix/spike.h

   1 #ifndef __LUNAIX_SPIKE_H
   2 #define __LUNAIX_SPIKE_H
   3
   4 /** Some helper functions. As helpful as Spike the Dragon! :) **/
   5
   6 // 除法 v/(2^k) 向上取整
   7 #define CEIL(v, k) (((v) + (1 << (k)) - 1) >> (k))
   8
   9 #define ICEIL(x, y) ((x) / (y) + ((x) % (y) != 0))
  10
  11 // 除法 v/(2^k) 向下取整
  12 #define FLOOR(v, k) ((v) >> (k))
  13
  14 // 获取v最近的最大k倍数 (k=2^n)
  15 #define ROUNDUP(v, k) (((v) + (k)-1) & ~((k)-1))
  16
  17 // 获取v最近的最小k倍数 (k=2^m)
  18 #define ROUNDDOWN(v, k) ((v) & ~((k)-1))
  19
  20 #define MIN(a, b) ((a) < (b) ? (a) : (b))
  21 #define MAX(a, b) ((a) > (b) ? (a) : (b))
  22
  23 #define likely(x) __builtin_expect((x), 1)
  24
  25 /**
  26  * @brief Fast log base 2 for integer, utilizing constant unfolding.
  27  * Adopted from
  28  * https://elixir.bootlin.com/linux/v4.4/source/include/linux/log2.h#L85
  29  *
  30  */
  31 #define ILOG2(x)                                                               \
  32     (__builtin_constant_p(x) ? ((x) == 0              ? 0                      \
  33                                 : ((x) & (1ul << 31)) ? 31                     \
  34                                 : ((x) & (1ul << 30)) ? 30                     \
  35                                 : ((x) & (1ul << 29)) ? 29                     \
  36                                 : ((x) & (1ul << 28)) ? 28                     \
  37                                 : ((x) & (1ul << 27)) ? 27                     \
  38                                 : ((x) & (1ul << 26)) ? 26                     \
  39                                 : ((x) & (1ul << 25)) ? 25                     \
  40                                 : ((x) & (1ul << 24)) ? 24                     \
  41                                 : ((x) & (1ul << 23)) ? 23                     \
  42                                 : ((x) & (1ul << 22)) ? 22                     \
  43                                 : ((x) & (1ul << 21)) ? 21                     \
  44                                 : ((x) & (1ul << 20)) ? 20                     \
  45                                 : ((x) & (1ul << 19)) ? 19                     \
  46                                 : ((x) & (1ul << 18)) ? 18                     \
  47                                 : ((x) & (1ul << 17)) ? 17                     \
  48                                 : ((x) & (1ul << 16)) ? 16                     \
  49                                 : ((x) & (1ul << 15)) ? 15                     \
  50                                 : ((x) & (1ul << 14)) ? 14                     \
  51                                 : ((x) & (1ul << 13)) ? 13                     \
  52                                 : ((x) & (1ul << 12)) ? 12                     \
  53                                 : ((x) & (1ul << 11)) ? 11                     \
  54                                 : ((x) & (1ul << 10)) ? 10                     \
  55                                 : ((x) & (1ul << 9))  ? 9                      \
  56                                 : ((x) & (1ul << 8))  ? 8                      \
  57                                 : ((x) & (1ul << 7))  ? 7                      \
  58                                 : ((x) & (1ul << 6))  ? 6                      \
  59                                 : ((x) & (1ul << 5))  ? 5                      \
  60                                 : ((x) & (1ul << 4))  ? 4                      \
  61                                 : ((x) & (1ul << 3))  ? 3                      \
  62                                 : ((x) & (1ul << 2))  ? 2                      \
  63                                 : ((x) & (1ul << 1))  ? 1                      \
  64                                                       : 0)                      \
  65                              : (31 - __builtin_clz(x)))
  66
  67 #define __USER__ __attribute__((section(".usrtext")))
  68
  69 #define DO_SPIN                                                                \
  70     while (1)                                                                  \
  71         ;
  72
  73 inline static void
  74 spin()
  75 {
  76     DO_SPIN
  77 }
  78
  79 #ifndef __LUNAIXOS_NASSERT__
  80 #define assert(cond)                                                           \
  81     if (!(cond)) {                                                             \
  82         __assert_fail(#cond, __FILE__, __LINE__);                              \
  83     }
  84
  85 #define assert_msg(cond, msg)                                                  \
  86     if (!(cond)) {                                                             \
  87         __assert_fail(msg, __FILE__, __LINE__);                                \
  88     }
  89
  90 #define fail(msg) __assert_fail(msg, __FILE__, __LINE__);
  91
  92 void
  93 __assert_fail(const char* expr, const char* file, unsigned int line)
  94   __attribute__((noinline, noreturn));
  95 #else
  96 #define assert(cond) (void)(cond);          // assert nothing
  97 #define assert_msg(cond, msg) (void)(cond); // assert nothing
  98
  99 #endif                                      // __LUNAIXOS_NASSERT__
 100
 101 void
 102 panick(const char* msg);
 103
 104 void
 105 panickf(const char* fmt, ...);
 106
 107 #define wait_until(cond)                                                       \
 108     while (!(cond))                                                            \
 109         ;
 110 #define loop_until(cond)                                                       \
 111     while (!(cond))                                                            \
 112         ;
 113
 114 #define wait_until_expire(cond, max)                                           \
 115     ({                                                                         \
 116         unsigned int __wcounter__ = (max);                                     \
 117         while (!(cond) && __wcounter__-- > 1)                                  \
 118             ;                                                                  \
 119         __wcounter__;                                                          \
 120     })
 121
 122 #endif /* __LUNAIX_SPIKE_H */