include/asm-ia64/intrinsics.h

   1 #ifndef _ASM_IA64_INTRINSICS_H
   2 #define _ASM_IA64_INTRINSICS_H
   3
   4 /*
   5  * Compiler-dependent intrinsics.
   6  *
   7  * Copyright (C) 2002-2003 Hewlett-Packard Co
   8  *      David Mosberger-Tang <davidm@hpl.hp.com>
   9  */
  10
  11 #ifndef __ASSEMBLY__
  12
  13 /* include compiler specific intrinsics */
  14 #include <asm/ia64regs.h>
  15 #ifdef __INTEL_COMPILER
  16 # include <asm/intel_intrin.h>
  17 #else
  18 # include <asm/gcc_intrin.h>
  19 #endif
  20
  21 /*
  22  * Force an unresolved reference if someone tries to use
  23  * ia64_fetch_and_add() with a bad value.
  24  */
  25 extern unsigned long __bad_size_for_ia64_fetch_and_add (void);
  26 extern unsigned long __bad_increment_for_ia64_fetch_and_add (void);
  27
  28 #define IA64_FETCHADD(tmp,v,n,sz,sem)                                           \
  29 ({                                                                              \
  30         switch (sz) {                                                           \
  31               case 4:                                                           \
  32                 tmp = ia64_fetchadd4_##sem((unsigned int *) v, n);              \
  33                 break;                                                          \
  34                                                                                 \
  35               case 8:                                                           \
  36                 tmp = ia64_fetchadd8_##sem((unsigned long *) v, n);             \
  37                 break;                                                          \
  38                                                                                 \
  39               default:                                                          \
  40                 __bad_size_for_ia64_fetch_and_add();                            \
  41         }                                                                       \
  42 })
  43
  44 #define ia64_fetchadd(i,v,sem)                                                          \
  45 ({                                                                                      \
  46         __u64 _tmp;                                                                     \
  47         volatile __typeof__(*(v)) *_v = (v);                                            \
  48         /* Can't use a switch () here: gcc isn't always smart enough for that... */     \
  49         if ((i) == -16)                                                                 \
  50                 IA64_FETCHADD(_tmp, _v, -16, sizeof(*(v)), sem);                        \
  51         else if ((i) == -8)                                                             \
  52                 IA64_FETCHADD(_tmp, _v, -8, sizeof(*(v)), sem);                         \
  53         else if ((i) == -4)                                                             \
  54                 IA64_FETCHADD(_tmp, _v, -4, sizeof(*(v)), sem);                         \
  55         else if ((i) == -1)                                                             \
  56                 IA64_FETCHADD(_tmp, _v, -1, sizeof(*(v)), sem);                         \
  57         else if ((i) == 1)                                                              \
  58                 IA64_FETCHADD(_tmp, _v, 1, sizeof(*(v)), sem);                          \
  59         else if ((i) == 4)                                                              \
  60                 IA64_FETCHADD(_tmp, _v, 4, sizeof(*(v)), sem);                          \
  61         else if ((i) == 8)                                                              \
  62                 IA64_FETCHADD(_tmp, _v, 8, sizeof(*(v)), sem);                          \
  63         else if ((i) == 16)                                                             \
  64                 IA64_FETCHADD(_tmp, _v, 16, sizeof(*(v)), sem);                         \
  65         else                                                                            \
  66                 _tmp = __bad_increment_for_ia64_fetch_and_add();                        \
  67         (__typeof__(*(v))) (_tmp);      /* return old value */                          \
  68 })
  69
  70 #define ia64_fetch_and_add(i,v) (ia64_fetchadd(i, v, rel) + (i)) /* return new value */
  71
  72 /*
  73  * This function doesn't exist, so you'll get a linker error if
  74  * something tries to do an invalid xchg().
  75  */
  76 extern void ia64_xchg_called_with_bad_pointer (void);
  77
  78 #define __xchg(x,ptr,size)                                              \
  79 ({                                                                      \
  80         unsigned long __xchg_result;                                    \
  81                                                                         \
  82         switch (size) {                                                 \
  83               case 1:                                                   \
  84                 __xchg_result = ia64_xchg1((__u8 *)ptr, x);             \
  85                 break;                                                  \
  86                                                                         \
  87               case 2:                                                   \
  88                 __xchg_result = ia64_xchg2((__u16 *)ptr, x);            \
  89                 break;                                                  \
  90                                                                         \
  91               case 4:                                                   \
  92                 __xchg_result = ia64_xchg4((__u32 *)ptr, x);            \
  93                 break;                                                  \
  94                                                                         \
  95               case 8:                                                   \
  96                 __xchg_result = ia64_xchg8((__u64 *)ptr, x);            \
  97                 break;                                                  \
  98               default:                                                  \
  99                 ia64_xchg_called_with_bad_pointer();                    \
 100         }                                                               \
 101         __xchg_result;                                                  \
 102 })
 103
 104 #define xchg(ptr,x)                                                          \
 105   ((__typeof__(*(ptr))) __xchg ((unsigned long) (x), (ptr), sizeof(*(ptr))))
 106
 107 /*
 108  * Atomic compare and exchange.  Compare OLD with MEM, if identical,
 109  * store NEW in MEM.  Return the initial value in MEM.  Success is
 110  * indicated by comparing RETURN with OLD.
 111  */
 112
 113 #define __HAVE_ARCH_CMPXCHG 1
 114
 115 /*
 116  * This function doesn't exist, so you'll get a linker error
 117  * if something tries to do an invalid cmpxchg().
 118  */
 119 extern long ia64_cmpxchg_called_with_bad_pointer (void);
 120
 121 #define ia64_cmpxchg(sem,ptr,old,new,size)                                              \
 122 ({                                                                                      \
 123         __u64 _o_, _r_;                                                                 \
 124                                                                                         \
 125         switch (size) {                                                                 \
 126               case 1: _o_ = (__u8 ) (long) (old); break;                                \
 127               case 2: _o_ = (__u16) (long) (old); break;                                \
 128               case 4: _o_ = (__u32) (long) (old); break;                                \
 129               case 8: _o_ = (__u64) (long) (old); break;                                \
 130               default: break;                                                           \
 131         }                                                                               \
 132         switch (size) {                                                                 \
 133               case 1:                                                                   \
 134                 _r_ = ia64_cmpxchg1_##sem((__u8 *) ptr, new, _o_);                      \
 135                 break;                                                                  \
 136                                                                                         \
 137               case 2:                                                                   \
 138                _r_ = ia64_cmpxchg2_##sem((__u16 *) ptr, new, _o_);                      \
 139                 break;                                                                  \
 140                                                                                         \
 141               case 4:                                                                   \
 142                 _r_ = ia64_cmpxchg4_##sem((__u32 *) ptr, new, _o_);                     \
 143                 break;                                                                  \
 144                                                                                         \
 145               case 8:                                                                   \
 146                 _r_ = ia64_cmpxchg8_##sem((__u64 *) ptr, new, _o_);                     \
 147                 break;                                                                  \
 148                                                                                         \
 149               default:                                                                  \
 150                 _r_ = ia64_cmpxchg_called_with_bad_pointer();                           \
 151                 break;                                                                  \
 152         }                                                                               \
 153         (__typeof__(old)) _r_;                                                          \
 154 })
 155
 156 #define cmpxchg_acq(ptr,o,n)    ia64_cmpxchg(acq, (ptr), (o), (n), sizeof(*(ptr)))
 157 #define cmpxchg_rel(ptr,o,n)    ia64_cmpxchg(rel, (ptr), (o), (n), sizeof(*(ptr)))
 158
 159 /* for compatibility with other platforms: */
 160 #define cmpxchg(ptr,o,n)        cmpxchg_acq(ptr,o,n)
 161
 162 #ifdef CONFIG_IA64_DEBUG_CMPXCHG
 163 # define CMPXCHG_BUGCHECK_DECL  int _cmpxchg_bugcheck_count = 128;
 164 # define CMPXCHG_BUGCHECK(v)                                                    \
 165   do {                                                                          \
 166         if (_cmpxchg_bugcheck_count-- <= 0) {                                   \
 167                 void *ip;                                                       \
 168                 extern int printk(const char *fmt, ...);                        \
 169                 ip = (void *) ia64_getreg(_IA64_REG_IP);                        \
 170                 printk("CMPXCHG_BUGCHECK: stuck at %p on word %p\n", ip, (v));  \
 171                 break;                                                          \
 172         }                                                                       \
 173   } while (0)
 174 #else /* !CONFIG_IA64_DEBUG_CMPXCHG */
 175 # define CMPXCHG_BUGCHECK_DECL
 176 # define CMPXCHG_BUGCHECK(v)
 177 #endif /* !CONFIG_IA64_DEBUG_CMPXCHG */
 178
 179 #endif
 180 #endif /* _ASM_IA64_INTRINSICS_H */