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