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  41 /*
  42  * atomic.h - SPU atomic SHM counter operations.
  43  *
  44  * Interfaces patterned after, and hopefully compatible
  45  * with PowerPC64-Linux atomic counter operations.  Uses
  46  * 32b values for various counters.
  47  */
  48 #ifndef _SPU_ATOMIC_H_
  49 #define _SPU_ATOMIC_H_
  50
  51 #include <sync_utils.h>
  52 #include <spu_mfcio.h>
  53
  54
  55 /* atomic_eaddr_t is a 64bit effective address
  56  * that points to an atomic_t variable */
  57 typedef unsigned long long atomic_ea_t;
  58
  59 #define DECL_ATOMIC_VARS()                              \
  60     char _tmp[256];                                     \
  61     char *tmp = (char *) ALIGN(_tmp, 128);              \
  62     volatile s32 *buf = (volatile s32 *) &tmp[0];       \
  63     u32 size = 128, tagid = 0;                          \
  64     s32 ret_val;                                        \
  65     u32 offset;                                         \
  66     addr64 ea64
  67
  68 /* __atomic_op
  69 *    Internal routine to acquire lock line reservation
  70 *    then conditionally modify the counter variable
  71 *    pointed to by 'v'.  The 'replace' flag indicates
  72 *    whether or not this is to be an arithmetic R-M-W
  73 *    or a simple replace operation.
  74 */
  75 #define ATOMIC_OP(__v, __val, __replace, __final_val)           \
  76 {                                                               \
  77     char __tmp[256];                                            \
  78     char *_tmp = (char *) ALIGN(__tmp, 128);                    \
  79     volatile s32 *_buf = (volatile s32 *) &_tmp[0];             \
  80     u32 _size = 128, _tagid = 0;                                \
  81     s32 _status, _ret_val;                                      \
  82     u32 _offset;                                                \
  83     addr64 _ea64;                                               \
  84                                                                 \
  85     _ea64.ull = ALIGN128_EA(__v);                               \
  86     _offset = OFFSET128_EA_U32(__v);                            \
  87     do {                                                        \
  88         MFC_DMA(_buf, _ea64, _size, _tagid, MFC_GETLLAR_CMD);   \
  89         spu_readch (MFC_RdAtomicStat);                          \
  90                                                                 \
  91         _ret_val = _buf[_offset];                                \
  92         _buf[_offset] = (__replace) ? __val : _ret_val + __val;    \
  93         MFC_DMA(_buf, _ea64, _size, _tagid, MFC_PUTLLC_CMD);    \
  94         _status = spu_readch(MFC_RdAtomicStat);                  \
  95     } while (_status != 0);                                     \
  96                                                                 \
  97     __final_val = _ret_val;                                     \
  98 }
  99
 100 #endif /* _SPU_ATOMIC_H_ */
 101