atomic.h

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/*
 * atomic.h - SPU atomic SHM counter operations.
 *
 * Interfaces patterned after, and hopefully compatible
 * with PowerPC64-Linux atomic counter operations.  Uses
 * 32b values for various counters.
 */
#ifndef _SPU_ATOMIC_H_
#define _SPU_ATOMIC_H_

#include <sync_utils.h>
#include <spu_mfcio.h>


/* atomic_eaddr_t is a 64bit effective address 
 * that points to an atomic_t variable */
typedef unsigned long long atomic_ea_t;

#define DECL_ATOMIC_VARS()                              \
    char _tmp[256];                                     \
    char *tmp = (char *) ALIGN(_tmp, 128);              \
    volatile s32 *buf = (volatile s32 *) &tmp[0];       \
    u32 size = 128, tagid = 0;                          \
    s32 ret_val;                                        \
    u32 offset;                                         \
    addr64 ea64

/* __atomic_op                                              
*    Internal routine to acquire lock line reservation
*    then conditionally modify the counter variable 
*    pointed to by 'v'.  The 'replace' flag indicates 
*    whether or not this is to be an arithmetic R-M-W
*    or a simple replace operation.
*/
#define ATOMIC_OP(__v, __val, __replace, __final_val)           \
{                                                               \
    char __tmp[256];                                            \
    char *_tmp = (char *) ALIGN(__tmp, 128);                    \
    volatile s32 *_buf = (volatile s32 *) &_tmp[0];             \
    u32 _size = 128, _tagid = 0;                                \
    s32 _status, _ret_val;                                      \
    u32 _offset;                                                \
    addr64 _ea64;                                               \
                                                                \
    _ea64.ull = ALIGN128_EA(__v);                               \
    _offset = OFFSET128_EA_U32(__v);                            \
    do {                                                        \
        MFC_DMA(_buf, _ea64, _size, _tagid, MFC_GETLLAR_CMD);   \
        spu_readch (MFC_RdAtomicStat);                          \
                                                                \
        _ret_val = _buf[_offset];                                \
        _buf[_offset] = (__replace) ? __val : _ret_val + __val;    \
        MFC_DMA(_buf, _ea64, _size, _tagid, MFC_PUTLLC_CMD);    \
        _status = spu_readch(MFC_RdAtomicStat);                  \
    } while (_status != 0);                                     \
                                                                \
    __final_val = _ret_val;                                     \
}                                                               

#endif /* _SPU_ATOMIC_H_ */