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40 /* PROLOG END TAG zYx */
41 #ifndef _SPU_READ_UNLOCK_H_
42 #define _SPU_READ_UNLOCK_H_
44 #include "sync_utils.h"
46 #include <spu_mfcio.h>
50 * read_unlock - release reader lock.
51 * @ea: handle to effective address of lock variable.
53 * Description: Release a reader lock. The only restriction
54 * here is that @ea must be word aligned.
56 * Context: This routine should be used when interrupts
57 * do not need to be re-enabled --either because interrupts
58 * are not being used, or because the application will take
59 * steps to re-enable them later.
61 static __inline void _read_unlock(eaddr_t ea)
68 * Reader locks must use PUTLLC when releasing, instead of
69 * the more traditional PUTLLUC because of the non-exclusive
70 * nature of the lock. The reason for this is that other
71 * readers may have incremented the counter, and we don't
72 * want to corrupt it by blindly issuing PUTLLUC!!
74 ea64.ull = ALIGN128_EA(ea);
75 offset = OFFSET128_EA_U32(ea);
77 MFC_DMA(buf, ea64, size, tagid, MFC_GETLLAR_CMD);
78 spu_readch(MFC_RdAtomicStat);
81 MFC_DMA(buf, ea64, size, tagid, MFC_PUTLLC_CMD);
82 status = spu_readch(MFC_RdAtomicStat);
83 } while (status != 0);
88 #endif /* _SPU_READ_UNLOCK_H_ */