src/mcas/osi_mcas_atomic.h

   1 /*
   2  * Copyright (c) 2008-2009
   3  * The Linux Box Corporation
   4  * ALL RIGHTS RESERVED
   5  *
   6  * Permission is granted to use, copy, create derivative works
   7  * and redistribute this software and such derivative works
   8  * for any purpose, so long as the name of the Linux Box
   9  * Corporation is not used in any advertising or publicity
  10  * pertaining to the use or distribution of this software
  11  * without specific, written prior authorization.  If the
  12  * above copyright notice or any other identification of the
  13  * Linux Box Corporation is included in any copy of any
  14  * portion of this software, then the disclaimer below must
  15  * also be included.
  16  *
  17  * This software is provided as is, without representation
  18  * from the Linux Box Corporation as to its fitness for any
  19  * purpose, and without warranty by the Linux Box Corporation
  20  * of any kind, either express or implied, including
  21  * without limitation the implied warranties of
  22  * merchantability and fitness for a particular purpose.  The
  23  * regents of the Linux Box Corporation shall not be liable
  24  * for any damages, including special, indirect, incidental, or
  25  * consequential damages, with respect to any claim arising
  26  * out of or in connection with the use of the software, even
  27  * if it has been or is hereafter advised of the possibility of
  28  * such damages.
  29  */
  30
  31 #ifndef OSI_MCAS_ATOMIC_H
  32 #define OSI_MCAS_ATOMIC_H
  33
  34 #include "portable_defns.h" /* FASPO, CASIO, etc. */
  35
  36 #define CASIO_ATOMICS 1
  37
  38 typedef unsigned long osi_atomic_t;
  39
  40
  41 #if CASIO_ATOMICS
  42
  43 #warning Compiling with new CASIO atomic inc/dec
  44
  45 /* these update in place, discarding the result */
  46 #define osi_atomic_inc(x) ADD_TO((x), 1UL)
  47 #define osi_atomic_dec(x) SUB_FROM((x), 1UL)
  48 #define osi_atomic_dec_n(x, n) SUB_FROM((x), (n))
  49
  50 /* these return the old value of x when the update succeeds */
  51 #define osi_atomic_add_n_r(x, n, r) ADD_TO_RETURNING_OLD((x), (n), (r))
  52 #define osi_atomic_sub_n_r(x, n, r) SUB_FROM_RETURNING_OLD((x), (n), (r))
  53 #define osi_atomic_inc_r(x, r) ADD_TO_RETURNING_OLD((x), 1UL, (r))
  54 #define osi_atomic_dec_r(x, r) SUB_FROM_RETURNING_OLD((x), 1UL, (r))
  55
  56 #else
  57
  58 #warning Compiling with FASPO and RMB() atomic inc/dec
  59
  60 #define osi_atomic_inc(x) \
  61 do { \
  62         RMB(); \
  63         FASPO(&x, x+1); \
  64 } while(0);
  65
  66 #define osi_atomic_dec(x) \
  67 do { \
  68         RMB(); \
  69         FASPO(&x, x-1); \
  70 } while(0);
  71
  72 #define osi_atomic_dec_n(x, n) \
  73 do { \
  74         RMB(); \
  75         FASPO(&x, x-n); \
  76 } while(0);
  77
  78 #endif /* old atomics */
  79
  80 #endif /* OSI_MCAS_ATOMIC_H */