diff options
Diffstat (limited to 'cpukit/score/cpu/or1k/rtems/score/cpu.h')
| -rw-r--r-- | cpukit/score/cpu/or1k/rtems/score/cpu.h | 24 |
1 files changed, 3 insertions, 21 deletions
diff --git a/cpukit/score/cpu/or1k/rtems/score/cpu.h b/cpukit/score/cpu/or1k/rtems/score/cpu.h index c9b833ca3d..2405844d92 100644 --- a/cpukit/score/cpu/or1k/rtems/score/cpu.h +++ b/cpukit/score/cpu/or1k/rtems/score/cpu.h @@ -252,28 +252,10 @@ extern "C" { #define CPU_STACK_GROWS_UP FALSE -/* - * The following is the variable attribute used to force alignment - * of critical RTEMS structures. On some processors it may make - * sense to have these aligned on tighter boundaries than - * the minimum requirements of the compiler in order to have as - * much of the critical data area as possible in a cache line. - * - * The placement of this macro in the declaration of the variables - * is based on the syntactically requirements of the GNU C - * "__attribute__" extension. For example with GNU C, use - * the following to force a structures to a 32 byte boundary. - * - * __attribute__ ((aligned (32))) - * - * NOTE: Currently only the Priority Bit Map table uses this feature. - * To benefit from using this, the data must be heavily - * used so it will stay in the cache and used frequently enough - * in the executive to justify turning this on. - * - */ +/* FIXME: Is this the right value? */ +#define CPU_CACHE_LINE_BYTES 32 -#define CPU_STRUCTURE_ALIGNMENT __attribute__ ((aligned (32))) +#define CPU_STRUCTURE_ALIGNMENT RTEMS_ALIGNED( CPU_CACHE_LINE_BYTES ) /* * Define what is required to specify how the network to host conversion |