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author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2016-01-25 10:20:28 +0100 |
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committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2016-01-26 09:07:30 +0100 |
commit | a8865f8b415788c4e9bb7f68e38d41aec0e485db (patch) | |
tree | d7b70c608239be68c6476b0d9e9893e099ec8be6 /cpukit/score/cpu/moxie/rtems/score/cpu.h | |
parent | score: Add RTEMS_ALIGNED() (diff) | |
download | rtems-a8865f8b415788c4e9bb7f68e38d41aec0e485db.tar.bz2 |
score: Introduce CPU_CACHE_LINE_BYTES
Add CPU_CACHE_LINE_BYTES for the maximum cache line size in bytes. The
actual processor may use no cache or a smaller cache line size.
Diffstat (limited to '')
-rw-r--r-- | cpukit/score/cpu/moxie/rtems/score/cpu.h | 26 |
1 files changed, 3 insertions, 23 deletions
diff --git a/cpukit/score/cpu/moxie/rtems/score/cpu.h b/cpukit/score/cpu/moxie/rtems/score/cpu.h index 8348d48763..4e4bbad07a 100644 --- a/cpukit/score/cpu/moxie/rtems/score/cpu.h +++ b/cpukit/score/cpu/moxie/rtems/score/cpu.h @@ -260,29 +260,9 @@ 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. - * - * MOXIE Specific Information: - * - * XXX - */ +/* FIXME: Is this the right value? */ +#define CPU_CACHE_LINE_BYTES 32 + #define CPU_STRUCTURE_ALIGNMENT /* |