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| author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2018-09-07 15:31:31 +0200 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2018-09-10 07:09:42 +0200 |
| commit | d90c8137a88f9a456b711a741b88e5c6ef5735d8 (patch) | |
| tree | 58c744c076c1386333a397dab0206b43373346f1 | |
| parent | user: Add qoriq BSP section (diff) | |
| download | rtems-docs-d90c8137a88f9a456b711a741b88e5c6ef5735d8.tar.bz2 | |
c-user: Mention per-processor data
Close #3507.
| -rw-r--r-- | c-user/symmetric_multiprocessing_services.rst | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/c-user/symmetric_multiprocessing_services.rst b/c-user/symmetric_multiprocessing_services.rst index 638292b..b2773e7 100644 --- a/c-user/symmetric_multiprocessing_services.rst +++ b/c-user/symmetric_multiprocessing_services.rst @@ -791,3 +791,21 @@ from the executing to the heir thread neither the stack of the executing nor the heir thread must be used during interrupt processing. For this purpose a temporary per-processor stack is set up which may be used by the interrupt prologue before the stack is switched to the interrupt stack. + +Per-Processor Data +------------------ + +RTEMS provides two means for per-processor data: + +1. Per-processor data which is used by RTEMS itself is contained in the + `Per_CPU_Control` structure. The application configuration via + `<rtems/confdefs.h>` creates a table of these structures + (`_Per_CPU_Information[]`). The table is dimensioned according to the count + of configured processors + (:ref:`CONFIGURE_MAXIMUM_PROCESSORS <CONFIGURE_MAXIMUM_PROCESSORS>`). + +2. For low level support libraries an API for statically allocated + per-processor data is available via + `<rtems/score/percpudata.h> <https://git.rtems.org/rtems/tree/cpukit/include/rtems/score/percpudata.h>`_. + This API is not intended for general application use. Please ask on the + development mailing list in case you want to use it. |