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c-user: Mention per-processor data

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Close #3507.
This commit is contained in:
Sebastian Huber 2018-09-07 15:31:31 +02:00
parent c476ccef39
commit d90c8137a8
1 changed files with 18 additions and 0 deletions
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c-user/symmetric_multiprocessing_services.rst
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@ -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.