rtems/rtems-docs
1
0
Fork 0
mirror of https://git.rtems.org/rtems-docs/ synced 2025-07-24 01:43:06 +08:00
Code Issues Packages Projects Releases Wiki Activity

cpu-supplement: Update interrupt stack paragraph

Browse Source 
Close #3459.
This commit is contained in:
Sebastian Huber 2018-07-18 08:14:09 +02:00
parent 4c2ca04c47
commit efd581f875
1 changed files with 14 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
cpu-supplement/port.rst
View File

@ -222,9 +222,9 @@ switches to this dedicated stack. On architectures without hardware support
for a dedicated interrupt stack which is separate from those of the tasks,
RTEMS will support switching to a dedicated stack for interrupt processing.
Without a dedicated interrupt stack, every task in the system MUST have enough
Without a dedicated interrupt stack, every task in the system must have enough
stack space to accommodate the worst case stack usage of that particular task
and the interrupt service routines COMBINED. By supporting a dedicated
and the interrupt service routines combined. By supporting a dedicated
interrupt stack, RTEMS significantly lowers the stack requirements for each
task.
@ -232,16 +232,20 @@ A nested interrupt is processed similarly with the exception that since the CPU
is already executing on the interrupt stack, there is no need to switch to the
interrupt stack.
In some configurations, RTEMS allocates the interrupt stack from the Workspace
Area. The amount of memory allocated for the interrupt stack is user
configured and based upon the ``confdefs.h`` parameter
The interrupt stacks (one for each configured processor) are statically
allocated by the application configuration via ``<rtems/confdefs.h>`` in the
special section ``.rtemsstack``. This enables an optimal placement of the
interrupt stacks by the Board Support Package (BSP), e.g. a fast on-chip
memory. The amount of memory allocated for each interrupt stack is user
configured and based upon the ``<rtems/confdefs.h>`` parameter
``CONFIGURE_INTERRUPT_STACK_SIZE``. This parameter is described in detail in
the Configuring a System chapter of the User's Guide. On configurations in
which RTEMS allocates the interrupt stack, during the initialization process,
RTEMS will also install its interrupt stack. In other configurations, the
interrupt stack is allocated and installed by the Board Support Package (BSP).
the Configuring a System chapter of the User's Guide. Since interrupts are
disabled during the sequential system initialization and the
``_Thread_Start_multitasking()`` function does not return to the caller each
interrupt stack may be used for the initialization stack on the corresponding
processor.
In each of the architecture specific chapters, this section discesses the
In each of the architecture specific chapters, this section discusses the
interrupt response and control mechanisms of the architecture as they pertain
to RTEMS.