[PATCH] Add documentation for profiling

[Sebastian Huber]

---
 doc/bsp_howto/support.t      |   11 +++++++++++
 doc/cpu_supplement/general.t |   12 ++++++++++++
 2 files changed, 23 insertions(+), 0 deletions(-)

diff --git a/doc/bsp_howto/support.t b/doc/bsp_howto/support.t
index 843093a..4441636 100644
--- a/doc/bsp_howto/support.t
+++ b/doc/bsp_howto/support.t
@@ -283,6 +283,17 @@ Interrupt Controller model which does not require the BSP to implement
 @code{set_vector}.  BSPs for these architectures must provide a different
 set of support routines.
 
+ at section Interrupt Delay Profiling
+
+The RTEMS profiling needs support by the BSP for the interrupt delay times.  In
+case profiling is enabled via the RTEMS build configuration option
+ at code{--enable-profiling} (in this case the pre-processor symbol
+ at code{RTEMS_PROFILING} is defined) a BSP may provide data for the interrupt
+delay times.  The BSP can feed interrupt delay times with the
+ at code{_Profiling_Update_max_interrupt_delay()} function
+(@code{#include <rtems/score/profiling.h>}).  For an example please have a look
+at @code{c/src/lib/libbsp/sparc/leon3/clock/ckinit.c}.
+
 @section Programmable Interrupt Controller API
 
 A BSP can use the PIC API to install Interrupt Service Routines through
diff --git a/doc/cpu_supplement/general.t b/doc/cpu_supplement/general.t
index deca4de..9c952a7 100644
--- a/doc/cpu_supplement/general.t
+++ b/doc/cpu_supplement/general.t
@@ -362,6 +362,18 @@ provide the following two functions
 counter values.
 @end itemize
 
+ at section Interrupt Profiling
+
+The RTEMS profiling needs support by the CPU port for the interrupt entry and
+exit times.  In case profiling is enabled via the RTEMS build configuration
+option @code{--enable-profiling} (in this case the pre-processor symbol
+ at code{RTEMS_PROFILING} is defined) the CPU port may provide data for the
+interrupt entry and exit times of the outer-most interrupt.  The CPU port can
+feed interrupt entry and exit times with the
+ at code{_Profiling_Outer_most_interrupt_entry_and_exit()} function
+(@code{#include <rtems/score/profiling.h>}).  For an example please have a look
+at @code{cpukit/score/cpu/arm/arm_exc_interrupt.S}.
+
 @c
 @c
 @c
-- 
1.7.7