This field is unused except for special case simulator clock drivers.
In these places use an alternative. Add and use
_Thread_Set_global_exit_status() and _Thread_Get_global_exit_status().
Eliminate copy and paste. Use the _Objects_Information_table since this
will take into account that more than one internal thread may exist,
e.g. MPCI thread or idle threads of secondary processors.
Delete bsp_smp_wait_for(). Other parts of the system work without
timeout, e.g. the spinlocks. Using a timeout here does not make the
system more robust.
Delete bsp_smp_cpu_state and replace it with Per_CPU_State. The
Per_CPU_State follows the Score naming conventions. Add
_Per_CPU_Change_state() and _Per_CPU_Wait_for_state() functions to
change and observe states.
Use Per_CPU_State in Per_CPU_Control instead of the anonymous integer.
Add _CPU_Processor_event_broadcast() and _CPU_Processor_event_receive()
functions provided by the CPU port. Use these functions in
_Per_CPU_Change_state() and _Per_CPU_Wait_for_state().
Add prototype for _SMP_Send_message().
Delete RTEMS_BSP_SMP_FIRST_TASK message. The first context switch is
now performed in rtems_smp_secondary_cpu_initialize(). Issuing the
first context switch in the context of the inter-processor interrupt is
not possible on systems with a modern interrupt controller. Such an
interrupt controler usually requires a handshake protocol with interrupt
acknowledge and end of interrupt signals. A direct context switch in an
interrupt handler circumvents the interrupt processing epilogue and may
leave the system in an inconsistent state.
Release lock in rtems_smp_process_interrupt() even if no message was
delivered. This prevents deadlock of the system.
Simplify and format _SMP_Send_message(),
_SMP_Request_other_cores_to_perform_first_context_switch(),
_SMP_Request_other_cores_to_dispatch() and
_SMP_Request_other_cores_to_shutdown().
Do not call bsp_smp_secondary_cpu_initialize() in
rtems_smp_secondary_cpu_initialize(). This allows more flexibilty in
the BSP low-level code. Specify context requirements for a call to
rtems_smp_secondary_cpu_initialize().
Call _SMP_Handler_initialize() later and move bsp_smp_initialize() into
_SMP_Handler_initialize(). Change bsp_smp_initialize() prototype to
match integer types of calling context.
The _Per_CPU_Information is part of the BSS segment and must be zero
initialized. Some processors may already poll some per-CPU fields and
wait for a state change at this point.
Move the .fast_text section after the .vector section. The .fast_test
section is normally not empty in case some functions should execute from
an internal SRAM. This would be also the area for the .vector section.
The vector table must be the first content of such an area.
The GNU assembler translates for example a
msr spsr, rN
into
msr SPSR_fc, rN
This would update only a subset of the register and leads to an
incomplete exceptions restore sequence resulting in system corruption.
Correct is this:
msr SPSR_fsxc, rN
Delete rtems_configuration_get_smp_maximum_processors(). Delete
rtems_configuration_smp_maximum_processors variable. Add
maximum_processors field to rtems_configuration_table if RTEMS_SMP is
defined. Add rtems_configuration_get_maximum_processors().
This header uses uint32_t but does not include stdint.h
This may cause problems when compiling applications that include BSP
headers that include this file (leon.h for example)
Sebastian Huber
Ralf Corsépius
Ralf Kirchner
Gedare Bloom
Andrei Mozzhuhin
Andreas Heinig
Daron Chabot
Chris Johns
Mohammed Khoory