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* rtems: Conditionally define rtems_interrupt_frameSebastian Huber2016-11-181-1/+1
| | | | Update #2808.
* score: Move CPU_PER_CPU_CONTROL_SIZESebastian Huber2016-11-182-23/+23
| | | | | Move CPU_PER_CPU_CONTROL_SIZE and the optional CPU_Per_CPU_control to <rtems/score/cpuimpl.h> to hide it from <rtems.h>.
* score: Remove obsolete definesSebastian Huber2016-11-181-23/+0
| | | | The thread dispatch inline option is no longer used.
* score: Move _CPU_Get_current_per_CPU_control()Sebastian Huber2016-11-102-19/+19
| | | | | Move _CPU_Get_current_per_CPU_control() from <rtems/score/cpu.h> to <rtems/score/cpuimpl.h>.
* score: Add optional _CPU_Get_thread_executing()Sebastian Huber2016-11-071-0/+12
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* score: Add <rtems/score/cpuimpl.h>Sebastian Huber2016-11-073-0/+35
| | | | | | The aim of this file is to encapsulate CPU port implementation details. This helps to hide implementation details from <rtems.h> which indirectly includes <rtems/score/cpu.h>.
* score: Fix C/C++ compatibility issueSebastian Huber2016-09-231-1/+5
| | | | | | | Only use CPU_Per_CPU_control if it contains at least one filed. In GNU C empty structures have a size of zero. In C++ structures have a non-zero size. In case CPU_PER_CPU_CONTROL_SIZE is defined to zero, then this structure is not used anymore.
* score: _CPU_SMP_Send_interrupt() documentationSebastian Huber2016-06-291-4/+0
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* score: Simplify priority bit map implementationSebastian Huber2016-06-081-3/+0
| | | | | | | | | | The priority bit map can deal with a maximum of 256 priority values ranging from 0 to 255. Consistently use an unsigned int for computation, due to the usual integer promotion rules. Make Priority_bit_map_Word definition architecture-independent and define it to uint16_t. This was already the case for all architectures except PowerPC. Adjust the PowerPC bitmap support accordingly.
* score: Delete CPU_USE_GENERIC_BITFIELD_DATASebastian Huber2016-06-081-10/+0
| | | | | | Rename __log2table into _Bitfield_Leading_zeros since it acually returns the count of leading zeros of an 8-bit integer. The value for zero is a bit odd. Provide it unconditionally.
* score: Add CPU_MAXIMUM_PROCESSORSSebastian Huber2016-03-041-0/+6
| | | | Maximum number of processors of all systems supported by this CPU port.
* no_cpu: Avoid SCORE_EXTERNSebastian Huber2016-02-171-1/+1
| | | | Update #2559.
* score: Introduce CPU_CACHE_LINE_BYTESSebastian Huber2016-01-261-13/+8
| | | | | Add CPU_CACHE_LINE_BYTES for the maximum cache line size in bytes. The actual processor may use no cache or a smaller cache line size.
* score: Delete obsolete CPU_TIMESTAMP_* definesSebastian Huber2016-01-251-68/+0
| | | | Update #2271.
* basedefs.h: Add and use RTEMS_NO_RETURNSebastian Huber2015-10-261-1/+1
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* SMP: Fix and optimize thread dispatchingSebastian Huber2015-09-281-14/+25
| | | | | | | | According to the C11 and C++11 memory models only a read-modify-write operation guarantees that we read the last value written in modification order. Avoid the sequential consistent thread fence and instead use the inter-processor interrupt to set the thread dispatch necessary indicator.
* cpukit: add and use CPU_Uint32ptr typeGedare Bloom2015-03-161-0/+3
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* score: Delete unused CPU_UNROLL_ENQUEUE_PRIORITYSebastian Huber2015-03-051-23/+0
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* score: Add _CPU_SMP_Prepare_start_multitasking()Sebastian Huber2015-02-171-0/+12
| | | | Update #2268.
* Let CPU/BSP Fatal handler have access to sourceDaniel Hellstrom2014-09-101-1/+1
| | | | | | | | | Without the source the error code does not say that much. Let it be up to the CPU/BSP to determine the error code reported on fatal shutdown. This patch does not change the current behaviour, just adds the option to handle the source of the fatal halt.
* score: PR2183: Fix context switch on SMPSebastian Huber2014-07-041-2/+31
| | | | | | | | Fix context switch on SMP for ARM, PowerPC and SPARC. Atomically test and set the is executing indicator of the heir context to ensure that at most one processor uses the heir context. Break the busy wait loop also due to heir updates.
* score: Fix CPU context usage on SMPSebastian Huber2014-05-081-3/+23
| | | | | | | | | | We must not alter the is executing indicator in _CPU_Context_Initialize() since this would cause an invalid state during a self restart. The is executing indicator must be valid at creation time since otherwise _Thread_Kill_zombies() uses an undefined value for not started threads. This could result in a system life lock.
* score: Implement forced thread migrationSebastian Huber2014-05-071-0/+18
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | The current implementation of task migration in RTEMS has some implications with respect to the interrupt latency. It is crucial to preserve the system invariant that a task can execute on at most one processor in the system at a time. This is accomplished with a boolean indicator in the task context. The processor architecture specific low-level task context switch code will mark that a task context is no longer executing and waits that the heir context stopped execution before it restores the heir context and resumes execution of the heir task. So there is one point in time in which a processor is without a task. This is essential to avoid cyclic dependencies in case multiple tasks migrate at once. Otherwise some supervising entity is necessary to prevent life-locks. Such a global supervisor would lead to scalability problems so this approach is not used. Currently the thread dispatch is performed with interrupts disabled. So in case the heir task is currently executing on another processor then this prolongs the time of disabled interrupts since one processor has to wait for another processor to make progress. It is difficult to avoid this issue with the interrupt latency since interrupts normally store the context of the interrupted task on its stack. In case a task is marked as not executing we must not use its task stack to store such an interrupt context. We cannot use the heir stack before it stopped execution on another processor. So if we enable interrupts during this transition we have to provide an alternative task independent stack for this time frame. This issue needs further investigation.
* score: Statically initialize _ISR_Vector_tableSebastian Huber2014-04-291-6/+11
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* score: Add _CPU_Get_current_per_CPU_control()Sebastian Huber2014-04-281-0/+18
| | | | | | | | | Add optional method _CPU_Get_current_per_CPU_control() to obtain the per-CPU control of the current processor. This is optional. Not every CPU port needs this. It is only an optional optimization variant. In case this macro is undefined, the default implementation using the current processor index will be used.
* score: SMP initialization changesSebastian Huber2014-04-141-8/+36
| | | | | | | | | | | | | | | | | Add and use _CPU_SMP_Start_processor(). Add and use _CPU_SMP_Finalize_initialization(). This makes most _CPU_SMP_Initialize() functions a bit simpler since we can calculate the minimum value of the count of processors requested by the application configuration and the count of physically or virtually available processors in the high-level code. The CPU port has now the ability to signal a processor start failure. With the support for clustered/partitioned scheduling the presence of particular processors can be configured to be optional or mandatory. There will be a fatal error only in case mandatory processors are not present. The CPU port may use a timeout to monitor the start of a processor.
* score: Clarify CPU port alignment requirementsSebastian Huber2014-04-071-7/+9
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* score: Rename Priority_bit_map_ControlSebastian Huber2014-04-032-2/+2
| | | | Rename Priority_bit_map_Control in Priority_bit_map_Word.
* Change all references of rtems.com to rtems.org.Chris Johns2014-03-217-7/+7
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* score: SMP initialization and shutdown changesSebastian Huber2014-03-061-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Rename _SMP_Request_other_cores_to_perform_first_context_switch() into _SMP_Request_start_multitasking() since this requests now a multitasking start on all configured and available processors. The name corresponds _Thread_Start_multitasking() and _SMP_Start_multitasking_on_secondary_processor() actions issued in response to this request. Move in source file to right place. Rename PER_CPU_STATE_READY_TO_BEGIN_MULTITASKING into PER_CPU_STATE_READY_TO_START_MULTITASKING. Rename PER_CPU_STATE_BEGIN_MULTITASKING into PER_CPU_STATE_REQUEST_START_MULTITASKING. Rename _SMP_Request_other_cores_to_shutdown() into _SMP_Request_shutdown(). Add a per-CPU state lock to protect all changes. This was necessary to offer a controlled shutdown of the system (atomic read/writes alone are not sufficient for this kind of synchronization). Add documentation for Per_CPU_State. Delete debug output. New tests smptests/smpfatal01 and smptests/smpfatal02.
* score: _CPU_SMP_Get_current_processor()Sebastian Huber2014-02-211-2/+1
| | | | | | | Remove RTEMS_COMPILER_PURE_ATTRIBUTE from _SMP_Get_current_processor() and all _CPU_SMP_Get_current_processor(). Make inline ASM statements volatile again. Test smptests/smpmigration01 showed that GCC optimizes too much otherwise.
* score: Rename bsp_smp_initialize()Sebastian Huber2014-02-191-0/+18
| | | | | Rename bsp_smp_initialize() into _CPU_SMP_Initialize() since every CPU port must supply this function.
* score: Use atomic API for SMP lockSebastian Huber2014-02-173-123/+0
| | | | | Use a ticket lock implementation based on atomic operations. Delete CPU port specific SMP lock implementations.
* score: Add CPU counter supportSebastian Huber2014-02-143-0/+62
| | | | | | | | | Add a CPU counter interface to allow access to a free-running counter. It is useful to measure short time intervals. This can be used for example to enable profiling of critical low-level functions. Add two busy wait functions rtems_counter_delay_ticks() and rtems_counter_delay_nanoseconds() implemented via the CPU counter.
* Add thread-local storage (TLS) supportSebastian Huber2014-02-041-1/+2
| | | | | Tested and implemented on ARM, m68k, PowerPC and SPARC. Other architectures need more work.
* no_cpu/cpusmplock.h: Clean up to be compilableJoel Sherrill2013-12-141-0/+4
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* no_cpu/.../cpu.h: Comment improvementJoel Sherrill2013-11-141-0/+5
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* score/cpu: Add CPU_Per_CPU_controlSebastian Huber2013-08-091-0/+18
| | | | Add CPU port specific per-CPU control.
* smp: Rename _CPU_Processor_event_receive()Sebastian Huber2013-07-171-2/+2
| | | | Rename to _CPU_SMP_Processor_event_receive().
* smp: Rename _CPU_Processor_event_broadcast()Sebastian Huber2013-07-171-2/+2
| | | | Rename to _CPU_SMP_Processor_event_broadcast().
* smp: Add and use _CPU_SMP_Send_interrupt()Sebastian Huber2013-07-171-0/+10
| | | | Delete bsp_smp_interrupt_cpu().
* smp: Add and use _CPU_SMP_Get_current_processor()Sebastian Huber2013-07-171-0/+13
| | | | | | | | | | Add and use _SMP_Get_current_processor() and rtems_smp_get_current_processor(). Delete bsp_smp_interrupt_cpu(). Change type of current processor index from int to uint32_t to match _SMP_Processor_count type.
* documentation: Fix Doxygen commentsSebastian Huber2013-06-141-4/+4
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* smp: New SMP lock APISebastian Huber2013-05-313-0/+119
| | | | | | | | | | | | | | Move the SMP lock implementation to the CPU port. An optimal SMP lock implementation is highly architecture dependent. For example the memory models may be fundamentally different. The new SMP lock API has a flaw. It does not provide the ability to use a local context for acquire and release pairs. Such a context is necessary to implement for example the Mellor-Crummey and Scott (MCS) locks. The SMP lock is currently used in _Thread_Disable_dispatch() and _Thread_Enable_dispatch() and makes them to a giant lock acquire and release. Since these functions do not pass state information via a local context there is currently no use case for such a feature.
* smp: Simplify SMP initialization sequenceSebastian Huber2013-05-291-0/+31
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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().
* score: Add CPU context validationSebastian Huber2013-05-101-0/+31
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* RTEMS: Delete ChangeLog files.Gedare Bloom2013-03-081-435/+0
| | | | | | | | | This commit deletes all RTEMS ChangeLog files. These files have been abandoned since converting to git version control. The historical data may be recovered by checking out any commit before this one. Most of the contents of these ChangeLog files can also be found in the git log. Two external ChangeLog files, ChangeLog.slac and ChangeLog.zlib, remain.
* cpukit: Use Consistent Beginning of Doxygen Group NotationJoel Sherrill2013-01-101-4/+4
| | | | | This is the result of a sed script which converts all uses of @{ into a consistent form.
* cpukit: Add EOL on files missing EOL at EOFJoel Sherrill2013-01-101-1/+1
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* score: Doxygen Clean Up Task #5Alex Ivanov2013-01-023-669/+708
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