diff options
Diffstat (limited to 'cpukit/score/src/percpu.c')
-rw-r--r-- | cpukit/score/src/percpu.c | 151 |
1 files changed, 3 insertions, 148 deletions
diff --git a/cpukit/score/src/percpu.c b/cpukit/score/src/percpu.c index 7fbc1c8637..3bacbd7f55 100644 --- a/cpukit/score/src/percpu.c +++ b/cpukit/score/src/percpu.c @@ -3,8 +3,8 @@ * * @ingroup RTEMSScorePerCPU * - * @brief This source file contains a definition of ::_Per_CPU_Information and - * the implementation of _Per_CPU_State_change(). + * @brief This source file contains the uniprocessor definition of + * ::_Per_CPU_Information and some static assertions. */ /* @@ -21,10 +21,6 @@ #endif #include <rtems/score/percpu.h> -#include <rtems/score/assert.h> -#include <rtems/score/isrlock.h> -#include <rtems/score/smpimpl.h> -#include <rtems/config.h> RTEMS_STATIC_ASSERT( sizeof( CPU_Uint32ptr ) >= sizeof( uintptr_t ), @@ -36,148 +32,7 @@ RTEMS_STATIC_ASSERT( CPU_Uint32ptr_greater_equal_uint32_t ); -#if defined(RTEMS_SMP) - -ISR_LOCK_DEFINE( static, _Per_CPU_State_lock, "Per-CPU State" ) - -static void _Per_CPU_State_acquire( ISR_lock_Context *lock_context ) -{ - _ISR_lock_ISR_disable_and_acquire( &_Per_CPU_State_lock, lock_context ); -} - -static void _Per_CPU_State_release( ISR_lock_Context *lock_context ) -{ - _ISR_lock_Release_and_ISR_enable( &_Per_CPU_State_lock, lock_context ); -} - -static void _Per_CPU_State_busy_wait( - Per_CPU_Control *cpu, - Per_CPU_State new_state -) -{ - Per_CPU_State state; - - state = _Per_CPU_Get_state( cpu ); - - switch ( new_state ) { - case PER_CPU_STATE_REQUEST_START_MULTITASKING: - while ( - state != PER_CPU_STATE_READY_TO_START_MULTITASKING - && state != PER_CPU_STATE_SHUTDOWN - ) { - _Per_CPU_Perform_jobs( cpu ); - state = _Per_CPU_Get_state( cpu ); - } - break; - case PER_CPU_STATE_UP: - while ( - state != PER_CPU_STATE_REQUEST_START_MULTITASKING - && state != PER_CPU_STATE_SHUTDOWN - ) { - _Per_CPU_Perform_jobs( cpu ); - state = _Per_CPU_Get_state( cpu ); - } - break; - default: - /* No need to wait */ - break; - } -} - -static Per_CPU_State _Per_CPU_State_get_next( - Per_CPU_State current_state, - Per_CPU_State new_state -) -{ - switch ( current_state ) { - case PER_CPU_STATE_INITIAL: - switch ( new_state ) { - case PER_CPU_STATE_READY_TO_START_MULTITASKING: - case PER_CPU_STATE_SHUTDOWN: - /* Change is acceptable */ - break; - default: - new_state = PER_CPU_STATE_SHUTDOWN; - break; - } - break; - case PER_CPU_STATE_READY_TO_START_MULTITASKING: - switch ( new_state ) { - case PER_CPU_STATE_REQUEST_START_MULTITASKING: - case PER_CPU_STATE_SHUTDOWN: - /* Change is acceptable */ - break; - default: - new_state = PER_CPU_STATE_SHUTDOWN; - break; - } - break; - case PER_CPU_STATE_REQUEST_START_MULTITASKING: - switch ( new_state ) { - case PER_CPU_STATE_UP: - case PER_CPU_STATE_SHUTDOWN: - /* Change is acceptable */ - break; - default: - new_state = PER_CPU_STATE_SHUTDOWN; - break; - } - break; - default: - new_state = PER_CPU_STATE_SHUTDOWN; - break; - } - - return new_state; -} - -void _Per_CPU_State_change( - Per_CPU_Control *cpu, - Per_CPU_State new_state -) -{ - ISR_lock_Context lock_context; - Per_CPU_State next_state; - - _Per_CPU_State_busy_wait( cpu, new_state ); - - _Per_CPU_State_acquire( &lock_context ); - - next_state = _Per_CPU_State_get_next( _Per_CPU_Get_state( cpu ), new_state ); - _Per_CPU_Set_state( cpu, next_state ); - - if ( next_state == PER_CPU_STATE_SHUTDOWN ) { - uint32_t cpu_max = rtems_configuration_get_maximum_processors(); - uint32_t cpu_index; - - for ( cpu_index = 0 ; cpu_index < cpu_max ; ++cpu_index ) { - Per_CPU_Control *cpu_other = _Per_CPU_Get_by_index( cpu_index ); - - if ( cpu_other != cpu ) { - switch ( _Per_CPU_Get_state( cpu_other ) ) { - case PER_CPU_STATE_UP: - _SMP_Send_message( cpu_index, SMP_MESSAGE_SHUTDOWN ); - break; - default: - /* Nothing to do */ - break; - } - - _Per_CPU_Set_state( cpu_other, PER_CPU_STATE_SHUTDOWN ); - } - } - } - - _Per_CPU_State_release( &lock_context ); - - if ( - next_state == PER_CPU_STATE_SHUTDOWN - && new_state != PER_CPU_STATE_SHUTDOWN - ) { - _SMP_Fatal( SMP_FATAL_SHUTDOWN ); - } -} -#else +#if !defined(RTEMS_SMP) /* * On single core systems, we can efficiently directly access a single * statically allocated per cpu structure. And the fields are initialized |