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/**
* @file
*
* @brief Allocate and Initialize Per CPU Structures
* @ingroup PerCPU
*/
/*
* COPYRIGHT (c) 1989-2011.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/system.h>
#include <rtems/score/thread.h>
#include <rtems/score/percpu.h>
#include <rtems/score/wkspace.h>
#include <rtems/config.h>
#include <string.h>
#if defined(RTEMS_SMP)
#include <rtems/score/smp.h>
void _SMP_Handler_initialize(void)
{
uint32_t max_cpus = rtems_configuration_get_maximum_processors();
uint32_t cpu;
/*
* Initialize per cpu pointer table
*/
_Per_CPU_Information_p[0] = &_Per_CPU_Information[0];
for ( cpu = 1 ; cpu < max_cpus; ++cpu ) {
Per_CPU_Control *p = &_Per_CPU_Information[cpu];
_Per_CPU_Information_p[cpu] = p;
#if CPU_ALLOCATE_INTERRUPT_STACK == TRUE
{
size_t size = rtems_configuration_get_interrupt_stack_size();
uintptr_t ptr;
p->interrupt_stack_low = _Workspace_Allocate_or_fatal_error( size );
ptr = (uintptr_t) _Addresses_Add_offset( p->interrupt_stack_low, size );
ptr &= ~(CPU_STACK_ALIGNMENT - 1);
p->interrupt_stack_high = (void *)ptr;
}
#endif
}
/*
* Discover and initialize the secondary cores in an SMP system.
*/
max_cpus = bsp_smp_initialize( max_cpus );
_SMP_Processor_count = max_cpus;
for ( cpu = 1 ; cpu < max_cpus; ++cpu ) {
_Per_CPU_Wait_for_state(
&_Per_CPU_Information[ cpu ],
PER_CPU_STATE_READY_TO_BEGIN_MULTITASKING
);
}
}
void _Per_CPU_Change_state(
Per_CPU_Control *per_cpu,
Per_CPU_State new_state
)
{
per_cpu->state = new_state;
_CPU_SMP_Processor_event_broadcast();
}
void _Per_CPU_Wait_for_state(
const Per_CPU_Control *per_cpu,
Per_CPU_State desired_state
)
{
while ( per_cpu->state != desired_state ) {
_CPU_Processor_event_receive();
}
}
#else
/*
* On single core systems, we can efficiently directly access a single
* statically allocated per cpu structure. And the fields are initialized
* as individual elements just like it has always been done.
*/
Per_CPU_Control _Per_CPU_Information[1];
#endif
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