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/*
* Thread Handler
*
*
* COPYRIGHT (c) 1989-1999.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* $Id$
*/
#include <rtems/system.h>
#include <rtems/score/apiext.h>
#include <rtems/score/context.h>
#include <rtems/score/interr.h>
#include <rtems/score/isr.h>
#include <rtems/score/object.h>
#include <rtems/score/priority.h>
#include <rtems/score/states.h>
#include <rtems/score/sysstate.h>
#include <rtems/score/thread.h>
#include <rtems/score/threadq.h>
#include <rtems/score/userext.h>
#include <rtems/score/wkspace.h>
/*PAGE
*
* _Thread_Start_multitasking
*
* This kernel routine readies the requested thread, the thread chain
* is adjusted. A new heir thread may be selected.
*
* Input parameters:
* system_thread - pointer to system initialization thread control block
* idle_thread - pointer to idle thread control block
*
* Output parameters: NONE
*
* NOTE: This routine uses the "blocking" heir selection mechanism.
* This insures the correct heir after a thread restart.
*
* INTERRUPT LATENCY:
* ready chain
* select heir
*/
void _Thread_Start_multitasking( void )
{
/*
* The system is now multitasking and completely initialized.
* This system thread now either "goes away" in a single processor
* system or "turns into" the server thread in an MP system.
*/
_System_state_Set( SYSTEM_STATE_UP );
_Context_Switch_necessary = FALSE;
_Thread_Executing = _Thread_Heir;
/*
* Get the init task(s) running.
*
* Note: Thread_Dispatch() is normally used to dispatch threads. As
* part of its work, Thread_Dispatch() restores floating point
* state for the heir task.
*
* This code avoids Thread_Dispatch(), and so we have to restore
* (actually initialize) the floating point state "by hand".
*
* Ignore the CPU_USE_DEFERRED_FP_SWITCH because we must always
* switch in the first thread if it is FP.
*/
#if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE )
/*
* don't need to worry about saving BSP's floating point state
*/
if ( _Thread_Heir->fp_context != NULL )
_Context_Restore_fp( &_Thread_Heir->fp_context );
#endif
_Context_Switch( &_Thread_BSP_context, &_Thread_Heir->Registers );
}
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