source: rtems/cpukit/sapi/src/exinit.c @ f972294d

4.104.114.84.9
Last change on this file since f972294d was f972294d, checked in by Joel Sherrill <joel.sherrill@…>, on Feb 14, 1996 at 6:59:37 PM

idle thread now created before system initialization thread.

Also system initialization thread only created in MP systems.

  • Property mode set to 100644
File size: 6.8 KB
Line 
1/*
2 *  Initialization Manager
3 *
4 *  COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.
5 *  On-Line Applications Research Corporation (OAR).
6 *  All rights assigned to U.S. Government, 1994.
7 *
8 *  This material may be reproduced by or for the U.S. Government pursuant
9 *  to the copyright license under the clause at DFARS 252.227-7013.  This
10 *  notice must appear in all copies of this file and its derivatives.
11 *
12 *  $Id$
13 */
14
15/*
16 *  INIT is defined so all of the data will be included in this
17 *  file.
18 */
19
20#define INIT
21
22#include <rtems/system.h>
23#include <rtems/config.h>
24#include <rtems/debug.h>
25#include <rtems/extension.h>
26#include <rtems/fatal.h>
27#include <rtems/init.h>
28#include <rtems/io.h>
29#include <rtems/score/sysstate.h>
30
31#include <rtems/score/apiext.h>
32#include <rtems/score/copyrt.h>
33#include <rtems/score/heap.h>
34#include <rtems/score/interr.h>
35#include <rtems/intthrd.h>
36#include <rtems/score/isr.h>
37#include <rtems/score/mpci.h>
38#include <rtems/score/priority.h>
39#include <rtems/score/thread.h>
40#include <rtems/score/tod.h>
41#include <rtems/score/userext.h>
42#include <rtems/score/watchdog.h>
43#include <rtems/score/wkspace.h>
44
45#include <rtems/directives.h>
46#include <rtems/sptables.h>
47
48#include <rtems/rtems/rtemsapi.h>
49
50/*PAGE
51 *
52 *  rtems_initialize_executive
53 *
54 *  This directive initializes all the kernels data structures
55 *  to the states necessary for the kernel to begin execution.  All
56 *  include files that contain global variable definitions should be
57 *  included in this file.  The system threads and initialization threads
58 *  are created and started by this routine.  This routine then
59 *  initiates multithreading.
60 *
61 *  Input parameters:
62 *    configuration_table - pointer to the user's configuration table
63 *    cpu_table           - pointer to the user's CPU configuration table
64 *
65 *  Output parameters:  NONE
66 */
67
68void rtems_initialize_executive(
69  rtems_configuration_table *configuration_table,
70  rtems_cpu_table           *cpu_table
71)
72{
73  rtems_interrupt_level bsp_level;
74
75  bsp_level = rtems_initialize_executive_early(configuration_table, cpu_table);
76  rtems_initialize_executive_late( bsp_level );
77}
78
79rtems_interrupt_level rtems_initialize_executive_early(
80  rtems_configuration_table *configuration_table,
81  rtems_cpu_table           *cpu_table
82)
83{
84  rtems_interrupt_level        bsp_level;
85  rtems_multiprocessing_table *multiprocessing_table;
86
87  /*
88   *  Dispatching and interrupts are disabled until the end of the
89   *  initialization sequence.  This prevents an inadvertent context
90   *  switch before the executive is initialized.
91   */
92
93  _ISR_Disable( bsp_level );
94
95  if ( cpu_table == NULL )
96    _Internal_error_Occurred(
97      INTERNAL_ERROR_CORE,
98      TRUE,
99      INTERNAL_ERROR_NO_CONFIGURATION_TABLE
100    );
101
102  /*
103   *  Initialize the system state based on whether this is an MP system.
104   */
105
106  multiprocessing_table = configuration_table->User_multiprocessing_table;
107
108  _System_state_Handler_initialization(
109    (multiprocessing_table) ? TRUE : FALSE
110  );
111
112  /*
113   *  Provided just for user convenience.
114   */
115
116  _Configuration_Table    = configuration_table;
117  _Configuration_MP_table = multiprocessing_table;
118
119  /*
120   *  Internally we view single processor systems as a very restricted
121   *  multiprocessor system.
122   */
123
124  if ( multiprocessing_table == NULL )
125    multiprocessing_table = 
126      (void *)&_Initialization_Default_multiprocessing_table;
127
128  if ( cpu_table == NULL )
129    _Internal_error_Occurred(
130      INTERNAL_ERROR_CORE,
131      TRUE,
132      INTERNAL_ERROR_NO_CPU_TABLE
133    );
134
135  _CPU_Initialize( cpu_table, _Thread_Dispatch );
136
137  /*
138   *  Do this as early as possible to insure no debugging output
139   *  is even attempted to be printed.
140   */
141
142  _Debug_Manager_initialization();
143
144  _API_extensions_Initialization();
145
146  _Thread_Dispatch_initialization();
147
148  _User_extensions_Handler_initialization(
149    configuration_table->User_extension_table
150  );
151
152  _Workspace_Handler_initialization(
153     (void *)configuration_table->work_space_start,
154     configuration_table->work_space_size
155  );
156
157  _ISR_Handler_initialization();
158
159  _Objects_Handler_initialization(
160    multiprocessing_table->node,
161    multiprocessing_table->maximum_nodes,
162    multiprocessing_table->maximum_global_objects
163  );
164
165  _Priority_Handler_initialization();
166
167  _Watchdog_Handler_initialization();
168
169  _TOD_Handler_initialization( configuration_table->microseconds_per_tick );
170
171  _Thread_Handler_initialization(
172    configuration_table->ticks_per_timeslice,
173    configuration_table->maximum_extensions,
174    multiprocessing_table->maximum_proxies
175  );
176
177  /*
178   *  No threads should be created before this point!!! _Thread_Executing
179   *  and _Thread_Heir are not set yet.
180   */
181
182  _Internal_threads_Initialization();
183
184  _MPCI_Handler_initialization(
185    multiprocessing_table->User_mpci_table,
186    RTEMS_TIMEOUT
187  );
188
189/* MANAGERS */
190
191  _Extension_Manager_initialization( configuration_table->maximum_extensions );
192
193  _IO_Manager_initialization(
194    configuration_table->Device_driver_table,
195    configuration_table->number_of_device_drivers,
196    configuration_table->maximum_devices
197  );
198
199  _RTEMS_API_Initialize( configuration_table );
200
201  if ( cpu_table->pretasking_hook )
202    (*cpu_table->pretasking_hook)();
203
204  _Internal_threads_Start();
205
206  _System_state_Set( SYSTEM_STATE_BEFORE_MULTITASKING );
207
208  /*
209   *  Run the API and BSPs predriver hook.
210   */
211 
212  _API_extensions_Run_predriver();
213 
214  if ( _CPU_Table.predriver_hook )
215    (*_CPU_Table.predriver_hook)();
216 
217  /*
218   *  Initialize all the device drivers and initialize the MPCI layer.
219   *
220   *  NOTE:  The MPCI may be build upon a device driver.
221   */
222 
223  _IO_Initialize_all_drivers();
224 
225  if ( _System_state_Is_multiprocessing ) {
226    _MPCI_Initialization();
227    _Internal_threads_MP_Send_process_packet(
228      INTERNAL_THREADS_MP_SYSTEM_VERIFY
229    );
230  }
231 
232  /*
233   *  Run the APIs and BSPs postdriver hooks.
234   *
235   *  The API extensions are supposed to create user initialization tasks.
236   */
237 
238  _API_extensions_Run_postdriver();
239 
240  if ( _CPU_Table.postdriver_hook )
241    (*_CPU_Table.postdriver_hook)();
242
243  return bsp_level;
244}
245
246void rtems_initialize_executive_late(
247  rtems_interrupt_level bsp_level
248)
249{
250
251  _System_state_Set( SYSTEM_STATE_BEGIN_MULTITASKING );
252
253  _Thread_Start_multitasking();
254
255  /*
256   *  Restore the interrupt level to what the BSP had.  Technically,
257   *  this is unnecessary since the BSP should have all interrupts
258   *  disabled when rtems_initialize_executive is invoked.  But this keeps
259   *  the ISR Disable/Enable calls paired.
260   */
261
262  _ISR_Enable( bsp_level );
263}
264
265/*PAGE
266 *
267 *  rtems_shutdown_executive
268 *
269 *  This kernel routine shutdowns the executive.  It halts multitasking
270 *  and returns control to the application execution "thread" which
271 *  initialially invoked the rtems_initialize_executive directive.
272 *
273 *  Input parameters:   NONE
274 *
275 *  Output parameters:  NONE
276 */
277
278void rtems_shutdown_executive(
279   unsigned32 result
280)
281{
282  _Thread_Stop_multitasking();
283}
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