source: rtems/c/src/lib/libbsp/powerpc/psim/startup/bspstart.c @ bd9c3d1

4.104.114.84.9
Last change on this file since bd9c3d1 was bd9c3d1, checked in by Joel Sherrill <joel.sherrill@…>, on Apr 15, 1998 at 8:50:31 PM

Numerous changes which in total greatly reduced the amount of source
code in each BSP's bspstart.c. These changes were:

+ confdefs.h now knows libio's semaphore requirements
+ shared/main.c now copies Configuration to BSP_Configuration
+ shared/main.c fills in the Cpu_table with default values

This removed the need for rtems_libio_config() and the constant
BSP_LIBIO_MAX_FDS in every BSP. Plus now the maximum number of open
files can now be set on the gcc command line.

  • Property mode set to 100644
File size: 6.4 KB
Line 
1/*
2 *  This set of routines starts the application.  It includes application,
3 *  board, and monitor specific initialization and configuration.
4 *  The generic CPU dependent initialization has been performed
5 *  before any of these are invoked.
6 *
7 *  COPYRIGHT (c) 1989-1998.
8 *  On-Line Applications Research Corporation (OAR).
9 *  All rights assigned to U.S. Government, 1994.
10 *
11 *  The license and distribution terms for this file may be
12 *  found in the file LICENSE in this distribution or at
13 *  http://www.OARcorp.com/rtems/license.html.
14 *
15 *  $Id$
16 */
17
18#include <bsp.h>
19#include <rtems/libio.h>
20
21#include <libcsupport.h>
22
23#include <string.h>
24#include <fcntl.h>
25
26/*
27 *  The original table from the application and our copy of it with
28 *  some changes.
29 */
30 
31extern rtems_configuration_table  Configuration;
32rtems_configuration_table         BSP_Configuration;
33
34rtems_cpu_table   Cpu_table;
35rtems_unsigned32  bsp_isr_level;
36
37/*
38 *  Tells us where to put the workspace in case remote debugger is present.
39 */
40
41#if 0
42extern rtems_unsigned32  rdb_start;
43#endif
44
45/*
46 * Amount to increment itimer by each pass
47 * It is a variable instead of a #define to allow the 'looptest'
48 * script to bump it without recompiling rtems
49 *
50 *  NOTE:  This is based on the PA-RISC simulator.  I don't know if we
51 *         can actually pull this trick on the PPC simulator.
52 */
53
54rtems_unsigned32 CPU_PPC_CLICKS_PER_TICK;
55
56#if PSIM_FAST_IDLE
57
58/*
59 * Many of the tests are very slow on the simulator because they have
60 * have 5 second delays hardwired in.
61 *
62 * Try to speed those tests up by speeding up the clock when in the idle task.
63 *
64 *  NOTE:  At the current setting, 5 second delays in the tests take
65 *         approximately 5 seconds of wall time.
66 */
67
68rtems_extension fast_idle_switch_hook(
69  rtems_tcb *current_task,
70  rtems_tcb *heir_task
71)
72{
73    static rtems_unsigned32 normal_clock = ~0;
74    static rtems_unsigned32 fast_clock;
75
76    /* init our params on first call */
77    if (normal_clock == (rtems_unsigned32) ~0)
78    {
79        normal_clock = CPU_PPC_CLICKS_PER_TICK;
80        fast_clock = 10000;
81#if 0
82        fast_clock = CPU_PPC_CLICKS_PER_TICK / 0x10 ;
83#endif
84        if (fast_clock == 0)    /* handle pathological case */
85            fast_clock++;
86    }
87
88    /*
89     * Run the clock faster when idle is in place.
90     */
91
92    if (heir_task == _Thread_Idle)
93        CPU_PPC_CLICKS_PER_TICK = fast_clock;
94    else if (current_task == _Thread_Idle)
95        CPU_PPC_CLICKS_PER_TICK = normal_clock;
96}
97
98#endif
99
100/*
101 *  Use the shared implementations of the following routines
102 */
103 
104void bsp_postdriver_hook(void);
105void bsp_libc_init( void *, unsigned32, int );
106
107/*
108 *  bsp_pretasking_hook
109 *
110 *  BSP pretasking hook.  Called just before drivers are initialized.
111 *  Used to setup libc and install any BSP extensions.
112 */
113
114void bsp_pretasking_hook(void)
115{
116  extern int end;
117  rtems_unsigned32 heap_start;
118  rtems_unsigned32 heap_size;
119
120  heap_start = (rtems_unsigned32) &end;
121  if (heap_start & (CPU_ALIGNMENT-1))
122    heap_start = (heap_start + CPU_ALIGNMENT) & ~(CPU_ALIGNMENT-1);
123
124  heap_size = BSP_Configuration.work_space_start - (void *)&end;
125  heap_size &= 0xfffffff0;  /* keep it as a multiple of 16 bytes */
126
127  bsp_libc_init((void *) heap_start, heap_size, 0);
128
129#if PSIM_FAST_IDLE
130  /*
131   *  Install the fast idle task switch extension
132   *
133   *  On MP systems, might not want to do this; it confuses at least
134   *  one test (mp06) on the PA-RISC simulator
135   */
136
137#if 0
138  if (BSP_Configuration.User_multiprocessing_table == 0)
139#endif
140  {
141    rtems_extensions_table  fast_idle_extension;
142    rtems_id                extension_id;
143    rtems_status_code       rc;
144
145    memset(&fast_idle_extension, 0, sizeof(fast_idle_extension));
146
147    fast_idle_extension.thread_switch  = fast_idle_switch_hook;
148
149    rc = rtems_extension_create(
150      rtems_build_name('F', 'D', 'L', 'E'),
151      &fast_idle_extension, 
152      &extension_id
153    );
154    if (rc != RTEMS_SUCCESSFUL)
155      rtems_fatal_error_occurred(rc);
156  }
157#endif
158
159#ifdef RTEMS_DEBUG
160  rtems_debug_enable( RTEMS_DEBUG_ALL_MASK );
161#endif
162
163}
164
165/*
166 *  bsp_start
167 *
168 *  This routine does the bulk of the system initialization.
169 */
170
171void bsp_start( void )
172{
173  unsigned char *work_space_start;
174
175#if 0
176  /*
177   * Set MSR to show vectors at 0 XXX
178   */
179  _CPU_MSR_Value( msr_value );
180  msr_value &= ~PPC_MSR_EP;
181  _CPU_MSR_SET( msr_value );
182#endif
183
184  /*
185   * Set up our hooks
186   * Make sure libc_init is done before drivers initialized so that
187   * they can use atexit()
188   */
189
190  Cpu_table.pretasking_hook = bsp_pretasking_hook;    /* init libc, etc. */
191  Cpu_table.postdriver_hook = bsp_postdriver_hook;
192
193  /*
194   *  Is this true?
195   *
196   *  PSIM does zero out memory BUT only when IT begins execution.  Thus
197   *  if we want to have a clean slate in the workspace each time we
198   *  begin execution of OUR application, then we must zero the workspace.
199   *
200   *  It is true that it takes simulated time to clear the memory.
201   */
202
203  Cpu_table.do_zero_of_workspace = FALSE;
204
205  Cpu_table.interrupt_stack_size = (12 * 1024);
206
207  /*
208   *  The monitor likes the exception table to be at 0x0.
209   */
210
211  Cpu_table.exceptions_in_RAM = TRUE;
212
213#if defined(RTEMS_POSIX_API)
214  BSP_Configuration.work_space_size *= 3;
215#endif
216
217
218#if 0
219  work_space_start =
220    (unsigned char *)rdb_start - BSP_Configuration.work_space_size;
221#endif
222
223  work_space_start = 
224    (unsigned char *)&RAM_END - BSP_Configuration.work_space_size;
225
226  if ( work_space_start <= (unsigned char *)&end ) {
227    DEBUG_puts( "bspstart: Not enough RAM!!!\n" );
228    bsp_cleanup();
229  }
230
231  BSP_Configuration.work_space_start = work_space_start;
232
233#ifdef STACK_CHECKER_ON
234  /*
235   * Add 1 extension for stack checker
236   */
237
238  BSP_Configuration.maximum_extensions++;
239#endif
240
241#if PSIM_FAST_IDLE
242  /*
243   * Add 1 extension for fast idle
244   */
245
246  BSP_Configuration.maximum_extensions++;
247#endif
248
249  /*
250   * Set the "clicks per tick" for the simulator
251   *  used by XXX/clock/clock.c to schedule interrupts
252   *
253   *  NOTE: On psim, each click of the decrementer register corresponds
254   *        to 1 instruction.  By setting this to 100, we are indicating
255   *        that we are assuming it can execute 100 instructions per
256   *        microsecond.  This corresponds to sustaining 1 instruction
257   *        per cycle at 100 Mhz.  Whether this is a good guess or not
258   *        is anyone's guess.
259   */
260
261  {
262    extern int PSIM_INSTRUCTIONS_PER_MICROSECOND;
263
264    CPU_PPC_CLICKS_PER_TICK = BSP_Configuration.microseconds_per_tick * 
265      (int) &PSIM_INSTRUCTIONS_PER_MICROSECOND;
266  }
267}
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