source: rtems/c/src/lib/libbsp/i386/force386/startup/bspstart.c @ ac7d5ef0

4.104.114.84.95
Last change on this file since ac7d5ef0 was ac7d5ef0, checked in by Joel Sherrill <joel.sherrill@…>, on May 11, 1995 at 5:39:37 PM

Initial revision

  • Property mode set to 100644
File size: 3.2 KB
Line 
1/*  bsp_start()
2 *
3 *  This routine starts the application.  It includes application,
4 *  board, and monitor specific initialization and configuration.
5 *  The generic CPU dependent initialization has been performed
6 *  before this routine is invoked.
7 *
8 *  INPUT:  NONE
9 *
10 *  OUTPUT: NONE
11 *
12 *  COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.
13 *  On-Line Applications Research Corporation (OAR).
14 *  All rights assigned to U.S. Government, 1994.
15 *
16 *  This material may be reproduced by or for the U.S. Government pursuant
17 *  to the copyright license under the clause at DFARS 252.227-7013.  This
18 *  notice must appear in all copies of this file and its derivatives.
19 *
20 *  $Id$
21 */
22
23#include <rtems.h>
24#include <bsp.h>
25#include <libcsupport.h>
26
27#include <stackchk.h>
28
29/*
30 *  The original table from the application and our copy of it with
31 *  some changes.
32 */
33
34extern rtems_configuration_table  Configuration;
35rtems_configuration_table  BSP_Configuration;
36
37rtems_cpu_table Cpu_table;
38
39/*      Initialize whatever libc we are using
40 *      called from postdriver hook
41 */
42
43void bsp_libc_init()
44{
45    extern int end;
46    rtems_unsigned32        heap_start;
47
48    heap_start = (rtems_unsigned32) &end;
49    if (heap_start & (CPU_ALIGNMENT-1))
50        heap_start = (heap_start + CPU_ALIGNMENT) & ~(CPU_ALIGNMENT-1);
51
52    RTEMS_Malloc_Initialize((void *) heap_start, 64 * 1024, 0);
53
54    /*
55     * Set up for the libc handling.
56     */
57
58    if (BSP_Configuration.ticks_per_timeslice > 0)
59        libc_init(1);                /* reentrant if possible */
60    else
61        libc_init(0);                /* non-reentrant */
62
63    /*
64     *  Initialize the stack bounds checker
65     */
66
67#ifdef STACK_CHECKER_ON
68    Stack_check_Initialize();
69#endif
70
71}
72
73int bsp_start(
74  int argc,
75  char **argv,
76  char **environp
77)
78{
79  /*
80   *  FORCE documentation incorrectly states that the bus request
81   *  level is initialized to 3.  It is actually initialized by
82   *  FORCEbug to 0.
83   */
84
85  outport_byte( 0x00, 0x3f );      /* resets VMEbus request level */
86
87  /*
88   *  we do not use the pretasking_hook.
89   */
90
91  Cpu_table.pretasking_hook = NULL;
92
93  Cpu_table.predriver_hook = bsp_libc_init;  /* RTEMS resources available */
94
95  Cpu_table.postdriver_hook = NULL;   /* Call our main() for constructors */
96
97  Cpu_table.idle_task = NULL;  /* do not override system IDLE task */
98
99  Cpu_table.do_zero_of_workspace = TRUE;
100
101  Cpu_table.interrupt_table_segment = get_ds();
102
103  Cpu_table.interrupt_table_offset = (void *)Interrupt_descriptor_table;
104
105  Cpu_table.interrupt_stack_size = 4096;
106
107  Cpu_table.extra_system_initialization_stack = 0;
108
109  /*
110   *  Copy the table
111   */
112
113  BSP_Configuration = Configuration;
114
115  BSP_Configuration.work_space_start = (void *)
116     RAM_END - BSP_Configuration.work_space_size;
117
118  /*
119   * Add 1 region for Malloc in libc_low
120   */
121
122  BSP_Configuration.maximum_regions++;
123
124  /*
125   * Add 1 extension for newlib libc
126   */
127
128#ifdef RTEMS_NEWLIB
129    BSP_Configuration.maximum_extensions++;
130#endif
131
132  /*
133   * Add another extension if using the stack checker
134   */
135
136#ifdef STACK_CHECKER_ON
137    BSP_Configuration.maximum_extensions++;
138#endif
139
140  rtems_initialize_executive( &BSP_Configuration, &Cpu_table );
141  /* does not return */
142  /* no cleanup necessary for Force CPU-386 */
143  return 0;
144}
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