source: rtems/c/src/lib/libbsp/i386/pc386/startup/bspstart.c @ eff217e

4.104.114.84.9
Last change on this file since eff217e was eff217e, checked in by Joel Sherrill <joel.sherrill@…>, on Sep 10, 1998 at 12:16:39 PM

Patch from Emmanuel Raguet <raguet@…>:

After some good comments from Eric Norum [thanks, Eric !],
I have added some modifications to my previous driver patch :

  • wait for transmitter ready before sending a packet,
  • new delay management in case of ring-overwritting.
  • Property mode set to 100644
File size: 7.5 KB
Line 
1/*-------------------------------------------------------------------------+
2| bspstart.c v1.1 - PC386 BSP - 1997/08/07
3+--------------------------------------------------------------------------+
4| This file contains the PC386 BSP startup package. It includes application,
5| board, and monitor specific initialization and configuration. The generic CPU
6| dependent initialization has been performed before this routine is invoked.
7+--------------------------------------------------------------------------+
8| (C) Copyright 1997 -
9| - NavIST Group - Real-Time Distributed Systems and Industrial Automation
10|
11| http://pandora.ist.utl.pt
12|
13| Instituto Superior Tecnico * Lisboa * PORTUGAL
14+--------------------------------------------------------------------------+
15| Disclaimer:
16|
17| This file is provided "AS IS" without warranty of any kind, either
18| expressed or implied.
19+--------------------------------------------------------------------------+
20| This code is based on:
21|   bspstart.c,v 1.8 1996/05/28 13:12:40 joel Exp - go32 BSP
22| With the following copyright notice:
23| **************************************************************************
24| *  COPYRIGHT (c) 1989-1998.
25| *  On-Line Applications Research Corporation (OAR).
26| *  Copyright assigned to U.S. Government, 1994.
27| *
28| *  The license and distribution terms for this file may be
29| *  found in found in the file LICENSE in this distribution or at
30| *  http://www.OARcorp.com/rtems/license.html.
31| **************************************************************************
32|
33|  $Id$
34+--------------------------------------------------------------------------*/
35
36
37#include <bsp.h>
38#include <libcsupport.h>
39#include <rtems/libio.h>
40#include <libcpu/cpuModel.h>
41
42/*-------------------------------------------------------------------------+
43| Global Variables
44+--------------------------------------------------------------------------*/
45extern rtems_unsigned32 _end;         /* End of BSS. Defined in 'linkcmds'. */
46
47/*
48 * Size of heap if it is 0 it will be dynamically defined by memory size,
49 * otherwise the value should be changed by binary patch
50 */
51rtems_unsigned32 _heap_size = 0; 
52
53/* Size of stack used during initialization. Defined in 'start.s'.  */
54extern rtems_unsigned32 _stack_size;
55
56rtems_unsigned32 rtemsFreeMemStart;
57                         /* Address of start of free memory - should be updated
58                            after creating new partitions or regions.         */
59
60/* The original BSP configuration table from the application and our copy of it
61   with some changes. */
62
63extern rtems_configuration_table  Configuration;
64       rtems_configuration_table  BSP_Configuration;
65
66rtems_cpu_table Cpu_table;                     /* CPU configuration table.    */
67char            *rtems_progname;               /* Program name - from main(). */
68
69extern void debugPollingGetChar();
70
71/*-------------------------------------------------------------------------+
72| External Prototypes
73+--------------------------------------------------------------------------*/
74extern void _exit(int);  /* define in exit.c */
75void bsp_libc_init( void *, unsigned32, int );
76void bsp_postdriver_hook(void);
77extern void rtems_irq_mngt_init();
78
79/*-------------------------------------------------------------------------+
80|         Function: bsp_pretasking_hook
81|      Description: BSP pretasking hook.  Called just before drivers are
82|                   initialized. Used to setup libc and install any BSP
83|                   extensions. NOTE: Must not use libc (to do io) from here,
84|                   since drivers are not yet initialized.
85| Global Variables: None.
86|        Arguments: None.
87|          Returns: Nothing.
88+--------------------------------------------------------------------------*/
89void bsp_pretasking_hook(void)
90{
91  rtems_unsigned32 topAddr, val;
92  int i;
93 
94 
95  if (rtemsFreeMemStart & (CPU_ALIGNMENT - 1))  /* not aligned => align it */
96    rtemsFreeMemStart = (rtemsFreeMemStart+CPU_ALIGNMENT) & ~(CPU_ALIGNMENT-1);
97
98  if(_heap_size == 0)
99    {
100      /*
101       * We have to dynamically size memory. Memory size can be anything
102       * between 2M and 2048M.
103       * let us first write
104       */
105      for(i=2048; i>=2; i--)
106        {
107          topAddr = i*1024*1024 - 4;
108          *(volatile rtems_unsigned32 *)topAddr = topAddr;
109        }
110
111      printk("\n");
112
113      for(i=2; i<=2048; i++)
114        {
115          topAddr = i*1024*1024 - 4;
116          val =  *(rtems_unsigned32 *)topAddr;
117          if(val != topAddr)
118            {
119              break;
120            }
121        }
122     
123      topAddr = (i-1)*1024*1024 - 4;
124
125      _heap_size = topAddr - rtemsFreeMemStart;
126    }
127     
128  bsp_libc_init((void *)rtemsFreeMemStart, _heap_size, 0);
129  rtemsFreeMemStart += _heap_size;           /* HEAP_SIZE  in KBytes */
130
131
132#ifdef RTEMS_DEBUG
133
134  rtems_debug_enable(RTEMS_DEBUG_ALL_MASK);
135
136#endif /* RTEMS_DEBUG */
137} /* bsp_pretasking_hook */
138 
139
140/*-------------------------------------------------------------------------+
141|         Function: bsp_start
142|      Description: Called before main is invoked.
143| Global Variables: None.
144|        Arguments: None.
145|          Returns: Nothing.
146+--------------------------------------------------------------------------*/
147void bsp_start( void )
148{
149
150  /*
151   * Calibrate variable for 1ms-loop (see timer.c)
152   */
153  Calibrate_loop_1ms();
154
155  rtemsFreeMemStart = (rtems_unsigned32)&_end + _stack_size;
156                                    /* set the value of start of free memory. */
157
158  /* If we don't have command line arguments set default program name. */
159
160  Cpu_table.pretasking_hook         = bsp_pretasking_hook; /* init libc, etc. */
161  Cpu_table.predriver_hook          = NULL;                /* use system's    */
162  Cpu_table.postdriver_hook         = bsp_postdriver_hook;
163  Cpu_table.idle_task               = NULL;
164                                          /* do not override system IDLE task */
165  Cpu_table.do_zero_of_workspace    = TRUE;
166  Cpu_table.interrupt_table_segment = get_ds();
167  Cpu_table.interrupt_table_offset  = (void *)Interrupt_descriptor_table;
168  Cpu_table.interrupt_stack_size    = 4096;
169  Cpu_table.extra_mpci_receive_server_stack = 0;
170
171  /* Place RTEMS workspace at beginning of free memory. */
172
173  if (rtemsFreeMemStart & (CPU_ALIGNMENT - 1))  /* not aligned => align it */
174    rtemsFreeMemStart = (rtemsFreeMemStart+CPU_ALIGNMENT) & ~(CPU_ALIGNMENT-1);
175
176  BSP_Configuration.work_space_start = (void *)rtemsFreeMemStart;
177  rtemsFreeMemStart += BSP_Configuration.work_space_size;
178
179  console_reserve_resources(&BSP_Configuration);
180
181  /*
182   * Init rtems interrupt management
183   */
184  rtems_irq_mngt_init();
185  /*
186   * Init rtems exceptions management
187   */
188  rtems_exception_init_mngt();
189  /*
190   *  The following information is very useful when debugging.
191   */
192
193#if 0
194  printk( "work_space_size = 0x%x\n", BSP_Configuration.work_space_size );
195  printk( "maximum_extensions = 0x%x\n", BSP_Configuration.maximum_extensions );
196  printk( "microseconds_per_tick = 0x%x\n",
197     BSP_Configuration.microseconds_per_tick );
198  printk( "ticks_per_timeslice = 0x%x\n",
199     BSP_Configuration.ticks_per_timeslice );
200  printk( "maximum_devices = 0x%x\n", BSP_Configuration.maximum_devices );
201  printk( "number_of_device_drivers = 0x%x\n",
202     BSP_Configuration.number_of_device_drivers );
203  printk( "Device_driver_table = 0x%x\n",
204     BSP_Configuration.Device_driver_table );
205
206  printk( "_heap_size = 0x%x\n", _heap_size );
207  printk( "_stack_size = 0x%x\n", _stack_size );
208  printk( "rtemsFreeMemStart = 0x%x\n", rtemsFreeMemStart );
209  printk( "work_space_start = 0x%x\n", BSP_Configuration.work_space_start );
210  printk( "work_space_size = 0x%x\n", BSP_Configuration.work_space_size );
211#endif
212} /* bsp_start */
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