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|
/*-------------------------------------------------------------------------+
| bspstart.c v1.1 - PC386 BSP - 1997/08/07
+--------------------------------------------------------------------------+
| This file contains the PC386 BSP startup package. It includes application,
| board, and monitor specific initialization and configuration. The generic CPU
| dependent initialization has been performed before this routine is invoked.
+--------------------------------------------------------------------------+
| (C) Copyright 1997 -
| - NavIST Group - Real-Time Distributed Systems and Industrial Automation
|
| http://pandora.ist.utl.pt
|
| Instituto Superior Tecnico * Lisboa * PORTUGAL
+--------------------------------------------------------------------------+
| Disclaimer:
|
| This file is provided "AS IS" without warranty of any kind, either
| expressed or implied.
+--------------------------------------------------------------------------+
| This code is based on:
| bspstart.c,v 1.8 1996/05/28 13:12:40 joel Exp - go32 BSP
| With the following copyright notice:
| **************************************************************************
| * COPYRIGHT (c) 1989-1998.
| * On-Line Applications Research Corporation (OAR).
| * Copyright assigned to U.S. Government, 1994.
| *
| * 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 <bsp.h>
#include <libcsupport.h>
#include <rtems/libio.h>
#ifdef STACK_CHECKER_ON
#include <stackchk.h>
#endif
/*-------------------------------------------------------------------------+
| Global Variables
+--------------------------------------------------------------------------*/
#ifdef RTEMS_SMALL_MEMORY
extern rtems_unsigned32 _end; /* End of BSS. Defined in 'linkcmds'. */
rtems_unsigned32 rtemsFreeMemStart = (rtems_unsigned32)&_end;
/* Address of start of free memory - should be updated
after creating new partitions or regions. */
#else
rtems_unsigned32 rtemsFreeMemStart = RAM_START;
/* RAM_START defined in 'bsp.h'. */
#endif /* RTEMS_SMALL_MEMORY */
/* The original BSP configuration table from the application and our copy of it
with some changes. */
extern rtems_configuration_table Configuration;
rtems_configuration_table BSP_Configuration;
rtems_cpu_table Cpu_table; /* CPU configuration table. */
char *rtems_progname; /* Program name - from main(). */
/*-------------------------------------------------------------------------+
| External Prototypes
+--------------------------------------------------------------------------*/
extern void _exit(int); /* define in exit.c */
/*-------------------------------------------------------------------------+
| Function: bsp_libc_init
| Description: Initialize whatever libc we are using. Called from
| pretasking hook.
| Global Variables: rtemsFreeMemStart.
| Arguments: None.
| Returns: Nothing.
+--------------------------------------------------------------------------*/
static void
bsp_libc_init(void)
{
if (rtemsFreeMemStart & (CPU_ALIGNMENT - 1)) /* not aligned => align it */
rtemsFreeMemStart = (rtemsFreeMemStart+CPU_ALIGNMENT) & ~(CPU_ALIGNMENT-1);
RTEMS_Malloc_Initialize((void *)rtemsFreeMemStart, HEAP_SIZE << 10, 0);
rtemsFreeMemStart += HEAP_SIZE << 10; /* HEAP_SIZE is in KBytes */
/* Init the RTEMS libio facility to provide UNIX-like system calls for use by
newlib (ie: provide __rtems_open, __rtems_close, etc). Uses malloc()
to get area for the iops, so must be after malloc initialization. */
rtems_libio_init();
/* Set up for the libc handling. */
if (BSP_Configuration.ticks_per_timeslice > 0)
libc_init(1); /* reentrant if possible */
else
libc_init(0); /* non-reentrant */
} /* bsp_libc_init */
/*-------------------------------------------------------------------------+
| Function: bsp_pretasking_hook
| Description: BSP pretasking hook. Called just before drivers are
| initialized. Used to setup libc and install any BSP
| extensions. NOTE: Must not use libc (to do io) from here,
| since drivers are not yet initialized.
| Global Variables: None.
| Arguments: None.
| Returns: Nothing.
+--------------------------------------------------------------------------*/
void
bsp_pretasking_hook(void)
{
bsp_libc_init();
#ifdef STACK_CHECKER_ON
/* Initialize the stack bounds checker. We can either turn it on here or from
the app. */
Stack_check_Initialize();
#endif /* STACK_CHECKER_ON */
#ifdef RTEMS_DEBUG
rtems_debug_enable(RTEMS_DEBUG_ALL_MASK);
#endif /* RTEMS_DEBUG */
} /* bsp_pretasking_hook */
/*
* Use the shared bsp_postdriver_hook() implementation
*/
void bsp_postdriver_hook(void);
/*-------------------------------------------------------------------------+
| Function: bsp_start
| Description: Called before main is invoked.
| Global Variables: None.
| Arguments: None.
| Returns: Nothing.
+--------------------------------------------------------------------------*/
void bsp_start( void )
{
/* If we don't have command line arguments set default program name. */
Cpu_table.pretasking_hook = bsp_pretasking_hook; /* init libc, etc. */
Cpu_table.predriver_hook = NULL; /* use system's */
Cpu_table.postdriver_hook = bsp_postdriver_hook;
Cpu_table.idle_task = NULL;
/* do not override system IDLE task */
Cpu_table.do_zero_of_workspace = TRUE;
Cpu_table.interrupt_table_segment = get_ds();
Cpu_table.interrupt_table_offset = (void *)Interrupt_descriptor_table;
Cpu_table.interrupt_stack_size = 4096;
Cpu_table.extra_mpci_receive_server_stack = 0;
/* Copy user's table and make necessary adjustments. */
BSP_Configuration = Configuration;
/* Place RTEMS workspace at top of physical RAM (RAM_END defined in 'bsp.h' */
BSP_Configuration.work_space_start =
(void *)(RAM_END - BSP_Configuration.work_space_size);
/* Add 1 region for Malloc in libc_low. */
BSP_Configuration.RTEMS_api_configuration->maximum_regions++;
/* Add 1 extension for newlib libc. */
#ifdef RTEMS_NEWLIB
BSP_Configuration.maximum_extensions++;
#endif
/* Add another extension if using the stack checker. */
#ifdef STACK_CHECKER_ON
BSP_Configuration.maximum_extensions++;
#endif
/* Tell libio how many fd's we want and allow it to tweak config. */
rtems_libio_config(&BSP_Configuration, BSP_LIBIO_MAX_FDS);
#if 0
rtems_initialize_executive(&BSP_Configuration, &Cpu_table);
/* does not return */
/*-------------------------------------------------------------------------+
| We only return here if the executive has finished. This happens when the
| task has called exit(). We will then call _exit() which is part of the bsp.
+--------------------------------------------------------------------------*/
for (;;)
_exit(0);
/* no cleanup necessary for PC386 */
return 0;
#endif
} /* bsp_start */
|
