Subversion Repositories openrisc_2011-10-31

/*  
 *  This routine is an implementation of the bsp_pretasking_hook
 *  that can be used by all m68k BSPs following linkcmds conventions
 *  regarding heap, stack, and workspace allocation.
 *
 *  COPYRIGHT (c) 1989-1999.
 *  On-Line Applications Research Corporation (OAR).
 *
 *  The license and distribution terms for this file may be
 *  found in the file LICENSE in this distribution or at
 *  http://www.OARcorp.com/rtems/license.html.
 *
 *  $Id: m68kpretaskinghook.c,v 1.2 2001-09-27 12:00:24 chris Exp $
 */
 
#include <rtems.h>
#include <bsp.h>
#include <libcsupport.h>
 
/*
 *  Function:   bsp_pretasking_hook
 *  Created:    95/03/10
 *
 *  Description:
 *      BSP pretasking hook.  Called just before drivers are initialized.
 *      Used to setup libc and install any BSP extensions.
 *
 *  NOTES:
 *      Must not use libc (to do io) from here, since drivers are
 *      not yet initialized.
 *
 */
 
extern void bsp_libc_init( void *, unsigned long, int );
extern rtems_configuration_table  BSP_Configuration;
 
extern void          *_RamBase;
extern void          *_WorkspaceBase;
extern void          *_HeapSize;
 
 
unsigned long  _M68k_Ramsize;
 
void bsp_pretasking_hook(void)
{
    void         *heapStart;
    unsigned long heapSize = (unsigned long)&_HeapSize;
    unsigned long ramSpace;
 
    heapStart =  (void *)
       ((unsigned long)&_WorkspaceBase + BSP_Configuration.work_space_size);
    ramSpace = (unsigned long) &_RamBase + _M68k_Ramsize - (unsigned long) heapStart;
 
    if (heapSize == 0)
        heapSize = ramSpace;
    else if (heapSize > ramSpace)
        rtems_fatal_error_occurred (('H'<<24) | ('E'<<16) | ('A'<<8) | 'P');
 
    bsp_libc_init(heapStart, heapSize, 0);
 
#ifdef RTEMS_DEBUG
    rtems_debug_enable( RTEMS_DEBUG_ALL_MASK );
#endif
 
}