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/*
* SPARC Dependent Source
*
* 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.
*
* $Id$
*/
#include <libcpu/tbr.h>
void
sparc_init_tbr ()
{
#ifndef NO_TABLE_MOVE
unsigned32 trap_table_start;
unsigned32 tbr_value;
CPU_Trap_table_entry *old_tbr;
CPU_Trap_table_entry *trap_table;
/*
* Install the executive's trap table. All entries from the original
* trap table are copied into the executive's trap table. This is essential
* since this preserves critical trap handlers such as the window underflow
* and overflow handlers. It is the responsibility of the BSP to provide
* install these in the initial trap table.
*/
trap_table_start = (unsigned32) & _CPU_Trap_Table_area;
if (trap_table_start & (SPARC_TRAP_TABLE_ALIGNMENT - 1))
trap_table_start = (trap_table_start + SPARC_TRAP_TABLE_ALIGNMENT) &
~(SPARC_TRAP_TABLE_ALIGNMENT - 1);
trap_table = (CPU_Trap_table_entry *) trap_table_start;
sparc_get_tbr (tbr_value);
old_tbr = (CPU_Trap_table_entry *) (tbr_value & 0xfffff000);
memcpy (trap_table, (void *) old_tbr, 256 * sizeof (CPU_Trap_table_entry));
sparc_set_tbr (trap_table_start);
#endif
}
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