2002-03-28 Ralf Corsepius <corsepiu@faw.uni-ulm.de>

	* tbr/Makefile.am: New file.
	* tbr/.cvsignore: New file.
	* tbr/tbr.c: New file.
	* tbr/tbr.h: New file.
	* configure.ac: Add tbr subdir.
	* Makefile.am: Add tbr subdir.

1 files changed, 50 insertions, 0 deletions

diff --git a/c/src/lib/libcpu/sparc/tbr/tbr.c b/c/src/lib/libcpu/sparc/tbr/tbr.c
new file mode 100644
index 0000000000..7106c58db2
--- /dev/null
+++ b/c/src/lib/libcpu/sparc/tbr/tbr.c
@@ -0,0 +1,50 @@
+/*
+ *  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
+}