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.

c/src/lib/libcpu/sparc/ChangeLog

@@ -1,3 +1,12 @@
+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.
+
 2002-03-27	Ralf Corsepius <corsepiu@faw.uni-ulm.de>
 
 	* configure.ac:

c/src/lib/libcpu/sparc/Makefile.am

@@ -4,7 +4,7 @@
 
 ACLOCAL_AMFLAGS = -I ../../../../../aclocal
 
-SUBDIRS = include cache reg_win syscall
+SUBDIRS = include cache reg_win syscall tbr
 
 include $(top_srcdir)/../../../../../automake/subdirs.am
 include $(top_srcdir)/../../../../../automake/local.am

c/src/lib/libcpu/sparc/configure.ac

@@ -35,6 +35,7 @@ AC_CONFIG_FILES([Makefile
 cache/Makefile
 include/Makefile
 reg_win/Makefile
-syscall/Makefile])
+syscall/Makefile
+tbr/Makefile])
 AC_OUTPUT
 

c/src/lib/libcpu/sparc/tbr/.cvsignore

@@ -0,0 +1,2 @@
+Makefile
+Makefile.in

c/src/lib/libcpu/sparc/tbr/Makefile.am

@@ -0,0 +1,31 @@
+##
+## $Id$
+##
+
+C_FILES = tbr.c
+C_O_FILES = $(C_FILES:%.c=$(ARCH)/%.o)
+
+include_libcpudir = $(includedir)/libcpu
+
+include_libcpu_HEADERS = tbr.h
+
+OBJS = $(C_O_FILES)
+
+include $(RTEMS_ROOT)/make/custom/@RTEMS_BSP@.cfg
+include $(top_srcdir)/../../../../../automake/compile.am
+include $(top_srcdir)/../../../../../automake/lib.am
+
+$(PROJECT_INCLUDE)/libcpu:
+	$(mkinstalldirs) $@
+
+$(PROJECT_INCLUDE)/libcpu/%.h: %.h
+	$(INSTALL_DATA) $< $@
+
+PREINSTALL_FILES = $(PROJECT_INCLUDE)/libcpu \
+    $(include_libcpu_HEADERS:%=$(PROJECT_INCLUDE)/libcpu/%)
+
+all-local: $(ARCH) $(PREINSTALL_FILES) $(OBJS)
+
+EXTRA_DIST = tbr.c
+
+include $(top_srcdir)/../../../../../automake/local.am

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
+}

c/src/lib/libcpu/sparc/tbr/tbr.h

@@ -0,0 +1,40 @@
+/*
+ *  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.
+ *
+ *  $Id$
+ */
+
+/*
+ *  This is the executive's trap table which is installed into the TBR
+ *  register.
+ *
+ *  NOTE:  Unfortunately, this must be aligned on a 4096 byte boundary.
+ *         The GNU tools as of binutils 2.5.2 and gcc 2.7.0 would not
+ *         align an entity to anything greater than a 512 byte boundary.
+ *
+ *         Because of this, we pull a little bit of a trick.  We allocate
+ *         enough memory so we can grab an address on a 4096 byte boundary
+ *         from this area.
+ */
+
+#ifndef _libcpu_tbr_h
+#define _libcpu_tbr_h
+
+#include <bsp.h>
+
+#ifndef NO_TABLE_MOVE
+
+#define SPARC_TRAP_TABLE_ALIGNMENT 4096
+
+SCORE_EXTERN unsigned8 _CPU_Trap_Table_area[8192]
+  __attribute__ ((aligned (SPARC_TRAP_TABLE_ALIGNMENT)));
+#endif
+
+#endif