2005-11-03 <strauman@slac.stanford.edu>

	* shared/startup/pretaskinghook.c, shared/startup/zerobss.c: New files.
	* Makefile.am, shared/startup/bspstart.c: Split
	pretaskinghook and zerobss into separate, reusable files; Fixed
	#PR837 (set exception in ram flag before initializing exceptions);
	Setup DBATs early, they are needed to access peripherals (Allows
	mvme2100 to use MMU); moved VME initialization into pretasking hook
	so that shared interrupts can be used for VME [shared IRQ facility
	needs functional workspace].

1 files changed, 28 insertions, 0 deletions

diff --git a/c/src/lib/libbsp/powerpc/shared/startup/zerobss.c b/c/src/lib/libbsp/powerpc/shared/startup/zerobss.c
new file mode 100644
index 0000000000..d1c62384f2
--- /dev/null
+++ b/c/src/lib/libbsp/powerpc/shared/startup/zerobss.c
@@ -0,0 +1,28 @@
+/*
+ *  zero the various bss areas.
+ *
+ *  COPYRIGHT (c) 1989-1998.
+ *  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.rtems.com/license/LICENSE.
+ *
+ *  Modified to support the MCP750.
+ *  Modifications Copyright (C) 1999 Eric Valette. valette@crf.canon.fr
+ *
+ *  $Id$
+ */
+
+#include <string.h>
+
+void zero_bss()
+{
+  /* prevent these from being accessed in the short data areas */
+  extern unsigned long __bss_start[], __SBSS_START__[], __SBSS_END__[];
+  extern unsigned long __SBSS2_START__[], __SBSS2_END__[];
+  extern unsigned long __rtems_end[];
+  memset(__SBSS_START__, 0, ((unsigned) __SBSS_END__) - ((unsigned)__SBSS_START__));
+  memset(__SBSS2_START__, 0, ((unsigned) __SBSS2_END__) - ((unsigned)__SBSS2_START__));
+  memset(__bss_start, 0, ((unsigned) __rtems_end) - ((unsigned)__bss_start));
+}