From 1dc030fe0566d327c0c0f9ab0c4bfae89a961c9d Mon Sep 17 00:00:00 2001
From: Joel Sherrill <joel.sherrill@OARcorp.com>
Date: Mon, 17 May 1999 23:18:20 +0000
Subject: Dual-Ported Memory Manager split into one routine per file.

---
 cpukit/rtems/src/dpmeminternal2external.c | 73 +++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 cpukit/rtems/src/dpmeminternal2external.c

(limited to 'cpukit/rtems/src/dpmeminternal2external.c')

diff --git a/cpukit/rtems/src/dpmeminternal2external.c b/cpukit/rtems/src/dpmeminternal2external.c
new file mode 100644
index 0000000000..adfbf09933
--- /dev/null
+++ b/cpukit/rtems/src/dpmeminternal2external.c
@@ -0,0 +1,73 @@
+/*
+ *  Dual Port Memory Manager
+ *
+ *  COPYRIGHT (c) 1989-1998.
+ *  On-Line Applications Research Corporation (OAR).
+ *  Copyright assigned to U.S. Government, 1994.
+ *
+ *  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 <rtems/system.h>
+#include <rtems/rtems/status.h>
+#include <rtems/rtems/support.h>
+#include <rtems/score/address.h>
+#include <rtems/rtems/dpmem.h>
+#include <rtems/score/object.h>
+#include <rtems/score/thread.h>
+#include <rtems/rtems/dpmem.h>
+
+/*PAGE
+ *
+ *  rtems_port_internal_to_external
+ *
+ *  This directive converts an internal dual-ported memory address to an
+ *  external dual-ported memory address.  If the given internal address
+ *  is an invalid dual-ported address, then the external address is set
+ *  to the given internal address.
+ *
+ *  Input parameters:
+ *    id       - id of dual-ported memory object
+ *    internal - internal address to set
+ *    external - pointer to external address
+ *
+ *  Output parameters:
+ *    external          - external address
+ *    RTEMS_SUCCESSFUL - always succeeds
+ */
+
+rtems_status_code rtems_port_internal_to_external(
+  Objects_Id   id,
+  void        *internal,
+  void       **external
+)
+{
+  register Dual_ported_memory_Control *the_port;
+  Objects_Locations                    location;
+  unsigned32                           ending;
+
+  the_port = _Dual_ported_memory_Get( id, &location );
+  switch ( location ) {
+    case OBJECTS_REMOTE:        /* this error cannot be returned */
+      return RTEMS_INTERNAL_ERROR;
+
+    case OBJECTS_ERROR:
+      return RTEMS_INVALID_ID;
+
+    case OBJECTS_LOCAL:
+      ending = _Addresses_Subtract( internal, the_port->internal_base );
+      if ( ending > the_port->length )
+        *external = internal;
+      else
+        *external = _Addresses_Add_offset( the_port->external_base,
+                                           ending );
+      _Thread_Enable_dispatch();
+      return RTEMS_SUCCESSFUL;
+  }
+
+  return RTEMS_INTERNAL_ERROR;   /* unreached - only to remove warnings */
+}
-- 
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