source: rtems/cpukit/rtems/src/dpmemexternal2internal.c @ 66cb142

5
Last change on this file since 66cb142 was 9c3bae11, checked in by Sebastian Huber <sebastian.huber@…>, on Apr 21, 2016 at 5:52:19 AM

rtems: Avoid Giant lock for dual ported memory

There is no need for an ISR lock since the Dual_ported_memory_Control is
immutable after initialization. ISR disable is enough for deletion
safety on uni-processor configurations.

Update #2555.

  • Property mode set to 100644
File size: 1.2 KB
Line 
1/**
2 *  @file
3 *
4 *  @brief RTEMS Port External to Internal
5 *  @ingroup ClassicDPMEM
6 */
7
8/*
9 *  COPYRIGHT (c) 1989-2014.
10 *  On-Line Applications Research Corporation (OAR).
11 *
12 *  The license and distribution terms for this file may be
13 *  found in the file LICENSE in this distribution or at
14 *  http://www.rtems.org/license/LICENSE.
15 */
16
17#if HAVE_CONFIG_H
18#include "config.h"
19#endif
20
21#include <rtems/rtems/dpmemimpl.h>
22#include <rtems/score/address.h>
23
24rtems_status_code rtems_port_external_to_internal(
25  rtems_id   id,
26  void      *external,
27  void     **internal
28)
29{
30  Dual_ported_memory_Control *the_port;
31  ISR_lock_Context            lock_context;
32  uint32_t                    ending;
33
34  if ( internal == NULL ) {
35    return RTEMS_INVALID_ADDRESS;
36  }
37
38  the_port = _Dual_ported_memory_Get( id, &lock_context );
39
40  if ( the_port == NULL ) {
41    return RTEMS_INVALID_ID;
42  }
43
44  ending = _Addresses_Subtract( external, the_port->external_base );
45
46  if ( ending > the_port->length ) {
47    *internal = external;
48  } else {
49    *internal = _Addresses_Add_offset( the_port->internal_base, ending );
50  }
51
52  _ISR_lock_ISR_enable( &lock_context );
53  return RTEMS_SUCCESSFUL;
54}
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