source: rtems/cpukit/rtems/src/dpmemcreate.c @ aefc109

4.104.114.84.95
Last change on this file since aefc109 was 08311cc3, checked in by Joel Sherrill <joel.sherrill@…>, on 11/17/99 at 17:51:34

Updated copyright notice.

  • Property mode set to 100644
File size: 1.9 KB
Line 
1/*
2 *  Dual Port Memory Manager
3 *
4 *  COPYRIGHT (c) 1989-1999.
5 *  On-Line Applications Research Corporation (OAR).
6 *
7 *  The license and distribution terms for this file may be
8 *  found in the file LICENSE in this distribution or at
9 *  http://www.OARcorp.com/rtems/license.html.
10 *
11 *  $Id$
12 */
13
14#include <rtems/system.h>
15#include <rtems/rtems/status.h>
16#include <rtems/rtems/support.h>
17#include <rtems/score/address.h>
18#include <rtems/rtems/dpmem.h>
19#include <rtems/score/object.h>
20#include <rtems/score/thread.h>
21#include <rtems/rtems/dpmem.h>
22
23/*PAGE
24 *
25 *  rtems_port_create
26 *
27 *  This directive creates a port into a dual-ported memory area.
28 *
29 *  Input parameters:
30 *    name           - user defined port name
31 *    internal_start - internal start address of port
32 *    external_start - external start address of port
33 *    length         - physical length in bytes
34 *    id             - address of port id to set
35 *
36 *  Output parameters:
37 *    id       - port id
38 *    RTEMS_SUCCESSFUL - if successful
39 *    error code - if unsuccessful
40 */
41
42rtems_status_code rtems_port_create(
43  rtems_name    name,
44  void         *internal_start,
45  void         *external_start,
46  unsigned32    length,
47  Objects_Id   *id
48)
49{
50  register Dual_ported_memory_Control *the_port;
51
52  if ( !rtems_is_name_valid( name) )
53    return RTEMS_INVALID_NAME;
54
55  if ( !_Addresses_Is_aligned( internal_start ) ||
56       !_Addresses_Is_aligned( external_start ) )
57    return RTEMS_INVALID_ADDRESS;
58
59  _Thread_Disable_dispatch();             /* to prevent deletion */
60
61  the_port = _Dual_ported_memory_Allocate();
62
63  if ( !the_port ) {
64    _Thread_Enable_dispatch();
65    return RTEMS_TOO_MANY;
66  }
67
68  the_port->internal_base = internal_start;
69  the_port->external_base = external_start;
70  the_port->length        = length - 1;
71
72  _Objects_Open(
73    &_Dual_ported_memory_Information,
74    &the_port->Object,
75    &name
76  );
77
78  *id = the_port->Object.id;
79  _Thread_Enable_dispatch();
80  return RTEMS_SUCCESSFUL;
81}
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