usr/src/psm/promif/ieee1275/sun4/prom_map.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 1991-1994, by Sun Microsystems, Inc.
  24  * All rights reserved.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include <sys/promif.h>
  30 #include <sys/promimpl.h>
  31
  32 /*
  33  * Mapping routines suitable for implementations using 2-cell physical
  34  * address formats.  Use of these routines makes the caller
  35  * platform-dependent.  The implementation of these routines is
  36  * a bit sun-hardware centric, for historical use by SunOS and standalones.
  37  */
  38
  39 caddr_t
  40 prom_map(caddr_t virthint, unsigned long long physaddr, u_int size)
  41 {
  42         caddr_t virt;
  43
  44         /*
  45          * If no virthint, allocate it; otherwise claim it,
  46          * the physical address is assumed to be a device or
  47          * already claimed, or not appearing in a resource list.
  48          */
  49         if (virthint == (caddr_t)0)  {
  50                 if ((virt = prom_allocate_virt((u_int)1, size)) == 0)
  51                         return ((caddr_t)0);
  52         } else {
  53                 virt = virthint;
  54                 if (prom_claim_virt(size, virt) != virt)
  55                         return ((caddr_t)0);
  56         }
  57
  58         if (prom_map_phys(-1, size, virt, physaddr) != 0) {
  59                 /*
  60                  * The map operation failed, free the virtual
  61                  * addresses we allocated or claimed.
  62                  */
  63                 (void) prom_free_virt(size, virt);
  64                 return ((caddr_t)0);
  65         }
  66         return (virt);
  67 }
  68
  69 void
  70 prom_unmap(caddr_t virt, u_int size)
  71 {
  72         (void) prom_unmap_virt(size, virt);
  73         prom_free_virt(size, virt);
  74 }