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  1. /*
  2.  * Copyright (C) 2005 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #ifndef __ia64_ASID_H__
  30. #define __ia64_ASID_H__
  31.  
  32. #include <arch/types.h>
  33.  
  34. typedef __u32 asid_t;
  35.  
  36. /**
  37.  * This macro eliminates the stealing branch of asid_get().
  38.  */
  39. #define ASID_STEALING_ENABLED   0
  40.  
  41. /** Number of ia64 RIDs (Region Identifiers) per kernel ASID. */
  42. #define RIDS_PER_ASID       7
  43. #define RID_OVERFLOW        16777216    /* 2^24 */
  44.  
  45. #define ASID2RID(asid, vrn) (((asid)*RIDS_PER_ASID)+(vrn))
  46. #define RID2ASID(rid)       ((rid)/RIDS_PER_ASID)
  47.  
  48. typedef __u32 rid_t;
  49.  
  50. /**
  51.  * This macro is needed only to compile the kernel.
  52.  * On ia64, its value is ignored.
  53.  */
  54. #define ASID_MAX_ARCH       0
  55.  
  56. /**
  57.  * Value used to recognize the situation when all ASIDs were already allocated.
  58.  */
  59. #define ASID_OVERFLOW       (RID_OVERFLOW/RIDS_PER_ASID)
  60.  
  61. /** On ia64, this is no-op. */
  62. #define asid_put_arch(x)
  63.  
  64. #endif
  65.