osfmk/i386/AT386/himem.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * @OSF_FREE_COPYRIGHT@
  27  */
  28 /*
  29  * HISTORY
  30  *
  31  * Revision 1.1.1.1  1998/09/22 21:05:38  wsanchez
  32  * Import of Mac OS X kernel (~semeria)
  33  *
  34  * Revision 1.1.1.1  1998/03/07 02:25:39  wsanchez
  35  * Import of OSF Mach kernel (~mburg)
  36  *
  37  * Revision 1.3.11.4  1995/12/15  10:49:49  bernadat
  38  *      cbus includes moved to busses/cbus
  39  *      [95/12/15            bernadat]
  40  *
  41  * Revision 1.3.11.3  1995/08/21  20:33:23  devrcs
  42  *      ri-osc CR1547:  Fix himem buffer translation to cope with non
  43  *      page-aligned addresses.
  44  *      [1995/08/08  16:52:06  bolinger]
  45  *
  46  * Revision 1.3.11.2  1995/01/26  22:14:56  ezf
  47  *      removed extraneous CMU CR
  48  *      [1995/01/26  20:24:48  ezf]
  49  *
  50  * Revision 1.3.9.2  1994/06/08  21:14:27  dswartz
  51  *      Preemption merge.
  52  *      [1994/06/08  21:12:31  dswartz]
  53  *
  54  * Revision 1.3.9.1  1994/05/19  20:30:30  dwm
  55  *      mk6 CR 80.  Add himem_init prototype.
  56  *      [1994/05/19  20:30:10  dwm]
  57  *
  58  * Revision 1.3.2.3  1993/08/09  19:37:21  dswartz
  59  *      Add ANSI prototypes - CR#9523
  60  *      [1993/08/06  17:50:06  dswartz]
  61  *
  62  * Revision 1.3.2.2  1993/06/09  02:25:24  gm
  63  *      CR9176 - ANSI C violations: trailing tokens on CPP
  64  *      directives, extra semicolons after decl_ ..., asm keywords
  65  *      [1993/06/07  18:58:40  jeffc]
  66  *
  67  *      Added to OSF/1 R1.3 from NMK15.0.
  68  *      [1993/06/02  21:01:57  jeffc]
  69  *
  70  * Revision 1.3  1993/04/19  16:09:54  devrcs
  71  *      Use free copyright
  72  *      [1993/03/03  12:12:12  bernadat]
  73  *
  74  * Revision 1.2  1992/11/25  01:07:16  robert
  75  *      integrate changes below for norma_14
  76  *      [1992/11/13  19:28:57  robert]
  77  *
  78  * $EndLog$
  79  */
  80
  81 #ifndef _I386AT_HIMEM_H_
  82 #define _I386AT_HIMEM_H_
  83
  84 /*
  85  * support of memory above 16 Megs for DMA limited to memory
  86  * below 16 Megs.
  87  */
  88
  89 #include <platforms.h>
  90
  91 #define HIMEM_STATS 0
  92
  93 #if     HIMEM_STATS
  94 extern int himem_request;
  95 extern int himem_used;
  96 #endif  /* HIMEM_STATS */
  97
  98 struct himem_link {
  99         struct himem_link *next;
 100         vm_offset_t     high_addr;      /* physical address */
 101         vm_offset_t     low_page;       /* physical page */
 102         vm_offset_t offset;             /* offset on page */
 103         vm_size_t       length;
 104 };
 105
 106 typedef struct himem_link *hil_t;
 107
 108
 109 #define HIGH_MEM                ((vm_offset_t) 0xf00000)
 110
 111 #define _high_mem_page(x)       ((vm_offset_t)(x) >= HIGH_MEM)
 112
 113
 114 #if     HIMEM_STATS
 115 #define high_mem_page(x) \
 116         (++himem_request && _high_mem_page(x) && ++himem_used)
 117
 118 #else   /* HIMEM_STATS */
 119 #define high_mem_page(x)        _high_mem_page(x)
 120 #endif  /* HIMEM_STATS */
 121
 122 extern void             himem_init(void);
 123 extern void             himem_reserve(
 124                                 int             npages);
 125 extern vm_offset_t      himem_convert(
 126                                 vm_offset_t     paddr,
 127                                 vm_size_t       len,
 128                                 int             op,
 129                                 hil_t           * hil);
 130 extern void             himem_revert(
 131                                 hil_t           hil);
 132
 133 #endif /* _I386AT_HIMEM_H_ */