osfmk/i386/AT386/himem.h

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