osfmk/i386/AT386/himem.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_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. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * @OSF_FREE_COPYRIGHT@
  30  */
  31 /*
  32  * HISTORY
  33  *
  34  * Revision 1.1.1.1  1998/09/22 21:05:38  wsanchez
  35  * Import of Mac OS X kernel (~semeria)
  36  *
  37  * Revision 1.1.1.1  1998/03/07 02:25:39  wsanchez
  38  * Import of OSF Mach kernel (~mburg)
  39  *
  40  * Revision 1.3.11.4  1995/12/15  10:49:49  bernadat
  41  *      cbus includes moved to busses/cbus
  42  *      [95/12/15            bernadat]
  43  *
  44  * Revision 1.3.11.3  1995/08/21  20:33:23  devrcs
  45  *      ri-osc CR1547:  Fix himem buffer translation to cope with non
  46  *      page-aligned addresses.
  47  *      [1995/08/08  16:52:06  bolinger]
  48  *
  49  * Revision 1.3.11.2  1995/01/26  22:14:56  ezf
  50  *      removed extraneous CMU CR
  51  *      [1995/01/26  20:24:48  ezf]
  52  *
  53  * Revision 1.3.9.2  1994/06/08  21:14:27  dswartz
  54  *      Preemption merge.
  55  *      [1994/06/08  21:12:31  dswartz]
  56  *
  57  * Revision 1.3.9.1  1994/05/19  20:30:30  dwm
  58  *      mk6 CR 80.  Add himem_init prototype.
  59  *      [1994/05/19  20:30:10  dwm]
  60  *
  61  * Revision 1.3.2.3  1993/08/09  19:37:21  dswartz
  62  *      Add ANSI prototypes - CR#9523
  63  *      [1993/08/06  17:50:06  dswartz]
  64  *
  65  * Revision 1.3.2.2  1993/06/09  02:25:24  gm
  66  *      CR9176 - ANSI C violations: trailing tokens on CPP
  67  *      directives, extra semicolons after decl_ ..., asm keywords
  68  *      [1993/06/07  18:58:40  jeffc]
  69  *
  70  *      Added to OSF/1 R1.3 from NMK15.0.
  71  *      [1993/06/02  21:01:57  jeffc]
  72  *
  73  * Revision 1.3  1993/04/19  16:09:54  devrcs
  74  *      Use free copyright
  75  *      [1993/03/03  12:12:12  bernadat]
  76  *
  77  * Revision 1.2  1992/11/25  01:07:16  robert
  78  *      integrate changes below for norma_14
  79  *      [1992/11/13  19:28:57  robert]
  80  *
  81  * $EndLog$
  82  */
  83
  84 #ifndef _I386AT_HIMEM_H_
  85 #define _I386AT_HIMEM_H_
  86
  87 /*
  88  * support of memory above 16 Megs for DMA limited to memory
  89  * below 16 Megs.
  90  */
  91
  92 #include <platforms.h>
  93
  94 #define HIMEM_STATS 0
  95
  96 #if     HIMEM_STATS
  97 extern int himem_request;
  98 extern int himem_used;
  99 #endif  /* HIMEM_STATS */
 100
 101 struct himem_link {
 102         struct himem_link *next;
 103         vm_offset_t     high_addr;      /* physical address */
 104         vm_offset_t     low_page;       /* physical page */
 105         vm_offset_t offset;             /* offset on page */
 106         vm_size_t       length;
 107 };
 108
 109 typedef struct himem_link *hil_t;
 110
 111
 112 #define HIGH_MEM                ((vm_offset_t) 0xf00000)
 113
 114 #define _high_mem_page(x)       ((vm_offset_t)(x) >= HIGH_MEM)
 115
 116
 117 #if     HIMEM_STATS
 118 #define high_mem_page(x) \
 119         (++himem_request && _high_mem_page(x) && ++himem_used)
 120
 121 #else   /* HIMEM_STATS */
 122 #define high_mem_page(x)        _high_mem_page(x)
 123 #endif  /* HIMEM_STATS */
 124
 125 extern void             himem_init(void);
 126 extern void             himem_reserve(
 127                                 int             npages);
 128 extern vm_offset_t      himem_convert(
 129                                 vm_offset_t     paddr,
 130                                 vm_size_t       len,
 131                                 int             op,
 132                                 hil_t           * hil);
 133 extern void             himem_revert(
 134                                 hil_t           hil);
 135
 136 #endif /* _I386AT_HIMEM_H_ */