osfmk/i386/AT386/himem.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_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
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*
  31  * @OSF_FREE_COPYRIGHT@
  32  */
  33 /*
  34  * HISTORY
  35  *
  36  * Revision 1.1.1.1  1998/09/22 21:05:38  wsanchez
  37  * Import of Mac OS X kernel (~semeria)
  38  *
  39  * Revision 1.1.1.1  1998/03/07 02:25:39  wsanchez
  40  * Import of OSF Mach kernel (~mburg)
  41  *
  42  * Revision 1.3.11.4  1995/12/15  10:49:49  bernadat
  43  *      cbus includes moved to busses/cbus
  44  *      [95/12/15            bernadat]
  45  *
  46  * Revision 1.3.11.3  1995/08/21  20:33:23  devrcs
  47  *      ri-osc CR1547:  Fix himem buffer translation to cope with non
  48  *      page-aligned addresses.
  49  *      [1995/08/08  16:52:06  bolinger]
  50  *
  51  * Revision 1.3.11.2  1995/01/26  22:14:56  ezf
  52  *      removed extraneous CMU CR
  53  *      [1995/01/26  20:24:48  ezf]
  54  *
  55  * Revision 1.3.9.2  1994/06/08  21:14:27  dswartz
  56  *      Preemption merge.
  57  *      [1994/06/08  21:12:31  dswartz]
  58  *
  59  * Revision 1.3.9.1  1994/05/19  20:30:30  dwm
  60  *      mk6 CR 80.  Add himem_init prototype.
  61  *      [1994/05/19  20:30:10  dwm]
  62  *
  63  * Revision 1.3.2.3  1993/08/09  19:37:21  dswartz
  64  *      Add ANSI prototypes - CR#9523
  65  *      [1993/08/06  17:50:06  dswartz]
  66  *
  67  * Revision 1.3.2.2  1993/06/09  02:25:24  gm
  68  *      CR9176 - ANSI C violations: trailing tokens on CPP
  69  *      directives, extra semicolons after decl_ ..., asm keywords
  70  *      [1993/06/07  18:58:40  jeffc]
  71  *
  72  *      Added to OSF/1 R1.3 from NMK15.0.
  73  *      [1993/06/02  21:01:57  jeffc]
  74  *
  75  * Revision 1.3  1993/04/19  16:09:54  devrcs
  76  *      Use free copyright
  77  *      [1993/03/03  12:12:12  bernadat]
  78  *
  79  * Revision 1.2  1992/11/25  01:07:16  robert
  80  *      integrate changes below for norma_14
  81  *      [1992/11/13  19:28:57  robert]
  82  *
  83  * $EndLog$
  84  */
  85
  86 #ifndef _I386AT_HIMEM_H_
  87 #define _I386AT_HIMEM_H_
  88
  89 /*
  90  * support of memory above 16 Megs for DMA limited to memory
  91  * below 16 Megs.
  92  */
  93
  94 #include <platforms.h>
  95
  96 #define HIMEM_STATS 0
  97
  98 #if     HIMEM_STATS
  99 extern int himem_request;
 100 extern int himem_used;
 101 #endif  /* HIMEM_STATS */
 102
 103 struct himem_link {
 104         struct himem_link *next;
 105         vm_offset_t     high_addr;      /* physical address */
 106         vm_offset_t     low_page;       /* physical page */
 107         vm_offset_t offset;             /* offset on page */
 108         vm_size_t       length;
 109 };
 110
 111 typedef struct himem_link *hil_t;
 112
 113
 114 #define HIGH_MEM                ((vm_offset_t) 0xf00000)
 115
 116 #define _high_mem_page(x)       ((vm_offset_t)(x) >= HIGH_MEM)
 117
 118
 119 #if     HIMEM_STATS
 120 #define high_mem_page(x) \
 121         (++himem_request && _high_mem_page(x) && ++himem_used)
 122
 123 #else   /* HIMEM_STATS */
 124 #define high_mem_page(x)        _high_mem_page(x)
 125 #endif  /* HIMEM_STATS */
 126
 127 extern void             himem_init(void);
 128 extern void             himem_reserve(
 129                                 int             npages);
 130 extern vm_offset_t      himem_convert(
 131                                 vm_offset_t     paddr,
 132                                 vm_size_t       len,
 133                                 int             op,
 134                                 hil_t           * hil);
 135 extern void             himem_revert(
 136                                 hil_t           hil);
 137
 138 #endif /* _I386AT_HIMEM_H_ */