osfmk/i386/AT386/himem.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * @OSF_FREE_COPYRIGHT@
  24  */
  25 /*
  26  * HISTORY
  27  *
  28  * Revision 1.1.1.1  1998/09/22 21:05:38  wsanchez
  29  * Import of Mac OS X kernel (~semeria)
  30  *
  31  * Revision 1.1.1.1  1998/03/07 02:25:39  wsanchez
  32  * Import of OSF Mach kernel (~mburg)
  33  *
  34  * Revision 1.3.11.4  1995/12/15  10:49:49  bernadat
  35  *      cbus includes moved to busses/cbus
  36  *      [95/12/15            bernadat]
  37  *
  38  * Revision 1.3.11.3  1995/08/21  20:33:23  devrcs
  39  *      ri-osc CR1547:  Fix himem buffer translation to cope with non
  40  *      page-aligned addresses.
  41  *      [1995/08/08  16:52:06  bolinger]
  42  *
  43  * Revision 1.3.11.2  1995/01/26  22:14:56  ezf
  44  *      removed extraneous CMU CR
  45  *      [1995/01/26  20:24:48  ezf]
  46  *
  47  * Revision 1.3.9.2  1994/06/08  21:14:27  dswartz
  48  *      Preemption merge.
  49  *      [1994/06/08  21:12:31  dswartz]
  50  *
  51  * Revision 1.3.9.1  1994/05/19  20:30:30  dwm
  52  *      mk6 CR 80.  Add himem_init prototype.
  53  *      [1994/05/19  20:30:10  dwm]
  54  *
  55  * Revision 1.3.2.3  1993/08/09  19:37:21  dswartz
  56  *      Add ANSI prototypes - CR#9523
  57  *      [1993/08/06  17:50:06  dswartz]
  58  *
  59  * Revision 1.3.2.2  1993/06/09  02:25:24  gm
  60  *      CR9176 - ANSI C violations: trailing tokens on CPP
  61  *      directives, extra semicolons after decl_ ..., asm keywords
  62  *      [1993/06/07  18:58:40  jeffc]
  63  *
  64  *      Added to OSF/1 R1.3 from NMK15.0.
  65  *      [1993/06/02  21:01:57  jeffc]
  66  *
  67  * Revision 1.3  1993/04/19  16:09:54  devrcs
  68  *      Use free copyright
  69  *      [1993/03/03  12:12:12  bernadat]
  70  *
  71  * Revision 1.2  1992/11/25  01:07:16  robert
  72  *      integrate changes below for norma_14
  73  *      [1992/11/13  19:28:57  robert]
  74  *
  75  * $EndLog$
  76  */
  77
  78 #ifndef _I386AT_HIMEM_H_
  79 #define _I386AT_HIMEM_H_
  80
  81 /*
  82  * support of memory above 16 Megs for DMA limited to memory
  83  * below 16 Megs.
  84  */
  85
  86 #include <platforms.h>
  87
  88 #define HIMEM_STATS 0
  89
  90 #if     HIMEM_STATS
  91 extern int himem_request;
  92 extern int himem_used;
  93 #endif  /* HIMEM_STATS */
  94
  95 struct himem_link {
  96         struct himem_link *next;
  97         vm_offset_t     high_addr;      /* physical address */
  98         vm_offset_t     low_page;       /* physical page */
  99         vm_offset_t offset;             /* offset on page */
 100         vm_size_t       length;
 101 };
 102
 103 typedef struct himem_link *hil_t;
 104
 105
 106 #define HIGH_MEM                ((vm_offset_t) 0xf00000)
 107
 108 #define _high_mem_page(x)       ((vm_offset_t)(x) >= HIGH_MEM)
 109
 110
 111 #if     HIMEM_STATS
 112 #define high_mem_page(x) \
 113         (++himem_request && _high_mem_page(x) && ++himem_used)
 114
 115 #else   /* HIMEM_STATS */
 116 #define high_mem_page(x)        _high_mem_page(x)
 117 #endif  /* HIMEM_STATS */
 118
 119 extern void             himem_init(void);
 120 extern void             himem_reserve(
 121                                 int             npages);
 122 extern vm_offset_t      himem_convert(
 123                                 vm_offset_t     paddr,
 124                                 vm_size_t       len,
 125                                 int             op,
 126                                 hil_t           * hil);
 127 extern void             himem_revert(
 128                                 hil_t           hil);
 129
 130 #endif /* _I386AT_HIMEM_H_ */