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1.1 root 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_ */
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