1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1991 Regents of the University of California.
5 * All rights reserved.
6 *
7 * Copyright (c) 2018 The FreeBSD Foundation
8 * All rights reserved.
9 *
10 * This code is derived from software contributed to Berkeley by
11 * the Systems Programming Group of the University of Utah Computer
12 * Science Department and William Jolitz of UUNET Technologies Inc.
13 *
14 * Portions of this software were developed by
15 * Konstantin Belousov <kib@FreeBSD.org> under sponsorship from
16 * the FreeBSD Foundation.
17 *
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions
20 * are met:
21 * 1. Redistributions of source code must retain the above copyright
22 * notice, this list of conditions and the following disclaimer.
23 * 2. Redistributions in binary form must reproduce the above copyright
24 * notice, this list of conditions and the following disclaimer in the
25 * documentation and/or other materials provided with the distribution.
26 * 3. Neither the name of the University nor the names of its contributors
27 * may be used to endorse or promote products derived from this software
28 * without specific prior written permission.
29 *
30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 * SUCH DAMAGE.
41 *
42 * Derived from hp300 version by Mike Hibler, this version by William
43 * Jolitz uses a recursive map [a pde points to the page directory] to
44 * map the page tables using the pagetables themselves. This is done to
45 * reduce the impact on kernel virtual memory for lots of sparse address
46 * space, and to reduce the cost of memory to each process.
47 *
48 * from: hp300: @(#)pmap.h 7.2 (Berkeley) 12/16/90
49 * from: @(#)pmap.h 7.4 (Berkeley) 5/12/91
50 * $FreeBSD$
51 */
52
53 #ifndef _MACHINE_PMAP_NOPAE_H
54 #define _MACHINE_PMAP_NOPAE_H
55
56 #define NTRPPTD 1
57 #define LOWPTDI 1
58 #define KERNPTDI 2
59
60 #define NPGPTD 1
61 #define NPGPTD_SHIFT 10
62 #undef PDRSHIFT
63 #define PDRSHIFT PDRSHIFT_NOPAE
64 #undef NBPDR
65 #define NBPDR (1 << PDRSHIFT_NOPAE) /* bytes/page dir */
66
67 #define PG_FRAME PG_FRAME_NOPAE
68 #define PG_PS_FRAME PG_PS_FRAME_NOPAE
69
70 #define KVA_PAGES (256*4)
71
72 #ifndef NKPT
73 #define NKPT 30
74 #endif
75
76 typedef uint32_t pd_entry_t;
77 typedef uint32_t pt_entry_t;
78 typedef uint32_t pdpt_entry_t; /* Only to keep struct pmap layout. */
79
80 #define PTESHIFT (2)
81 #define PDESHIFT (2)
82
83 #define pde_cmpset(pdep, old, new) atomic_cmpset_int(pdep, old, new)
84 #define pte_load_store(ptep, pte) atomic_swap_int(ptep, pte)
85 #define pte_load_clear(ptep) atomic_swap_int(ptep, 0)
86 #define pte_store(ptep, pte) do { \
87 *(u_int *)(ptep) = (u_int)(pte); \
88 } while (0)
89 #define pte_store_zero(ptep, pte) pte_store(ptep, pte)
90 #define pte_load(ptep) atomic_load_int(ptep)
91
92 extern pt_entry_t PTmap[];
93 extern pd_entry_t PTD[];
94 extern pd_entry_t PTDpde[];
95 extern pd_entry_t *IdlePTD_nopae;
96 extern pt_entry_t *KPTmap_nopae;
97
98 struct pmap;
99 pt_entry_t *__CONCAT(PMTYPE, pmap_pte)(struct pmap *, vm_offset_t) __pure2;
100
101 #endif
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