1 /*-
2 * Copyright 2014 Svatopluk Kraus <onwahe@gmail.com>
3 * Copyright 2014 Michal Meloun <meloun@miracle.cz>
4 * Copyright (c) 1991 Regents of the University of California.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * the Systems Programming Group of the University of Utah Computer
9 * Science Department and William Jolitz of UUNET Technologies Inc.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * The ARM version of this file was more or less based on the i386 version,
33 * which has the following provenance...
34 *
35 * Derived from hp300 version by Mike Hibler, this version by William
36 * Jolitz uses a recursive map [a pde points to the page directory] to
37 * map the page tables using the pagetables themselves. This is done to
38 * reduce the impact on kernel virtual memory for lots of sparse address
39 * space, and to reduce the cost of memory to each process.
40 *
41 * from: hp300: @(#)pmap.h 7.2 (Berkeley) 12/16/90
42 * from: @(#)pmap.h 7.4 (Berkeley) 5/12/91
43 * from: FreeBSD: src/sys/i386/include/pmap.h,v 1.70 2000/11/30
44 *
45 * $FreeBSD$
46 */
47
48 #ifndef _MACHINE_PMAP_V6_H_
49 #define _MACHINE_PMAP_V6_H_
50
51 #include <sys/queue.h>
52 #include <sys/_cpuset.h>
53 #include <sys/_lock.h>
54 #include <sys/_mutex.h>
55 #include <sys/_pv_entry.h>
56
57 typedef uint32_t pt1_entry_t; /* L1 table entry */
58 typedef uint32_t pt2_entry_t; /* L2 table entry */
59 typedef uint32_t ttb_entry_t; /* TTB entry */
60
61 #ifdef _KERNEL
62
63 #if 0
64 #define PMAP_PTE_NOCACHE // Use uncached page tables
65 #endif
66
67 /*
68 * (1) During pmap bootstrap, physical pages for L2 page tables are
69 * allocated in advance which are used for KVA continuous mapping
70 * starting from KERNBASE. This makes things more simple.
71 * (2) During vm subsystem initialization, only vm subsystem itself can
72 * allocate physical memory safely. As pmap_map() is called during
73 * this initialization, we must be prepared for that and have some
74 * preallocated physical pages for L2 page tables.
75 *
76 * Note that some more pages for L2 page tables are preallocated too
77 * for mappings laying above VM_MAX_KERNEL_ADDRESS.
78 */
79 #ifndef NKPT2PG
80 /*
81 * The optimal way is to define this in board configuration as
82 * definition here must be safe enough. It means really big.
83 *
84 * 1 GB KVA <=> 256 kernel L2 page table pages
85 *
86 * From real platforms:
87 * 1 GB physical memory <=> 10 pages is enough
88 * 2 GB physical memory <=> 21 pages is enough
89 */
90 #define NKPT2PG 32
91 #endif
92 #endif /* _KERNEL */
93
94 /*
95 * Pmap stuff
96 */
97 struct md_page {
98 TAILQ_HEAD(,pv_entry) pv_list;
99 uint16_t pt2_wirecount[4];
100 vm_memattr_t pat_mode;
101 };
102
103 struct pmap {
104 struct mtx pm_mtx;
105 pt1_entry_t *pm_pt1; /* KVA of pt1 */
106 pt2_entry_t *pm_pt2tab; /* KVA of pt2 pages table */
107 TAILQ_HEAD(,pv_chunk) pm_pvchunk; /* list of mappings in pmap */
108 cpuset_t pm_active; /* active on cpus */
109 struct pmap_statistics pm_stats; /* pmap statictics */
110 LIST_ENTRY(pmap) pm_list; /* List of all pmaps */
111 };
112
113 typedef struct pmap *pmap_t;
114
115 #ifdef _KERNEL
116 extern struct pmap kernel_pmap_store;
117 #define kernel_pmap (&kernel_pmap_store)
118
119 #define PMAP_LOCK(pmap) mtx_lock(&(pmap)->pm_mtx)
120 #define PMAP_LOCK_ASSERT(pmap, type) \
121 mtx_assert(&(pmap)->pm_mtx, (type))
122 #define PMAP_LOCK_DESTROY(pmap) mtx_destroy(&(pmap)->pm_mtx)
123 #define PMAP_LOCK_INIT(pmap) mtx_init(&(pmap)->pm_mtx, "pmap", \
124 NULL, MTX_DEF | MTX_DUPOK)
125 #define PMAP_LOCKED(pmap) mtx_owned(&(pmap)->pm_mtx)
126 #define PMAP_MTX(pmap) (&(pmap)->pm_mtx)
127 #define PMAP_TRYLOCK(pmap) mtx_trylock(&(pmap)->pm_mtx)
128 #define PMAP_UNLOCK(pmap) mtx_unlock(&(pmap)->pm_mtx)
129
130 extern ttb_entry_t pmap_kern_ttb; /* TTB for kernel pmap */
131
132 #define pmap_page_get_memattr(m) ((m)->md.pat_mode)
133
134 /*
135 * Only the following functions or macros may be used before pmap_bootstrap()
136 * is called: pmap_kenter(), pmap_kextract(), pmap_kremove(), vtophys(), and
137 * vtopte2().
138 */
139 void pmap_bootstrap(vm_offset_t);
140 void pmap_kenter(vm_offset_t, vm_paddr_t);
141 void pmap_kremove(vm_offset_t);
142 boolean_t pmap_page_is_mapped(vm_page_t);
143 bool pmap_ps_enabled(pmap_t pmap);
144
145 void pmap_tlb_flush(pmap_t, vm_offset_t);
146 void pmap_tlb_flush_range(pmap_t, vm_offset_t, vm_size_t);
147
148 vm_paddr_t pmap_dump_kextract(vm_offset_t, pt2_entry_t *);
149
150 int pmap_fault(pmap_t, vm_offset_t, uint32_t, int, bool);
151
152 void pmap_set_tex(void);
153
154 /*
155 * Pre-bootstrap epoch functions set.
156 */
157 void pmap_bootstrap_prepare(vm_paddr_t);
158 vm_paddr_t pmap_preboot_get_pages(u_int);
159 void pmap_preboot_map_pages(vm_paddr_t, vm_offset_t, u_int);
160 vm_offset_t pmap_preboot_reserve_pages(u_int);
161 vm_offset_t pmap_preboot_get_vpages(u_int);
162 void pmap_preboot_map_attr(vm_paddr_t, vm_offset_t, vm_size_t, vm_prot_t,
163 vm_memattr_t);
164 void pmap_remap_vm_attr(vm_memattr_t old_attr, vm_memattr_t new_attr);
165
166 #endif /* _KERNEL */
167 #endif /* !_MACHINE_PMAP_V6_H_ */
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