1 /*-
2 * Copyright (c) 1991 Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * the Systems Programming Group of the University of Utah Computer
7 * Science Department and William Jolitz of UUNET Technologies Inc.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * Derived from hp300 version by Mike Hibler, this version by William
34 * Jolitz uses a recursive map [a pde points to the page directory] to
35 * map the page tables using the pagetables themselves. This is done to
36 * reduce the impact on kernel virtual memory for lots of sparse address
37 * space, and to reduce the cost of memory to each process.
38 *
39 * from: hp300: @(#)pmap.h 7.2 (Berkeley) 12/16/90
40 * from: @(#)pmap.h 7.4 (Berkeley) 5/12/91
41 * from: src/sys/i386/include/pmap.h,v 1.65.2.2 2000/11/30 01:54:42 peter
42 * JNPR: pmap.h,v 1.7.2.1 2007/09/10 07:44:12 girish
43 * $FreeBSD$
44 */
45
46 #ifndef _MACHINE_PMAP_H_
47 #define _MACHINE_PMAP_H_
48
49 #include <machine/vmparam.h>
50 #include <machine/pte.h>
51
52 #define NKPT 120 /* actual number of kernel page tables */
53
54 #ifndef LOCORE
55
56 #include <sys/queue.h>
57 #include <sys/_lock.h>
58 #include <sys/_mutex.h>
59
60 /*
61 * Pmap stuff
62 */
63 struct pv_entry;
64
65 struct md_page {
66 int pv_list_count;
67 int pv_flags;
68 TAILQ_HEAD(, pv_entry) pv_list;
69 };
70
71 #define PV_TABLE_MOD 0x01 /* modified */
72 #define PV_TABLE_REF 0x02 /* referenced */
73
74 #define ASID_BITS 8
75 #define ASIDGEN_BITS (32 - ASID_BITS)
76 #define ASIDGEN_MASK ((1 << ASIDGEN_BITS) - 1)
77
78 struct pmap {
79 pd_entry_t *pm_segtab; /* KVA of segment table */
80 TAILQ_HEAD(, pv_entry) pm_pvlist; /* list of mappings in
81 * pmap */
82 cpumask_t pm_active; /* active on cpus */
83 struct {
84 u_int32_t asid:ASID_BITS; /* TLB address space tag */
85 u_int32_t gen:ASIDGEN_BITS; /* its generation number */
86 } pm_asid[MAXSMPCPU];
87 struct pmap_statistics pm_stats; /* pmap statistics */
88 struct vm_page *pm_ptphint; /* pmap ptp hint */
89 struct mtx pm_mtx;
90 };
91
92 typedef struct pmap *pmap_t;
93
94 #ifdef _KERNEL
95
96 pt_entry_t *pmap_pte(pmap_t, vm_offset_t);
97 vm_offset_t pmap_kextract(vm_offset_t va);
98
99 #define vtophys(va) pmap_kextract(((vm_offset_t) (va)))
100 #define pmap_asid(pmap) (pmap)->pm_asid[PCPU_GET(cpuid)].asid
101
102 extern struct pmap kernel_pmap_store;
103 #define kernel_pmap (&kernel_pmap_store)
104
105 #define PMAP_LOCK(pmap) mtx_lock(&(pmap)->pm_mtx)
106 #define PMAP_LOCK_ASSERT(pmap, type) mtx_assert(&(pmap)->pm_mtx, (type))
107 #define PMAP_LOCK_DESTROY(pmap) mtx_destroy(&(pmap)->pm_mtx)
108 #define PMAP_LOCK_INIT(pmap) mtx_init(&(pmap)->pm_mtx, "pmap", \
109 NULL, MTX_DEF)
110 #define PMAP_LOCKED(pmap) mtx_owned(&(pmap)->pm_mtx)
111 #define PMAP_MTX(pmap) (&(pmap)->pm_mtx)
112 #define PMAP_TRYLOCK(pmap) mtx_trylock(&(pmap)->pm_mtx)
113 #define PMAP_UNLOCK(pmap) mtx_unlock(&(pmap)->pm_mtx)
114
115 /*
116 * For each vm_page_t, there is a list of all currently valid virtual
117 * mappings of that page. An entry is a pv_entry_t, the list is pv_table.
118 */
119 typedef struct pv_entry {
120 pmap_t pv_pmap; /* pmap where mapping lies */
121 vm_offset_t pv_va; /* virtual address for mapping */
122 TAILQ_ENTRY(pv_entry) pv_list;
123 TAILQ_ENTRY(pv_entry) pv_plist;
124 vm_page_t pv_ptem; /* VM page for pte */
125 } *pv_entry_t;
126
127 /*
128 * physmem_desc[] is a superset of phys_avail[] and describes all the
129 * memory present in the system.
130 *
131 * phys_avail[] is similar but does not include the memory stolen by
132 * pmap_steal_memory().
133 *
134 * Each memory region is described by a pair of elements in the array
135 * so we can describe up to (PHYS_AVAIL_ENTRIES / 2) distinct memory
136 * regions.
137 */
138 #define PHYS_AVAIL_ENTRIES 10
139 extern vm_offset_t phys_avail[PHYS_AVAIL_ENTRIES + 2];
140 extern vm_offset_t physmem_desc[PHYS_AVAIL_ENTRIES + 2];
141
142 extern vm_offset_t virtual_avail;
143 extern vm_offset_t virtual_end;
144
145 extern vm_paddr_t dump_avail[PHYS_AVAIL_ENTRIES + 2];
146
147 #define pmap_page_get_memattr(m) VM_MEMATTR_DEFAULT
148 #define pmap_page_is_mapped(m) (!TAILQ_EMPTY(&(m)->md.pv_list))
149 #define pmap_page_set_memattr(m, ma) (void)0
150
151 void pmap_bootstrap(void);
152 void *pmap_mapdev(vm_offset_t, vm_size_t);
153 void pmap_unmapdev(vm_offset_t, vm_size_t);
154 vm_offset_t pmap_steal_memory(vm_size_t size);
155 int page_is_managed(vm_offset_t pa);
156 void pmap_kenter(vm_offset_t va, vm_paddr_t pa);
157 void pmap_kenter_attr(vm_offset_t va, vm_paddr_t pa, int attr);
158 void pmap_kremove(vm_offset_t va);
159 void *pmap_kenter_temporary(vm_paddr_t pa, int i);
160 void pmap_kenter_temporary_free(vm_paddr_t pa);
161 int pmap_compute_pages_to_dump(void);
162 void pmap_flush_pvcache(vm_page_t m);
163 int pmap_emulate_modified(pmap_t pmap, vm_offset_t va);
164 #endif /* _KERNEL */
165
166 #endif /* !LOCORE */
167
168 #endif /* !_MACHINE_PMAP_H_ */
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