1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
|
/* $NetBSD: pmap.h,v 1.82 2020/03/21 18:47:54 ad Exp $ */
/*
* Copyright (c) 1991 Regents of the University of California.
* All rights reserved.
*
* Changed for the VAX port. /IC
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)pmap.h 7.6 (Berkeley) 5/10/91
*/
/*
* Copyright (c) 1987 Carnegie-Mellon University
*
* Changed for the VAX port. /IC
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)pmap.h 7.6 (Berkeley) 5/10/91
*/
#ifndef PMAP_H
#define PMAP_H
#include <sys/atomic.h>
#include <uvm/uvm_page.h>
#include <machine/pte.h>
#include <machine/mtpr.h>
#include <machine/pcb.h>
/*
* Some constants to make life easier.
*/
#define LTOHPS (PGSHIFT - VAX_PGSHIFT)
#define LTOHPN (1 << LTOHPS)
/*
* Pmap structure
* pm_stack holds lowest allocated memory for the process stack.
*/
struct pmap {
struct pte *pm_p1ap; /* Base of alloced p1 pte space */
u_int pm_count; /* reference count */
struct pcb *pm_pcbs; /* PCBs using this pmap */
struct pte *pm_p0br; /* page 0 base register */
long pm_p0lr; /* page 0 length register */
struct pte *pm_p1br; /* page 1 base register */
long pm_p1lr; /* page 1 length register */
struct pmap_statistics pm_stats; /* Some statistics */
};
/*
* For each struct vm_page, there is a list of all currently valid virtual
* mappings of that page. An entry is a pv_entry_t, the list is pv_table.
*/
struct pv_entry {
struct pv_entry *pv_next; /* next pv_entry */
vaddr_t pv_vaddr; /* address for this physical page */
struct pmap *pv_pmap; /* pmap this entry belongs to */
int pv_attr; /* write/modified bits */
};
extern struct pv_entry *pv_table;
/* Mapping macros used when allocating SPT */
#define MAPVIRT(ptr, count) \
ptr = virtual_avail; \
virtual_avail += (count) * VAX_NBPG;
#define MAPPHYS(ptr, count, perm) \
ptr = avail_start + KERNBASE; \
avail_start += (count) * VAX_NBPG;
/*
* Real nice (fast) routines to get the virtual address of a physical page
* (and vice versa).
*/
#define PMAP_VTOPHYS(va) ((va) & ~KERNBASE)
#define PMAP_MAP_POOLPAGE(pa) ((pa) | KERNBASE)
#define PMAP_UNMAP_POOLPAGE(va) ((va) & ~KERNBASE)
#define PMAP_STEAL_MEMORY
/*
* This is the by far most used pmap routine. Make it inline.
*/
static __inline bool
pmap_extract(pmap_t pmap, vaddr_t va, paddr_t *pap)
{
int *pte, sva;
if (va & KERNBASE) {
paddr_t pa;
pa = kvtophys(va); /* Is 0 if not mapped */
if (pap)
*pap = pa;
if (pa)
return (true);
return (false);
}
sva = PG_PFNUM(va);
if (va < 0x40000000) {
if (sva >= (pmap->pm_p0lr & ~AST_MASK))
goto fail;
pte = (int *)pmap->pm_p0br;
} else {
if (sva < pmap->pm_p1lr)
goto fail;
pte = (int *)pmap->pm_p1br;
}
/*
* Since the PTE tables are sparsely allocated, make sure the page
* table page actually exists before deferencing the pte itself.
*/
if (kvtopte(&pte[sva])->pg_v && (pte[sva] & PG_FRAME)) {
if (pap)
*pap = (pte[sva] & PG_FRAME) << VAX_PGSHIFT;
return (true);
}
fail:
if (pap)
*pap = 0;
return (false);
}
void pmap_page_protect_long(struct pv_entry *, vm_prot_t);
void pmap_protect_long(pmap_t, vaddr_t, vaddr_t, vm_prot_t);
static __inline struct pv_entry *
pmap_pg_to_pv(const struct vm_page *pg)
{
return pv_table + (VM_PAGE_TO_PHYS(pg) >> PGSHIFT);
}
static __inline bool
pmap_is_referenced(struct vm_page *pg)
{
const struct pv_entry * const pv = pmap_pg_to_pv(pg);
return (pv->pv_attr & PG_V) != 0;
}
static __inline void
pmap_page_protect(struct vm_page *pg, vm_prot_t prot)
{
struct pv_entry * const pv = pmap_pg_to_pv(pg);
if (pv->pv_pmap != NULL || pv->pv_next != NULL)
pmap_page_protect_long(pv, prot);
}
static __inline void
pmap_protect(pmap_t pmap, vaddr_t start, vaddr_t end, vm_prot_t prot)
{
if (pmap->pm_p0lr != 0 || pmap->pm_p1lr != 0x200000 ||
(start & KERNBASE) != 0)
pmap_protect_long(pmap, start, end, prot);
}
static __inline bool
pmap_remove_all(struct pmap *pmap)
{
/* Nothing. */
return false;
}
/* Routines that are best to define as macros */
#define pmap_phys_address(phys) ((u_int)(phys) << PGSHIFT)
#define pmap_copy(a,b,c,d,e) /* Dont do anything */
#define pmap_update(pmap) /* nothing (yet) */
#define pmap_remove(pmap, start, end) pmap_protect(pmap, start, end, 0)
#define pmap_resident_count(pmap) ((pmap)->pm_stats.resident_count)
#define pmap_wired_count(pmap) ((pmap)->pm_stats.wired_count)
#define pmap_reference(pmap) atomic_inc_uint(&(pmap)->pm_count)
/* These can be done as efficient inline macros */
#define pmap_copy_page(src, dst) \
__asm("addl3 $0x80000000,%0,%%r0;" \
"addl3 $0x80000000,%1,%%r1;" \
"movc3 $4096,(%%r0),(%%r1)" \
:: "r"(src), "r"(dst) \
: "r0","r1","r2","r3","r4","r5");
#define pmap_zero_page(phys) \
__asm("addl3 $0x80000000,%0,%%r0;" \
"movc5 $0,(%%r0),$0,$4096,(%%r0)" \
:: "r"(phys) \
: "r0","r1","r2","r3","r4","r5");
/* Prototypes */
void pmap_bootstrap(void);
vaddr_t pmap_map(vaddr_t, vaddr_t, vaddr_t, int);
#if 0
#define __HAVE_VM_PAGE_MD
struct vm_page_md {
unsigned int md_attrs;
};
#define VM_MDPAGE_INIT(pg) ((pg)->mdpage.md_attrs = 0)
#endif
#endif /* PMAP_H */
|