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
|
/* $OpenBSD: pmap.h,v 1.5 2004/09/23 08:42:38 pefo Exp $ */
/*
* Copyright (c) 1987 Carnegie-Mellon University
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Ralph Campbell.
*
* 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.
*
* from: @(#)pmap.h 8.1 (Berkeley) 6/10/93
*/
#ifndef _MIPS_PMAP_H_
#define _MIPS_PMAP_H_
/*
* The user address space is 2Gb (0x0 - 0x80000000).
* User programs are laid out in memory as follows:
* address
* USRTEXT 0x00400000
* USRDATA 0x10000000
* USRSTACK 0x7FFFFFFF
*
* The user address space is mapped using a two level structure where
* virtual address bits 30..22 are used to index into a segment table which
* points to a page worth of PTEs (4096 page can hold 1024 PTEs).
* Bits 21..12 are then used to index a PTE which describes a page within
* a segment.
*
* The wired entries in the TLB will contain the following:
* 0-1 (UPAGES) for curproc user struct and kernel stack.
*
* Note: The kernel doesn't use the same data structures as user programs.
* All the PTE entries are stored in a single array in Sysmap which is
* dynamically allocated at boot time.
*/
#define mips_trunc_seg(x) ((vaddr_t)(x) & ~SEGOFSET)
#define mips_round_seg(x) (((vaddr_t)(x) + SEGOFSET) & ~SEGOFSET)
#define pmap_segmap(m, v) ((m)->pm_segtab->seg_tab[((v) >> SEGSHIFT)])
#define PMAP_SEGTABSIZE 512
union pt_entry;
struct segtab {
union pt_entry *seg_tab[PMAP_SEGTABSIZE];
};
/*
* Machine dependent pmap structure.
*/
typedef struct pmap {
int pm_count; /* pmap reference count */
simple_lock_data_t pm_lock; /* lock on pmap */
struct pmap_statistics pm_stats; /* pmap statistics */
int pm_tlbpid; /* address space tag */
u_int pm_tlbgen; /* TLB PID generation number */
struct segtab *pm_segtab; /* pointers to pages of PTEs */
} *pmap_t;
#ifdef _KERNEL
extern struct pmap kernel_pmap_store;
#define pmap_resident_count(pmap) ((pmap)->pm_stats.resident_count)
#define pmap_wired_count(pmap) ((pmap)->pm_stats.wired_count)
#define pmap_kernel() (&kernel_pmap_store)
#define pmap_phys_address(ppn) ptoa(ppn)
#define PMAP_STEAL_MEMORY /* Enable 'stealing' during boot */
#define PMAP_PREFER(pa, va) pmap_prefer(pa, va)
#define pmap_update(x) /* nothing */
void pmap_bootstrap(void);
int pmap_is_page_ro( pmap_t, vaddr_t, int);
void pmap_kenter_cache(vaddr_t va, paddr_t pa, vm_prot_t prot, int cache);
void pmap_prefer(vaddr_t, vaddr_t *);
void pmap_set_modify(vm_page_t);
#define pmap_proc_iflush(p,va,len) /* nothing yet (handled in trap now) */
#define pmap_unuse_final(p) /* nothing yet */
paddr_t vtophys(void *);
#endif /* _KERNEL */
#endif /* !_MIPS_PMAP_H_ */
|
