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
|
/* $OpenBSD: mmu.h,v 1.8 2006/05/21 20:55:43 miod Exp $ */
/*
* This file bears almost no resemblance to the original m68k file,
* so the following copyright notice is questionable, but we are
* nice people.
*/
/*
* Copyright (c) 1988 University of Utah.
* Copyright (c) 1982, 1986, 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* 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.
*
* from: Utah $Hdr: pte.h 1.13 92/01/20$
*
* @(#)pte.h 8.1 (Berkeley) 6/10/93
*/
#ifndef _MACHINE_MMU_H_
#define _MACHINE_MMU_H_
/*
* Parameters which determine the 'geometry' of the m88K page tables in memory.
*/
#define SDT_BITS 10 /* M88K segment table size bits */
#define PDT_BITS 10 /* M88K page table size bits */
#define PG_BITS PAGE_SHIFT /* M88K hardware page size bits */
/*
* Common fields for APR, SDT and PTE
*/
/* address frame */
#define PG_FRAME 0xfffff000
#define PG_SHIFT PG_BITS
#define PG_PFNUM(x) (((x) & PG_FRAME) >> PG_SHIFT)
/* cache control bits */
#define CACHE_DFL 0x00000000
#define CACHE_INH 0x00000040 /* cache inhibit */
#define CACHE_GLOBAL 0x00000080 /* global scope */
#define CACHE_WT 0x00000200 /* write through */
#define CACHE_MASK (CACHE_INH | CACHE_GLOBAL | CACHE_WT)
/*
* Area descriptors
*/
typedef u_int32_t apr_t;
#define APR_V 0x00000001 /* valid bit */
/*
* 88200 PATC (TLB)
*/
#define PATC_ENTRIES 56
/*
* BATC entries
*/
#define BATC_V 0x00000001
#define BATC_PROT 0x00000002
#define BATC_INH 0x00000004
#define BATC_GLOBAL 0x00000008
#define BATC_WT 0x00000010
#define BATC_SO 0x00000020
/*
* Segment table entries
*/
typedef u_int32_t sdt_entry_t;
#define SG_V 0x00000001
#define SG_NV 0x00000000
#define SG_PROT 0x00000004
#define SG_RO 0x00000004
#define SG_RW 0x00000000
#define SG_SO 0x00000100
#define SDT_VALID(sdt) (*(sdt) & SG_V)
#define SDT_SUP(sdt) (*(sdt) & SG_SO)
#define SDT_WP(sdt) (*(sdt) & SG_PROT)
/*
* Page table entries
*/
typedef u_int32_t pt_entry_t;
#define PG_V 0x00000001
#define PG_NV 0x00000000
#define PG_PROT 0x00000004
#define PG_U 0x00000008
#define PG_M 0x00000010
#define PG_M_U 0x00000018
#define PG_RO 0x00000004
#define PG_RW 0x00000000
#define PG_SO 0x00000100
#define PG_W 0x00000020 /* XXX unused but reserved field */
#define PG_U0 0x00000400 /* U0 bit for M88110 */
#define PG_U1 0x00000800 /* U1 bit for M88110 */
#define PDT_VALID(pte) (*(pte) & PG_V)
#define PDT_SUP(pte) (*(pte) & PG_SO)
#define PDT_WP(pte) (*(pte) & PG_PROT)
/*
* Indirect descriptors (mc81110)
*/
typedef u_int32_t pt_ind_entry_t;
/* validity bits */
#define IND_V 0x00000001
#define IND_NV 0x00000000
#define IND_MASKED 0x00000002
#define IND_UNMASKED 0x00000003
#define IND_MASK 0x00000003
#define IND_FRAME 0xfffffffc
#define IND_SHIFT 2
#define IND_PDA(x) ((x) & IND_FRAME >> IND_SHIFT)
/*
* Number of entries in a page table.
*/
#define SDT_ENTRIES (1<<(SDT_BITS))
#define PDT_ENTRIES (1<<(PDT_BITS))
/*
* Size in bytes of a single page table.
*/
#define SDT_SIZE (sizeof(sdt_entry_t) * SDT_ENTRIES)
#define PDT_SIZE (sizeof(pt_entry_t) * PDT_ENTRIES)
/*
* Shifts and masks
*/
#define SDT_SHIFT (PDT_BITS + PG_BITS)
#define PDT_SHIFT (PG_BITS)
#define SDT_MASK (((1 << SDT_BITS) - 1) << SDT_SHIFT)
#define PDT_MASK (((1 << PDT_BITS) - 1) << PDT_SHIFT)
#define SDTIDX(va) (((va) & SDT_MASK) >> SDT_SHIFT)
#define PDTIDX(va) (((va) & PDT_MASK) >> PDT_SHIFT)
/*
* Parameters and macros for BATC
*/
/* number of bits to BATC shift (log2(BATC_BLKBYTES)) */
#define BATC_BLKSHIFT 19
/* 'block' size of a BATC entry mapping */
#define BATC_BLKBYTES (1 << BATC_BLKSHIFT)
/* BATC block mask */
#define BATC_BLKMASK (BATC_BLKBYTES-1)
/* number of BATC entries */
#define BATC_MAX 8
/* physical and logical block address */
#define BATC_PSHIFT 6
#define BATC_VSHIFT (BATC_PSHIFT + (32 - BATC_BLKSHIFT))
#define BATC_BLK_ALIGNED(x) ((x & BATC_BLKMASK) == 0)
#define M88K_BTOBLK(x) (x >> BATC_BLKSHIFT)
static pt_entry_t invalidate_pte(pt_entry_t *);
static __inline__ pt_entry_t
invalidate_pte(pt_entry_t *pte)
{
pt_entry_t oldpte;
oldpte = PG_NV;
__asm__ __volatile__
("xmem %0, %2, r0" : "=r"(oldpte) : "0"(oldpte), "r"(pte));
__asm__ __volatile__ ("tb1 0, r0, 0");
return oldpte;
}
#endif /* __MACHINE_MMU_H__ */
|
