1 /* $NetBSD: pmap3.h,v 1.51 2020/03/14 14:05:44 ad Exp $ */
2
3 /*-
4 * Copyright (c) 1996 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Adam Glass and Gordon W. Ross.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #ifdef _KERNEL
33 /*
34 * Physical map structures exported to the VM code.
35 */
36
37 struct pmap {
38 unsigned char *pm_segmap; /* soft copy of segmap */
39 int pm_ctxnum; /* MMU context number */
40 u_int pm_refcount; /* reference count */
41 int pm_version;
42 };
43
44 /*
45 * We give the pmap code a chance to resolve faults by
46 * reloading translations that it was forced to unload.
47 * This function does that, and calls vm_fault if it
48 * could not resolve the fault by reloading the MMU.
49 */
50 int _pmap_fault(struct vm_map *, vaddr_t, vm_prot_t);
51
52 /* This lets us have some say in choosing VA locations. */
53 extern void pmap_prefer(vaddr_t, vaddr_t *, int);
54 #define PMAP_PREFER(fo, ap, sz, td) pmap_prefer((fo), (ap), (td))
55
56 /* This needs to be a macro for kern_sysctl.c */
57 extern segsz_t pmap_resident_pages(pmap_t);
58 #define pmap_resident_count(pmap) (pmap_resident_pages(pmap))
59
60 /* This needs to be a macro for vm_mmap.c */
61 extern segsz_t pmap_wired_pages(pmap_t);
62 #define pmap_wired_count(pmap) (pmap_wired_pages(pmap))
63
64 /* We use the PA plus some low bits for device mmap. */
65 #define pmap_phys_address(addr) (addr)
66
67 /* Map a given physical region to a virtual region */
68 extern vaddr_t pmap_map(vaddr_t, paddr_t, paddr_t, int);
69
70 static __inline bool
pmap_remove_all(struct pmap * pmap)71 pmap_remove_all(struct pmap *pmap)
72 {
73 /* Nothing. */
74 return false;
75 }
76
77 /*
78 * Since PTEs also contain type bits, we have to have some way
79 * to tell pmap_enter `this is an IO page' or `this is not to
80 * be cached'. Since physical addresses are always aligned, we
81 * can do this with the low order bits.
82 *
83 * The values below must agree with pte.h such that:
84 * (PMAP_OBIO << PG_MOD_SHIFT) == PGT_OBIO
85 */
86 #define PMAP_OBMEM 0x00 /* unused */
87 #define PMAP_OBIO 0x04 /* tells pmap_enter to use PG_OBIO */
88 #define PMAP_VME16 0x08 /* etc */
89 #define PMAP_VME32 0x0C /* etc */
90 #define PMAP_NC 0x10 /* tells pmap_enter to set PG_NC */
91 #define PMAP_SPEC 0x1C /* mask to get all above. */
92
93 #endif /* _KERNEL */
94
95 /* MMU specific segment size */
96 #define SEGSHIFT 17 /* LOG2(NBSG) */
97 #define NBSG (1 << SEGSHIFT) /* bytes/segment */
98 #define SEGOFSET (NBSG - 1) /* byte offset into segment */
99
100 #define sun3_round_seg(x) ((((vaddr_t)(x)) + SEGOFSET) & ~SEGOFSET)
101 #define sun3_trunc_seg(x) ((vaddr_t)(x) & ~SEGOFSET)
102 #define sun3_seg_offset(x) ((vaddr_t)(x) & SEGOFSET)
103