pmap.h revision 1.2 1 /*
2 * Copyright (c) 1987 Carnegie-Mellon University
3 * Copyright (c) 1991 Regents of the University of California.
4 * All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * the Systems Programming Group of the University of Utah Computer
8 * Science Department.
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 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * from: @(#)pmap.h 7.6 (Berkeley) 5/10/91
39 * $Id: pmap.h,v 1.2 1993/08/01 19:23:38 mycroft Exp $
40 */
41
42 #ifndef _PMAP_MACHINE_
43 #define _PMAP_MACHINE_
44
45 #define AMIGA_PAGE_SIZE NBPG
46 #define AMIGA_SEG_SIZE NBSEG
47
48 /*
49 * Pmap stuff
50 */
51 struct pmap {
52 struct pte *pm_ptab; /* KVA of page table */
53 struct ste *pm_stab; /* KVA of segment table */
54 int pm_stchanged; /* ST changed */
55 short pm_sref; /* segment table ref count */
56 short pm_count; /* pmap reference count */
57 simple_lock_data_t pm_lock; /* lock on pmap */
58 struct pmap_statistics pm_stats; /* pmap statistics */
59 long pm_ptpages; /* more stats: PT pages */
60 };
61
62 typedef struct pmap *pmap_t;
63
64 extern pmap_t kernel_pmap;
65
66 /*
67 * Macros for speed
68 */
69 #define PMAP_ACTIVATE(pmapp, pcbp, iscurproc) \
70 if ((pmapp) != NULL && (pmapp)->pm_stchanged) { \
71 (pcbp)->pcb_ustp = \
72 amiga_btop(pmap_extract(kernel_pmap, (pmapp)->pm_stab)); \
73 if (iscurproc) \
74 loadustp((pcbp)->pcb_ustp); \
75 (pmapp)->pm_stchanged = FALSE; \
76 }
77 #define PMAP_DEACTIVATE(pmapp, pcbp)
78
79 /*
80 * For each vm_page_t, there is a list of all currently valid virtual
81 * mappings of that page. An entry is a pv_entry_t, the list is pv_table.
82 */
83 typedef struct pv_entry {
84 struct pv_entry *pv_next; /* next pv_entry */
85 struct pmap *pv_pmap; /* pmap where mapping lies */
86 vm_offset_t pv_va; /* virtual address for mapping */
87 struct ste *pv_ptste; /* non-zero if VA maps a PT page */
88 struct pmap *pv_ptpmap; /* if pv_ptste, pmap for PT page */
89 int pv_flags; /* flags */
90 } *pv_entry_t;
91
92 #define PV_CI 0x01 /* all entries must be cache inhibited */
93 #define PV_PTPAGE 0x02 /* entry maps a page table page */
94
95 #ifdef KERNEL
96 pv_entry_t pv_table; /* array of entries, one per page */
97
98 #define pa_index(pa) atop(pa - vm_first_phys)
99 #define pa_to_pvh(pa) (&pv_table[pa_index(pa)])
100
101 #define pmap_kernel() (kernel_pmap)
102 #define pmap_resident_count(pmap) ((pmap)->pm_stats.resident_count)
103
104 extern struct pte *Sysmap;
105 extern char *vmmap; /* map for mem, dumps, etc. */
106 #endif KERNEL
107
108 #endif _PMAP_MACHINE_
109