pmap.h revision 1.25 
1/* $NetBSD: pmap.h,v 1.25 1999/02/04 19:48:21 thorpej Exp $ */
2
3/*-
4 * Copyright (c) 1998 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
9 * NASA Ames Research Center and by Chris G. Demetriou.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 *    must display the following acknowledgement:
21 *	This product includes software developed by the NetBSD
22 *	Foundation, Inc. and its contributors.
23 * 4. Neither the name of The NetBSD Foundation nor the names of its
24 *    contributors may be used to endorse or promote products derived
25 *    from this software without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
30 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37 * POSSIBILITY OF SUCH DAMAGE.
38 */
39
40/*
41 * Copyright (c) 1987 Carnegie-Mellon University
42 * Copyright (c) 1991, 1993
43 *	The Regents of the University of California.  All rights reserved.
44 *
45 * This code is derived from software contributed to Berkeley by
46 * the Systems Programming Group of the University of Utah Computer
47 * Science Department.
48 *
49 * Redistribution and use in source and binary forms, with or without
50 * modification, are permitted provided that the following conditions
51 * are met:
52 * 1. Redistributions of source code must retain the above copyright
53 *    notice, this list of conditions and the following disclaimer.
54 * 2. Redistributions in binary form must reproduce the above copyright
55 *    notice, this list of conditions and the following disclaimer in the
56 *    documentation and/or other materials provided with the distribution.
57 * 3. All advertising materials mentioning features or use of this software
58 *    must display the following acknowledgement:
59 *	This product includes software developed by the University of
60 *	California, Berkeley and its contributors.
61 * 4. Neither the name of the University nor the names of its contributors
62 *    may be used to endorse or promote products derived from this software
63 *    without specific prior written permission.
64 *
65 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
66 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
67 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
68 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
69 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
70 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
71 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
72 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
73 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
74 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
75 * SUCH DAMAGE.
76 *
77 *	@(#)pmap.h	8.1 (Berkeley) 6/10/93
78 */
79
80#ifndef	_PMAP_MACHINE_
81#define	_PMAP_MACHINE_
82
83#include <sys/lock.h>
84#include <sys/queue.h>
85
86#include <machine/pte.h>
87
88/*
89 * Machine-dependent virtual memory state.
90 *
91 * If we ever support processor numbers higher than 63, we'll have to
92 * rethink the CPU mask.
93 *
94 * Note pm_asn and pm_asngen are arrays allocated in pmap_create().
95 * Their size is based on the PCS count from the HWRPB, and indexed
96 * by processor ID (from `whami').
97 *
98 * The kernel pmap is a special case; it gets statically-allocated
99 * arrays which hold enough for ALPHA_MAXPROCS.
100 */
101struct pmap {
102	LIST_ENTRY(pmap)	pm_list;	/* list of all pmaps */
103	pt_entry_t		*pm_lev1map;	/* level 1 map */
104	int			pm_count;	/* pmap reference count */
105	struct simplelock	pm_slock;	/* lock on pmap */
106	struct pmap_statistics	pm_stats;	/* pmap statistics */
107	long			pm_nlev2;	/* level 2 pt page count */
108	long			pm_nlev3;	/* level 3 pt page count */
109	unsigned int		*pm_asn;	/* address space number */
110	unsigned long		*pm_asngen;	/* ASN generation number */
111	unsigned long		pm_cpus;	/* mask of CPUs using pmap */
112};
113
114typedef struct pmap	*pmap_t;
115
116#define	PMAP_ASN_RESERVED	0	/* reserved for Lev1map users */
117
118extern struct pmap	kernel_pmap_store;
119
120#define pmap_kernel()	(&kernel_pmap_store)
121
122/*
123 * For each vm_page_t, there is a list of all currently valid virtual
124 * mappings of that page.  An entry is a pv_entry_t, the list is pv_table.
125 */
126typedef struct pv_entry {
127	LIST_ENTRY(pv_entry) pv_list;	/* pv_entry list */
128	struct pmap	*pv_pmap;	/* pmap where mapping lies */
129	vaddr_t		pv_va;		/* virtual address for mapping */
130} *pv_entry_t;
131
132/*
133 * The head of the list of pv_entry_t's, also contains page attributes.
134 */
135struct pv_head {
136	LIST_HEAD(, pv_entry) pvh_list;		/* pv_entry list */
137	struct simplelock pvh_slock;		/* lock on this head */
138	int pvh_attrs;				/* page attributes */
139	int pvh_usage;				/* page usage */
140	int pvh_refcnt;				/* special use ref count */
141};
142
143/* pvh_attrs */
144#define	PGA_MODIFIED		0x01		/* modified */
145#define	PGA_REFERENCED		0x02		/* referenced */
146
147/* pvh_usage */
148#define	PGU_NORMAL		0		/* free or normal use */
149#define	PGU_PVENT		1		/* PV entries */
150#define	PGU_L1PT		2		/* level 1 page table */
151#define	PGU_L2PT		3		/* level 2 page table */
152#define	PGU_L3PT		4		/* level 3 page table */
153
154#define	PGU_ISPTPAGE(pgu)	((pgu) >= PGU_L1PT)
155
156#define	PGU_STRINGS							\
157{									\
158	"normal",							\
159	"pvent",							\
160	"l1pt",								\
161	"l2pt",								\
162	"l3pt",								\
163}
164
165struct pv_page_info {
166	TAILQ_ENTRY(pv_page) pgi_list;
167	LIST_HEAD(, pv_entry) pgi_freelist;
168	int pgi_nfree;
169};
170
171struct pv_page {
172	struct pv_page_info pvp_pgi;
173	struct pv_entry pvp_pv[1];		/* variable length */
174};
175
176#ifdef _KERNEL
177
178#ifndef _LKM
179#include "opt_new_scc_driver.h"
180#include "opt_dec_3000_300.h"			/* XXX */
181#include "opt_dec_3000_500.h"			/* XXX */
182#include "opt_dec_kn8ae.h"			/* XXX */
183#include "opt_dec_kn300.h"			/* XXX */
184
185#if defined(NEW_SCC_DRIVER)
186#if defined(DEC_KN8AE) || defined(DEC_KN300)
187#define	_PMAP_MAY_USE_PROM_CONSOLE
188#endif
189#else /* ! NEW_SCC_DRIVER */
190#if defined(DEC_3000_300)		\
191 || defined(DEC_3000_500)		\
192 || defined(DEC_KN300)			\
193 || defined(DEC_KN8AE) 				/* XXX */
194#define _PMAP_MAY_USE_PROM_CONSOLE		/* XXX */
195#endif						/* XXX */
196#endif /* NEW_SCC_DRIVER */
197#endif /* _LKM */
198
199#define	pmap_resident_count(pmap)	((pmap)->pm_stats.resident_count)
200#define	pmap_wired_count(pmap)		((pmap)->pm_stats.wired_count)
201
202extern	pt_entry_t *VPT;		/* Virtual Page Table */
203
204#define	PMAP_STEAL_MEMORY		/* enable pmap_steal_memory() */
205
206/*
207 * Alternate mapping hooks for pool pages.  Avoids thrashing the TLB.
208 */
209#define	PMAP_MAP_POOLPAGE(pa)		ALPHA_PHYS_TO_K0SEG((pa))
210#define	PMAP_UNMAP_POOLPAGE(va)		ALPHA_K0SEG_TO_PHYS((va))
211
212paddr_t vtophys __P((vaddr_t));
213
214/* Machine-specific functions. */
215void	pmap_bootstrap __P((paddr_t ptaddr, u_int maxasn, u_long ncpuids));
216void	pmap_emulate_reference __P((struct proc *p, vaddr_t v,
217		int user, int write));
218#ifdef _PMAP_MAY_USE_PROM_CONSOLE
219int	pmap_uses_prom_console __P((void));
220#endif
221
222#define	pmap_pte_pa(pte)	(PG_PFNUM(*(pte)) << PGSHIFT)
223#define	pmap_pte_prot(pte)	(*(pte) & PG_PROT)
224#define	pmap_pte_w(pte)		(*(pte) & PG_WIRED)
225#define	pmap_pte_v(pte)		(*(pte) & PG_V)
226#define	pmap_pte_pv(pte)	(*(pte) & PG_PVLIST)
227#define	pmap_pte_asm(pte)	(*(pte) & PG_ASM)
228#define	pmap_pte_exec(pte)	(*(pte) & PG_EXEC)
229
230#define	pmap_pte_set_w(pte, v)						\
231do {									\
232	if (v)								\
233		*(pte) |= PG_WIRED;					\
234	else								\
235		*(pte) &= ~PG_WIRED;					\
236} while (0)
237
238#define	pmap_pte_w_chg(pte, nw)	((nw) ^ pmap_pte_w(pte))
239
240#define	pmap_pte_set_prot(pte, np)					\
241do {									\
242	*(pte) &= ~PG_PROT;						\
243	*(pte) |= (np);							\
244} while (0)
245
246#define	pmap_pte_prot_chg(pte, np) ((np) ^ pmap_pte_prot(pte))
247
248static __inline pt_entry_t *pmap_l2pte __P((pmap_t, vaddr_t, pt_entry_t *));
249static __inline pt_entry_t *pmap_l3pte __P((pmap_t, vaddr_t, pt_entry_t *));
250
251#define	pmap_l1pte(pmap, v)						\
252	(&(pmap)->pm_lev1map[l1pte_index((vaddr_t)(v))])
253
254static __inline pt_entry_t *
255pmap_l2pte(pmap, v, l1pte)
256	pmap_t pmap;
257	vaddr_t v;
258	pt_entry_t *l1pte;
259{
260	pt_entry_t *lev2map;
261
262	if (l1pte == NULL) {
263		l1pte = pmap_l1pte(pmap, v);
264		if (pmap_pte_v(l1pte) == 0)
265			return (NULL);
266	}
267
268	lev2map = (pt_entry_t *)ALPHA_PHYS_TO_K0SEG(pmap_pte_pa(l1pte));
269	return (&lev2map[l2pte_index(v)]);
270}
271
272static __inline pt_entry_t *
273pmap_l3pte(pmap, v, l2pte)
274	pmap_t pmap;
275	vaddr_t v;
276	pt_entry_t *l2pte;
277{
278	pt_entry_t *l1pte, *lev2map, *lev3map;
279
280	if (l2pte == NULL) {
281		l1pte = pmap_l1pte(pmap, v);
282		if (pmap_pte_v(l1pte) == 0)
283			return (NULL);
284
285		lev2map = (pt_entry_t *)ALPHA_PHYS_TO_K0SEG(pmap_pte_pa(l1pte));
286		l2pte = &lev2map[l2pte_index(v)];
287		if (pmap_pte_v(l2pte) == 0)
288			return (NULL);
289	}
290
291	lev3map = (pt_entry_t *)ALPHA_PHYS_TO_K0SEG(pmap_pte_pa(l2pte));
292	return (&lev3map[l3pte_index(v)]);
293}
294
295#endif /* _KERNEL */
296
297#endif /* _PMAP_MACHINE_ */
298