aboutsummaryrefslogtreecommitdiff
path: root/sys/arm/include/pmap-v6.h
blob: 10296db2ccbf16643d9f43bc43a220c0ab13e044 (plain) (blame)
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
/*-
 * Copyright 2014 Svatopluk Kraus <onwahe@gmail.com>
 * Copyright 2014 Michal Meloun <meloun@miracle.cz>
 * Copyright (c) 1991 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 and William Jolitz of UUNET Technologies Inc.
 *
 * 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.
 *
 * 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.
 *
 * The ARM version of this file was more or less based on the i386 version,
 * which has the following provenance...
 *
 * Derived from hp300 version by Mike Hibler, this version by William
 * Jolitz uses a recursive map [a pde points to the page directory] to
 * map the page tables using the pagetables themselves. This is done to
 * reduce the impact on kernel virtual memory for lots of sparse address
 * space, and to reduce the cost of memory to each process.
 *
 *      from: hp300: @(#)pmap.h 7.2 (Berkeley) 12/16/90
 *      from: @(#)pmap.h        7.4 (Berkeley) 5/12/91
 * 	from: FreeBSD: src/sys/i386/include/pmap.h,v 1.70 2000/11/30
 *
 * $FreeBSD$
 */

#ifndef _MACHINE_PMAP_V6_H_
#define _MACHINE_PMAP_V6_H_

#include <sys/queue.h>
#include <sys/_cpuset.h>
#include <sys/_lock.h>
#include <sys/_mutex.h>

typedef	uint32_t	pt1_entry_t;		/* L1 table entry */
typedef	uint32_t	pt2_entry_t;		/* L2 table entry */
typedef uint32_t	ttb_entry_t;		/* TTB entry */

#ifdef _KERNEL

#if 0
#define PMAP_PTE_NOCACHE // Use uncached page tables
#endif

/*
 *  (1) During pmap bootstrap, physical pages for L2 page tables are
 *      allocated in advance which are used for KVA continuous mapping
 *      starting from KERNBASE. This makes things more simple.
 *  (2) During vm subsystem initialization, only vm subsystem itself can
 *      allocate physical memory safely. As pmap_map() is called during
 *      this initialization, we must be prepared for that and have some
 *      preallocated physical pages for L2 page tables.
 *
 *  Note that some more pages for L2 page tables are preallocated too
 *  for mappings laying above VM_MAX_KERNEL_ADDRESS.
 */
#ifndef NKPT2PG
/*
 *  The optimal way is to define this in board configuration as
 *  definition here must be safe enough. It means really big.
 *
 *  1 GB KVA <=> 256 kernel L2 page table pages
 *
 *  From real platforms:
 *	1 GB physical memory <=> 10 pages is enough
 *	2 GB physical memory <=> 21 pages is enough
 */
#define NKPT2PG		32
#endif
#endif	/* _KERNEL */

/*
 * Pmap stuff
 */
struct	pv_entry;
struct	pv_chunk;

struct	md_page {
	TAILQ_HEAD(,pv_entry)	pv_list;
	uint16_t		pt2_wirecount[4];
	vm_memattr_t		pat_mode;
};

struct	pmap {
	struct mtx		pm_mtx;
	pt1_entry_t		*pm_pt1;	/* KVA of pt1 */
	pt2_entry_t		*pm_pt2tab;	/* KVA of pt2 pages table */
	TAILQ_HEAD(,pv_chunk)	pm_pvchunk;	/* list of mappings in pmap */
	cpuset_t		pm_active;	/* active on cpus */
	struct pmap_statistics	pm_stats;	/* pmap statictics */
	LIST_ENTRY(pmap) 	pm_list;	/* List of all pmaps */
};

typedef struct pmap *pmap_t;

#ifdef _KERNEL
extern struct pmap	        kernel_pmap_store;
#define kernel_pmap	        (&kernel_pmap_store)

#define	PMAP_LOCK(pmap)		mtx_lock(&(pmap)->pm_mtx)
#define	PMAP_LOCK_ASSERT(pmap, type) \
				mtx_assert(&(pmap)->pm_mtx, (type))
#define	PMAP_LOCK_DESTROY(pmap)	mtx_destroy(&(pmap)->pm_mtx)
#define	PMAP_LOCK_INIT(pmap)	mtx_init(&(pmap)->pm_mtx, "pmap", \
				    NULL, MTX_DEF | MTX_DUPOK)
#define	PMAP_LOCKED(pmap)	mtx_owned(&(pmap)->pm_mtx)
#define	PMAP_MTX(pmap)		(&(pmap)->pm_mtx)
#define	PMAP_TRYLOCK(pmap)	mtx_trylock(&(pmap)->pm_mtx)
#define	PMAP_UNLOCK(pmap)	mtx_unlock(&(pmap)->pm_mtx)
#endif

/*
 * For each vm_page_t, there is a list of all currently valid virtual
 * mappings of that page.  An entry is a pv_entry_t, the list is pv_list.
 */
typedef struct pv_entry {
	vm_offset_t	pv_va;		/* virtual address for mapping */
	TAILQ_ENTRY(pv_entry)	pv_next;
} *pv_entry_t;

/*
 * pv_entries are allocated in chunks per-process.  This avoids the
 * need to track per-pmap assignments.
 */
#define	_NPCM	11
#define	_NPCPV	336
struct pv_chunk {
	pmap_t			pc_pmap;
	TAILQ_ENTRY(pv_chunk)	pc_list;
	uint32_t		pc_map[_NPCM];	/* bitmap; 1 = free */
	TAILQ_ENTRY(pv_chunk)	pc_lru;
	struct pv_entry		pc_pventry[_NPCPV];
};

#ifdef _KERNEL
extern ttb_entry_t pmap_kern_ttb; 	/* TTB for kernel pmap */

#define	pmap_page_get_memattr(m)	((m)->md.pat_mode)

/*
 * Only the following functions or macros may be used before pmap_bootstrap()
 * is called: pmap_kenter(), pmap_kextract(), pmap_kremove(), vtophys(), and
 * vtopte2().
 */
void pmap_bootstrap(vm_offset_t);
void pmap_kenter(vm_offset_t, vm_paddr_t);
void pmap_kremove(vm_offset_t);
void *pmap_mapdev_attr(vm_paddr_t, vm_size_t, int);
boolean_t pmap_page_is_mapped(vm_page_t);

void pmap_tlb_flush(pmap_t, vm_offset_t);
void pmap_tlb_flush_range(pmap_t, vm_offset_t, vm_size_t);

vm_paddr_t pmap_dump_kextract(vm_offset_t, pt2_entry_t *);

int pmap_fault(pmap_t, vm_offset_t, uint32_t, int, bool);

void pmap_set_tex(void);
void reinit_mmu(ttb_entry_t ttb, u_int aux_clr, u_int aux_set);

/*
 * Pre-bootstrap epoch functions set.
 */
void pmap_bootstrap_prepare(vm_paddr_t);
vm_paddr_t pmap_preboot_get_pages(u_int);
void pmap_preboot_map_pages(vm_paddr_t, vm_offset_t, u_int);
vm_offset_t pmap_preboot_reserve_pages(u_int);
vm_offset_t pmap_preboot_get_vpages(u_int);
void pmap_preboot_map_attr(vm_paddr_t, vm_offset_t, vm_size_t, vm_prot_t,
    vm_memattr_t);

#endif	/* _KERNEL */
#endif	/* !_MACHINE_PMAP_V6_H_ */