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
|
/*
* Copyright (c) 2025 Ian Marco Moffett and L5 engineers
* All rights reserved.
*
* 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 project 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
*/
/*
* Description: Standard CPU MMU interface
* Author: Ian Marco Moffett
*/
#ifndef _MACHINE_MMU_H_
#define _MACHINE_MMU_H_
#include <sys/cpuvar.h>
#include <sys/mman.h>
#include <sys/param.h>
#include <machine/vas.h> /* standard */
#include <vm/vm.h>
/*
* Standard memory protection flags
*/
#define MMU_PROT_NONE 0x0 /* Nothing */
#define MMU_PROT_READ PROT_READ /* Readable */
#define MMU_PROT_WRITE PROT_WRITE /* Writable */
#define MMU_PROT_EXEC PROT_EXEC /* Executable */
#define MMU_PROT_USER PROT_USER /* User visible */
/*
* This will represent a virtual to
* physical address mapping.
*
* @va: Virtual address
* @pa: Physical address
*/
struct mmu_map {
vaddr_t va;
paddr_t pa;
};
/*
* Global early kernel VAS structure used in the
* creation of new virtual address spaces.
*/
extern struct vm_vas g_kvas;
/*
* Initialize arch-specific MMU state such as
* page tables, initial mappings and sanity checks.
*
* Returns zero on success, otherwise a less than zero
* value on failure.
*/
int mmu_init(void);
/*
* Map a single virtual page into physical address
* space.
*
* @spec: Mapping specifier (virtual/physical address)
* @prot: Protection flags for the mapping (see MMU_PROT_*)
*/
int mmu_map_single(struct vm_vas *vas, struct mmu_map *spec, int prot);
/*
* Get a pointer to the current virtual address
* space.
*
* @vasres_p: Resulting VAS is written here
*
* Returns zero on success, otherwise a less than zero
* value on failure.
*/
int mmu_this_vas(struct vm_vas *vasres_p);
/*
* Create a new virtual address structure with a zeroed
* user porition.
*
* Returns zero on success, otherwise a less than zero
* value on failure.
*/
int mmu_new_vas(struct vm_vas *res);
/*
* Apply a virtual address descriptor to the current
* process and flush out the entire TLB
*
* @vas: Virtual address space to switch to
*
* Returns zero on success, otherwise a less than zero
* value to indicate error.
*/
int mmu_write_vas(struct vm_vas *vas);
/*
* Destroy a virtual address space
*
* @vas: VAS to destroy
*
* Returns zero on success, otherwise a less than
* zero value to indicate error.
*/
int mmu_free_vas(struct vm_vas *vas);
#endif /* !_MACHINE_MMU_H_ */
|
