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
195
196
|
/* $OpenBSD: vmparam.h,v 1.5 2021/07/02 10:42:22 kettenis Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* 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 University 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 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.
*
* @(#)vmparam.h 5.9 (Berkeley) 5/12/91
*/
#ifndef _MACHINE_VMPARAM_H_
#define _MACHINE_VMPARAM_H_
/*
* Machine dependent constants for riscv64.
*/
#define USRSTACK VM_MAXUSER_ADDRESS
/*
* Virtual memory related constants, all in bytes
*/
#ifndef MAXTSIZ
#define MAXTSIZ ((paddr_t)1*1024*1024*1024) /* max text size */
#endif
#ifndef DFLDSIZ
#define DFLDSIZ ((paddr_t)128*1024*1024) /* initial data size limit */
#endif
#ifndef MAXDSIZ
#define MAXDSIZ ((paddr_t)16*1024*1024*1024) /* max data size */
#endif
#ifndef BRKSIZ
#define BRKSIZ ((paddr_t)1*1024*1024*1024) /* heap gap size */
#endif
#ifndef DFLSSIZ
#define DFLSSIZ ((paddr_t)128*1024*1024) /* initial stack size limit */
#endif
#ifndef MAXSSIZ
#define MAXSSIZ ((paddr_t)1*1024*1024*1024) /* max stack size */
#endif
#define STACKGAP_RANDOM 256*1024
/*
* Size of shared memory map
*/
#ifndef SHMMAXPGS
#define SHMMAXPGS 1024
#endif
/*
* Size of User Raw I/O map
*/
#define USRIOSIZE 300
/**
* Address space layout.
*
* RISC-V implements multiple paging modes with different virtual address space
* sizes: SV32, SV39 and SV48. SV39 permits a virtual address space size of
* 512GB and uses a three-level page table. Since this is large enough for most
* purposes, we currently use SV39 for both userland and the kernel, avoiding
* the extra translation step required by SV48.
*
* The address space is split into two regions at each end of the 64-bit address
* space:
*
* 0x0000000000000000 - 0x0000003fffffffff 256GB user map
* 0x0000004000000000 - 0xffffffbfffffffff unmappable
* 0xffffffc000000000 - 0xffffffc7ffffffff 32GB kernel map
* 0xffffffc800000000 - 0xffffffcfffffffff 32GB unused
* 0xffffffd000000000 - 0xffffffefffffffff 128GB direct map
* 0xfffffff000000000 - 0xffffffffffffffff 64GB unused
*
* The kernel is loaded at the beginning of the kernel map.
*
* We define some interesting address constants:
*
* VM_MIN_ADDRESS and VM_MAX_ADDRESS define the start and end of the entire
* 64 bit address space, mostly just for convenience.
*
* VM_MIN_KERNEL_ADDRESS and VM_MAX_KERNEL_ADDRESS define the start and end of
* mappable kernel virtual address space.
*
* VM_MIN_USER_ADDRESS and VM_MAX_USER_ADDRESS define the start and end of the
* user address space.
*/
// XXX OpenBSD/arm64 starts VM_MIN_ADDRESS from PAGE_SIZE. Why?
#define VM_MIN_ADDRESS (0x0000000000000000UL)
#define VM_MAX_ADDRESS (0xffffffffffffffffUL)
#define VM_MIN_KERNEL_ADDRESS (0xffffffc000000000UL)
#define VM_MAX_KERNEL_ADDRESS (0xffffffc800000000UL)
// Kernel L1 Page Table Range
#define L1_KERN_BASE (256)
#define L1_KERN_ENTRIES (288 - L1_KERN_BASE)
#define DMAP_MIN_ADDRESS (0xffffffd000000000UL)
#define DMAP_MAX_ADDRESS (0xfffffff000000000UL)
// DMAP L1 Page Table Range
#define L1_DMAP_BASE (320)
#define L1_DMAP_ENTRIES (448 - L1_DMAP_BASE)
#define DMAP_MIN_PHYSADDR (dmap_phys_base)
#define DMAP_MAX_PHYSADDR (dmap_phys_max)
/* True if pa is in the dmap range */
#define PHYS_IN_DMAP(pa) ((pa) >= DMAP_MIN_PHYSADDR && \
(pa) < DMAP_MAX_PHYSADDR)
/* True if va is in the dmap range */
#define VIRT_IN_DMAP(va) ((va) >= DMAP_MIN_ADDRESS && \
(va) < (dmap_max_addr))
#define PMAP_HAS_DMAP 1
#if 0 // XXX KASSERT missing. Find a better way to enforce boundary.
#define PHYS_TO_DMAP(pa) \
({ \
KASSERT(PHYS_IN_DMAP(pa), \
("%s: PA out of range, PA: 0x%lx", __func__, \
(vm_paddr_t)(pa))); \
((pa) - dmap_phys_base) + DMAP_MIN_ADDRESS; \
})
#else
#define PHYS_TO_DMAP(pa) \
({ \
((pa) - dmap_phys_base) + DMAP_MIN_ADDRESS; \
})
#endif
#if 0 // XXX KASSERT missing. Find a better way to enforce boundary.
#define DMAP_TO_PHYS(va) \
({ \
KASSERT(VIRT_IN_DMAP(va), \
("%s: VA out of range, VA: 0x%lx", __func__, \
(vm_offset_t)(va))); \
((va) - DMAP_MIN_ADDRESS) + dmap_phys_base; \
})
#else
#define DMAP_TO_PHYS(va) \
({ \
((va) - DMAP_MIN_ADDRESS) + dmap_phys_base; \
})
#endif
#define VM_MIN_USER_ADDRESS (0x0000000000000000UL)
#define VM_MAX_USER_ADDRESS (0x0000004000000000UL) // 39 User Space Bits
#define VM_MINUSER_ADDRESS (VM_MIN_USER_ADDRESS)
// XXX OpenBSD/arm64 saves 8 * PAGE_SIZE at top of VM_MAXUSER_ADDRESS. Why?
#define VM_MAXUSER_ADDRESS (VM_MAX_USER_ADDRESS)
#define KERNBASE (VM_MIN_KERNEL_ADDRESS)
#ifndef _LOCORE
extern paddr_t dmap_phys_base;
extern paddr_t dmap_phys_max;
extern vaddr_t dmap_virt_max;
extern vaddr_t vm_max_kernel_address;
#endif
/* virtual sizes (bytes) for various kernel submaps */
#define VM_PHYS_SIZE (USRIOSIZE*PAGE_SIZE)
#define VM_PHYSSEG_MAX 32
#define VM_PHYSSEG_STRAT VM_PSTRAT_BSEARCH
#define VM_PHYSSEG_NOADD /* can't add RAM after vm_mem_init */
#endif /* _MACHINE_VMPARAM_H_ */
|
