1/* $OpenBSD: vmparam.h,v 1.9 2023/11/28 09:10:18 jsg Exp $ */
2
3/*-
4 * Copyright (c) 1990 The Regents of the University of California.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * William Jolitz.
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. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * @(#)vmparam.h 5.9 (Berkeley) 5/12/91
35 */
36
37#ifndef _MACHINE_VMPARAM_H_
38#define _MACHINE_VMPARAM_H_
39
40/*
41 * Machine dependent constants for riscv64.
42 */
43
44#define USRSTACK VM_MAXUSER_ADDRESS
45
46/*
47 * Virtual memory related constants, all in bytes
48 */
49#ifndef MAXTSIZ
50#define MAXTSIZ ((paddr_t)1*1024*1024*1024) /* max text size */
51#endif
52#ifndef DFLDSIZ
53#define DFLDSIZ ((paddr_t)128*1024*1024) /* initial data size limit */
54#endif
55#ifndef MAXDSIZ
56#define MAXDSIZ ((paddr_t)16*1024*1024*1024) /* max data size */
57#endif
58#ifndef BRKSIZ
59#define BRKSIZ ((paddr_t)1*1024*1024*1024) /* heap gap size */
60#endif
61#ifndef DFLSSIZ
62#define DFLSSIZ ((paddr_t)128*1024*1024) /* initial stack size limit */
63#endif
64#ifndef MAXSSIZ
65#define MAXSSIZ ((paddr_t)1*1024*1024*1024) /* max stack size */
66#endif
67
68#define STACKGAP_RANDOM 256*1024
69
70/*
71 * Size of shared memory map
72 */
73#ifndef SHMMAXPGS
74#define SHMMAXPGS 1024
75#endif
76
77/*
78 * Size of User Raw I/O map
79 */
80#define USRIOSIZE 300
81
82/**
83 * Address space layout.
84 *
85 * RISC-V implements multiple paging modes with different virtual address space
86 * sizes: SV32, SV39 and SV48. SV39 permits a virtual address space size of
87 * 512GB and uses a three-level page table. Since this is large enough for most
88 * purposes, we currently use SV39 for both userland and the kernel, avoiding
89 * the extra translation step required by SV48.
90 *
91 * The address space is split into two regions at each end of the 64-bit address
92 * space:
93 *
94 * 0x0000000000000000 - 0x0000003fffffffff 256GB user map
95 * 0x0000004000000000 - 0xffffffbfffffffff unmappable
96 * 0xffffffc000000000 - 0xffffffc7ffffffff 32GB kernel map
97 * 0xffffffc800000000 - 0xffffffcfffffffff 32GB unused
98 * 0xffffffd000000000 - 0xffffffefffffffff 128GB direct map
99 * 0xfffffff000000000 - 0xffffffffffffffff 64GB unused
100 *
101 * The kernel is loaded at the beginning of the kernel map.
102 *
103 * We define some interesting address constants:
104 *
105 * VM_MIN_ADDRESS and VM_MAX_ADDRESS define the start and end of the entire
106 * 64 bit address space, mostly just for convenience.
107 *
108 * VM_MIN_KERNEL_ADDRESS and VM_MAX_KERNEL_ADDRESS define the start and end of
109 * mappable kernel virtual address space.
110 *
111 * VM_MIN_ADDRESS and VM_MAXUSER_ADDRESS define the start and end of the
112 * user address space.
113 */
114#define VM_MIN_ADDRESS ((vaddr_t)PAGE_SIZE)
115#define VM_MAX_ADDRESS (0xffffffffffffffffUL)
116
117#define VM_MIN_KERNEL_ADDRESS (0xffffffc000000000UL)
118#define VM_MAX_KERNEL_ADDRESS (0xffffffc800000000UL)
119
120/* Kernel L1 Page Table Range */
121#define L1_KERN_BASE (256)
122#define L1_KERN_ENTRIES (288 - L1_KERN_BASE)
123
124#define DMAP_MIN_ADDRESS (0xffffffd000000000UL)
125#define DMAP_MAX_ADDRESS (0xfffffff000000000UL)
126
127/* DMAP L1 Page Table Range */
128#define L1_DMAP_BASE (320)
129#define L1_DMAP_ENTRIES (448 - L1_DMAP_BASE)
130
131#define VM_MAXUSER_ADDRESS (0x0000004000000000UL) /* 39 bits */
132
133#ifdef _KERNEL
134#define VM_MIN_STACK_ADDRESS (VM_MAXUSER_ADDRESS * 3 / 4)
135#endif
136
137#define KERNBASE (VM_MIN_KERNEL_ADDRESS)
138
139#ifndef _LOCORE
140extern paddr_t dmap_phys_base;
141#endif
142
143/* virtual sizes (bytes) for various kernel submaps */
144#define VM_PHYS_SIZE (USRIOSIZE*PAGE_SIZE)
145
146#define VM_PHYSSEG_MAX 32
147#define VM_PHYSSEG_STRAT VM_PSTRAT_BSEARCH
148#define VM_PHYSSEG_NOADD /* can't add RAM after vm_mem_init */
149
150#endif /* _MACHINE_VMPARAM_H_ */