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 140 extern 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_ */ 151