1 /* $NetBSD: vmparam.h,v 1.81 2014/07/24 13:42:28 riastradh 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 _I386_VMPARAM_H_ 38 #define _I386_VMPARAM_H_ 39 40 #include <sys/tree.h> 41 #include <sys/mutex.h> 42 43 /* 44 * Machine dependent constants for 386. 45 */ 46 47 /* 48 * Page size on the IA-32 is not variable in the traditional sense. 49 * We override the PAGE_* definitions to compile-time constants. 50 */ 51 #define PAGE_SHIFT 12 52 #define PAGE_SIZE (1 << PAGE_SHIFT) 53 #define PAGE_MASK (PAGE_SIZE - 1) 54 55 /* 56 * Virtual address space arrangement. On 386, both user and kernel 57 * share the address space, not unlike the vax. 58 * USRSTACK is the top (end) of the user stack. Immediately above the 59 * user stack is the page table map, and then kernel address space. 60 */ 61 #define USRSTACK VM_MAXUSER_ADDRESS 62 63 /* 64 * Virtual memory related constants, all in bytes 65 */ 66 #define MAXTSIZ (256*1024*1024) /* max text size */ 67 #ifndef DFLDSIZ 68 #define DFLDSIZ (256*1024*1024) /* initial data size limit */ 69 #endif 70 #ifndef MAXDSIZ 71 #define MAXDSIZ (3U*1024*1024*1024) /* 3G max data size */ 72 #endif 73 #ifndef MAXDSIZ_BU 74 #define MAXDSIZ_BU (2U*1024*1024*1024 + /* 2.5G max data size for */ \ 75 1U* 512*1024*1024) /* bottom-up allocation */ \ 76 /* could be a bit more */ 77 #endif 78 #ifndef DFLSSIZ 79 #define DFLSSIZ (2*1024*1024) /* initial stack size limit */ 80 #endif 81 #ifndef MAXSSIZ 82 #define MAXSSIZ (64*1024*1024) /* max stack size */ 83 #endif 84 85 /* 86 * IA-32 can't do per-page execute permission, so instead we implement 87 * two executable segments for %cs, one that covers everything and one 88 * that excludes some of the address space (currently just the stack). 89 * I386_MAX_EXE_ADDR is the upper boundary for the smaller segment. 90 */ 91 #define I386_MAX_EXE_ADDR (USRSTACK - MAXSSIZ) 92 93 /* 94 * Size of User Raw I/O map 95 */ 96 #define USRIOSIZE 300 97 98 /* 99 * Mach derived constants 100 */ 101 102 /* user/kernel map constants */ 103 #define VM_MIN_ADDRESS ((vaddr_t)0) 104 #define VM_MAXUSER_ADDRESS ((vaddr_t)(PDIR_SLOT_PTE << L2_SHIFT)) 105 #define VM_MAX_ADDRESS \ 106 ((vaddr_t)((PDIR_SLOT_PTE << L2_SHIFT) + (PDIR_SLOT_PTE << L1_SHIFT))) 107 #define VM_MIN_KERNEL_ADDRESS ((vaddr_t)(PDIR_SLOT_KERN << L2_SHIFT)) 108 #define VM_MAX_KERNEL_ADDRESS ((vaddr_t)((PDIR_SLOT_KERN + NKL2_MAX_ENTRIES) << L2_SHIFT)) 109 110 /* 111 * The address to which unspecified mapping requests default 112 */ 113 #ifdef _KERNEL_OPT 114 #include "opt_uvm.h" 115 #include "opt_xen.h" 116 #endif 117 #define __USE_TOPDOWN_VM 118 #define VM_DEFAULT_ADDRESS_TOPDOWN(da, sz) \ 119 trunc_page(USRSTACK - MAXSSIZ - (sz)) 120 #define VM_DEFAULT_ADDRESS_BOTTOMUP(da, sz) \ 121 round_page((vaddr_t)(da) + (vsize_t)MIN(maxdmap, MAXDSIZ_BU)) 122 123 /* XXX max. amount of KVM to be used by buffers. */ 124 #ifndef VM_MAX_KERNEL_BUF 125 #define VM_MAX_KERNEL_BUF (384 * 1024 * 1024) 126 #endif 127 128 /* virtual sizes (bytes) for various kernel submaps */ 129 #define VM_PHYS_SIZE (USRIOSIZE*PAGE_SIZE) 130 131 #define VM_PHYSSEG_STRAT VM_PSTRAT_BIGFIRST 132 133 #ifdef XEN 134 #define VM_PHYSSEG_MAX 1 135 #define VM_NFREELIST 1 136 #else 137 #define VM_PHYSSEG_MAX 32 /* 1 "hole" + 31 free lists */ 138 #define VM_NFREELIST 4 139 #define VM_FREELIST_FIRST16 3 140 #define VM_FREELIST_FIRST1G 2 141 #define VM_FREELIST_FIRST4G 1 142 #endif /* XEN */ 143 #define VM_FREELIST_DEFAULT 0 144 145 #endif /* _I386_VMPARAM_H_ */ 146