1/* $NetBSD: vmparam.h,v 1.16 2020/08/10 10:59:33 rin Exp $ */ 2 3/*- 4 * Copyright (c) 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29#define __USE_TOPDOWN_VM 30 31/* 32 * Machine dependent constants for Sun2 33 * 34 * The Sun2 has limited total kernel virtual space (14MB) and 35 * can not use main memory for page tables. (All active PTEs 36 * must be installed in special translation RAM in the MMU). 37 * Therefore, parameters that would normally configure the 38 * size of various page tables are irrelevant. Only things 39 * that consume portions of kernel virtual (KV) space matter, 40 * and those things should be chosen to conserve KV space. 41 */ 42 43/* 44 * The Sun2 has 2K pages. Override PAGE_* to be compile-time constants. 45 */ 46#define PAGE_SHIFT 11 47#define PAGE_SIZE (1 << PAGE_SHIFT) 48#define PAGE_MASK (PAGE_SIZE - 1) 49 50/* 51 * We definitely need a small pager map. 52 */ 53#define PAGER_MAP_DEFAULT_SIZE (1 * 1024 * 1024) 54 55/* 56 * USRSTACK is the top (end) of the user stack. 57 */ 58#define USRSTACK 0x1000000 /* High end of user stack */ 59 60/* 61 * Virtual memory related constants, all in bytes. 62 * The Sun2 has only 16 MB of user-virtual space, 63 * so we need to be conservative with these limits. 64 */ 65#ifndef MAXTSIZ 66#define MAXTSIZ (5*1024*1024) /* max text size */ 67#endif 68#ifndef DFLDSIZ 69#define DFLDSIZ (4*1024*1024) /* initial data size limit */ 70#endif 71#ifndef MAXDSIZ 72#define MAXDSIZ (6*1024*1024) /* max data size */ 73#endif 74#ifndef DFLSSIZ 75#define DFLSSIZ (512*1024) /* initial stack size limit */ 76#endif 77#ifndef MAXSSIZ 78#define MAXSSIZ (4*1024*1024) /* max stack size */ 79#endif 80 81/* 82 * PTEs for mapping user space into the kernel for phyio operations. 83 * The actual limitation for physio requests will be the DVMA space, 84 * and that is fixed by hardware design at 256K. We could make the 85 * physio map larger than that, but it would not buy us much. 86 */ 87#ifndef USRIOSIZE 88#define USRIOSIZE 128 /* 256K */ 89#endif 90 91/* 92 * Mach-derived constants: 93 */ 94 95/* user/kernel map constants */ 96#define VM_MIN_ADDRESS ((vaddr_t)0) 97#define VM_MAX_ADDRESS ((vaddr_t)USRSTACK) 98#define VM_MAXUSER_ADDRESS ((vaddr_t)USRSTACK) 99#define VM_MIN_KERNEL_ADDRESS ((vaddr_t)KERNBASE) 100#define VM_MAX_KERNEL_ADDRESS ((vaddr_t)KERN_END) 101 102/* virtual sizes (bytes) for various kernel submaps */ 103#define VM_PHYS_SIZE (USRIOSIZE*PAGE_SIZE) 104 105#define VM_PHYSSEG_STRAT VM_PSTRAT_BSEARCH 106 107#define VM_NFREELIST 1 108#define VM_FREELIST_DEFAULT 0 109 110#ifdef _MODULE 111#undef KERNBASE 112extern char KERNBASE[]; 113#endif /* _MODULE */ 114 115/* This is needed by some LKMs. */ 116#define VM_PHYSSEG_MAX 4 117