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 112 extern char KERNBASE[]; 113 #endif /* _MODULE */ 114 115 /* This is needed by some LKMs. */ 116 #define VM_PHYSSEG_MAX 4 117