1 /* $NetBSD: vmparam.h,v 1.7 2001/11/30 17:52:34 fredette 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 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the NetBSD 18 * Foundation, Inc. and its contributors. 19 * 4. Neither the name of The NetBSD Foundation nor the names of its 20 * contributors may be used to endorse or promote products derived 21 * from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 27 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 * POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 /* 37 * Machine dependent constants for Sun2 38 * 39 * The Sun2 has limited total kernel virtual space (14MB) and 40 * can not use main memory for page tables. (All active PTEs 41 * must be installed in special translation RAM in the MMU). 42 * Therefore, parameters that would normally configure the 43 * size of various page tables are irrelevant. Only things 44 * that consume portions of kernel virtual (KV) space matter, 45 * and those things should be chosen to conserve KV space. 46 */ 47 48 /* 49 * We definitely need a small pager map. 50 */ 51 #undef PAGER_MAP_SIZE 52 #define PAGER_MAP_SIZE (1 * 1024 * 1024) 53 54 /* 55 * USRTEXT is the start of the user text/data space, while 56 * USRSTACK is the top (end) of the user stack. 57 */ 58 #define USRTEXT NBPG /* Start of user text */ 59 #define USRSTACK 0x1000000 /* High end of user stack */ 60 61 /* 62 * Virtual memory related constants, all in bytes. 63 * The Sun2 has only 16 MB of user-virtual space, 64 * so we need to be conservative with these limits. 65 */ 66 #ifndef MAXTSIZ 67 #define MAXTSIZ (5*1024*1024) /* max text size */ 68 #endif 69 #ifndef DFLDSIZ 70 #define DFLDSIZ (4*1024*1024) /* initial data size limit */ 71 #endif 72 #ifndef MAXDSIZ 73 #define MAXDSIZ (6*1024*1024) /* max data size */ 74 #endif 75 #ifndef DFLSSIZ 76 #define DFLSSIZ (512*1024) /* initial stack size limit */ 77 #endif 78 #ifndef MAXSSIZ 79 #define MAXSSIZ (4*1024*1024) /* max stack size */ 80 #endif 81 82 /* 83 * PTEs for mapping user space into the kernel for phyio operations. 84 * The actual limitation for physio requests will be the DVMA space, 85 * and that is fixed by hardware design at 256K. We could make the 86 * physio map larger than that, but it would not buy us much. 87 */ 88 #ifndef USRIOSIZE 89 #define USRIOSIZE 128 /* 256K */ 90 #endif 91 92 /* 93 * PTEs for system V style shared memory. 94 * This is basically slop for kmempt which we actually allocate (malloc) from. 95 */ 96 #ifndef SHMMAXPGS 97 #define SHMMAXPGS 512 /* 4 MB */ 98 #endif 99 100 /* 101 * Mach-derived constants: 102 */ 103 104 /* user/kernel map constants */ 105 #define VM_MIN_ADDRESS ((vaddr_t)0) 106 #define VM_MAX_ADDRESS ((vaddr_t)USRSTACK) 107 #define VM_MAXUSER_ADDRESS ((vaddr_t)USRSTACK) 108 #define VM_MIN_KERNEL_ADDRESS ((vaddr_t)KERNBASE) 109 #define VM_MAX_KERNEL_ADDRESS ((vaddr_t)KERN_END) 110 111 /* virtual sizes (bytes) for various kernel submaps */ 112 #define VM_PHYS_SIZE (USRIOSIZE*NBPG) 113 114 #define VM_PHYSSEG_STRAT VM_PSTRAT_BSEARCH 115 #define VM_PHYSSEG_NOADD /* can't add RAM after vm_mem_init */ 116 117 #define VM_NFREELIST 1 118 #define VM_FREELIST_DEFAULT 0 119 120 #ifdef _LKM 121 #undef KERNBASE 122 extern char KERNBASE[]; 123 #endif /* _LKM */ 124 125 /* This is needed by some LKMs. */ 126 #define VM_PHYSSEG_MAX 4 127