1 /* $NetBSD: vmparam.h,v 1.8 2002/12/10 05:14:35 thorpej 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 * USRSTACK is the top (end) of the user stack. 56 */ 57 #define USRSTACK 0x1000000 /* High end of user stack */ 58 59 /* 60 * Virtual memory related constants, all in bytes. 61 * The Sun2 has only 16 MB of user-virtual space, 62 * so we need to be conservative with these limits. 63 */ 64 #ifndef MAXTSIZ 65 #define MAXTSIZ (5*1024*1024) /* max text size */ 66 #endif 67 #ifndef DFLDSIZ 68 #define DFLDSIZ (4*1024*1024) /* initial data size limit */ 69 #endif 70 #ifndef MAXDSIZ 71 #define MAXDSIZ (6*1024*1024) /* max data size */ 72 #endif 73 #ifndef DFLSSIZ 74 #define DFLSSIZ (512*1024) /* initial stack size limit */ 75 #endif 76 #ifndef MAXSSIZ 77 #define MAXSSIZ (4*1024*1024) /* max stack size */ 78 #endif 79 80 /* 81 * PTEs for mapping user space into the kernel for phyio operations. 82 * The actual limitation for physio requests will be the DVMA space, 83 * and that is fixed by hardware design at 256K. We could make the 84 * physio map larger than that, but it would not buy us much. 85 */ 86 #ifndef USRIOSIZE 87 #define USRIOSIZE 128 /* 256K */ 88 #endif 89 90 /* 91 * PTEs for system V style shared memory. 92 * This is basically slop for kmempt which we actually allocate (malloc) from. 93 */ 94 #ifndef SHMMAXPGS 95 #define SHMMAXPGS 512 /* 4 MB */ 96 #endif 97 98 /* 99 * Mach-derived constants: 100 */ 101 102 /* user/kernel map constants */ 103 #define VM_MIN_ADDRESS ((vaddr_t)0) 104 #define VM_MAX_ADDRESS ((vaddr_t)USRSTACK) 105 #define VM_MAXUSER_ADDRESS ((vaddr_t)USRSTACK) 106 #define VM_MIN_KERNEL_ADDRESS ((vaddr_t)KERNBASE) 107 #define VM_MAX_KERNEL_ADDRESS ((vaddr_t)KERN_END) 108 109 /* virtual sizes (bytes) for various kernel submaps */ 110 #define VM_PHYS_SIZE (USRIOSIZE*NBPG) 111 112 #define VM_PHYSSEG_STRAT VM_PSTRAT_BSEARCH 113 #define VM_PHYSSEG_NOADD /* can't add RAM after vm_mem_init */ 114 115 #define VM_NFREELIST 1 116 #define VM_FREELIST_DEFAULT 0 117 118 #ifdef _LKM 119 #undef KERNBASE 120 extern char KERNBASE[]; 121 #endif /* _LKM */ 122 123 /* This is needed by some LKMs. */ 124 #define VM_PHYSSEG_MAX 4 125