1 /* $NetBSD: vmparam.h,v 1.12 2008/04/28 20:23:37 martin 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 /* 30 * Machine dependent constants for Sun2 31 * 32 * The Sun2 has limited total kernel virtual space (14MB) and 33 * can not use main memory for page tables. (All active PTEs 34 * must be installed in special translation RAM in the MMU). 35 * Therefore, parameters that would normally configure the 36 * size of various page tables are irrelevant. Only things 37 * that consume portions of kernel virtual (KV) space matter, 38 * and those things should be chosen to conserve KV space. 39 */ 40 41 /* 42 * The Sun2 has 2K pages. Override PAGE_* to be compile-time constants. 43 */ 44 #define PAGE_SHIFT 11 45 #define PAGE_SIZE (1 << PAGE_SHIFT) 46 #define PAGE_MASK (PAGE_SIZE - 1) 47 48 /* 49 * We definitely need a small pager map. 50 */ 51 #define PAGER_MAP_DEFAULT_SIZE (1 * 1024 * 1024) 52 53 /* 54 * USRSTACK is the top (end) of the user stack. 55 */ 56 #define USRSTACK 0x1000000 /* High end of user stack */ 57 58 /* 59 * Virtual memory related constants, all in bytes. 60 * The Sun2 has only 16 MB of user-virtual space, 61 * so we need to be conservative with these limits. 62 */ 63 #ifndef MAXTSIZ 64 #define MAXTSIZ (5*1024*1024) /* max text size */ 65 #endif 66 #ifndef DFLDSIZ 67 #define DFLDSIZ (4*1024*1024) /* initial data size limit */ 68 #endif 69 #ifndef MAXDSIZ 70 #define MAXDSIZ (6*1024*1024) /* max data size */ 71 #endif 72 #ifndef DFLSSIZ 73 #define DFLSSIZ (512*1024) /* initial stack size limit */ 74 #endif 75 #ifndef MAXSSIZ 76 #define MAXSSIZ (4*1024*1024) /* max stack size */ 77 #endif 78 79 /* 80 * PTEs for mapping user space into the kernel for phyio operations. 81 * The actual limitation for physio requests will be the DVMA space, 82 * and that is fixed by hardware design at 256K. We could make the 83 * physio map larger than that, but it would not buy us much. 84 */ 85 #ifndef USRIOSIZE 86 #define USRIOSIZE 128 /* 256K */ 87 #endif 88 89 /* 90 * PTEs for system V style shared memory. 91 * This is basically slop for kmempt which we actually allocate (malloc) from. 92 */ 93 #ifndef SHMMAXPGS 94 #define SHMMAXPGS 512 /* 4 MB */ 95 #endif 96 97 /* 98 * Mach-derived constants: 99 */ 100 101 /* user/kernel map constants */ 102 #define VM_MIN_ADDRESS ((vaddr_t)0) 103 #define VM_MAX_ADDRESS ((vaddr_t)USRSTACK) 104 #define VM_MAXUSER_ADDRESS ((vaddr_t)USRSTACK) 105 #define VM_MIN_KERNEL_ADDRESS ((vaddr_t)KERNBASE) 106 #define VM_MAX_KERNEL_ADDRESS ((vaddr_t)KERN_END) 107 108 /* virtual sizes (bytes) for various kernel submaps */ 109 #define VM_PHYS_SIZE (USRIOSIZE*PAGE_SIZE) 110 111 #define VM_PHYSSEG_STRAT VM_PSTRAT_BSEARCH 112 #define VM_PHYSSEG_NOADD /* can't add RAM after vm_mem_init */ 113 114 #define VM_NFREELIST 1 115 #define VM_FREELIST_DEFAULT 0 116 117 #ifdef _LKM 118 #undef KERNBASE 119 extern char KERNBASE[]; 120 #endif /* _LKM */ 121 122 /* This is needed by some LKMs. */ 123 #define VM_PHYSSEG_MAX 4 124