1 /* $NetBSD: vmparam.h,v 1.11 2007/10/25 13:03:05 yamt 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 * The Sun2 has 2K pages. Override PAGE_* to be compile-time constants. 50 */ 51 #define PAGE_SHIFT 11 52 #define PAGE_SIZE (1 << PAGE_SHIFT) 53 #define PAGE_MASK (PAGE_SIZE - 1) 54 55 /* 56 * We definitely need a small pager map. 57 */ 58 #define PAGER_MAP_DEFAULT_SIZE (1 * 1024 * 1024) 59 60 /* 61 * USRSTACK is the top (end) of the user stack. 62 */ 63 #define USRSTACK 0x1000000 /* High end of user stack */ 64 65 /* 66 * Virtual memory related constants, all in bytes. 67 * The Sun2 has only 16 MB of user-virtual space, 68 * so we need to be conservative with these limits. 69 */ 70 #ifndef MAXTSIZ 71 #define MAXTSIZ (5*1024*1024) /* max text size */ 72 #endif 73 #ifndef DFLDSIZ 74 #define DFLDSIZ (4*1024*1024) /* initial data size limit */ 75 #endif 76 #ifndef MAXDSIZ 77 #define MAXDSIZ (6*1024*1024) /* max data size */ 78 #endif 79 #ifndef DFLSSIZ 80 #define DFLSSIZ (512*1024) /* initial stack size limit */ 81 #endif 82 #ifndef MAXSSIZ 83 #define MAXSSIZ (4*1024*1024) /* max stack size */ 84 #endif 85 86 /* 87 * PTEs for mapping user space into the kernel for phyio operations. 88 * The actual limitation for physio requests will be the DVMA space, 89 * and that is fixed by hardware design at 256K. We could make the 90 * physio map larger than that, but it would not buy us much. 91 */ 92 #ifndef USRIOSIZE 93 #define USRIOSIZE 128 /* 256K */ 94 #endif 95 96 /* 97 * PTEs for system V style shared memory. 98 * This is basically slop for kmempt which we actually allocate (malloc) from. 99 */ 100 #ifndef SHMMAXPGS 101 #define SHMMAXPGS 512 /* 4 MB */ 102 #endif 103 104 /* 105 * Mach-derived constants: 106 */ 107 108 /* user/kernel map constants */ 109 #define VM_MIN_ADDRESS ((vaddr_t)0) 110 #define VM_MAX_ADDRESS ((vaddr_t)USRSTACK) 111 #define VM_MAXUSER_ADDRESS ((vaddr_t)USRSTACK) 112 #define VM_MIN_KERNEL_ADDRESS ((vaddr_t)KERNBASE) 113 #define VM_MAX_KERNEL_ADDRESS ((vaddr_t)KERN_END) 114 115 /* virtual sizes (bytes) for various kernel submaps */ 116 #define VM_PHYS_SIZE (USRIOSIZE*PAGE_SIZE) 117 118 #define VM_PHYSSEG_STRAT VM_PSTRAT_BSEARCH 119 #define VM_PHYSSEG_NOADD /* can't add RAM after vm_mem_init */ 120 121 #define VM_NFREELIST 1 122 #define VM_FREELIST_DEFAULT 0 123 124 #ifdef _LKM 125 #undef KERNBASE 126 extern char KERNBASE[]; 127 #endif /* _LKM */ 128 129 /* This is needed by some LKMs. */ 130 #define VM_PHYSSEG_MAX 4 131