1 /* $NetBSD: param.h,v 1.76 2012/02/10 17:35:49 para Exp $ */ 2 3 /*- 4 * Copyright (c) 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * William Jolitz. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)param.h 5.8 (Berkeley) 6/28/91 35 */ 36 37 #ifndef _I386_PARAM_H_ 38 #define _I386_PARAM_H_ 39 40 /* 41 * Machine dependent constants for Intel 386. 42 */ 43 44 #ifdef _KERNEL 45 #include <machine/cpu.h> 46 #endif 47 48 #define _MACHINE i386 49 #define MACHINE "i386" 50 #define _MACHINE_ARCH i386 51 #define MACHINE_ARCH "i386" 52 #define MID_MACHINE MID_I386 53 54 #define ALIGNED_POINTER(p,t) 1 55 56 #define PGSHIFT 12 /* LOG2(NBPG) */ 57 #define NBPG (1 << PGSHIFT) /* bytes/page */ 58 #define PGOFSET (NBPG-1) /* byte offset into page */ 59 #define NPTEPG (NBPG/(sizeof (pt_entry_t))) 60 61 #if defined(_KERNEL_OPT) 62 #include "opt_kernbase.h" 63 #endif /* defined(_KERNEL_OPT) */ 64 65 #ifdef KERNBASE_LOCORE 66 #error "You should only re-define KERNBASE" 67 #endif 68 69 #ifndef KERNBASE 70 #define KERNBASE 0xc0000000UL /* start of kernel virtual space */ 71 #endif 72 73 #define KERNTEXTOFF (KERNBASE + 0x100000) /* start of kernel text */ 74 #define BTOPKERNBASE (KERNBASE >> PGSHIFT) 75 76 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 77 #define DEV_BSIZE (1 << DEV_BSHIFT) 78 #define BLKDEV_IOSIZE 2048 79 #ifndef MAXPHYS 80 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 81 #endif 82 83 #define SSIZE 1 /* initial stack size/NBPG */ 84 #define SINCR 1 /* increment of stack/NBPG */ 85 86 #ifndef UPAGES 87 # ifdef DIAGNOSTIC 88 # define UPAGES 3 /* 2 + 1 page for redzone */ 89 # else 90 # define UPAGES 2 /* normal pages of u-area */ 91 # endif /* DIAGNOSTIC */ 92 #endif /* !defined(UPAGES) */ 93 #define USPACE (UPAGES * NBPG) /* total size of u-area */ 94 #define INTRSTACKSIZE 8192 95 96 #ifndef MSGBUFSIZE 97 #define MSGBUFSIZE 8*NBPG /* default message buffer size */ 98 #endif 99 100 /* 101 * Constants related to network buffer management. 102 * MCLBYTES must be no larger than NBPG (the software page size), and, 103 * on machines that exchange pages of input or output buffers with mbuf 104 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 105 * of the hardware page size. 106 */ 107 #define MSIZE 256 /* size of an mbuf */ 108 109 #ifndef MCLSHIFT 110 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 111 /* 2K cluster can hold Ether frame */ 112 #endif /* MCLSHIFT */ 113 114 #define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */ 115 116 #ifndef NMBCLUSTERS_MAX 117 #define NMBCLUSTERS_MAX (0x2000000 / MCLBYTES) /* Limit to 64MB for clusters */ 118 #endif 119 120 #ifndef NFS_RSIZE 121 #define NFS_RSIZE 32768 122 #endif 123 #ifndef NFS_WSIZE 124 #define NFS_WSIZE 32768 125 #endif 126 127 /* 128 * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized 129 * logical pages. 130 */ 131 #define NKMEMPAGES_MIN_DEFAULT ((16 * 1024 * 1024) >> PAGE_SHIFT) 132 #define NKMEMPAGES_MAX_DEFAULT ((360 * 1024 * 1024) >> PAGE_SHIFT) 133 134 /* 135 * Mach derived conversion macros 136 */ 137 #define x86_round_pdr(x) \ 138 ((((unsigned long)(x)) + (NBPD_L2 - 1)) & ~(NBPD_L2 - 1)) 139 #define x86_trunc_pdr(x) ((unsigned long)(x) & ~(NBPD_L2 - 1)) 140 #define x86_btod(x) ((unsigned long)(x) >> L2_SHIFT) 141 #define x86_dtob(x) ((unsigned long)(x) << L2_SHIFT) 142 #define x86_round_page(x) ((((paddr_t)(x)) + PGOFSET) & ~PGOFSET) 143 #define x86_trunc_page(x) ((paddr_t)(x) & ~PGOFSET) 144 #define x86_btop(x) ((paddr_t)(x) >> PGSHIFT) 145 #define x86_ptob(x) ((paddr_t)(x) << PGSHIFT) 146 147 #endif /* _I386_PARAM_H_ */ 148