1 /* $NetBSD: param.h,v 1.7 2001/01/04 07:03:22 itojun 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. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)param.h 5.8 (Berkeley) 6/28/91 39 */ 40 41 /* 42 * Machine dependent constants for Intel 386. 43 */ 44 45 #ifdef _KERNEL 46 #ifdef _LOCORE 47 #include <machine/psl.h> 48 #else 49 #include <machine/cpu.h> 50 #endif 51 #endif 52 53 #define _MACHINE_ARCH sh3eb 54 #define MACHINE_ARCH "sh3eb" 55 56 #define _MACHINE mmeye 57 #define MACHINE "mmeye" 58 59 #define MID_MACHINE MID_SH3 60 61 /* 62 * Round p (pointer or byte index) up to a correctly-aligned value 63 * for all data types (int, long, ...). The result is u_int and 64 * must be cast to any desired pointer type. 65 * 66 * ALIGNED_POINTER is a boolean macro that checks whether an address 67 * is valid to fetch data elements of type t from on this architecture. 68 * This does not reflect the optimal alignment, just the possibility 69 * (within reasonable limits). 70 * 71 */ 72 #define ALIGNBYTES (sizeof(int) - 1) 73 #define ALIGN(p) (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES) 74 #define ALIGNED_POINTER(p, t) ((((u_long)(p)) & (sizeof(t)-1)) == 0) 75 /* #define ALIGNED_POINTER(p, t) 1 */ 76 77 #define PGSHIFT 12 /* LOG2(NBPG) */ 78 #define NBPG (1 << PGSHIFT) /* bytes/page */ 79 #define PGOFSET (NBPG-1) /* byte offset into page */ 80 #define NPTEPG (NBPG/(sizeof (pt_entry_t))) 81 82 #ifdef _KERNEL 83 #ifndef _LOCORE 84 extern vaddr_t ram_start; 85 #define KERNBASE ram_start /* start of kernel virtual space */ 86 #define KERNTEXTOFF ram_start /* start of kernel text */ 87 #else 88 #define KERNBASE IOM_RAM_BEGIN /* start of kernel virtual space */ 89 #define KERNTEXTOFF IOM_RAM_BEGIN /* start of kernel text */ 90 #endif 91 #endif 92 #define KERNSIZE 0x01800000 /* size of kernel virtual space */ 93 #define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT) 94 95 #define NPGDIR (1*NBPG) 96 #define SYSMAP (5*NBPG) /* page table area offset from _end */ 97 98 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 99 #define DEV_BSIZE (1 << DEV_BSHIFT) 100 #define BLKDEV_IOSIZE 2048 101 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 102 103 #define SSIZE 1 /* initial stack size/NBPG */ 104 #define SINCR 1 /* increment of stack/NBPG */ 105 #if 0 106 #define UPAGES 2 /* pages of u-area */ 107 #else 108 #define UPAGES 4 /* pages of u-area */ 109 #endif 110 #define USPACE (UPAGES * NBPG) /* total size of u-area */ 111 112 #ifndef MSGBUFSIZE 113 #define MSGBUFSIZE NBPG /* default message buffer size */ 114 #endif 115 116 /* 117 * Constants related to network buffer management. 118 * MCLBYTES must be no larger than CLBYTES (the software page size), and, 119 * on machines that exchange pages of input or output buffers with mbuf 120 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 121 * of the hardware page size. 122 */ 123 #define MSIZE 256 /* size of an mbuf */ 124 125 #ifndef MCLSHIFT 126 # define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 127 #endif /* MCLSHIFT */ 128 129 #define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */ 130 #define MCLOFSET (MCLBYTES - 1) /* offset within a m_buf cluster */ 131 132 #ifndef NMBCLUSTERS 133 #ifdef GATEWAY 134 #define NMBCLUSTERS 512 /* map size, max cluster allocation */ 135 #else 136 #define NMBCLUSTERS 256 /* map size, max cluster allocation */ 137 #endif 138 #endif 139 140 /* 141 * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized 142 * logical pages. 143 */ 144 #define NKMEMPAGES_MIN_DEFAULT ((6 * 1024 * 1024) >> PAGE_SHIFT) 145 #define NKMEMPAGES_MAX_DEFAULT ((6 * 1024 * 1024) >> PAGE_SHIFT) 146 147 /* pages ("clicks") to disk blocks */ 148 #define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT)) 149 #define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT)) 150 151 /* bytes to pages */ 152 #define ctob(x) ((x) << PGSHIFT) 153 #define btoc(x) (((x) + PGOFSET) >> PGSHIFT) 154 155 /* bytes to disk blocks */ 156 #define dbtob(x) ((x) << DEV_BSHIFT) 157 #define btodb(x) ((x) >> DEV_BSHIFT) 158 159 /* 160 * Map a ``block device block'' to a file system block. 161 * This should be device dependent, and should use the bsize 162 * field from the disk label. 163 * For now though just use DEV_BSIZE. 164 */ 165 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE / DEV_BSIZE)) 166 167 /* 168 * Mach derived conversion macros 169 */ 170 #define sh3_round_pdr(x) ((((unsigned)(x)) + PDOFSET) & ~PDOFSET) 171 #define sh3_trunc_pdr(x) ((unsigned)(x) & ~PDOFSET) 172 #define sh3_btod(x) ((unsigned)(x) >> PDSHIFT) 173 #define sh3_dtob(x) ((unsigned)(x) << PDSHIFT) 174 #define sh3_round_page(x) ((((unsigned)(x)) + PGOFSET) & ~PGOFSET) 175 #define sh3_trunc_page(x) ((unsigned)(x) & ~PGOFSET) 176 #define sh3_btop(x) ((unsigned)(x) >> PGSHIFT) 177 #define sh3_ptob(x) ((unsigned)(x) << PGSHIFT) 178