1 /* $NetBSD: param.h,v 1.1 2000/12/11 18:19:15 marcus 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 #ifndef _DREAMCAST_PARAM_H_ 46 #define _DREAMCAST_PARAM_H_ 47 48 #ifdef _KERNEL 49 #ifdef _LOCORE 50 #include <machine/psl.h> 51 #else 52 #include <machine/cpu.h> 53 #endif 54 #endif 55 56 #define _MACHINE dreamcast 57 #define MACHINE "dreamcast" 58 59 60 #if 1 61 #define _MACHINE_ARCH sh3 62 #define MACHINE_ARCH "sh3" 63 #define MID_MACHINE MID_SH3 64 #else /* XXX (msaioth) */ 65 #include <sh3/param.h> 66 #endif 67 68 /* 69 * Round p (pointer or byte index) up to a correctly-aligned value 70 * for all data types (int, long, ...). The result is u_int and 71 * must be cast to any desired pointer type. 72 * 73 * ALIGNED_POINTER is a boolean macro that checks whether an address 74 * is valid to fetch data elements of type t from on this architecture. 75 * This does not reflect the optimal alignment, just the possibility 76 * (within reasonable limits). 77 * 78 */ 79 #define ALIGNBYTES (sizeof(int) - 1) 80 #define ALIGN(p) (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES) 81 #define ALIGNED_POINTER(p, t) ((((u_long)(p)) & (sizeof(t)-1)) == 0) 82 /* #define ALIGNED_POINTER(p, t) 1 */ 83 84 #define PGSHIFT 12 /* LOG2(NBPG) */ 85 #define NBPG (1 << PGSHIFT) /* bytes/page */ 86 #define PGOFSET (NBPG-1) /* byte offset into page */ 87 #define NPTEPG (NBPG/(sizeof (pt_entry_t))) 88 89 #ifdef _KERNEL 90 #ifndef _LOCORE 91 extern vaddr_t ram_start; 92 #define KERNBASE ram_start /* start of kernel virtual space */ 93 #define KERNTEXTOFF ram_start /* start of kernel text */ 94 #else 95 #define KERNBASE IOM_RAM_BEGIN /* start of kernel virtual space */ 96 #define KERNTEXTOFF IOM_RAM_BEGIN /* start of kernel text */ 97 #endif 98 #endif 99 #define KERNSIZE 0x01800000 /* size of kernel virtual space */ 100 #define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT) 101 102 #define NPGDIR (1*NBPG) 103 #define SYSMAP (5*NBPG) /* page table area offset from _end */ 104 105 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 106 #define DEV_BSIZE (1 << DEV_BSHIFT) 107 #define BLKDEV_IOSIZE 2048 108 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 109 110 #define SSIZE 1 /* initial stack size/NBPG */ 111 #define SINCR 1 /* increment of stack/NBPG */ 112 #if 0 113 #define UPAGES 2 /* pages of u-area */ 114 #else 115 #define UPAGES 4 /* pages of u-area */ 116 #endif 117 #define USPACE (UPAGES * NBPG) /* total size of u-area */ 118 119 #ifndef MSGBUFSIZE 120 #define MSGBUFSIZE NBPG /* default message buffer size */ 121 #endif 122 123 /* 124 * Constants related to network buffer management. 125 * MCLBYTES must be no larger than CLBYTES (the software page size), and, 126 * on machines that exchange pages of input or output buffers with mbuf 127 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 128 * of the hardware page size. 129 */ 130 #define MSIZE 256 /* size of an mbuf */ 131 132 #ifndef MCLSHIFT 133 # define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 134 #endif /* MCLSHIFT */ 135 136 #define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */ 137 #define MCLOFSET (MCLBYTES - 1) /* offset within a m_buf cluster */ 138 139 #ifndef NMBCLUSTERS 140 #ifdef GATEWAY 141 #define NMBCLUSTERS 512 /* map size, max cluster allocation */ 142 #else 143 #define NMBCLUSTERS 256 /* map size, max cluster allocation */ 144 #endif 145 #endif 146 147 /* 148 * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized 149 * logical pages. 150 */ 151 #define NKMEMPAGES_MIN_DEFAULT ((6 * 1024 * 1024) >> PAGE_SHIFT) 152 #define NKMEMPAGES_MAX_DEFAULT ((6 * 1024 * 1024) >> PAGE_SHIFT) 153 154 /* pages ("clicks") to disk blocks */ 155 #define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT)) 156 #define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT)) 157 158 /* bytes to pages */ 159 #define ctob(x) ((x) << PGSHIFT) 160 #define btoc(x) (((x) + PGOFSET) >> PGSHIFT) 161 162 /* bytes to disk blocks */ 163 #define dbtob(x) ((x) << DEV_BSHIFT) 164 #define btodb(x) ((x) >> DEV_BSHIFT) 165 166 /* 167 * Map a ``block device block'' to a file system block. 168 * This should be device dependent, and should use the bsize 169 * field from the disk label. 170 * For now though just use DEV_BSIZE. 171 */ 172 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE / DEV_BSIZE)) 173 174 /* 175 * Mach derived conversion macros 176 */ 177 #define sh3_round_pdr(x) ((((unsigned)(x)) + PDOFSET) & ~PDOFSET) 178 #define sh3_trunc_pdr(x) ((unsigned)(x) & ~PDOFSET) 179 #define sh3_btod(x) ((unsigned)(x) >> PDSHIFT) 180 #define sh3_dtob(x) ((unsigned)(x) << PDSHIFT) 181 #define sh3_round_page(x) ((((unsigned)(x)) + PGOFSET) & ~PGOFSET) 182 #define sh3_trunc_page(x) ((unsigned)(x) & ~PGOFSET) 183 #define sh3_btop(x) ((unsigned)(x) >> PGSHIFT) 184 #define sh3_ptob(x) ((unsigned)(x) << PGSHIFT) 185 186 #endif /* _DREAMCAST_PARAM_H_ */ 187