1 /* $NetBSD: param.h,v 1.18 2011/02/08 20:20:16 rmind Exp $ */ 2 3 /* 4 * Copyright (c) 1988 University of Utah. 5 * Copyright (c) 1982, 1986, 1990 The Regents of the University of California. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * the Systems Programming Group of the University of Utah Computer 10 * Science Department. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: Utah $Hdr: machparam.h 1.16 92/12/20$ 37 * 38 * @(#)param.h 8.1 (Berkeley) 6/10/93 39 */ 40 41 #ifndef _M68K_PARAM_H_ 42 #define _M68K_PARAM_H_ 43 44 /* 45 * Machine independent constants for m68k 46 */ 47 #ifndef MACHINE_ARCH 48 #define _MACHINE_ARCH m68k 49 #define MACHINE_ARCH "m68k" 50 #endif 51 #ifndef MID_MACHINE 52 #define MID_MACHINE MID_M68K 53 #endif 54 55 /* 56 * Round p (pointer or byte index) up to a correctly-aligned value for all 57 * data types (int, long, ...). The result is u_int and must be cast to 58 * any desired pointer type. 59 * 60 * ALIGNED_POINTER is a boolean macro that checks whether an address 61 * is valid to fetch data elements of type t from on this architecture. 62 * This does not reflect the optimal alignment, just the possibility 63 * (within reasonable limits). 64 * 65 */ 66 #define ALIGNBYTES (sizeof(int) - 1) 67 #define ALIGN(p) (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES) 68 #define ALIGNED_POINTER(p,t) ((((u_long)(p)) & (sizeof(t)-1)) == 0) 69 70 #define NBPG (1 << PGSHIFT) /* bytes/page */ 71 #define PGOFSET (NBPG-1) /* byte offset into page */ 72 73 #define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT) 74 75 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 76 #define DEV_BSIZE (1 << DEV_BSHIFT) 77 #define BLKDEV_IOSIZE 2048 78 #ifndef MAXPHYS 79 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 80 #endif 81 82 #define SSIZE 1 /* initial stack size/NBPG */ 83 #define SINCR 1 /* increment of stack/NBPG */ 84 85 #define USPACE (UPAGES * NBPG) 86 87 #ifndef MSGBUFSIZE 88 #define MSGBUFSIZE NBPG /* default message buffer size */ 89 #endif 90 91 /* 92 * Constants related to network buffer management. 93 * MCLBYTES must be no larger than NBPG (the software page size), and, 94 * on machines that exchange pages of input or output buffers with mbuf 95 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 96 * of the hardware page size. 97 */ 98 #define MSIZE 256 /* size of an mbuf */ 99 100 #ifndef MCLSHIFT 101 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 102 /* 2K cluster can hold Ether frame */ 103 #endif /* MCLSHIFT */ 104 105 #define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */ 106 107 /* 108 * Mach-derived conversion macros 109 */ 110 #define m68k_round_page(x) ((((vaddr_t)(x)) + PGOFSET) & ~PGOFSET) 111 #define m68k_trunc_page(x) ((vaddr_t)(x) & ~PGOFSET) 112 #define m68k_page_offset(x) ((vaddr_t)(x) & PGOFSET) 113 #define m68k_btop(x) ((vaddr_t)(x) >> PGSHIFT) 114 #define m68k_ptob(x) ((vaddr_t)(x) << PGSHIFT) 115 116 #endif /* !_M68K_PARAM_H_ */ 117