param.h revision 1.7
1/* $NetBSD: param.h,v 1.7 2003/11/09 08:27:19 scw Exp $ */ 2 3/* 4 * Copyright (c) 1994,1995 Mark Brinicombe. 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 RiscBSD team. 18 * 4. The name "RiscBSD" nor the name of the author may be used to 19 * endorse or promote products derived from this software without specific 20 * prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY RISCBSD ``AS IS'' AND ANY EXPRESS OR IMPLIED 23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL RISCBSD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 26 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 27 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 28 * 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 35#ifndef _ARM_PARAM_H_ 36#define _ARM_PARAM_H_ 37 38/* 39 * Machine dependent constants for all ARM processors 40 */ 41 42/* 43 * For KERNEL code: 44 * MACHINE must be defined by the individual port. This is so that 45 * uname returns the correct thing, etc. 46 * 47 * MACHINE_ARCH may be defined by individual ports as a temporary 48 * measure while we're finishing the conversion to ELF. 49 * 50 * For non-KERNEL code: 51 * If ELF, MACHINE and MACHINE_ARCH are forced to "arm". 52 */ 53 54#if defined(_KERNEL) 55#ifndef MACHINE_ARCH /* XXX For now */ 56#ifndef __ARMEB__ 57#define _MACHINE_ARCH arm 58#define MACHINE_ARCH "arm" 59#else 60#define _MACHINE_ARCH armeb 61#define MACHINE_ARCH "armeb" 62#endif /* __ARMEB__ */ 63#elif defined(__ELF__) 64#undef _MACHINE 65#undef MACHINE 66#undef _MACHINE_ARCH 67#undef MACHINE_ARCH 68#define _MACHINE arm 69#define MACHINE "arm" 70#ifndef __ARMEB__ 71#define _MACHINE_ARCH arm 72#define MACHINE_ARCH "arm" 73#else 74#define _MACHINE_ARCH armeb 75#define MACHINE_ARCH "armeb" 76#endif /* __ARMEB__ */ 77#endif /* __ELF__ */ 78#endif /* _KERNEL */ 79 80#define MID_MACHINE MID_ARM6 81 82/* 83 * Round p (pointer or byte index) up to a correctly-aligned value 84 * for all data types (int, long, ...). The result is u_int and 85 * must be cast to any desired pointer type. 86 * 87 * ALIGNED_POINTER is a boolean macro that checks whether an address 88 * is valid to fetch data elements of type t from on this architecture. 89 * This does not reflect the optimal alignment, just the possibility 90 * (within reasonable limits). 91 * 92 */ 93#define ALIGNBYTES (sizeof(int) - 1) 94#define ALIGN(p) (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES) 95#define ALIGNED_POINTER(p,t) ((((u_long)(p)) & (sizeof(t)-1)) == 0) 96/* ARM-specific macro to align a stack pointer (downwards). */ 97#define STACKALIGNBYTES (8 - 1) 98#define STACKALIGN(p) ((u_int)(p) &~ STACKALIGNBYTES) 99 100#define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 101#define DEV_BSIZE (1 << DEV_BSHIFT) 102#define BLKDEV_IOSIZE 2048 103 104#ifndef MAXPHYS 105#define MAXPHYS 65536 /* max I/O transfer size */ 106#endif 107 108/* pages ("clicks") to disk blocks */ 109#define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT)) 110#define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT)) 111/*#define dtob(x) ((x) << DEV_BSHIFT)*/ 112 113#define ctob(x) ((x) << PGSHIFT) 114 115/* bytes to pages */ 116#define btoc(x) (((x) + PGOFSET) >> PGSHIFT) 117 118#define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 119 ((bytes) >> DEV_BSHIFT) 120#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 121 ((db) << DEV_BSHIFT) 122 123/* 124 * Map a ``block device block'' to a file system block. 125 * This should be device dependent, and should use the bsize 126 * field from the disk label. 127 * For now though just use DEV_BSIZE. 128 */ 129#define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE / DEV_BSIZE)) 130 131/* 132 * Constants related to network buffer management. 133 * MCLBYTES must be no larger than NBPG (the software page size), and, 134 * on machines that exchange pages of input or output buffers with mbuf 135 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 136 * of the hardware page size. 137 */ 138#define MSIZE 256 /* size of an mbuf */ 139 140#ifndef MCLSHIFT 141#define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 142 /* 2K cluster can hold Ether frame */ 143#endif /* MCLSHIFT */ 144 145#define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */ 146 147#endif /* _ARM_PARAM_H_ */ 148