1 /* $NetBSD: param.h,v 1.6 2002/02/26 15:13:20 simonb 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 #define _MACHINE_ARCH arm 57 #define MACHINE_ARCH "arm" 58 #endif 59 #elif defined(__ELF__) 60 #undef _MACHINE 61 #define _MACHINE arm 62 #undef MACHINE 63 #define MACHINE "arm" 64 65 #undef _MACHINE_ARCH 66 #define _MACHINE_ARCH arm 67 #undef MACHINE_ARCH 68 #define MACHINE_ARCH "arm" 69 #endif /* _KERNEL */ 70 71 #define MID_MACHINE MID_ARM6 72 73 /* 74 * Round p (pointer or byte index) up to a correctly-aligned value 75 * for all data types (int, long, ...). The result is u_int and 76 * must be cast to any desired pointer type. 77 * 78 * ALIGNED_POINTER is a boolean macro that checks whether an address 79 * is valid to fetch data elements of type t from on this architecture. 80 * This does not reflect the optimal alignment, just the possibility 81 * (within reasonable limits). 82 * 83 */ 84 #define ALIGNBYTES (sizeof(int) - 1) 85 #define ALIGN(p) (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES) 86 #define ALIGNED_POINTER(p,t) ((((u_long)(p)) & (sizeof(t)-1)) == 0) 87 /* ARM-specific macro to align a stack pointer (downwards). */ 88 #define STACKALIGNBYTES (8 - 1) 89 #define STACKALIGN(p) ((u_int)(p) &~ STACKALIGNBYTES) 90 91 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 92 #define DEV_BSIZE (1 << DEV_BSHIFT) 93 #define BLKDEV_IOSIZE 2048 94 95 #ifndef MAXPHYS 96 #define MAXPHYS 65536 /* max I/O transfer size */ 97 #endif 98 99 /* pages ("clicks") to disk blocks */ 100 #define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT)) 101 #define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT)) 102 /*#define dtob(x) ((x) << DEV_BSHIFT)*/ 103 104 #define ctob(x) ((x) << PGSHIFT) 105 106 /* bytes to pages */ 107 #define btoc(x) (((x) + PGOFSET) >> PGSHIFT) 108 109 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 110 ((bytes) >> DEV_BSHIFT) 111 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 112 ((db) << DEV_BSHIFT) 113 114 /* 115 * Map a ``block device block'' to a file system block. 116 * This should be device dependent, and should use the bsize 117 * field from the disk label. 118 * For now though just use DEV_BSIZE. 119 */ 120 #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE / DEV_BSIZE)) 121 122 /* 123 * Constants related to network buffer management. 124 * MCLBYTES must be no larger than NBPG (the software page size), and, 125 * on machines that exchange pages of input or output buffers with mbuf 126 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple 127 * of the hardware page size. 128 */ 129 #define MSIZE 256 /* size of an mbuf */ 130 131 #ifndef MCLSHIFT 132 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 133 /* 2K cluster can hold Ether frame */ 134 #endif /* MCLSHIFT */ 135 136 #define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */ 137 138 #endif /* _ARM_PARAM_H_ */ 139