Annotation of sys/arch/i386/include/param.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: param.h,v 1.40 2007/05/28 21:02:49 thib Exp $ */
! 2: /* $NetBSD: param.h,v 1.29 1996/03/04 05:04:26 cgd Exp $ */
! 3:
! 4: /*-
! 5: * Copyright (c) 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: * William Jolitz.
! 10: *
! 11: * Redistribution and use in source and binary forms, with or without
! 12: * modification, are permitted provided that the following conditions
! 13: * are met:
! 14: * 1. Redistributions of source code must retain the above copyright
! 15: * notice, this list of conditions and the following disclaimer.
! 16: * 2. Redistributions in binary form must reproduce the above copyright
! 17: * notice, this list of conditions and the following disclaimer in the
! 18: * documentation and/or other materials provided with the distribution.
! 19: * 3. Neither the name of the University nor the names of its contributors
! 20: * may be used to endorse or promote products derived from this software
! 21: * without specific prior written permission.
! 22: *
! 23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 33: * SUCH DAMAGE.
! 34: *
! 35: * @(#)param.h 5.8 (Berkeley) 6/28/91
! 36: */
! 37:
! 38: /*
! 39: * Machine dependent constants for Intel 386.
! 40: */
! 41:
! 42: #ifdef _KERNEL
! 43: #ifdef _LOCORE
! 44: #include <machine/psl.h>
! 45: #else
! 46: #include <machine/cpu.h>
! 47: #endif
! 48: #endif
! 49:
! 50: #define _MACHINE i386
! 51: #define MACHINE "i386"
! 52: #define _MACHINE_ARCH i386
! 53: #define MACHINE_ARCH "i386"
! 54: #define MID_MACHINE MID_I386
! 55:
! 56: /*
! 57: * Round p (pointer or byte index) up to a correctly-aligned value
! 58: * for all data types (int, long, ...). The result is u_int and
! 59: * must be cast to any desired pointer type.
! 60: *
! 61: * ALIGNED_POINTER is a boolean macro that checks whether an address
! 62: * is valid to fetch data elements of type t from on this architecture.
! 63: * This does not reflect the optimal alignment, just the possibility
! 64: * (within reasonable limits).
! 65: */
! 66: #define ALIGNBYTES (sizeof(int) - 1)
! 67: #define ALIGN(p) (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES)
! 68: #define ALIGNED_POINTER(p,t) 1
! 69:
! 70: #define PGSHIFT 12 /* LOG2(NBPG) */
! 71: #define NBPG (1 << PGSHIFT) /* bytes/page */
! 72: #define PGOFSET (NBPG-1) /* byte offset into page */
! 73:
! 74: #define PAGE_SHIFT 12
! 75: #define PAGE_SIZE (1 << PAGE_SHIFT)
! 76: #define PAGE_MASK (PAGE_SIZE - 1)
! 77:
! 78: #define NPTEPG (NBPG/(sizeof (pt_entry_t)))
! 79:
! 80: /*
! 81: * Start of kernel virtual space. Remember to alter the memory and
! 82: * page table layout description in pmap.h when changing this.
! 83: */
! 84: #define KERNBASE 0xd0000000
! 85:
! 86: #define KERNTEXTOFF (KERNBASE+0x200000) /* start of kernel text */
! 87:
! 88: #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
! 89: #define DEV_BSIZE (1 << DEV_BSHIFT)
! 90: #define BLKDEV_IOSIZE 2048
! 91: #ifndef MAXPHYS
! 92: #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */
! 93: #endif
! 94:
! 95: #define UPAGES 2 /* pages of u-area */
! 96: #define USPACE (UPAGES * NBPG) /* total size of u-area */
! 97: #define USPACE_ALIGN (0) /* u-area alignment 0-none */
! 98:
! 99: #ifndef MSGBUFSIZE
! 100: #define MSGBUFSIZE 4*NBPG /* default message buffer size */
! 101: #endif
! 102:
! 103: /*
! 104: * Constants related to network buffer management.
! 105: */
! 106: #define NMBCLUSTERS 6144 /* map size, max cluster allocation */
! 107:
! 108: /*
! 109: * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
! 110: * logical pages.
! 111: */
! 112: #define NKMEMPAGES_MIN_DEFAULT ((8 * 1024 * 1024) >> PAGE_SHIFT)
! 113: #define NKMEMPAGES_MAX_DEFAULT ((64 * 1024 * 1024) >> PAGE_SHIFT)
! 114:
! 115: /* pages ("clicks") to disk blocks */
! 116: #define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT))
! 117: #define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT))
! 118:
! 119: /* bytes to pages */
! 120: #define ctob(x) ((x) << PGSHIFT)
! 121: #define btoc(x) (((x) + PGOFSET) >> PGSHIFT)
! 122:
! 123: /* bytes to disk blocks */
! 124: #define dbtob(x) ((x) << DEV_BSHIFT)
! 125: #define btodb(x) ((x) >> DEV_BSHIFT)
! 126:
! 127: /*
! 128: * Mach derived conversion macros
! 129: */
! 130: #define i386_round_pdr(x) ((((unsigned)(x)) + PDOFSET) & ~PDOFSET)
! 131: #define i386_trunc_pdr(x) ((unsigned)(x) & ~PDOFSET)
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