/* $OpenBSD: param.h,v 1.24 2003/06/02 23:27:47 millert Exp $ */ /* $NetBSD: param.h,v 1.29 1996/03/04 05:04:26 cgd Exp $ */ /*- * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * William Jolitz. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)param.h 5.8 (Berkeley) 6/28/91 */ /* * Machine dependent constants for Intel 386. */ #ifdef _KERNEL #ifdef _LOCORE #include #else #include #endif #endif #define _MACHINE i386 #define MACHINE "i386" #define _MACHINE_ARCH i386 #define MACHINE_ARCH "i386" #define MID_MACHINE MID_I386 /* * Round p (pointer or byte index) up to a correctly-aligned value * for all data types (int, long, ...). The result is u_int and * must be cast to any desired pointer type. * * ALIGNED_POINTER is a boolean macro that checks whether an address * is valid to fetch data elements of type t from on this architecture. * This does not reflect the optimal alignment, just the possibility * (within reasonable limits). */ #define ALIGNBYTES (sizeof(int) - 1) #define ALIGN(p) (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES) #define ALIGNED_POINTER(p,t) 1 #define PGSHIFT 12 /* LOG2(NBPG) */ #define NBPG (1 << PGSHIFT) /* bytes/page */ #define PGOFSET (NBPG-1) /* byte offset into page */ #define PAGE_SHIFT 12 #define PAGE_SIZE (1 << PAGE_SHIFT) #define PAGE_MASK (PAGE_SIZE - 1) #define NPTEPG (NBPG/(sizeof (pt_entry_t))) /* * Start of kernel virtual space. Remember to alter the memory and * page table layout description in pmap.h when changing this. */ #define KERNBASE 0xd0000000 #define KERNTEXTOFF (KERNBASE+0x100000) /* start of kernel text */ #define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT) #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ #define DEV_BSIZE (1 << DEV_BSHIFT) #define BLKDEV_IOSIZE 2048 #ifndef MAXPHYS #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ #endif #define SSIZE 1 /* initial stack size/NBPG */ #define SINCR 1 /* increment of stack/NBPG */ #define UPAGES 2 /* pages of u-area */ #define USPACE (UPAGES * NBPG) /* total size of u-area */ #ifndef MSGBUFSIZE #define MSGBUFSIZE 2*NBPG /* default message buffer size */ #endif /* * Constants related to network buffer management. * MCLBYTES must be no larger than the software page size, and, * on machines that exchange pages of input or output buffers with mbuf * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple * of the hardware page size. */ #define MSIZE 256 /* size of an mbuf */ #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ #define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */ #define MCLOFSET (MCLBYTES - 1) /* offset within a m_buf cluster */ #ifndef NMBCLUSTERS #define NMBCLUSTERS 2048 /* map size, max cluster allocation */ #endif /* * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized * logical pages. */ #define NKMEMPAGES_MIN_DEFAULT ((8 * 1024 * 1024) >> PAGE_SHIFT) #define NKMEMPAGES_MAX_DEFAULT ((64 * 1024 * 1024) >> PAGE_SHIFT) /* pages ("clicks") to disk blocks */ #define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT)) #define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT)) /* bytes to pages */ #define ctob(x) ((x) << PGSHIFT) #define btoc(x) (((x) + PGOFSET) >> PGSHIFT) /* bytes to disk blocks */ #define dbtob(x) ((x) << DEV_BSHIFT) #define btodb(x) ((x) >> DEV_BSHIFT) /* * Map a ``block device block'' to a file system block. * This should be device dependent, and should use the bsize * field from the disk label. * For now though just use DEV_BSIZE. */ #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE / DEV_BSIZE)) /* * Mach derived conversion macros */ #define i386_round_pdr(x) ((((unsigned)(x)) + PDOFSET) & ~PDOFSET) #define i386_trunc_pdr(x) ((unsigned)(x) & ~PDOFSET) #define i386_btod(x) ((unsigned)(x) >> PDSHIFT) #define i386_dtob(x) ((unsigned)(x) << PDSHIFT) #define i386_round_page(x) ((((unsigned)(x)) + PGOFSET) & ~PGOFSET) #define i386_trunc_page(x) ((unsigned)(x) & ~PGOFSET) #define i386_btop(x) ((unsigned)(x) >> PGSHIFT) #define i386_ptob(x) ((unsigned)(x) << PGSHIFT)