169 lines
6.1 KiB
C
169 lines
6.1 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)param.h 5.8 (Berkeley) 6/28/91
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* $Id: param.h,v 1.17 1995/01/23 19:21:49 davidg Exp $
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*/
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#ifndef _MACHINE_PARAM_H_
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#define _MACHINE_PARAM_H_
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/*
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* Machine dependent constants for Intel 386.
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*/
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#define MACHINE "i386"
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#define MID_MACHINE MID_I386
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/*
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* Round p (pointer or byte index) up to a correctly-aligned value
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* for all data types (int, long, ...). The result is unsigned int
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* and must be cast to any desired pointer type.
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*/
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#define ALIGNBYTES (sizeof(int) - 1)
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#define ALIGN(p) (((unsigned)(p) + ALIGNBYTES) & ~ALIGNBYTES)
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/* XXX PGSHIFT and PG_SHIFT are two names for the same thing */
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#define PGSHIFT 12 /* LOG2(NBPG) */
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#define PAGE_SHIFT 12
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#define NBPG (1 << PAGE_SHIFT) /* bytes/page */
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#define PAGE_SIZE (1 << PAGE_SHIFT)
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#define PAGE_MASK (PAGE_SIZE-1)
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#define PGOFSET (NBPG-1) /* byte offset into page */
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#define NPTEPG (NBPG/(sizeof (pt_entry_t)))
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/* XXX PDRSHIFT and PD_SHIFT are two names for the same thing */
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#define PDRSHIFT 22 /* LOG2(NBPDR) */
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#define NBPDR (1 << PDRSHIFT) /* bytes/page dir */
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#define PDROFSET (NBPDR-1) /* byte offset into page dir */
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/*
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* XXX This should really be KPTDPTDI << PDRSHIFT, but since KPTDPTDI is
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* defined in pmap.h which is included after this we can't do that
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* (YET!)
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*/
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#define BTOPKERNBASE (KERNBASE >> PGSHIFT)
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#define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
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#define DEV_BSIZE (1 << DEV_BSHIFT)
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#define BLKDEV_IOSIZE 2048
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#define MAXPHYS (64 * 1024) /* max raw I/O transfer size */
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#define CLSIZELOG2 0
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#define CLSIZE (1 << CLSIZELOG2)
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/* NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE */
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#define SSIZE 1 /* initial stack size/NBPG */
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#define SINCR 1 /* increment of stack/NBPG */
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#define UPAGES 2 /* pages of u-area */
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/*
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* Constants related to network buffer management.
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* MCLBYTES must be no larger than CLBYTES (the software page size), and,
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* on machines that exchange pages of input or output buffers with mbuf
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* clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
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* of the hardware page size.
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*/
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#ifndef MSIZE
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#define MSIZE 128 /* size of an mbuf */
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#endif /* MSIZE */
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#ifndef MCLSHIFT
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#define MCLSHIFT 11 /* convert bytes to m_buf clusters */
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#endif /* MCLSHIFT */
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#define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */
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#define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */
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#ifndef NMBCLUSTERS
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#ifdef GATEWAY
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#define NMBCLUSTERS 512 /* map size, max cluster allocation */
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#else
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#define NMBCLUSTERS 256 /* map size, max cluster allocation */
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#endif /* GATEWAY */
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#endif /* NMBCLUSTERS */
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/*
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* Some macros for units conversion
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*/
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/* Core clicks (4096 bytes) to segments and vice versa */
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#define ctos(x) (x)
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#define stoc(x) (x)
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/* Core clicks (4096 bytes) to disk blocks */
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#define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT))
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#define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT))
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#define dtob(x) ((x)<<DEV_BSHIFT)
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/* clicks to bytes */
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#define ctob(x) ((x)<<PGSHIFT)
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/* bytes to clicks */
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#define btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT)
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/*
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* This is messy and perhaps slow because `bytes' may be an off_t. We
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* have to shift an unsigned type to avoid sign extension and we don't
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* want to widen `bytes' unnecessarily. Assume that off_t is long long
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* and daddr_t is unsigned long.
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*/
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#define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
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(sizeof (bytes) > sizeof(long) \
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? (unsigned long)((unsigned long long)(bytes) >> DEV_BSHIFT) \
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: (unsigned long)((unsigned long)(bytes) >> DEV_BSHIFT))
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#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
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((unsigned long long)(db) << DEV_BSHIFT)
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/*
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* Mach derived conversion macros
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*/
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#define trunc_page(x) ((unsigned)(x) & ~(NBPG-1))
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#define round_page(x) ((((unsigned)(x)) + NBPG - 1) & ~(NBPG-1))
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#define atop(x) ((unsigned)(x) >> PG_SHIFT)
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#define ptoa(x) ((unsigned)(x) << PG_SHIFT)
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#define i386_round_pdr(x) ((((unsigned)(x)) + NBPDR - 1) & ~(NBPDR-1))
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#define i386_trunc_pdr(x) ((unsigned)(x) & ~(NBPDR-1))
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#define i386_round_page(x) ((((unsigned)(x)) + NBPG - 1) & ~(NBPG-1))
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#define i386_trunc_page(x) ((unsigned)(x) & ~(NBPG-1))
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#define i386_btod(x) ((unsigned)(x) >> PDRSHIFT)
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#define i386_dtob(x) ((unsigned)(x) << PDRSHIFT)
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#define i386_btop(x) ((unsigned)(x) >> PGSHIFT)
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#define i386_ptob(x) ((unsigned)(x) << PGSHIFT)
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#endif /* !_MACHINE_PARAM_H_ */
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