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Diffstat (limited to 'sys/i386/include/param.h')
| -rw-r--r-- | sys/i386/include/param.h | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/sys/i386/include/param.h b/sys/i386/include/param.h new file mode 100644 index 0000000..ab8ad9c --- /dev/null +++ b/sys/i386/include/param.h @@ -0,0 +1,168 @@ +/*- + * 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. 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. + * + * from: @(#)param.h 5.8 (Berkeley) 6/28/91 + * $Id: param.h,v 1.13 1994/01/31 04:18:54 davidg Exp $ + */ + +#ifndef _MACHINE_PARAM_H_ +#define _MACHINE_PARAM_H_ 1 + +/* + * Machine dependent constants for Intel 386. + */ + +#define MACHINE "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. + */ +#define ALIGNBYTES (sizeof(int) - 1) +#define ALIGN(p) (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES) + +/* XXX PGSHIFT and PG_SHIFT are two names for the same thing */ +#define PGSHIFT 12 /* LOG2(NBPG) */ +#define PAGE_SHIFT 12 +#define NBPG (1 << PAGE_SHIFT) /* bytes/page */ +#define PAGE_SIZE (1 << PAGE_SHIFT) +#define PAGE_MASK (PAGE_SIZE-1) +#define PGOFSET (NBPG-1) /* byte offset into page */ +#define NPTEPG (NBPG/(sizeof (pt_entry_t))) + +/* XXX PDRSHIFT and PD_SHIFT are two names for the same thing */ +#define PDRSHIFT 22 /* LOG2(NBPDR) */ +#define NBPDR (1 << PDRSHIFT) /* bytes/page dir */ +#define PDROFSET (NBPDR-1) /* byte offset into page dir */ + +/* + * XXX This should really be KPTDPTDI << PDRSHIFT, but since KPTDPTDI is + * defined in pmap.h which is included after this we can't do that + * (YET!) + */ +#define BTOPKERNBASE (KERNBASE >> PGSHIFT) + +#define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ +#define DEV_BSIZE (1 << DEV_BSHIFT) + +#define BLKDEV_IOSIZE 2048 +#define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ + +#define CLSIZELOG2 0 +#define CLSIZE (1 << CLSIZELOG2) + +/* NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE */ +#define SSIZE 1 /* initial stack size/NBPG */ +#define SINCR 1 /* increment of stack/NBPG */ + +#define UPAGES 2 /* pages of u-area */ + +/* + * Constants related to network buffer management. + * MCLBYTES must be no larger than CLBYTES (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. + */ +#ifndef MSIZE +#define MSIZE 128 /* size of an mbuf */ +#endif /* MSIZE */ + +#ifndef MCLSHIFT +#define MCLSHIFT 12 /* convert bytes to m_buf clusters */ +#endif /* MCLSHIFT */ +#define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */ +#define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */ + +#ifndef NMBCLUSTERS +#ifdef GATEWAY +#define NMBCLUSTERS 512 /* map size, max cluster allocation */ +#else +#define NMBCLUSTERS 256 /* map size, max cluster allocation */ +#endif /* GATEWAY */ +#endif /* NMBCLUSTERS */ + +/* + * Some macros for units conversion + */ +/* Core clicks (4096 bytes) to segments and vice versa */ +#define ctos(x) (x) +#define stoc(x) (x) + +/* Core clicks (4096 bytes) to disk blocks */ +#define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT)) +#define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT)) +#define dtob(x) ((x)<<DEV_BSHIFT) + +/* clicks to bytes */ +#define ctob(x) ((x)<<PGSHIFT) + +/* bytes to clicks */ +#define btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT) + +#define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ + ((unsigned)(bytes) >> DEV_BSHIFT) +#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ + ((unsigned)(db) << DEV_BSHIFT) + +/* + * Map a ``block device block'' to a file system block. + * This should be device dependent, and will be if we + * add an entry to cdevsw/bdevsw for that purpose. + * For now though just use DEV_BSIZE. + */ +#define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE)) + +/* + * Mach derived conversion macros + */ +#define trunc_page(x) ((unsigned)(x) & ~(NBPG-1)) +#define round_page(x) ((((unsigned)(x)) + NBPG - 1) & ~(NBPG-1)) + +#define atop(x) ((unsigned)(x) >> PG_SHIFT) +#define ptoa(x) ((unsigned)(x) << PG_SHIFT) + +#define i386_round_pdr(x) ((((unsigned)(x)) + NBPDR - 1) & ~(NBPDR-1)) +#define i386_trunc_pdr(x) ((unsigned)(x) & ~(NBPDR-1)) +#define i386_round_page(x) ((((unsigned)(x)) + NBPG - 1) & ~(NBPG-1)) +#define i386_trunc_page(x) ((unsigned)(x) & ~(NBPG-1)) +#define i386_btod(x) ((unsigned)(x) >> PDRSHIFT) +#define i386_dtob(x) ((unsigned)(x) << PDRSHIFT) +#define i386_btop(x) ((unsigned)(x) >> PGSHIFT) +#define i386_ptob(x) ((unsigned)(x) << PGSHIFT) + +#endif /* _MACHINE_PARAM_H_ */ |
