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param.h revision 1.38 
      1 /* $NetBSD: param.h,v 1.38 2011/02/08 20:20:07 rmind Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1988 University of Utah.
      5  * Copyright (c) 1992, 1993
      6  *	The Regents of the University of California.  All rights reserved.
      7  *
      8  * This code is derived from software contributed to Berkeley by
      9  * the Systems Programming Group of the University of Utah Computer
     10  * Science Department and Ralph Campbell.
     11  *
     12  * Redistribution and use in source and binary forms, with or without
     13  * modification, are permitted provided that the following conditions
     14  * are met:
     15  * 1. Redistributions of source code must retain the above copyright
     16  *    notice, this list of conditions and the following disclaimer.
     17  * 2. Redistributions in binary form must reproduce the above copyright
     18  *    notice, this list of conditions and the following disclaimer in the
     19  *    documentation and/or other materials provided with the distribution.
     20  * 3. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  *
     36  * from: Utah $Hdr: machparam.h 1.11 89/08/14$
     37  *
     38  *	@(#)param.h	8.1 (Berkeley) 6/10/93
     39  */
     40 
     41 /*
     42  * Machine dependent constants for the Alpha.
     43  */
     44 #define	_MACHINE	alpha
     45 #define	MACHINE		"alpha"
     46 #define	_MACHINE_ARCH	alpha
     47 #define	MACHINE_ARCH	"alpha"
     48 #define	MID_MACHINE	MID_ALPHA
     49 
     50 #include <machine/cpu.h>
     51 
     52 /*
     53  * Round p (pointer or byte index) up to a correctly-aligned value for all
     54  * data types (int, long, ...).   The result is u_long and must be cast to
     55  * any desired pointer type.
     56  *
     57  * ALIGNED_POINTER is a boolean macro that checks whether an address
     58  * is valid to fetch data elements of type t from on this architecture.
     59  * This does not reflect the optimal alignment, just the possibility
     60  * (within reasonable limits).
     61  *
     62  */
     63 #define	ALIGNBYTES		7
     64 #define	ALIGN(p)		(((u_long)(p) + ALIGNBYTES) &~ ALIGNBYTES)
     65 #define ALIGNED_POINTER(p,t)	((((u_long)(p)) & (sizeof(t)-1)) == 0)
     66 
     67 #define	NBPG		(1 << ALPHA_PGSHIFT)		/* bytes/page */
     68 #define	PGOFSET		(NBPG-1)			/* byte off. into pg */
     69 #define	PGSHIFT		ALPHA_PGSHIFT			/* LOG2(NBPG) */
     70 
     71 #define	KERNBASE	0xfffffc0000230000	/* start of kernel virtual */
     72 #define	BTOPKERNBASE	((u_long)KERNBASE >> PGSHIFT)
     73 
     74 #define	DEV_BSIZE	512
     75 #define	DEV_BSHIFT	9		/* log2(DEV_BSIZE) */
     76 #define	BLKDEV_IOSIZE	2048
     77 #ifndef	MAXPHYS
     78 #define	MAXPHYS		(64 * 1024)	/* max raw I/O transfer size */
     79 #endif
     80 
     81 #define	SSIZE		1		/* initial stack size/NBPG */
     82 #define	SINCR		1		/* increment of stack/NBPG */
     83 
     84 #define	UPAGES		2			/* pages of u-area */
     85 #define	USPACE		(UPAGES * NBPG)		/* total size of u-area */
     86 
     87 #ifndef MSGBUFSIZE
     88 #define MSGBUFSIZE	NBPG		/* default message buffer size */
     89 #endif
     90 
     91 /*
     92  * Constants related to network buffer management.
     93  * MCLBYTES must be no larger than NBPG (the software page size), and,
     94  * on machines that exchange pages of input or output buffers with mbuf
     95  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
     96  * of the hardware page size.
     97  */
     98 #define	MSIZE		256		/* size of an mbuf */
     99 
    100 #ifndef MCLSHIFT
    101 #define	MCLSHIFT	11		/* convert bytes to m_buf clusters */
    102 					/* 2K cluster can hold Ether frame */
    103 #endif	/* MCLSHIFT */
    104 
    105 #define	MCLBYTES	(1 << MCLSHIFT)	/* size of a m_buf cluster */
    106 
    107 /*
    108  * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
    109  * logical pages.
    110  */
    111 #define	NKMEMPAGES_MIN_DEFAULT	((8 * 1024 * 1024) >> PAGE_SHIFT)
    112 #define	NKMEMPAGES_MAX_DEFAULT	((128 * 1024 * 1024) >> PAGE_SHIFT)
    113 
    114 /*
    115  * Mach derived conversion macros
    116  */
    117 #define	alpha_round_page(x)	((((unsigned long)(x)) + NBPG - 1) & ~(NBPG-1))
    118 #define	alpha_trunc_page(x)	((unsigned long)(x) & ~(NBPG-1))
    119 #define	alpha_btop(x)		((unsigned long)(x) >> PGSHIFT)
    120 #define	alpha_ptob(x)		((unsigned long)(x) << PGSHIFT)
    121 
    122 #ifdef _KERNEL
    123 #ifndef _LOCORE
    124 
    125 #include <machine/intr.h>
    126 
    127 void	delay(unsigned long);
    128 #define	DELAY(n)	delay(n)
    129 
    130 /* XXX THE FOLLOWING PROTOTYPE SHOULD BE A BUS.H INTERFACE */
    131 paddr_t alpha_XXX_dmamap(vaddr_t);
    132 /* XXX END BUS.H */
    133 
    134 #endif
    135 #endif /* !_KERNEL */
    136