d621e29eca
on the amount of physical memory and limited by NMBCLUSTERS if present. Architectures without direct mapping also limit it based on the kmem_map size, which is used as backing store. On i386 and ARM, the maximum KVA used for mbuf clusters is limited to 64MB by default. The old default limits and limits based on GATEWAY have been removed. key_registered_sb_max is hard-wired to a value derived from 2048 clusters.
162 lines
5.3 KiB
C
162 lines
5.3 KiB
C
/* $NetBSD: param.h,v 1.72 2010/02/08 19:02:29 joerg Exp $ */
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/*-
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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. 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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* @(#)param.h 5.8 (Berkeley) 6/28/91
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*/
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#ifndef _I386_PARAM_H_
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#define _I386_PARAM_H_
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/*
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* Machine dependent constants for Intel 386.
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*/
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#ifdef _KERNEL
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#include <machine/cpu.h>
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#endif
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#define _MACHINE i386
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#define MACHINE "i386"
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#define _MACHINE_ARCH i386
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#define MACHINE_ARCH "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 u_int and
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* must be cast to any desired pointer type.
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*
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* ALIGNED_POINTER is a boolean macro that checks whether an address
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* is valid to fetch data elements of type t from on this architecture.
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* This does not reflect the optimal alignment, just the possibility
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* (within reasonable limits).
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*
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*/
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#define ALIGNBYTES (sizeof(int) - 1)
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#define ALIGN(p) (((u_int)(u_long)(p) + ALIGNBYTES) &~ \
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ALIGNBYTES)
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#define ALIGNED_POINTER(p,t) 1
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#define PGSHIFT 12 /* LOG2(NBPG) */
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#define NBPG (1 << PGSHIFT) /* bytes/page */
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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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#if defined(_KERNEL_OPT)
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#include "opt_kernbase.h"
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#endif /* defined(_KERNEL_OPT) */
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#ifdef KERNBASE_LOCORE
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#error "You should only re-define KERNBASE"
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#endif
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#ifndef KERNBASE
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#define KERNBASE 0xc0000000UL /* start of kernel virtual space */
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#endif
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#define KERNTEXTOFF (KERNBASE + 0x100000) /* start of kernel text */
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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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#ifndef MAXPHYS
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#define MAXPHYS (64 * 1024) /* max raw I/O transfer size */
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#endif
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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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#ifndef UPAGES
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# ifdef DIAGNOSTIC
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# define UPAGES 3 /* 2 + 1 page for redzone */
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# else
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# define UPAGES 2 /* normal pages of u-area */
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# endif /* DIAGNOSTIC */
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#endif /* !defined(UPAGES) */
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#define USPACE (UPAGES * NBPG) /* total size of u-area */
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#define INTRSTACKSIZE 8192
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#ifndef MSGBUFSIZE
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#define MSGBUFSIZE 8*NBPG /* default message buffer size */
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#endif
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/*
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* Constants related to network buffer management.
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* MCLBYTES must be no larger than NBPG (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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#define MSIZE 256 /* size of an mbuf */
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#ifndef MCLSHIFT
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#define MCLSHIFT 11 /* convert bytes to m_buf clusters */
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/* 2K cluster can hold Ether frame */
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#endif /* MCLSHIFT */
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#define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */
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#ifndef NMBCLUSTERS_MAX
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#define NMBCLUSTERS_MAX (0x2000000 / MCLBYTES) /* Limit to 64MB for clusters */
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#endif
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#ifndef NFS_RSIZE
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#define NFS_RSIZE 32768
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#endif
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#ifndef NFS_WSIZE
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#define NFS_WSIZE 32768
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#endif
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/*
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* Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
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* logical pages.
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*/
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#define NKMEMPAGES_MIN_DEFAULT ((8 * 1024 * 1024) >> PAGE_SHIFT)
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#define NKMEMPAGES_MAX_DEFAULT ((128 * 1024 * 1024) >> PAGE_SHIFT)
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/*
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* Mach derived conversion macros
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*/
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#define x86_round_pdr(x) \
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((((unsigned long)(x)) + (NBPD_L2 - 1)) & ~(NBPD_L2 - 1))
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#define x86_trunc_pdr(x) ((unsigned long)(x) & ~(NBPD_L2 - 1))
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#define x86_btod(x) ((unsigned long)(x) >> L2_SHIFT)
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#define x86_dtob(x) ((unsigned long)(x) << L2_SHIFT)
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#define x86_round_page(x) ((((paddr_t)(x)) + PGOFSET) & ~PGOFSET)
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#define x86_trunc_page(x) ((paddr_t)(x) & ~PGOFSET)
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#define x86_btop(x) ((paddr_t)(x) >> PGSHIFT)
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#define x86_ptob(x) ((paddr_t)(x) << PGSHIFT)
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#endif /* _I386_PARAM_H_ */
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