d738f90fd7
- for sizeof(void *) == 8 arch, this is mandatory. MHLEN is too small already (less than 80) and there are chances for unwanted packet loss due to m_pullup restriction. - for other cases, the change should avoid allocating clusters in most cases (even when you have IPv4 IPsec tunnel, or IPv6 with moderate amount of extension header) portmasters: if your arch chokes with the change (high memory usage or whatever), please backout the change for your arch.
138 lines
4.3 KiB
C
138 lines
4.3 KiB
C
/* $NetBSD: param.h,v 1.10 2000/06/30 17:55:15 itojun Exp $ */
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/*-
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* Copyright (C) 1995, 1996 Wolfgang Solfrank.
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* Copyright (C) 1995, 1996 TooLs GmbH.
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* All rights reserved.
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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 TooLs GmbH.
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* 4. The name of TooLs GmbH may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef _KERNEL
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#ifndef _LOCORE
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#include <machine/cpu.h>
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#endif /* _LOCORE */
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#endif
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/*
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* Machine dependent constants for PowerPC (32-bit only currently)
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*/
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#define MACHINE "macppc"
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#define MACHINE_ARCH "powerpc"
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#define MID_MACHINE MID_POWERPC
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#define ALIGNBYTES (sizeof(double) - 1)
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#define ALIGN(p) (((u_int)(p) + ALIGNBYTES) & ~ALIGNBYTES)
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#define ALIGNED_POINTER(p,t) ((((u_long)(p)) & (sizeof(t)-1)) == 0)
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#define PGSHIFT 12
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#define NBPG (1 << PGSHIFT) /* Page size */
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#define PGOFSET (NBPG - 1)
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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 NBPG
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#define MAXPHYS (64 * 1024) /* max raw I/O transfer size */
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#define UPAGES 4
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#define USPACE (UPAGES * NBPG)
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#ifndef MSGBUFSIZE
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#define MSGBUFSIZE NBPG /* default message buffer size */
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#endif
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#define KERNBASE 0x100000
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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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#define MCLSHIFT 11 /* convert bytes to m_buf clusters */
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#define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */
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#ifndef NMBCLUSTERS
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#if defined(_KERNEL) && !defined(_LKM)
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#include "opt_gateway.h"
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#endif /* _KERNEL && ! _LKM */
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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
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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 ((48 * 1024 * 1024) >> PAGE_SHIFT)
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/*
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* pages ("clicks") to disk blocks
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*/
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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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/*
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* bytes to pages
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*/
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#define ctob(x) ((x) << PGSHIFT)
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#define btoc(x) (((x) + PGOFSET) >> PGSHIFT)
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/*
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* bytes to disk blocks
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*/
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#define dbtob(x) ((x) << DEV_BSHIFT)
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#define btodb(x) ((x) >> DEV_BSHIFT)
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/*
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* Segment handling stuff
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*/
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#define SEGMENT_LENGTH 0x10000000
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#define SEGMENT_MASK 0xf0000000
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/*
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* Fixed segments
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*/
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#define USER_SR 13
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#define KERNEL_SR 14
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#define KERNEL_SEGMENT (0xf00000 + KERNEL_SR)
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#define EMPTY_SEGMENT 0xfffff0
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#define USER_ADDR ((void *)(USER_SR << ADDR_SR_SHFT))
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/*
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* Some system constants
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*/
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#ifndef NPMAPS
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#define NPMAPS 32768 /* Number of pmaps in system */
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#endif
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