/* $NetBSD: param.h,v 1.91 2026/05/10 16:07:56 thorpej Exp $ */ /*- * 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. 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. * * @(#)param.h 5.8 (Berkeley) 6/28/91 */ #ifndef _I386_PARAM_H_ #define _I386_PARAM_H_ #ifdef _KERNEL_OPT #include "opt_param.h" #endif /* * Machine dependent constants for Intel 386. */ /* * MAXCPUS must be defined before cpu.h inclusion. Note: i386 might * support more CPUs, but due to the limited KVA space available on * i386, such support would be inefficient. Use amd64 instead. */ #define MAXCPUS 32 #ifdef _KERNEL #include <machine/cpu.h> #endif #define _MACHINE i386 #define MACHINE "i386" #define _MACHINE_ARCH i386 #define MACHINE_ARCH "i386" #define MID_MACHINE MID_I386 #define ALIGNED_POINTER(p,t) 1 #define ALIGNED_POINTER_LOAD(q,p,t) memcpy((q), (p), sizeof(t)) /* * Stack alignment is 4-byte, following the traditional i386 SysV ABI * published by SCO. Note: Parts of the Linux world have altered the * ABI to guarantee 16-byte alignment, which is convenient for SSE2, * but an incompatible ABI change which we do not follow. */ #define STACK_ALIGNBYTES (4 - 1) #define PGSHIFT 12 /* LOG2(NBPG) */ #define NBPG (1 << PGSHIFT) /* bytes/page */ #define PGOFSET (NBPG-1) /* byte offset into page */ #define NPTEPG (NBPG/(sizeof (pt_entry_t))) #define MAXIOMEM 0xffffffff /* * Maximum physical memory supported by the implementation. */ #ifdef PAE #define MAXPHYSMEM 0x1000000000ULL /* 64GB */ #else #define MAXPHYSMEM 0x100000000ULL /* 4GB */ #endif #if defined(_KERNEL_OPT) #include "opt_kernbase.h" #endif /* defined(_KERNEL_OPT) */ #ifndef KERNBASE #define KERNBASE 0xc0000000UL /* start of kernel virtual space */ #endif #define KERNTEXTOFF (KERNBASE + 0x100000) /* start of kernel text */ #ifndef UPAGES # ifdef DIAGNOSTIC # define UPAGES 3 /* 2 + 1 page for redzone */ # else # define UPAGES 2 /* normal pages of u-area */ # endif /* DIAGNOSTIC */ #endif /* !defined(UPAGES) */ #define USPACE (UPAGES * NBPG) /* total size of u-area */ #define INTRSTACKSIZE 8192 #ifndef MSGBUFSIZE #define MSGBUFSIZE (16*NBPG) /* default message buffer size */ #endif /* * Constants related to network buffer management. * MCLBYTES must be no larger than NBPG (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. */ #define MSIZE 256 /* size of an mbuf */ #ifndef MCLSHIFT #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ /* 2K cluster can hold Ether frame */ #endif /* MCLSHIFT */ #define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */ #ifndef NMBCLUSTERS_MAX #define NMBCLUSTERS_MAX (0x4000000 / MCLBYTES) /* Limit to 64MB for clusters */ #endif #ifndef NFS_RSIZE #define NFS_RSIZE 32768 #endif #ifndef NFS_WSIZE #define NFS_WSIZE 32768 #endif /* * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized * logical pages. */ #define NKMEMPAGES_MIN_DEFAULT ((16 * 1024 * 1024) >> PAGE_SHIFT) #define NKMEMPAGES_MAX_DEFAULT ((360 * 1024 * 1024) >> PAGE_SHIFT) /* * Mach derived conversion macros */ #define x86_round_pdr(x) \ ((((unsigned long)(x)) + (NBPD_L2 - 1)) & ~(NBPD_L2 - 1)) #define x86_trunc_pdr(x) ((unsigned long)(x) & ~(NBPD_L2 - 1)) #define x86_btod(x) ((unsigned long)(x) >> L2_SHIFT) #define x86_dtob(x) ((unsigned long)(x) << L2_SHIFT) #define x86_round_page(x) ((((paddr_t)(x)) + PGOFSET) & ~PGOFSET) #define x86_trunc_page(x) ((paddr_t)(x) & ~PGOFSET) #define x86_btop(x) ((paddr_t)(x) >> PGSHIFT) #define x86_ptob(x) ((paddr_t)(x) << PGSHIFT) #endif /* _I386_PARAM_H_ */
