/* $NetBSD: vmparam.h,v 1.88 2022/08/21 13:15:15 riastradh 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. * * @(#)vmparam.h 5.9 (Berkeley) 5/12/91 */ #ifndef _I386_VMPARAM_H_ #define _I386_VMPARAM_H_ #include #include /* * Machine dependent constants for 386. */ /* * Page size on the IA-32 is not variable in the traditional sense. * We override the PAGE_* definitions to compile-time constants. */ #define PAGE_SHIFT 12 #define PAGE_SIZE (1 << PAGE_SHIFT) #define PAGE_MASK (PAGE_SIZE - 1) /* * Virtual address space arrangement. On 386, both user and kernel * share the address space, not unlike the vax. * USRSTACK is the top (end) of the user stack. Immediately above the * user stack is the page table map, and then kernel address space. */ #define USRSTACK VM_MAXUSER_ADDRESS /* * Virtual memory related constants, all in bytes */ #define MAXTSIZ (256*1024*1024) /* max text size */ #ifndef DFLDSIZ #define DFLDSIZ (256*1024*1024) /* initial data size limit */ #endif #ifndef MAXDSIZ #define MAXDSIZ (3U*1024*1024*1024) /* 3G max data size */ #endif #ifndef MAXDSIZ_BU #define MAXDSIZ_BU (2U*1024*1024*1024 + /* 2.5G max data size for */ \ 1U* 512*1024*1024) /* bottom-up allocation */ \ /* could be a bit more */ #endif #ifndef DFLSSIZ #define DFLSSIZ (2*1024*1024) /* initial stack size limit */ #endif #ifndef MAXSSIZ #define MAXSSIZ (64*1024*1024) /* max stack size */ #endif /* * IA-32 can't do per-page execute permission, so instead we implement * two executable segments for %cs, one that covers everything and one * that excludes some of the address space (currently just the stack). * I386_MAX_EXE_ADDR is the upper boundary for the smaller segment. */ #define I386_MAX_EXE_ADDR (USRSTACK - MAXSSIZ) /* * Size of User Raw I/O map */ #define USRIOSIZE 300 /* * See pmap_private.h for details. */ #ifdef PAE #define L2_SLOT_PTE (KERNBASE/NBPD_L2-4) /* 1532: for recursive PDP map */ #define L2_SLOT_KERN (KERNBASE/NBPD_L2) /* 1536: start of kernel space */ #else /* PAE */ #define L2_SLOT_PTE (KERNBASE/NBPD_L2-1) /* 767: for recursive PDP map */ #define L2_SLOT_KERN (KERNBASE/NBPD_L2) /* 768: start of kernel space */ #endif /* PAE */ #define L2_SLOT_KERNBASE L2_SLOT_KERN #define PDIR_SLOT_KERN L2_SLOT_KERN #define PDIR_SLOT_PTE L2_SLOT_PTE /* size of a PDP: usually one page, except for PAE */ #ifdef PAE #define PDP_SIZE 4 #else #define PDP_SIZE 1 #endif /* largest value (-1 for APTP space) */ #define NKL2_MAX_ENTRIES (NTOPLEVEL_PDES - (KERNBASE/NBPD_L2) - 1) #define NKL1_MAX_ENTRIES (unsigned long)(NKL2_MAX_ENTRIES * NPDPG) #define NKL2_KIMG_ENTRIES 0 /* XXX unused */ #define NKL2_START_ENTRIES 0 /* XXX computed on runtime */ #define NKL1_START_ENTRIES 0 /* XXX unused */ #ifndef XENPV #define NTOPLEVEL_PDES (PAGE_SIZE * PDP_SIZE / (sizeof (pd_entry_t))) #else /* !XENPV */ #ifdef PAE #define NTOPLEVEL_PDES 1964 /* 1964-2047 reserved by Xen */ #else /* PAE */ #define NTOPLEVEL_PDES 1008 /* 1008-1023 reserved by Xen */ #endif /* PAE */ #endif /* !XENPV */ /* * Mach derived constants */ /* user/kernel map constants */ #define VM_MIN_ADDRESS ((vaddr_t)0) #define VM_MAXUSER_ADDRESS ((vaddr_t)(PDIR_SLOT_PTE << L2_SHIFT) - PAGE_SIZE) #define VM_MAX_ADDRESS \ ((vaddr_t)((PDIR_SLOT_PTE << L2_SHIFT) + (PDIR_SLOT_PTE << L1_SHIFT))) #define VM_MIN_KERNEL_ADDRESS ((vaddr_t)(PDIR_SLOT_KERN << L2_SHIFT)) #define VM_MAX_KERNEL_ADDRESS ((vaddr_t)((PDIR_SLOT_KERN + NKL2_MAX_ENTRIES) << L2_SHIFT)) /* * The address to which unspecified mapping requests default */ #ifdef _KERNEL_OPT #include "opt_uvm.h" #include "opt_xen.h" #endif #define __USE_TOPDOWN_VM #define VM_DEFAULT_ADDRESS_BOTTOMUP(da, sz) \ round_page((vaddr_t)(da) + (vsize_t)MIN(maxdmap, MAXDSIZ_BU)) /* virtual sizes (bytes) for various kernel submaps */ #define VM_PHYS_SIZE (USRIOSIZE*PAGE_SIZE) #define VM_PHYSSEG_STRAT VM_PSTRAT_BIGFIRST #ifdef XENPV #define VM_PHYSSEG_MAX 1 #define VM_NFREELIST 1 #else #define VM_PHYSSEG_MAX 32 /* 1 "hole" + 31 free lists */ #define VM_NFREELIST 4 #define VM_FREELIST_FIRST16 3 #define VM_FREELIST_FIRST1G 2 #define VM_FREELIST_FIRST4G 1 #endif /* XENPV */ #define VM_FREELIST_DEFAULT 0 #endif /* _I386_VMPARAM_H_ */