minix/sys/arch/i386/include/vmparam.h

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/* $NetBSD: vmparam.h,v 1.76 2012/11/13 14:10:24 chs Exp $ */
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/*-
* 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 <sys/tree.h>
#include <sys/mutex.h>
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/*
* 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) /* max data size */
#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
/*
* 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))
#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(da, sz) \
trunc_page(USRSTACK - MAXSSIZ - (sz))
/* XXX max. amount of KVM to be used by buffers. */
#ifndef VM_MAX_KERNEL_BUF
#define VM_MAX_KERNEL_BUF (384 * 1024 * 1024)
#endif
/* virtual sizes (bytes) for various kernel submaps */
#define VM_PHYS_SIZE (USRIOSIZE*PAGE_SIZE)
#define VM_PHYSSEG_STRAT VM_PSTRAT_BIGFIRST
#ifdef XEN
#define VM_PHYSSEG_MAX 1
#define VM_NFREELIST 1
#else
#define VM_PHYSSEG_MAX 32 /* 1 "hole" + 31 free lists */
#define VM_NFREELIST 2
#define VM_FREELIST_FIRST16 1
#endif /* XEN */
#define VM_FREELIST_DEFAULT 0
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#endif /* _I386_VMPARAM_H_ */