98a8e8b486
(domU only). PAE support is enabled by 'options PAE', see the new XEN3PAE_DOMU
and INSTALL_XEN3PAE_DOMU kernel config files.
See the comments in arch/i386/include/{pte.h,pmap.h} to see how it works.
In short, we still handle it as a 2-level MMU, with the second level page
directory being 4 pages in size. pmap switching is done by switching the
L2 pages in the L3 entries, instead of loading %cr3. This is almost required
by Xen, which handle the last L2 page (the one mapping 0xc0000000 - 0xffffffff)
in a very special way. But this approach should also work for native PAE
support if ever supported (in fact, the pmap should almost suport native
PAE, what's missing is bootstrap code in locore.S).
156 lines
4.7 KiB
C
156 lines
4.7 KiB
C
/* $NetBSD: vmparam.h,v 1.68 2008/01/23 19:46:44 bouyer 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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* @(#)vmparam.h 5.9 (Berkeley) 5/12/91
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*/
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#ifndef _VMPARAM_H_
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#define _VMPARAM_H_
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#include <sys/tree.h>
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#include <sys/mutex.h>
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/*
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* Machine dependent constants for 386.
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*/
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/*
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* Page size on the IA-32 is not variable in the traditional sense.
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* We override the PAGE_* definitions to compile-time constants.
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*/
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#define PAGE_SHIFT 12
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#define PAGE_SIZE (1 << PAGE_SHIFT)
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#define PAGE_MASK (PAGE_SIZE - 1)
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/*
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* Virtual address space arrangement. On 386, both user and kernel
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* share the address space, not unlike the vax.
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* USRSTACK is the top (end) of the user stack. Immediately above the
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* user stack is the page table map, and then kernel address space.
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*/
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#define USRSTACK VM_MAXUSER_ADDRESS
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/*
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* Virtual memory related constants, all in bytes
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*/
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#define MAXTSIZ (64*1024*1024) /* max text size */
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#ifndef DFLDSIZ
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#define DFLDSIZ (256*1024*1024) /* initial data size limit */
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#endif
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#ifndef MAXDSIZ
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#define MAXDSIZ (3U*1024*1024*1024) /* max data size */
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#endif
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#ifndef DFLSSIZ
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#define DFLSSIZ (2*1024*1024) /* initial stack size limit */
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#endif
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#ifndef MAXSSIZ
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#define MAXSSIZ (64*1024*1024) /* max stack size */
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#endif
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/*
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* IA-32 can't do per-page execute permission, so instead we implement
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* two executable segments for %cs, one that covers everything and one
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* that excludes some of the address space (currently just the stack).
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* I386_MAX_EXE_ADDR is the upper boundary for the smaller segment.
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*/
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#define I386_MAX_EXE_ADDR (USRSTACK - MAXSSIZ)
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/*
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* Size of shared memory map
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*/
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#ifndef SHMMAXPGS
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#define SHMMAXPGS 2048
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#endif
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/*
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* Size of User Raw I/O map
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*/
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#define USRIOSIZE 300
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/*
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* Mach derived constants
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*/
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/* user/kernel map constants */
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#define VM_MIN_ADDRESS ((vaddr_t)0)
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#define VM_MAXUSER_ADDRESS ((vaddr_t)(PDIR_SLOT_PTE << L2_SHIFT))
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#define VM_MAX_ADDRESS \
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((vaddr_t)((PDIR_SLOT_PTE << L2_SHIFT) + (PDIR_SLOT_PTE << L1_SHIFT)))
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#define VM_MIN_KERNEL_ADDRESS ((vaddr_t)(PDIR_SLOT_KERN << L2_SHIFT))
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#define VM_MAX_KERNEL_ADDRESS ((vaddr_t)(PDIR_SLOT_APTE << L2_SHIFT))
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/*
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* The address to which unspecified mapping requests default
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*/
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#ifdef _KERNEL_OPT
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#include "opt_uvm.h"
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#include "opt_xen.h"
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#endif
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#define __USE_TOPDOWN_VM
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#define VM_DEFAULT_ADDRESS(da, sz) \
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trunc_page(USRSTACK - MAXSSIZ - (sz))
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/* XXX max. amount of KVM to be used by buffers. */
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#ifndef VM_MAX_KERNEL_BUF
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#define VM_MAX_KERNEL_BUF (384 * 1024 * 1024)
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#endif
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/* virtual sizes (bytes) for various kernel submaps */
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#define VM_PHYS_SIZE (USRIOSIZE*PAGE_SIZE)
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#define VM_PHYSSEG_STRAT VM_PSTRAT_BIGFIRST
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#define VM_PHYSSEG_NOADD /* can't add RAM after vm_mem_init */
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#ifdef XEN
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#define VM_PHYSSEG_MAX 1
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#define VM_NFREELIST 1
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#else
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#define VM_PHYSSEG_MAX 10 /* 1 "hole" + 9 free lists */
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#define VM_NFREELIST 2
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#define VM_FREELIST_FIRST16 1
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#endif /* XEN */
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#define VM_FREELIST_DEFAULT 0
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#include <x86/pmap_pv.h>
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#define __HAVE_VM_PAGE_MD
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#define VM_MDPAGE_INIT(pg) \
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memset(&(pg)->mdpage, 0, sizeof((pg)->mdpage)); \
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PMAP_PAGE_INIT(&(pg)->mdpage.mp_pp)
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struct vm_page_md {
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struct pmap_page mp_pp;
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};
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#endif /* _VMPARAM_H_ */
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