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/* $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 <sys/mutex.h>
#include <machine/pte.h>
/*
* 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_ */
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