LCOM1920-T02G10

/*        $NetBSD: vmparam.h,v 1.81 2014/07/24 13:42:28 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/tree.h>

#include <sys/mutex.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

/*

 * 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_TOPDOWN(da, sz) \

    trunc_page(USRSTACK - MAXSSIZ - (sz))

#define VM_DEFAULT_ADDRESS_BOTTOMUP(da, sz) \

    round_page((vaddr_t)(da) + (vsize_t)MIN(maxdmap, MAXDSIZ_BU))

/* 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                4

#define        VM_FREELIST_FIRST16        3

#define        VM_FREELIST_FIRST1G        2

#define        VM_FREELIST_FIRST4G        1

#endif /* XEN */

#define        VM_FREELIST_DEFAULT        0

#endif /* _I386_VMPARAM_H_ */