sys/arch/i386/include/vmparam.h

   1 /*      $NetBSD: vmparam.h,v 1.69 2008/12/13 14:07:10 pooka Exp $       */
   2
   3 /*-
   4  * Copyright (c) 1990 The Regents of the University of California.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * William Jolitz.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  *      @(#)vmparam.h   5.9 (Berkeley) 5/12/91
  35  */
  36
  37 #ifndef _I386_VMPARAM_H_
  38 #define _I386_VMPARAM_H_
  39
  40 #include <sys/tree.h>
  41 #include <sys/mutex.h>
  42
  43 /*
  44  * Machine dependent constants for 386.
  45  */
  46
  47 /*
  48  * Page size on the IA-32 is not variable in the traditional sense.
  49  * We override the PAGE_* definitions to compile-time constants.
  50  */
  51 #define PAGE_SHIFT      12
  52 #define PAGE_SIZE       (1 << PAGE_SHIFT)
  53 #define PAGE_MASK       (PAGE_SIZE - 1)
  54
  55 /*
  56  * Virtual address space arrangement. On 386, both user and kernel
  57  * share the address space, not unlike the vax.
  58  * USRSTACK is the top (end) of the user stack. Immediately above the
  59  * user stack is the page table map, and then kernel address space.
  60  */
  61 #define USRSTACK        VM_MAXUSER_ADDRESS
  62
  63 /*
  64  * Virtual memory related constants, all in bytes
  65  */
  66 #define MAXTSIZ         (64*1024*1024)          /* max text size */
  67 #ifndef DFLDSIZ
  68 #define DFLDSIZ         (256*1024*1024)         /* initial data size limit */
  69 #endif
  70 #ifndef MAXDSIZ
  71 #define MAXDSIZ         (3U*1024*1024*1024)     /* max data size */
  72 #endif
  73 #ifndef DFLSSIZ
  74 #define DFLSSIZ         (2*1024*1024)           /* initial stack size limit */
  75 #endif
  76 #ifndef MAXSSIZ
  77 #define MAXSSIZ         (64*1024*1024)          /* max stack size */
  78 #endif
  79
  80 /*
  81  * IA-32 can't do per-page execute permission, so instead we implement
  82  * two executable segments for %cs, one that covers everything and one
  83  * that excludes some of the address space (currently just the stack).
  84  * I386_MAX_EXE_ADDR is the upper boundary for the smaller segment.
  85  */
  86 #define I386_MAX_EXE_ADDR       (USRSTACK - MAXSSIZ)
  87
  88 /*
  89  * Size of User Raw I/O map
  90  */
  91 #define USRIOSIZE       300
  92
  93 /*
  94  * Mach derived constants
  95  */
  96
  97 /* user/kernel map constants */
  98 #define VM_MIN_ADDRESS          ((vaddr_t)0)
  99 #define VM_MAXUSER_ADDRESS      ((vaddr_t)(PDIR_SLOT_PTE << L2_SHIFT))
 100 #define VM_MAX_ADDRESS          \
 101         ((vaddr_t)((PDIR_SLOT_PTE << L2_SHIFT) + (PDIR_SLOT_PTE << L1_SHIFT)))
 102 #define VM_MIN_KERNEL_ADDRESS   ((vaddr_t)(PDIR_SLOT_KERN << L2_SHIFT))
 103 #define VM_MAX_KERNEL_ADDRESS   ((vaddr_t)(PDIR_SLOT_APTE << L2_SHIFT))
 104
 105 /*
 106  * The address to which unspecified mapping requests default
 107  */
 108 #ifdef _KERNEL_OPT
 109 #include "opt_uvm.h"
 110 #include "opt_xen.h"
 111 #endif
 112 #define __USE_TOPDOWN_VM
 113 #define VM_DEFAULT_ADDRESS(da, sz) \
 114         trunc_page(USRSTACK - MAXSSIZ - (sz))
 115
 116 /* XXX max. amount of KVM to be used by buffers. */
 117 #ifndef VM_MAX_KERNEL_BUF
 118 #define VM_MAX_KERNEL_BUF       (384 * 1024 * 1024)
 119 #endif
 120
 121 /* virtual sizes (bytes) for various kernel submaps */
 122 #define VM_PHYS_SIZE            (USRIOSIZE*PAGE_SIZE)
 123
 124 #define VM_PHYSSEG_STRAT        VM_PSTRAT_BIGFIRST
 125 #define VM_PHYSSEG_NOADD                /* can't add RAM after vm_mem_init */
 126
 127 #ifdef XEN
 128 #define VM_PHYSSEG_MAX          1
 129 #define VM_NFREELIST            1
 130 #else
 131 #define VM_PHYSSEG_MAX          10      /* 1 "hole" + 9 free lists */
 132 #define VM_NFREELIST            2
 133 #define VM_FREELIST_FIRST16     1
 134 #endif /* XEN */
 135 #define VM_FREELIST_DEFAULT     0
 136
 137 #include <x86/pmap_pv.h>
 138
 139 #define __HAVE_VM_PAGE_MD
 140 #define VM_MDPAGE_INIT(pg) \
 141         memset(&(pg)->mdpage, 0, sizeof((pg)->mdpage)); \
 142         PMAP_PAGE_INIT(&(pg)->mdpage.mp_pp)
 143
 144 struct vm_page_md {
 145         struct pmap_page mp_pp;
 146 };
 147
 148 #endif /* _I386_VMPARAM_H_ */