sys/arch/i386/include/vmparam.h

   1 /*      $NetBSD: vmparam.h,v 1.81 2014/07/24 13:42:28 riastradh 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         (256*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)     /* 3G max data size */
  72 #endif
  73 #ifndef MAXDSIZ_BU
  74 #define MAXDSIZ_BU      (2U*1024*1024*1024 +    /* 2.5G max data size for */ \
  75                          1U* 512*1024*1024)     /* bottom-up allocation */ \
  76                                                 /* could be a bit more */
  77 #endif
  78 #ifndef DFLSSIZ
  79 #define DFLSSIZ         (2*1024*1024)           /* initial stack size limit */
  80 #endif
  81 #ifndef MAXSSIZ
  82 #define MAXSSIZ         (64*1024*1024)          /* max stack size */
  83 #endif
  84
  85 /*
  86  * IA-32 can't do per-page execute permission, so instead we implement
  87  * two executable segments for %cs, one that covers everything and one
  88  * that excludes some of the address space (currently just the stack).
  89  * I386_MAX_EXE_ADDR is the upper boundary for the smaller segment.
  90  */
  91 #define I386_MAX_EXE_ADDR       (USRSTACK - MAXSSIZ)
  92
  93 /*
  94  * Size of User Raw I/O map
  95  */
  96 #define USRIOSIZE       300
  97
  98 /*
  99  * Mach derived constants
 100  */
 101
 102 /* user/kernel map constants */
 103 #define VM_MIN_ADDRESS          ((vaddr_t)0)
 104 #define VM_MAXUSER_ADDRESS      ((vaddr_t)(PDIR_SLOT_PTE << L2_SHIFT))
 105 #define VM_MAX_ADDRESS          \
 106         ((vaddr_t)((PDIR_SLOT_PTE << L2_SHIFT) + (PDIR_SLOT_PTE << L1_SHIFT)))
 107 #define VM_MIN_KERNEL_ADDRESS   ((vaddr_t)(PDIR_SLOT_KERN << L2_SHIFT))
 108 #define VM_MAX_KERNEL_ADDRESS   ((vaddr_t)((PDIR_SLOT_KERN + NKL2_MAX_ENTRIES) << L2_SHIFT))
 109
 110 /*
 111  * The address to which unspecified mapping requests default
 112  */
 113 #ifdef _KERNEL_OPT
 114 #include "opt_uvm.h"
 115 #include "opt_xen.h"
 116 #endif
 117 #define __USE_TOPDOWN_VM
 118 #define VM_DEFAULT_ADDRESS_TOPDOWN(da, sz) \
 119     trunc_page(USRSTACK - MAXSSIZ - (sz))
 120 #define VM_DEFAULT_ADDRESS_BOTTOMUP(da, sz) \
 121     round_page((vaddr_t)(da) + (vsize_t)MIN(maxdmap, MAXDSIZ_BU))
 122
 123 /* XXX max. amount of KVM to be used by buffers. */
 124 #ifndef VM_MAX_KERNEL_BUF
 125 #define VM_MAX_KERNEL_BUF       (384 * 1024 * 1024)
 126 #endif
 127
 128 /* virtual sizes (bytes) for various kernel submaps */
 129 #define VM_PHYS_SIZE            (USRIOSIZE*PAGE_SIZE)
 130
 131 #define VM_PHYSSEG_STRAT        VM_PSTRAT_BIGFIRST
 132
 133 #ifdef XEN
 134 #define VM_PHYSSEG_MAX          1
 135 #define VM_NFREELIST            1
 136 #else
 137 #define VM_PHYSSEG_MAX          32      /* 1 "hole" + 31 free lists */
 138 #define VM_NFREELIST            4
 139 #define VM_FREELIST_FIRST16     3
 140 #define VM_FREELIST_FIRST1G     2
 141 #define VM_FREELIST_FIRST4G     1
 142 #endif /* XEN */
 143 #define VM_FREELIST_DEFAULT     0
 144
 145 #endif /* _I386_VMPARAM_H_ */