sys/arch/acorn26/include/vmparam.h

   1 /*      $NetBSD: vmparam.h,v 1.8 2007/10/25 13:03:03 yamt Exp $ */
   2
   3 /*
   4  * Copyright (c) 1988 The Regents of the University of California.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #ifndef _ARM26_VMPARAM_H_
  33 #define _ARM26_VMPARAM_H_
  34
  35 #define __USE_TOPDOWN_VM
  36
  37 /*
  38  * Page size on the 26-bit ARM CPUs is not variable in the traditional
  39  * sense.  We override the PAGE_* definitions to compile-time constants.
  40  */
  41 #define PAGE_SHIFT      15
  42 #define PAGE_SIZE       (1 << PAGE_SHIFT)
  43 #define PAGE_MASK       (PAGE_SIZE - 1)
  44
  45 #define USRSTACK        VM_MAXUSER_ADDRESS
  46
  47 #define MAXTSIZ         (0x007f8000)            /* max text size */
  48 #ifndef DFLDSIZ
  49 #define DFLDSIZ         (0x01800000)            /* initial data size limit */
  50 #endif
  51 #ifndef MAXDSIZ
  52 #define MAXDSIZ         (0x01800000)            /* max data size */
  53 #endif
  54 #ifndef DFLSSIZ
  55 #define DFLSSIZ         (512*1024)              /* initial stack size limit */
  56 #endif
  57 #ifndef MAXSSIZ
  58 #define MAXSSIZ         (0x00200000)            /* max stack size */
  59 #endif
  60
  61 /*
  62  * Override the default pager_map size, there's not enough KVA.
  63  */
  64 #define PAGER_MAP_DEFAULT_SIZE          (1 * 1024 * 1024)
  65
  66 /*
  67  * Mach derived constants
  68  */
  69
  70 /* Need to link some of these with some in param.h */
  71
  72 /*
  73  * These specify the range of virtual pages available to user
  74  * processes and to the kernel.  This is a bit of a delicate balancing
  75  * act, as we've only got 32Mb between them.  There should probably be
  76  * an option to have separate kernel and user spaces to ease this.
  77  */
  78
  79 #define KVM_SIZE                0x00800000 /* 8Mb */
  80
  81 /* User VM range */
  82 #define VM_MIN_ADDRESS          ((vm_offset_t)0x00008000)
  83 #define VM_MAX_ADDRESS          ((vm_offset_t)0x02000000 - KVM_SIZE)
  84 #define VM_MAXUSER_ADDRESS      VM_MAX_ADDRESS
  85
  86 /* Kernel VM range */
  87 #define VM_MIN_KERNEL_ADDRESS   VM_MAX_ADDRESS
  88 #define VM_MAX_KERNEL_ADDRESS   ((vm_offset_t)0x02000000)
  89 #define VM_MAXKERN_ADDRESS      VM_MAX_KERNEL_ADDRESS
  90
  91 /* XXX max. amount of KVM to be used by buffers. */
  92 #ifndef VM_MAX_KERNEL_BUF
  93 #define VM_MAX_KERNEL_BUF \
  94         ((VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS) / 4)
  95 #endif
  96
  97 /* Physical memory parameters */
  98
  99 #define VM_PHYSSEG_MAX          3
 100
 101 #define VM_PHYSSEG_STRAT        VM_PSTRAT_BIGFIRST
 102
 103 #define VM_PHYSSEG_NOADD        /* We won't turn up extra memory during autoconfig */
 104
 105 #define VM_NFREELIST            2
 106 #define VM_FREELIST_LOW         1 /* DMA-able memory (bottom 512k phys) */
 107 #define VM_FREELIST_DEFAULT     0 /* The rest */
 108
 109 #endif /* _ARM26_VMPARAM_H_ */
 110
 111 /* End of vmparam.h */