osfmk/mach/i386/vm_param.h

   1 /*
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   5  *
   6  * The contents of this file constitute Original Code as defined in and
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  22 /*
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  24  */
  25 /*
  26  * Mach Operating System
  27  * Copyright (c) 1991,1990,1989,1988 Carnegie Mellon University
  28  * All Rights Reserved.
  29  *
  30  * Permission to use, copy, modify and distribute this software and its
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  40  * Carnegie Mellon requests users of this software to return to
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  50
  51 /*
  52  * Copyright (c) 1994 The University of Utah and
  53  * the Computer Systems Laboratory at the University of Utah (CSL).
  54  * All rights reserved.
  55  *
  56  * Permission to use, copy, modify and distribute this software is hereby
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  59  * reproduce the notices in supporting documentation, and (3) all advertising
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  62  * Computer Systems Laboratory at the University of Utah.''
  63  *
  64  * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
  65  * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
  66  * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  67  *
  68  * CSL requests users of this software to return to csl-dist@cs.utah.edu any
  69  * improvements that they make and grant CSL redistribution rights.
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  71  */
  72
  73 /*
  74  *      File:   vm_param.h
  75  *      Author: Avadis Tevanian, Jr.
  76  *      Date:   1985
  77  *
  78  *      I386 machine dependent virtual memory parameters.
  79  *      Most of the declarations are preceeded by I386_ (or i386_)
  80  *      which is OK because only I386 specific code will be using
  81  *      them.
  82  */
  83
  84 #ifndef _MACH_I386_VM_PARAM_H_
  85 #define _MACH_I386_VM_PARAM_H_
  86
  87 #define BYTE_SIZE       8       /* byte size in bits */
  88
  89 #define I386_PGBYTES    4096    /* bytes per 80386 page */
  90 #define I386_PGSHIFT    12      /* number of bits to shift for pages */
  91
  92 /*
  93  *      Convert bytes to pages and convert pages to bytes.
  94  *      No rounding is used.
  95  */
  96
  97 #define i386_btop(x)            (((unsigned)(x)) >> I386_PGSHIFT)
  98 #define machine_btop(x)         i386_btop(x)
  99 #define i386_ptob(x)            (((unsigned)(x)) << I386_PGSHIFT)
 100
 101 /*
 102  *      Round off or truncate to the nearest page.  These will work
 103  *      for either addresses or counts.  (i.e. 1 byte rounds to 1 page
 104  *      bytes.
 105  */
 106
 107 #define i386_round_page(x)      ((((unsigned)(x)) + I386_PGBYTES - 1) & \
 108                                         ~(I386_PGBYTES-1))
 109 #define i386_trunc_page(x)      (((unsigned)(x)) & ~(I386_PGBYTES-1))
 110
 111 #define VM_MIN_ADDRESS          ((vm_offset_t) 0)
 112 #define VM_MAX_ADDRESS          ((vm_offset_t) 0xc0000000U)
 113
 114 #define LINEAR_KERNEL_ADDRESS   ((vm_offset_t) 0xc0000000)
 115
 116 #define VM_MIN_KERNEL_ADDRESS   ((vm_offset_t) 0x00000000U)
 117 #define VM_MAX_KERNEL_ADDRESS   ((vm_offset_t) 0x3fffffffU)
 118
 119 #define VM_MIN_KERNEL_LOADED_ADDRESS    ((vm_offset_t) 0x0c000000U)
 120 #define VM_MAX_KERNEL_LOADED_ADDRESS    ((vm_offset_t) 0x1fffffffU)
 121
 122 /* FIXME  - always leave like this? */
 123 #define INTSTACK_SIZE   (I386_PGBYTES*4)
 124 #define KERNEL_STACK_SIZE       (I386_PGBYTES*4)
 125
 126 #if 0           /* FIXME */
 127
 128 #include <norma_vm.h>
 129 #include <task_swapper.h>
 130 #include <thread_swapper.h>
 131
 132 #if defined(AT386)
 133 #include <i386/cpuid.h>
 134 #endif
 135
 136 #if !NORMA_VM
 137 #if !TASK_SWAPPER && !THREAD_SWAPPER
 138 #define KERNEL_STACK_SIZE       (I386_PGBYTES/2)
 139 #else
 140 /* stack needs to be a multiple of page size to get unwired  when swapped */
 141 #define KERNEL_STACK_SIZE       (I386_PGBYTES)
 142 #endif  /* TASK || THREAD SWAPPER */
 143 #define INTSTACK_SIZE           (I386_PGBYTES)  /* interrupt stack size */
 144 #else   /* NORMA_VM */
 145 #define KERNEL_STACK_SIZE       (I386_PGBYTES*2)
 146 #define INTSTACK_SIZE           (I386_PGBYTES*2)        /* interrupt stack size */
 147 #endif  /* NORMA_VM */
 148 #endif  /* MACH_KERNEL */
 149
 150 /*
 151  *      Conversion between 80386 pages and VM pages
 152  */
 153
 154 #define trunc_i386_to_vm(p)     (atop(trunc_page(i386_ptob(p))))
 155 #define round_i386_to_vm(p)     (atop(round_page(i386_ptob(p))))
 156 #define vm_to_i386(p)           (i386_btop(ptoa(p)))
 157
 158 /*
 159  *      Physical memory is mapped 1-1 with virtual memory starting
 160  *      at VM_MIN_KERNEL_ADDRESS.
 161  */
 162 #define phystokv(a)     ((vm_offset_t)(a) + VM_MIN_KERNEL_ADDRESS)
 163
 164 /*
 165  *      For 386 only, ensure that pages are installed in the
 166  *      kernel_pmap with VM_PROT_WRITE enabled.  This avoids
 167  *      code in pmap_enter that disallows a read-only mapping
 168  *      in the kernel's pmap.  (See ri-osc CR1387.)
 169  *
 170  *      An entry in kernel_pmap is made only by the kernel or
 171  *      a collocated server -- by definition (;-)), the requester
 172  *      is trusted code.  If it asked for read-only access,
 173  *      it won't attempt a write.  We don't have to enforce the
 174  *      restriction.  (Naturally, this assumes that any collocated
 175  *      server will _not_ depend on trapping write accesses to pages
 176  *      mapped read-only; this cannot be made to work in the current
 177  *      i386-inspired pmap model.)
 178  */
 179
 180 /*#if defined(AT386)
 181
 182 #define PMAP_ENTER_386_CHECK \
 183         if (cpuid_family == CPUID_FAMILY_386)
 184
 185 #else -- FIXME? We're only running on Pentiums or better */
 186
 187 #define PMAP_ENTER_386_CHECK
 188
 189 /*#endif*/
 190
 191 #define PMAP_ENTER(pmap, virtual_address, page, protection, flags, wired) \
 192         MACRO_BEGIN                                     \
 193         vm_prot_t __prot__ =                            \
 194                 (protection) & ~(page)->page_lock;      \
 195                                                         \
 196         PMAP_ENTER_386_CHECK                            \
 197         if ((pmap) == kernel_pmap)                      \
 198                 __prot__ |= VM_PROT_WRITE;              \
 199         pmap_enter(                                     \
 200                 (pmap),                                 \
 201                 (virtual_address),                      \
 202                 (page)->phys_addr,                      \
 203                 __prot__,                               \
 204                 flags,                                  \
 205                 (wired)                                 \
 206          );                                             \
 207         MACRO_END
 208
 209 #endif  /* _MACH_I386_VM_PARAM_H_ */