osfmk/mach/i386/vm_param.h

   1 /*
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  25 /*
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  27  */
  28 /*
  29  * Mach Operating System
  30  * Copyright (c) 1991,1990,1989,1988 Carnegie Mellon University
  31  * All Rights Reserved.
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  33  * Permission to use, copy, modify and distribute this software and its
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  54 /*
  55  * Copyright (c) 1994 The University of Utah and
  56  * the Computer Systems Laboratory at the University of Utah (CSL).
  57  * All rights reserved.
  58  *
  59  * Permission to use, copy, modify and distribute this software is hereby
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  65  * Computer Systems Laboratory at the University of Utah.''
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  67  * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
  68  * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
  69  * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  70  *
  71  * CSL requests users of this software to return to csl-dist@cs.utah.edu any
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  74  */
  75
  76 /*
  77  *      File:   vm_param.h
  78  *      Author: Avadis Tevanian, Jr.
  79  *      Date:   1985
  80  *
  81  *      I386 machine dependent virtual memory parameters.
  82  *      Most of the declarations are preceeded by I386_ (or i386_)
  83  *      which is OK because only I386 specific code will be using
  84  *      them.
  85  */
  86
  87 #ifndef _MACH_I386_VM_PARAM_H_
  88 #define _MACH_I386_VM_PARAM_H_
  89
  90 #define BYTE_SIZE       8       /* byte size in bits */
  91
  92 #define I386_PGBYTES    4096    /* bytes per 80386 page */
  93 #define I386_PGSHIFT    12      /* number of bits to shift for pages */
  94
  95 /*
  96  *      Convert bytes to pages and convert pages to bytes.
  97  *      No rounding is used.
  98  */
  99
 100 #define i386_btop(x)            (((unsigned)(x)) >> I386_PGSHIFT)
 101 #define machine_btop(x)         i386_btop(x)
 102 #define i386_ptob(x)            (((unsigned)(x)) << I386_PGSHIFT)
 103
 104 /*
 105  *      Round off or truncate to the nearest page.  These will work
 106  *      for either addresses or counts.  (i.e. 1 byte rounds to 1 page
 107  *      bytes.
 108  */
 109
 110 #define i386_round_page(x)      ((((unsigned)(x)) + I386_PGBYTES - 1) & \
 111                                         ~(I386_PGBYTES-1))
 112 #define i386_trunc_page(x)      (((unsigned)(x)) & ~(I386_PGBYTES-1))
 113
 114 #define VM_MIN_ADDRESS          ((vm_offset_t) 0)
 115 #define VM_MAX_ADDRESS          ((vm_offset_t) 0xc0000000U)
 116
 117 #define LINEAR_KERNEL_ADDRESS   ((vm_offset_t) 0xc0000000)
 118
 119 #define VM_MIN_KERNEL_ADDRESS   ((vm_offset_t) 0x00000000U)
 120 #define VM_MAX_KERNEL_ADDRESS   ((vm_offset_t) 0x3fffffffU)
 121
 122 #define VM_MIN_KERNEL_LOADED_ADDRESS    ((vm_offset_t) 0x0c000000U)
 123 #define VM_MAX_KERNEL_LOADED_ADDRESS    ((vm_offset_t) 0x1fffffffU)
 124
 125 /* FIXME  - always leave like this? */
 126 #define INTSTACK_SIZE   (I386_PGBYTES*4)
 127 #define KERNEL_STACK_SIZE       (I386_PGBYTES*4)
 128
 129 #if 0           /* FIXME */
 130
 131 #include <norma_vm.h>
 132 #include <task_swapper.h>
 133 #include <thread_swapper.h>
 134
 135 #if defined(AT386)
 136 #include <i386/cpuid.h>
 137 #endif
 138
 139 #if !NORMA_VM
 140 #if !TASK_SWAPPER && !THREAD_SWAPPER
 141 #define KERNEL_STACK_SIZE       (I386_PGBYTES/2)
 142 #else
 143 /* stack needs to be a multiple of page size to get unwired  when swapped */
 144 #define KERNEL_STACK_SIZE       (I386_PGBYTES)
 145 #endif  /* TASK || THREAD SWAPPER */
 146 #define INTSTACK_SIZE           (I386_PGBYTES)  /* interrupt stack size */
 147 #else   /* NORMA_VM */
 148 #define KERNEL_STACK_SIZE       (I386_PGBYTES*2)
 149 #define INTSTACK_SIZE           (I386_PGBYTES*2)        /* interrupt stack size */
 150 #endif  /* NORMA_VM */
 151 #endif  /* MACH_KERNEL */
 152
 153 /*
 154  *      Conversion between 80386 pages and VM pages
 155  */
 156
 157 #define trunc_i386_to_vm(p)     (atop(trunc_page(i386_ptob(p))))
 158 #define round_i386_to_vm(p)     (atop(round_page(i386_ptob(p))))
 159 #define vm_to_i386(p)           (i386_btop(ptoa(p)))
 160
 161 /*
 162  *      Physical memory is mapped 1-1 with virtual memory starting
 163  *      at VM_MIN_KERNEL_ADDRESS.
 164  */
 165 #define phystokv(a)     ((vm_offset_t)(a) + VM_MIN_KERNEL_ADDRESS)
 166
 167 /*
 168  *      For 386 only, ensure that pages are installed in the
 169  *      kernel_pmap with VM_PROT_WRITE enabled.  This avoids
 170  *      code in pmap_enter that disallows a read-only mapping
 171  *      in the kernel's pmap.  (See ri-osc CR1387.)
 172  *
 173  *      An entry in kernel_pmap is made only by the kernel or
 174  *      a collocated server -- by definition (;-)), the requester
 175  *      is trusted code.  If it asked for read-only access,
 176  *      it won't attempt a write.  We don't have to enforce the
 177  *      restriction.  (Naturally, this assumes that any collocated
 178  *      server will _not_ depend on trapping write accesses to pages
 179  *      mapped read-only; this cannot be made to work in the current
 180  *      i386-inspired pmap model.)
 181  */
 182
 183 /*#if defined(AT386)
 184
 185 #define PMAP_ENTER_386_CHECK \
 186         if (cpuid_family == CPUID_FAMILY_386)
 187
 188 #else -- FIXME? We're only running on Pentiums or better */
 189
 190 #define PMAP_ENTER_386_CHECK
 191
 192 /*#endif*/
 193
 194 #define PMAP_ENTER(pmap, virtual_address, page, protection, flags, wired) \
 195         MACRO_BEGIN                                     \
 196         vm_prot_t __prot__ =                            \
 197                 (protection) & ~(page)->page_lock;      \
 198                                                         \
 199         PMAP_ENTER_386_CHECK                            \
 200         if ((pmap) == kernel_pmap)                      \
 201                 __prot__ |= VM_PROT_WRITE;              \
 202         pmap_enter(                                     \
 203                 (pmap),                                 \
 204                 (virtual_address),                      \
 205                 (page)->phys_addr,                      \
 206                 __prot__,                               \
 207                 flags,                                  \
 208                 (wired)                                 \
 209          );                                             \
 210         MACRO_END
 211
 212 #endif  /* _MACH_I386_VM_PARAM_H_ */