osfmk/mach/i386/vm_param.h

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  33 /*
  34  * Mach Operating System
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  36  * All Rights Reserved.
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  38  * Permission to use, copy, modify and distribute this software and its
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  59 /*
  60  * Copyright (c) 1994 The University of Utah and
  61  * the Computer Systems Laboratory at the University of Utah (CSL).
  62  * All rights reserved.
  63  *
  64  * Permission to use, copy, modify and distribute this software is hereby
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  73  * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
  74  * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  75  *
  76  * CSL requests users of this software to return to csl-dist@cs.utah.edu any
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  80
  81 /*
  82  *      File:   vm_param.h
  83  *      Author: Avadis Tevanian, Jr.
  84  *      Date:   1985
  85  *
  86  *      I386 machine dependent virtual memory parameters.
  87  *      Most of the declarations are preceeded by I386_ (or i386_)
  88  *      which is OK because only I386 specific code will be using
  89  *      them.
  90  */
  91
  92 #ifndef _MACH_I386_VM_PARAM_H_
  93 #define _MACH_I386_VM_PARAM_H_
  94
  95 #define BYTE_SIZE               8               /* byte size in bits */
  96
  97 #define I386_PGBYTES    4096    /* bytes per 80386 page */
  98 #define I386_PGSHIFT    12              /* number of bits to shift for pages */
  99
 100 #define PAGE_SIZE               I386_PGBYTES
 101 #define PAGE_SHIFT              I386_PGSHIFT
 102 #define PAGE_MASK               (PAGE_SIZE - 1)
 103
 104 /*
 105  *      Convert bytes to pages and convert pages to bytes.
 106  *      No rounding is used.
 107  */
 108
 109 #define i386_btop(x)            (((pmap_paddr_t)(x)) >> I386_PGSHIFT)
 110 #define machine_btop(x)         i386_btop(x)
 111 #define i386_ptob(x)            (((pmap_paddr_t)(x)) << I386_PGSHIFT)
 112
 113 /*
 114  *      Round off or truncate to the nearest page.  These will work
 115  *      for either addresses or counts.  (i.e. 1 byte rounds to 1 page
 116  *      bytes.
 117  */
 118
 119 #define i386_round_page(x)      ((((pmap_paddr_t)(x)) + I386_PGBYTES - 1) & \
 120                                         ~(I386_PGBYTES-1))
 121 #define i386_trunc_page(x)      (((pmap_paddr_t)(x)) & ~(I386_PGBYTES-1))
 122
 123 #define VM_MAX_PAGE_ADDRESS     0x00000000C0000000ULL
 124
 125 /* system-wide values */
 126 #define MACH_VM_MIN_ADDRESS             ((mach_vm_offset_t) 0)
 127 #define MACH_VM_MAX_ADDRESS             ((mach_vm_offset_t) VM_MAX_PAGE_ADDRESS)
 128
 129 /* process-relative values (all 32-bit legacy only for now) */
 130 #define VM_MIN_ADDRESS          ((vm_offset_t) 0)
 131 #define VM_MAX_ADDRESS          ((vm_offset_t) (VM_MAX_PAGE_ADDRESS & 0xFFFFFFFF))
 132
 133 #ifdef  KERNEL_PRIVATE
 134
 135 /* Kernel-wide values */
 136 #define VM_MIN_KERNEL_ADDRESS   ((vm_offset_t) 0xC0000000U)
 137 #define VM_MAX_KERNEL_ADDRESS   ((vm_offset_t) 0xFfffffffU)
 138 #define KERNEL_STACK_SIZE               (I386_PGBYTES*4)
 139
 140 /* FIXME  - always leave like this? */
 141 #define INTSTACK_SIZE   (I386_PGBYTES*4)
 142
 143 #ifdef  MACH_KERNEL_PRIVATE
 144
 145 /* For implementing legacy 32-bit interfaces */
 146 #define VM32_SUPPORT
 147 #define VM32_MIN_ADDRESS                ((vm32_offset_t) 0)
 148 #define VM32_MAX_ADDRESS                ((vm32_offset_t) (VM_MAX_PAGE_ADDRESS & 0xFFFFFFFF))
 149
 150 #define LINEAR_KERNEL_ADDRESS   ((vm_offset_t) 0xc0000000)
 151
 152 #define VM_MIN_KERNEL_LOADED_ADDRESS    ((vm_offset_t) 0x0c000000U)
 153 #define VM_MAX_KERNEL_LOADED_ADDRESS    ((vm_offset_t) 0x1fffffffU)
 154
 155 /*
 156  *      Conversion between 80386 pages and VM pages
 157  */
 158
 159 #define trunc_i386_to_vm(p)     (atop(trunc_page(i386_ptob(p))))
 160 #define round_i386_to_vm(p)     (atop(round_page(i386_ptob(p))))
 161 #define vm_to_i386(p)           (i386_btop(ptoa(p)))
 162
 163 #define PMAP_ENTER(pmap, virtual_address, page, protection, flags, wired) \
 164         MACRO_BEGIN                                     \
 165         pmap_t __pmap = (pmap);                         \
 166         vm_page_t __page = (page);                      \
 167         vm_prot_t __prot__ =                            \
 168                 (protection) & ~(page)->page_lock;      \
 169                                                         \
 170         if (__pmap == kernel_pmap) {                    \
 171                 __prot__ |= VM_PROT_WRITE;              \
 172         } else {                                        \
 173                 assert(!__page->encrypted);             \
 174         }                                               \
 175                                                         \
 176         pmap_enter(                                     \
 177                 __pmap,                                 \
 178                 (virtual_address),                      \
 179                 __page->phys_page,                      \
 180                 __prot__,                               \
 181                 flags,                                  \
 182                 (wired)                                 \
 183          );                                             \
 184         MACRO_END
 185
 186 #endif  /* MACH_KERNEL_PRIVATE */
 187
 188 #endif  /* KERNEL_PRIVATE */
 189
 190 #endif  /* _MACH_I386_VM_PARAM_H_ */