osfmk/mach/i386/vm_param.h

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  31 /*
  32  * Mach Operating System
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  78
  79 /*
  80  *      File:   vm_param.h
  81  *      Author: Avadis Tevanian, Jr.
  82  *      Date:   1985
  83  *
  84  *      I386 machine dependent virtual memory parameters.
  85  *      Most of the declarations are preceeded by I386_ (or i386_)
  86  *      which is OK because only I386 specific code will be using
  87  *      them.
  88  */
  89
  90 #ifndef _MACH_I386_VM_PARAM_H_
  91 #define _MACH_I386_VM_PARAM_H_
  92
  93 #define BYTE_SIZE               8               /* byte size in bits */
  94
  95 #define I386_PGBYTES            4096            /* bytes per 80386 page */
  96 #define I386_PGSHIFT            12              /* bitshift for pages */
  97
  98 #define PAGE_SIZE               I386_PGBYTES
  99 #define PAGE_SHIFT              I386_PGSHIFT
 100 #define PAGE_MASK               (PAGE_SIZE - 1)
 101
 102 #define PAGE_MAX_SHIFT          PAGE_SHIFT
 103 #define PAGE_MAX_SIZE           PAGE_SIZE
 104 #define PAGE_MAX_MASK           PAGE_MASK
 105
 106 #define PAGE_MIN_SHIFT          PAGE_SHIFT
 107 #define PAGE_MIN_SIZE           PAGE_SIZE
 108 #define PAGE_MIN_MASK           PAGE_MASK
 109
 110 #define I386_LPGBYTES           2*1024*1024     /* bytes per large page */
 111 #define I386_LPGSHIFT           21              /* bitshift for large pages */
 112 #define I386_LPGMASK            (I386_LPGBYTES-1)
 113
 114 /*
 115  *      Convert bytes to pages and convert pages to bytes.
 116  *      No rounding is used.
 117  */
 118
 119 #define i386_btop(x)            ((ppnum_t)((x) >> I386_PGSHIFT))
 120 #define machine_btop(x)         i386_btop(x)
 121 #define i386_ptob(x)            (((pmap_paddr_t)(x)) << I386_PGSHIFT)
 122 #define machine_ptob(x)         i386_ptob(x)
 123
 124 /*
 125  *      Round off or truncate to the nearest page.  These will work
 126  *      for either addresses or counts.  (i.e. 1 byte rounds to 1 page
 127  *      bytes.
 128  */
 129
 130 #define i386_round_page(x)      ((((pmap_paddr_t)(x)) + I386_PGBYTES - 1) & \
 131                                         ~(I386_PGBYTES-1))
 132 #define i386_trunc_page(x)      (((pmap_paddr_t)(x)) & ~(I386_PGBYTES-1))
 133
 134
 135
 136 #define VM_MIN_ADDRESS64        ((user_addr_t) 0x0000000000000000ULL)
 137 /*
 138  * default top of user stack... it grows down from here
 139  */
 140 #define VM_USRSTACK64           ((user_addr_t) 0x00007FFF5FC00000ULL)
 141 #define VM_DYLD64               ((user_addr_t) 0x00007FFF5FC00000ULL)
 142 #define VM_LIB64_SHR_DATA       ((user_addr_t) 0x00007FFF60000000ULL)
 143 #define VM_LIB64_SHR_TEXT       ((user_addr_t) 0x00007FFF80000000ULL)
 144 /*
 145  * the end of the usable user address space , for now about 47 bits.
 146  * the 64 bit commpage is past the end of this
 147  */
 148 #define VM_MAX_PAGE_ADDRESS     ((user_addr_t) 0x00007FFFFFE00000ULL)
 149 /*
 150  * canonical end of user address space for limits checking
 151  */
 152 #define VM_MAX_USER_PAGE_ADDRESS ((user_addr_t)0x00007FFFFFFFF000ULL)
 153
 154
 155 /* system-wide values */
 156 #define MACH_VM_MIN_ADDRESS             ((mach_vm_offset_t) 0)
 157 #define MACH_VM_MAX_ADDRESS             ((mach_vm_offset_t) VM_MAX_PAGE_ADDRESS)
 158
 159 /* process-relative values (all 32-bit legacy only for now) */
 160 #define VM_MIN_ADDRESS          ((vm_offset_t) 0)
 161 #define VM_USRSTACK32           ((vm_offset_t) 0xC0000000)      /* ASLR slides stack down by up to 1 MB */
 162 #define VM_MAX_ADDRESS          ((vm_offset_t) 0xFFE00000)
 163
 164
 165 #ifdef  KERNEL_PRIVATE
 166
 167 #define TEST_PAGE_SIZE_16K      FALSE
 168 #define TEST_PAGE_SIZE_4K       TRUE
 169
 170 /* Kernel-wide values */
 171
 172 #define KB              (1024ULL)
 173 #define MB              (1024*KB)
 174 #define GB              (1024*MB)
 175
 176 /*
 177  * Maximum physical memory supported.
 178  */
 179 #define K32_MAXMEM      (32*GB)
 180 #define K64_MAXMEM      (252*GB)
 181 #define KERNEL_MAXMEM   K64_MAXMEM
 182
 183 /*
 184  * XXX
 185  * The kernel max VM address is limited to 0xFF3FFFFF for now because
 186  * some data structures are explicitly allocated at 0xFF400000 without
 187  * VM's knowledge (see osfmk/i386/locore.s for the allocation of PTmap and co.).
 188  * We can't let VM allocate memory from there.
 189  */
 190
 191
 192 #define KERNEL_IMAGE_TO_PHYS(x) (x)
 193 #define VM_MIN_KERNEL_ADDRESS           ((vm_offset_t) 0xFFFFFF8000000000UL)
 194 #define VM_MIN_KERNEL_PAGE              ((ppnum_t)0)
 195 #define VM_MIN_KERNEL_AND_KEXT_ADDRESS  (VM_MIN_KERNEL_ADDRESS - 0x80000000ULL)
 196 #define VM_MAX_KERNEL_ADDRESS           ((vm_offset_t) 0xFFFFFFFFFFFFEFFFUL)
 197 #define VM_MAX_KERNEL_ADDRESS_EFI32     ((vm_offset_t) 0xFFFFFF80FFFFEFFFUL)
 198 #define KEXT_ALLOC_MAX_OFFSET (2 * 1024 * 1024 * 1024UL)
 199 #define KEXT_ALLOC_BASE(x)  ((x) - KEXT_ALLOC_MAX_OFFSET)
 200 #define KEXT_ALLOC_SIZE(x)  (KEXT_ALLOC_MAX_OFFSET - (x))
 201
 202
 203 #define KERNEL_STACK_SIZE       (I386_PGBYTES*4)
 204
 205 #define VM_MAP_MIN_ADDRESS      MACH_VM_MIN_ADDRESS
 206 #define VM_MAP_MAX_ADDRESS      MACH_VM_MAX_ADDRESS
 207
 208 /* FIXME  - always leave like this? */
 209 #define INTSTACK_SIZE   (I386_PGBYTES*4)
 210
 211 #ifdef  MACH_KERNEL_PRIVATE
 212
 213 /* For implementing legacy 32-bit interfaces */
 214 #define VM32_SUPPORT                    1
 215 #define VM32_MIN_ADDRESS                ((vm32_offset_t) 0)
 216 #define VM32_MAX_ADDRESS                ((vm32_offset_t) (VM_MAX_PAGE_ADDRESS & 0xFFFFFFFF))
 217
 218 /*
 219  * kalloc() parameters:
 220  *
 221  * Historically kalloc's underlying zones were power-of-2 sizes, with a
 222  * KALLOC_MINSIZE of 16 bytes.  The allocator ensured that
 223  * (sizeof == alignof) >= 16 for all kalloc allocations.
 224  *
 225  * Today kalloc may use zones with intermediate sizes, constrained by
 226  * KALLOC_MINSIZE and a minimum alignment, expressed by KALLOC_LOG2_MINALIGN.
 227  *
 228  * The common alignment for LP64 is for longs and pointers i.e. 8 bytes.
 229  */
 230
 231
 232 #define KALLOC_MINSIZE          16      /* minimum allocation size */
 233 #define KALLOC_LOG2_MINALIGN    4       /* log2 minimum alignment */
 234
 235 #define LINEAR_KERNEL_ADDRESS   ((vm_offset_t) 0x00000000)
 236
 237 #define VM_MIN_KERNEL_LOADED_ADDRESS    ((vm_offset_t) 0xFFFFFF8000000000UL)
 238 #define VM_MAX_KERNEL_LOADED_ADDRESS    ((vm_offset_t) 0xFFFFFF801FFFFFFFUL)
 239
 240 #define NCOPY_WINDOWS 0
 241
 242
 243
 244 /*
 245  *      Conversion between 80386 pages and VM pages
 246  */
 247
 248 #define trunc_i386_to_vm(p)     (atop(trunc_page(i386_ptob(p))))
 249 #define round_i386_to_vm(p)     (atop(round_page(i386_ptob(p))))
 250 #define vm_to_i386(p)           (i386_btop(ptoa(p)))
 251
 252
 253 #define PMAP_SET_CACHE_ATTR(mem, object, cache_attr, batch_pmap_op)     \
 254         MACRO_BEGIN                                                     \
 255                 pmap_set_cache_attributes(VM_PAGE_GET_PHYS_PAGE(mem), (cache_attr));    \
 256                 (object)->set_cache_attr = TRUE;                                \
 257                 (void) batch_pmap_op;                                   \
 258         MACRO_END
 259
 260 #define PMAP_BATCH_SET_CACHE_ATTR(object, user_page_list, cache_attr, num_pages, batch_pmap_op)\
 261         MACRO_BEGIN                                                     \
 262         (void) user_page_list;                                          \
 263         (void) num_pages;                                               \
 264         (void) batch_pmap_op;                                           \
 265         MACRO_END
 266
 267 #define IS_USERADDR64_CANONICAL(addr)                   \
 268         ((addr) < (VM_MAX_USER_PAGE_ADDRESS + PAGE_SIZE))
 269
 270 #endif  /* MACH_KERNEL_PRIVATE */
 271
 272 #endif  /* KERNEL_PRIVATE */
 273
 274 #endif  /* _MACH_I386_VM_PARAM_H_ */