include/sys/vm.h

   1 /*
   2 sys/vm.h
   3 */
   4
   5 #define PAGE_SIZE       4096
   6
   7 /* MIOCMAP */
   8 struct mapreq
   9 {
  10         void *base;
  11         size_t size;
  12         off_t offset;
  13         int readonly;
  14 };
  15
  16 /* i386 paging constants */
  17 #define I386_VM_PRESENT 0x001   /* Page is present */
  18 #define I386_VM_WRITE   0x002   /* Read/write access allowed */
  19 #define I386_VM_USER    0x004   /* User access allowed */
  20 #define I386_VM_PWT     0x008   /* Write through */
  21 #define I386_VM_PCD     0x010   /* Cache disable */
  22 #define I386_VM_ADDR_MASK 0xFFFFF000 /* physical address */
  23
  24 #define I386_VM_PT_ENT_SIZE     4       /* Size of a page table entry */
  25 #define I386_VM_DIR_ENTRIES     1024    /* Number of entries in a page dir */
  26 #define I386_VM_DIR_ENT_SHIFT   22      /* Shift to get entry in page dir. */
  27 #define I386_VM_PT_ENT_SHIFT    12      /* Shift to get entry in page table */
  28 #define I386_VM_PT_ENT_MASK     0x3FF   /* Mask to get entry in page table */
  29
  30 #define I386_CR0_PG             0x80000000      /* Enable paging */