minix/servers/vm/pt.h

   1
   2 #ifndef _PT_H
   3 #define _PT_H 1
   4
   5 #include <machine/vm.h>
   6
   7 #include "vm.h"
   8 #include "pagetable.h"
   9
  10 /* A pagetable. */
  11 typedef struct {
  12         /* Directory entries in VM addr space - root of page table.  */
  13         u32_t *pt_dir;          /* page aligned (ARCH_VM_DIR_ENTRIES) */
  14         u32_t pt_dir_phys;      /* physical address of pt_dir */
  15
  16         /* Pointers to page tables in VM address space. */
  17         u32_t *pt_pt[ARCH_VM_DIR_ENTRIES];
  18
  19         /* When looking for a hole in virtual address space, start
  20          * looking here. This is in linear addresses, i.e.,
  21          * not as the process sees it but the position in the page
  22          * page table. This is just a hint.
  23          */
  24         u32_t pt_virtop;
  25 } pt_t;
  26
  27 #define CLICKSPERPAGE (VM_PAGE_SIZE/CLICK_SIZE)
  28
  29 #endif