servers/vm/i386/pagetable.h

   1
   2 #ifndef _PAGETABLE_H
   3 #define _PAGETABLE_H 1
   4
   5 #include <stdint.h>
   6 #include <sys/vm_i386.h>
   7
   8 #include "../vm.h"
   9
  10 /* An i386 pagetable. */
  11 typedef struct {
  12         /* Directory entries in VM addr space - root of page table.  */
  13         u32_t *pt_dir;          /* page aligned (I386_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[I386_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 /* Mapping flags. */
  28 #define PTF_WRITE       I386_VM_WRITE
  29 #define PTF_PRESENT     I386_VM_PRESENT
  30 #define PTF_USER        I386_VM_USER
  31 #define PTF_GLOBAL      I386_VM_GLOBAL
  32 #define PTF_MAPALLOC    I386_VM_PTAVAIL1 /* Page allocated by pt code. */
  33
  34 /* For arch-specific PT routines to check if no bits outside
  35  * the regular flags are set.
  36  */
  37 #define PTF_ALLFLAGS    (PTF_WRITE|PTF_PRESENT|PTF_USER|PTF_GLOBAL)
  38
  39 #if SANITYCHECKS
  40 #define PT_SANE(p) { pt_sanitycheck((p), __FILE__, __LINE__); }
  41 #else
  42 #define PT_SANE(p)
  43 #endif
  44
  45 #endif
  46
  47