minix/servers/vm/i386/pagetable.h
Ben Gras c078ec0331 Basic VM and other minor improvements.
Not complete, probably not fully debugged or optimized.
2008-11-19 12:26:10 +00:00

37 lines
991 B
C

#ifndef _PAGETABLE_H
#define _PAGETABLE_H 1
#include <stdint.h>
#include <sys/vm_i386.h>
/* An i386 pagetable. */
typedef struct {
/* Directory entries in VM addr space - root of page table. */
u32_t *pt_dir; /* page aligned (I386_VM_DIR_ENTRIES) */
u32_t pt_dir_phys; /* physical address of pt_dir */
/* Pointers to page tables in VM address space. */
u32_t *pt_pt[I386_VM_DIR_ENTRIES];
/* When looking for a hole in virtual address space, start
* looking here. This is in linear addresses, i.e.,
* not as the process sees it but the position in the page
* page table. This is just a hint.
*/
u32_t pt_virtop;
} pt_t;
/* Mapping flags. */
#define PTF_WRITE I386_VM_WRITE
#define PTF_PRESENT I386_VM_PRESENT
#define PTF_USER I386_VM_USER
#define PTF_MAPALLOC I386_VM_PTAVAIL1 /* Page allocated by pt code. */
/* For arch-specific PT routines to check if no bits outside
* the regular flags are set.
*/
#define PTF_ALLFLAGS (PTF_WRITE|PTF_PRESENT|PTF_USER)
#endif