minix/servers/vm/i386/pagetable.h
Ben Gras 32fbbd370c - pages that points to page directory values of all processes,
shared with the kernel, mapped into kernel address space; 
   kernel is notified of its location. kernel segment size is
   increased to make it fit.
 - map in kernel and other processes that don't have their
   own page table using single 4MB (global) mapping.
 - new sanity check facility: objects that are allocated with
   the slab allocator are, when running with sanity checking on,
   marked readonly until they are explicitly unlocked using the USE()
   macro.
 - another sanity check facility: collect all uses of memory and
   see if they don't overlap with (a) eachother and (b) free memory
 - own munmap() and munmap_text() functions.
 - exec() recovers from out-of-memory conditions properly now; this
   solves some weird exec() behaviour
 - chew off memory from the same side of the chunk as where we
   start scanning, solving some memory fragmentation issues
 - use avl trees for freelist and phys_ranges in regions
 - implement most useful part of munmap()
 - remap() stuff is GQ's for shared memory
2009-09-21 14:49:49 +00:00

47 lines
1.1 KiB
C

#ifndef _PAGETABLE_H
#define _PAGETABLE_H 1
#include <stdint.h>
#include <sys/vm_i386.h>
#include "../vm.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_GLOBAL I386_VM_GLOBAL
#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|PTF_GLOBAL)
#if SANITYCHECKS
#define PT_SANE(p) { pt_sanitycheck((p), __FILE__, __LINE__); }
#else
#define PT_SANE(p)
#endif
#endif