minix/servers/vm/region.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

78 lines
2 KiB
C

#ifndef _REGION_H
#define _REGION_H 1
#include <minix/callnr.h>
#include <minix/com.h>
#include <minix/config.h>
#include <minix/const.h>
#include <minix/ds.h>
#include <minix/endpoint.h>
#include <minix/keymap.h>
#include <minix/minlib.h>
#include <minix/type.h>
#include <minix/ipc.h>
#include <minix/sysutil.h>
#include <minix/syslib.h>
#include <minix/const.h>
struct phys_block {
#if SANITYCHECKS
u32_t seencount;
#endif
vir_bytes length; /* no. of contiguous bytes */
phys_bytes phys; /* physical memory */
u8_t refcount; /* Refcount of these pages */
/* first in list of phys_regions that reference this block */
struct phys_region *firstregion;
};
typedef struct phys_region {
struct phys_block *ph;
struct vir_region *parent; /* parent vir_region. */
vir_bytes offset; /* offset from start of vir region */
/* list of phys_regions that reference the same phys_block */
struct phys_region *next_ph_list;
/* AVL fields */
struct phys_region *less, *greater;
int factor;
} phys_region_t;
#include "physravl.h"
struct vir_region {
struct vir_region *next; /* next virtual region in this process */
vir_bytes vaddr; /* virtual address, offset from pagetable */
vir_bytes length; /* length in bytes */
physr_avl *phys; /* avl tree of physical memory blocks */
u16_t flags;
u32_t tag; /* Opaque to mapping code. */
struct vmproc *parent; /* Process that owns this vir_region. */
};
/* Mapping flags: */
#define VR_WRITABLE 0x001 /* Process may write here. */
#define VR_NOPF 0x002 /* May not generate page faults. */
#define VR_PHYS64K 0x004 /* Physical memory must be 64k aligned. */
#define VR_LOWER16MB 0x008
#define VR_LOWER1MB 0x010
/* Mapping type: */
#define VR_ANON 0x100 /* Memory to be cleared and allocated */
#define VR_DIRECT 0x200 /* Mapped, but not managed by VM */
#define VR_SHARED 0x40
/* Tag values: */
#define VRT_NONE 0xBEEF0000
#define VRT_HEAP 0xBEEF0001
#define VRT_CODE 0xBEEF0002
/* map_page_region flags */
#define MF_PREALLOC 0x01
#define MF_CONTIG 0x02
#endif