minix/servers/vm/region.h
Cristiano Giuffrida c5b309ff07 Merge of Wu's GSOC 09 branch (src.20090525.r4372.wu)
Main changes:
- COW optimization for safecopy.
- safemap, a grant-based interface for sharing memory regions between processes.
- Integration with safemap and complete rework of DS, supporting new data types
  natively (labels, memory ranges, memory mapped ranges).
- For further information:
  http://wiki.minix3.org/en/SummerOfCode2009/MemoryGrants

Additional changes not included in the original Wu's branch:
- Fixed unhandled case in VM when using COW optimization for safecopy in case
  of a block that has already been shared as SMAP.
- Better interface and naming scheme for sys_saferevmap and ds_retrieve_map
  calls.
- Better input checking in syslib: check for page alignment when creating
  memory mapping grants.
- DS notifies subscribers when an entry is deleted.
- Documented the behavior of indirect grants in case of memory mapping.
- Test suite in /usr/src/test/safeperf|safecopy|safemap|ds/* reworked
  and extended.
- Minor fixes and general cleanup.
- TO-DO: Grant ids should be generated and managed the way endpoints are to make
sure grant slots are never misreused.
2010-01-14 15:24:16 +00:00

84 lines
2.1 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 */
#define PBSH_COW 1
#define PBSH_SMAP 2
u8_t share_flag; /* PBSH_COW or PBSH_SMAP */
/* 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 */
#if SANITYCHECKS
int written; /* written to pagetable */
#endif
/* 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