49b9165251
. test74 for mmap functionality . vm: add a mem_file memory type that specifies an mmap()ped memory range, backed by a file . add fdref, an object that keeps track of FD references within VM per process and so knows how to de-duplicate the use of FD's by various mmap()ped ranges; there can be many more than there can be FD's . turned off for now, enable with 'filemap=1' as boot option Change-Id: I640b1126cdaa522a0560301cf6732b7661555672
86 lines
1.9 KiB
C
86 lines
1.9 KiB
C
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#ifndef _REGION_H
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#define _REGION_H 1
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#include <minix/callnr.h>
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#include <minix/com.h>
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#include <minix/config.h>
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#include <minix/const.h>
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#include <minix/ds.h>
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#include <minix/endpoint.h>
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#include <minix/keymap.h>
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#include <minix/minlib.h>
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#include <minix/type.h>
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#include <minix/ipc.h>
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#include <minix/sysutil.h>
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#include <minix/syslib.h>
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#include <minix/const.h>
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#include "phys_region.h"
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#include "memtype.h"
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#include "vm.h"
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#include "fdref.h"
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struct phys_block {
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#if SANITYCHECKS
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u32_t seencount;
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#endif
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phys_bytes phys; /* physical memory */
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/* first in list of phys_regions that reference this block */
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struct phys_region *firstregion;
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u8_t refcount; /* Refcount of these pages */
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u8_t flags;
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};
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#define PBF_INCACHE 0x01
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typedef struct vir_region {
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vir_bytes vaddr; /* virtual address, offset from pagetable */
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vir_bytes length; /* length in bytes */
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struct phys_region **physblocks;
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u16_t flags;
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struct vmproc *parent; /* Process that owns this vir_region. */
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mem_type_t *def_memtype; /* Default instantiated memory type. */
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int remaps;
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u32_t id; /* unique id */
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union {
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phys_bytes phys; /* VR_DIRECT */
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struct {
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endpoint_t ep;
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vir_bytes vaddr;
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int id;
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} shared;
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struct phys_block *pb_cache;
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struct {
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int inited;
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struct fdref *fdref;
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u64_t offset;
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u16_t clearend;
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} file;
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} param;
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/* AVL fields */
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struct vir_region *lower, *higher;
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int factor;
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} region_t;
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/* Mapping flags: */
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#define VR_WRITABLE 0x001 /* Process may write here. */
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#define VR_PHYS64K 0x004 /* Physical memory must be 64k aligned. */
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#define VR_LOWER16MB 0x008
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#define VR_LOWER1MB 0x010
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#define VR_SHARED 0x040
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#define VR_UNINITIALIZED 0x080 /* Do not clear after allocation */
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/* Mapping type: */
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#define VR_ANON 0x100 /* Memory to be cleared and allocated */
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#define VR_DIRECT 0x200 /* Mapped, but not managed by VM */
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/* map_page_region flags */
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#define MF_PREALLOC 0x01
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#endif
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