d343041caa
Introduce explicit abstractions for different mapping types, handling the instantiation, forking, pagefaults and freeing of anonymous memory, direct physical mappings, shared memory and physically contiguous anonymous memory as separate types, making region.c more generic. Also some other genericification like merging the 3 munmap cases into one. COW and SMAP safemap code is still implicit in region.c.
83 lines
1.9 KiB
C
83 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 "physravl.h"
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#include "memtype.h"
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#include "vm.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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u8_t refcount; /* Refcount of these pages */
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#define PBSH_COW 1
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#define PBSH_SMAP 2
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u8_t share_flag; /* PBSH_COW or PBSH_SMAP */
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/* what kind of memory is it? */
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mem_type_t *memtype;
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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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};
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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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physr_avl *phys; /* avl tree of physical memory blocks */
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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 *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;
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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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} 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_CONTIG 0x020 /* Must be physically contiguous. */
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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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