7421728360
Memory types in VM are described by methods. Each mapped region has a type, and all pages instantiated get that type on creation. Individual page types has to be able to change though. This commit changes the code to use the memory types of the individual pages, where appropriate, instead of just the higher-level region, in case it has changed. This is needed to e.g. support future copy-on-write MAP_PRIVATE mmap modes. Change-Id: I5523db14ac036ec774a54392fb67f9acb8725731
76 lines
1.8 KiB
C
76 lines
1.8 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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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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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;
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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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