c5b309ff07
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.
84 lines
2.1 KiB
C
84 lines
2.1 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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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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vir_bytes length; /* no. of contiguous bytes */
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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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/* 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 phys_region {
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struct phys_block *ph;
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struct vir_region *parent; /* parent vir_region. */
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vir_bytes offset; /* offset from start of vir region */
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#if SANITYCHECKS
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int written; /* written to pagetable */
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#endif
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/* list of phys_regions that reference the same phys_block */
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struct phys_region *next_ph_list;
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/* AVL fields */
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struct phys_region *less, *greater;
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int factor;
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} phys_region_t;
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#include "physravl.h"
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struct vir_region {
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struct vir_region *next; /* next virtual region in this process */
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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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u32_t tag; /* Opaque to mapping code. */
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struct vmproc *parent; /* Process that owns this vir_region. */
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};
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/* Mapping flags: */
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#define VR_WRITABLE 0x001 /* Process may write here. */
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#define VR_NOPF 0x002 /* May not generate page faults. */
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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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/* 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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#define VR_SHARED 0x40
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/* Tag values: */
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#define VRT_NONE 0xBEEF0000
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#define VRT_HEAP 0xBEEF0001
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#define VRT_CODE 0xBEEF0002
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/* map_page_region flags */
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#define MF_PREALLOC 0x01
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#define MF_CONTIG 0x02
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#endif
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