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VM: make mapping types explicit

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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.
This commit is contained in:
Ben Gras
2012-10-11 15:15:49 +02:00
parent fd4ddef49a
commit d343041caa
24 changed files with 888 additions and 863 deletions
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include/sys/mman.h
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@@ -55,7 +55,6 @@ typedef __off_t off_t; /* file offset */
#define MAP_ALIGN64K 0x0040 /* physically aligned at 64kB */
#define MAP_LOWER1M 0x0080 /* physically below 16MB */
#define MAP_ALIGNMENT_64KB MAP_ALIGN64K
#define MAP_IPC_SHARED 0x0100 /* share changes */
#define MAP_FIXED 0x0200 /* require mapping to happen at hint */
#define MAP_THIRDPARTY 0x0400 /* perform on behalf of any process */