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.
- The primary reason is that mkfs and installboot need to run natively during
the cross compilation (host and target versions are compiled). There is a
collision of include files though. E.g. a.out.h is very minix-specific.
Therefore some files we moved and replaced by stubs that include the original
file if compiling on or for Minix :
include/a.out.h -> include/minix/a.out.h
include/sys/dir.h -> include/minix/dir.h
include/dirent.h -> include/minix/dirent.h
include/sys/types.h -> include/minix/types.h
- This does not break any native compilation on Minix. Other headers that were
including the original files are changed according to include directly the
new, minix specific location not to pick up the host system includes while
cross-compiling.
- role of this patch is to make rebasing of the build branch simpler until the
new build system is merged
