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ca0ec73c |
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25-Mar-2020 |
Conrad Meyer <cem@FreeBSD.org> |
Expand generic subword atomic primitives The goal of this change is to make the atomic_load_acq_{8,16}, atomic_testandset{,_acq}_long, and atomic_testandclear_long primitives available in MI-namespace. The second goal is to get this draft out of my local tree, as anything that requires a full tinderbox is a big burden out of tree. MD specifics can be refined individually afterwards. The generic implementations may not be ideal for your architecture; feel free to implement better versions. If no subword_atomic definitions are needed, the include can be removed from your arch's machine/atomic.h. Generic definitions are guarded by defined macros of the same name. To avoid picking up conflicting generic definitions, some macro defines are added to various MD machine/atomic.h to register an existing implementation. Include _atomic_subword.h in arm and arm64 machine/atomic.h. For some odd reason, KCSAN only generates some versions of primitives. Generate the _acq variants of atomic_load.*_8, atomic_load.*_16, and atomic_testandset.*_long. There are other questionably disabled primitives, but I didn't run into them, so I left them alone. KCSAN is only built for amd64 in tinderbox for now. Add atomic_subword implementations of atomic_load_acq_{8,16} implemented using masking and atomic_load_acq_32. Add generic atomic_subword implementations of atomic_testandset_long(), atomic_testandclear_long(), and atomic_testandset_acq_long(), using atomic_fcmpset_long() and atomic_fcmpset_acq_long(). On x86, add atomic_testandset_acq_long as an alias for atomic_testandset_long. Reviewed by: kevans, rlibby (previous versions both) Differential Revision: https://reviews.freebsd.org/D22963
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d0bdb111 |
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14-Nov-2019 |
Justin Hibbits <jhibbits@FreeBSD.org> |
atomic: Add atomic_cmpset_masked to powerpc and use it Summary: This is a more optimal way of doing atomic_compset_masked() than the fallback in sys/_atomic_subword.h. There's also an override for _atomic_fcmpset_masked_word(), which may or may not be necessary, and is unused for powerpc. Reviewed by: kevans, kib Differential Revision: https://reviews.freebsd.org/D22359
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b6c5d1ef |
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02-Oct-2019 |
Kyle Evans <kevans@FreeBSD.org> |
Provide generic sub-word atomic *cmpset Provide *cmpset_{8,16} as wrappers around atomic_fcmpset_32. Initial users will be mips and sparc64, and perhaps parts of powerpc. This are not for general consumption; machine/atomic.h should include this header as needed to provide atomic_{,f}cmpset_{8,16} and machine/atomic.h should provide acq_ and rel_ variants. Reviewed by: jhibbits, kib Differential Revision: https://reviews.freebsd.org/D21822
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