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| author | Max Filippov <jcmvbkbc@gmail.com> | 2019-04-18 16:37:00 -0700 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2019-05-15 10:31:52 -0700 |
| commit | b345e140534ea17814b02bdf8798f18db6295304 (patch) | |
| tree | f9320a22da357d31ad10e17a340300b02a389b98 /target/xtensa/overlay_tool.h | |
| parent | 98736654f3dfbf984d9e26c9be0480b0560c1067 (diff) | |
| download | qemu-b345e140534ea17814b02bdf8798f18db6295304.zip qemu-b345e140534ea17814b02bdf8798f18db6295304.tar.gz qemu-b345e140534ea17814b02bdf8798f18db6295304.tar.bz2 | |
target/xtensa: implement exclusive access option
The Exclusive Instructions provide a general-purpose mechanism for
atomic updates of memory-based synchronization variables that can be
used for exclusion algorithms.
Use cmpxchg-based implementation that is sufficient for the typical use
of exclusive access in atomic operations.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'target/xtensa/overlay_tool.h')
| -rw-r--r-- | target/xtensa/overlay_tool.h | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/target/xtensa/overlay_tool.h b/target/xtensa/overlay_tool.h index 4925b21..f0cc33a 100644 --- a/target/xtensa/overlay_tool.h +++ b/target/xtensa/overlay_tool.h @@ -76,6 +76,10 @@ #define XCHAL_HAVE_MPU 0 #endif +#ifndef XCHAL_HAVE_EXCLUSIVE +#define XCHAL_HAVE_EXCLUSIVE 0 +#endif + #define XCHAL_OPTION(xchal, qemu) ((xchal) ? XTENSA_OPTION_BIT(qemu) : 0) #define XTENSA_OPTIONS ( \ @@ -96,8 +100,8 @@ XCHAL_OPTION(XCHAL_HAVE_FP, XTENSA_OPTION_FP_COPROCESSOR) | \ XCHAL_OPTION(XCHAL_HAVE_RELEASE_SYNC, XTENSA_OPTION_MP_SYNCHRO) | \ XCHAL_OPTION(XCHAL_HAVE_S32C1I, XTENSA_OPTION_CONDITIONAL_STORE) | \ - XCHAL_OPTION(XCHAL_HAVE_S32C1I && XCHAL_HW_MIN_VERSION >= 230000, \ - XTENSA_OPTION_ATOMCTL) | \ + XCHAL_OPTION(((XCHAL_HAVE_S32C1I && XCHAL_HW_MIN_VERSION >= 230000) || \ + XCHAL_HAVE_EXCLUSIVE), XTENSA_OPTION_ATOMCTL) | \ XCHAL_OPTION(XCHAL_HAVE_DEPBITS, XTENSA_OPTION_DEPBITS) | \ /* Interrupts and exceptions */ \ XCHAL_OPTION(XCHAL_HAVE_EXCEPTIONS, XTENSA_OPTION_EXCEPTION) | \ |