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target/xtensa: implement exclusive access option

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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>
This commit is contained in:
Max Filippov 2019-04-18 16:37:00 -07:00
parent 98736654f3
commit b345e14053
7 changed files with 200 additions and 2 deletions
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8
target/xtensa/overlay_tool.h
View file

@ -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) | \