820c94e5dd
The xtensa atomics layer was written with hand-coded assembly that had to be called as functions. That's needlessly slow, given that the low level primitives are a two-instruction sequence. Ideally the compiler should see this as an inline to permit it to better optimize around the needed barriers. There was also a bug with the atomic_cas function, which had a loop internally instead of returning the old value synchronously on a failed swap. That's benign right now because our existing spin lock does nothing but retry it in a tight loop anyway, but it's incorrect per spec and would have caused a contention hang with more elaborate algorithms (for example a spinlock with backoff semantics). Remove the old implementation and replace with a much smaller inline C one based on just two assembly primitives. This patch also contains a little bit of refactoring to address the scheme has been split out into a separate header for each, and the ATOMIC_OPERATIONS_CUSTOM kconfig has been renamed to ATOMIC_OPERATIONS_ARCH to better capture what it means. Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
25 lines
636 B
CMake
25 lines
636 B
CMake
# SPDX-License-Identifier: Apache-2.0
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zephyr_cc_option(-mlongcalls)
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zephyr_library()
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zephyr_library_sources(
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cpu_idle.c
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fatal.c
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window_vectors.S
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xtensa-asm2-util.S
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xtensa-asm2.c
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irq_manage.c
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)
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zephyr_library_sources_ifdef(CONFIG_XTENSA_USE_CORE_CRT1 crt1.S)
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zephyr_library_sources_ifdef(CONFIG_IRQ_OFFLOAD irq_offload.c)
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zephyr_library_sources_ifdef(CONFIG_THREAD_LOCAL_STORAGE tls.c)
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zephyr_library_sources_ifdef(CONFIG_XTENSA_ENABLE_BACKTRACE xtensa_backtrace.c)
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zephyr_library_sources_ifdef(CONFIG_XTENSA_ENABLE_BACKTRACE debug_helpers_asm.S)
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zephyr_library_include_directories(include)
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add_subdirectory(startup)
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