| // Copyright 2020 The Fuchsia Authors |
| // |
| // Use of this source code is governed by a MIT-style |
| // license that can be found in the LICENSE file or at |
| // https://opensource.org/licenses/MIT |
| |
| #ifndef ZIRCON_KERNEL_LIB_ARCH_HOST_INCLUDE_LIB_ARCH_INTRIN_H_ |
| #define ZIRCON_KERNEL_LIB_ARCH_HOST_INCLUDE_LIB_ARCH_INTRIN_H_ |
| |
| #ifdef __cplusplus |
| |
| // Provide the machine-independent <lib/arch/intrin.h> API. This file defines |
| // dummy versions that are sufficient to compile code using the generic API |
| // in host contexts, e.g. for unit tests and generator programs. |
| |
| namespace arch { |
| |
| /// Yield the processor momentarily. This should be used in busy waits. |
| inline void Yield() {} |
| |
| /// Synchronize all memory accesses of all kinds. |
| inline void DeviceMemoryBarrier() {} |
| |
| /// Synchronize the ordering of all memory accesses wrt other CPUs. |
| inline void ThreadMemoryBarrier() {} |
| |
| /// Return the current CPU cycle count. |
| inline uint64_t Cycles() { return 0; } |
| |
| } // namespace arch |
| |
| #endif // __cplusplus |
| |
| #endif // ZIRCON_KERNEL_LIB_ARCH_HOST_INCLUDE_LIB_ARCH_INTRIN_H_ |
