A tool for deriving PKG packet encryption keys for ps4 written in c++
| 1 | // SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project |
| 2 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 3 | |
| 4 | #include "common/spin_lock.h" |
| 5 | |
| 6 | #if _MSC_VER |
| 7 | #include <intrin.h> |
| 8 | #if _M_AMD64 |
| 9 | #define __x86_64__ 1 |
| 10 | #endif |
| 11 | #if _M_ARM64 |
| 12 | #define __aarch64__ 1 |
| 13 | #endif |
| 14 | #else |
| 15 | #if __x86_64__ |
| 16 | #include <xmmintrin.h> |
| 17 | #endif |
| 18 | #endif |
| 19 | |
| 20 | namespace { |
| 21 | |
| 22 | void ThreadPause() { |
| 23 | #if __x86_64__ |
| 24 | _mm_pause(); |
| 25 | #elif __aarch64__ && _MSC_VER |
| 26 | __yield(); |
| 27 | #elif __aarch64__ |
| 28 | asm("yield"); |
| 29 | #endif |
| 30 | } |
| 31 | |
| 32 | } // Anonymous namespace |
| 33 | |
| 34 | namespace Common { |
| 35 | |
| 36 | void SpinLock::lock() { |
| 37 | while (lck.test_and_set(std::memory_order_acquire)) { |
| 38 | ThreadPause(); |
| 39 | } |
| 40 | } |
| 41 | |
| 42 | void SpinLock::unlock() { |
| 43 | lck.clear(std::memory_order_release); |
| 44 | } |
| 45 | |
| 46 | bool SpinLock::try_lock() { |
| 47 | if (lck.test_and_set(std::memory_order_acquire)) { |
| 48 | return false; |
| 49 | } |
| 50 | return true; |
| 51 | } |
| 52 | |
| 53 | } // namespace Common |
| 54 |