5b9c13b23f
Implements a raw clock by directly accessing the `CNTVCT_EL0` and `CNTFRQ_EL0` registers by using `mrs` intrinsics. Should allow for a raw-clock to work on all ARM platforms without having to make a per-platform implementation for any further a64 platforms like MacOS or Linux or Android and such.
38 lines
1.3 KiB
C++
38 lines
1.3 KiB
C++
/**
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******************************************************************************
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* Xenia : Xbox 360 Emulator Research Project *
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******************************************************************************
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* Copyright 2026 Ben Vanik. All rights reserved. *
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* Released under the BSD license - see LICENSE in the root for more details. *
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******************************************************************************
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*/
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#include "xenia/base/clock.h"
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#include "xenia/base/platform.h"
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#if XE_ARCH_ARM64 && XE_CLOCK_RAW_AVAILABLE
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// Wrap all these different cpu compiler intrinsics.
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// So no inline assembler here and the compiler will remove the clutter.
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#if XE_COMPILER_MSVC
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#include <intrin.h>
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constexpr uint32_t CNTFRQ_EL0 = ARM64_SYSREG(3, 3, 14, 0, 0);
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constexpr uint32_t CNTVCT_EL0 = ARM64_SYSREG(3, 3, 14, 0, 2);
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#define xe_cpu_mrs(reg) _ReadStatusReg(reg)
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#elif XE_COMPILER_CLANG || XE_COMPILER_GNUC
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#include <arm_acle.h>
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#define xe_cpu_mrs(reg) __arm_rsr64(#reg)
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#else
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#error "No cpu instruction wrappers for current compiler implemented."
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#endif
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namespace xe {
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XE_NOINLINE
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uint64_t Clock::host_tick_frequency_raw() { return xe_cpu_mrs(CNTFRQ_EL0); }
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XE_NOINLINE
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uint64_t Clock::host_tick_count_raw() { return xe_cpu_mrs(CNTVCT_EL0); }
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} // namespace xe
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#endif
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