mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2024-09-20 07:49:26 -04:00
93 lines
5 KiB
C++
93 lines
5 KiB
C++
/*
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* Copyright (c) Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <vapours/svc/svc_common.hpp>
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#include <vapours/svc/svc_select_hardware_constants.hpp>
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namespace ams::svc {
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class Tick {
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public:
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static constexpr s64 TicksPerSecond = ::ams::svc::TicksPerSecond;
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static consteval s64 GetTicksPerSecond() { return TicksPerSecond; }
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private:
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s64 m_tick;
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private:
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static constexpr s64 NanoSecondsPerSecond = TimeSpan::FromSeconds(1).GetNanoSeconds();
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static constexpr ALWAYS_INLINE s64 ConvertTimeSpanToTickImpl(TimeSpan ts) {
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/* Get nano-seconds. */
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const s64 ns = ts.GetNanoSeconds();
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/* Special-case optimize arm64/nintendo-nx value. */
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if (!std::is_constant_evaluated()) {
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if constexpr (TicksPerSecond == 19'200'000) {
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#if defined(ATMOSPHERE_IS_MESOSPHERE) && defined(ATMOSPHERE_ARCH_ARM64)
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s64 t0, t1, t2, t3;
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__asm__ __volatile__("mov %[t1], #0x5A53\n"
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"movk %[t1], #0xA09B, lsl #16\n"
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"lsr %[t0], %[ns], #9\n"
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"movk %[t1], #0xB82F, lsl #32\n"
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"movk %[t1], #0x0044, lsl #48\n"
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"umulh %[t0], %[t0], %[t1]\n"
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"mov %[t1], #0xFFFFFFFFFFFF3600\n"
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"movk %[t1], #0xC465, lsl #16\n"
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"lsr %[t0], %[t0], #0xB\n"
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"madd %[t1], %[t0], %[t1], %[ns]\n"
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"mov %w[t2], #0xF800\n"
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"movk %w[t2], #0x0124, lsl #16\n"
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"mov %w[t3], #0xCA00\n"
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"movk %w[t3], #0x3B9A, lsl #16\n"
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"madd %[t1], %[t1], %[t2], %[t3]\n"
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"mov %[t3], #0x94B3\n"
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"movk %[t3], #0x26D6, lsl #16\n"
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"movk %[t3], #0x0BE8, lsl #32\n"
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"movk %[t3], #0x112E, lsl #48\n"
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"sub %[t1], %[t1], #1\n"
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"smulh %[t1], %[t1], %[t3]\n"
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"asr %[t3], %[t1], #26\n"
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"add %[t1], %[t3], %[t1], lsr #63\n"
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"madd %[t0], %[t0], %[t2], %[t1]\n"
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: [t0]"=&r"(t0), [t1]"=&r"(t1), [t2]"=&r"(t2), [t3]"=&r"(t3)
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: [ns]"r"(ns)
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: "cc");
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return t0;
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#endif
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}
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}
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return util::ScaleByConstantFactor<s64, TicksPerSecond, NanoSecondsPerSecond>(ns);
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}
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public:
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constexpr ALWAYS_INLINE explicit Tick(s64 t = 0) : m_tick(t) { /* ... */ }
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constexpr ALWAYS_INLINE Tick(TimeSpan ts) : m_tick(ConvertTimeSpanToTickImpl(ts)) { /* ... */ }
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constexpr ALWAYS_INLINE operator s64() const { return m_tick; }
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/* Tick arithmetic. */
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constexpr ALWAYS_INLINE Tick &operator+=(Tick rhs) { m_tick += rhs.m_tick; return *this; }
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constexpr ALWAYS_INLINE Tick &operator-=(Tick rhs) { m_tick -= rhs.m_tick; return *this; }
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constexpr ALWAYS_INLINE Tick operator+(Tick rhs) const { Tick r(*this); return r += rhs; }
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constexpr ALWAYS_INLINE Tick operator-(Tick rhs) const { Tick r(*this); return r -= rhs; }
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constexpr ALWAYS_INLINE Tick &operator+=(TimeSpan rhs) { m_tick += Tick(rhs).m_tick; return *this; }
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constexpr ALWAYS_INLINE Tick &operator-=(TimeSpan rhs) { m_tick -= Tick(rhs).m_tick; return *this; }
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constexpr ALWAYS_INLINE Tick operator+(TimeSpan rhs) const { Tick r(*this); return r += rhs; }
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constexpr ALWAYS_INLINE Tick operator-(TimeSpan rhs) const { Tick r(*this); return r -= rhs; }
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};
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}
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