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https://github.com/Atmosphere-NX/Atmosphere.git
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90 lines
3 KiB
C++
90 lines
3 KiB
C++
/*
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* Copyright (c) 2018-2020 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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#if defined(ATMOSPHERE_IS_STRATOSPHERE)
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#include <stratosphere.hpp>
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#elif defined(ATMOSPHERE_IS_MESOSPHERE)
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#include <mesosphere.hpp>
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#elif defined(ATMOSPHERE_IS_EXOSPHERE)
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#include <exosphere.hpp>
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#else
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#include <vapours.hpp>
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#endif
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#include "sdmmc_timer.hpp"
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namespace ams::sdmmc::impl {
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namespace {
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#if defined(AMS_SDMMC_USE_OS_TIMER)
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void SpinWaitMicroSeconds(u32 us) {
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const os::Tick timeout_tick = os::GetSystemTick() + os::ConvertToTick(TimeSpan::FromMicroSeconds(us)) + os::Tick(1);
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while (true) {
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if (os::GetSystemTick() > timeout_tick) {
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break;
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}
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}
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}
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ALWAYS_INLINE void DataSynchronizationBarrier() {
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#if defined(ATMOSPHERE_ARCH_ARM64)
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__asm__ __volatile__("dsb sy" ::: "memory");
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#elif defined(ATMOSPHERE_ARCH_ARM)
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__asm__ __volatile__("dsb" ::: "memory");
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#else
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#error "Unknown architecture for DataSynchronizationBarrier"
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#endif
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}
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ALWAYS_INLINE void InstructionSynchronizationBarrier() {
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#if defined(ATMOSPHERE_ARCH_ARM64) || defined(ATMOSPHERE_ARCH_ARM)
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__asm__ __volatile__("isb" ::: "memory");
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#else
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#error "Unknown architecture for InstructionSynchronizationBarrier"
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#endif
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}
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#endif
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}
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void WaitMicroSeconds(u32 us) {
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#if defined(AMS_SDMMC_USE_OS_TIMER)
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/* Ensure that nothing is reordered before we wait. */
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DataSynchronizationBarrier();
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InstructionSynchronizationBarrier();
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/* If the time is small, spinloop, otherwise pend ourselves. */
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if (us < 100) {
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SpinWaitMicroSeconds(us);
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} else {
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os::SleepThread(TimeSpan::FromMicroSeconds(us));
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}
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/* Ensure that nothing is reordered after we wait. */
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DataSynchronizationBarrier();
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InstructionSynchronizationBarrier();
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#elif defined(AMS_SDMMC_USE_UTIL_TIMER)
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util::WaitMicroSeconds(us);
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#else
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#error "Unknown context for ams::sdmmc::impl::WaitMicroSeconds"
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#endif
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}
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void WaitClocks(u32 num_clocks, u32 clock_frequency_khz) {
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AMS_ABORT_UNLESS(clock_frequency_khz > 0);
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WaitMicroSeconds(util::DivideUp(1000 * num_clocks, clock_frequency_khz));
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}
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}
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