Merge pull request #277 from shadps4-emu/kernel/hr_timers

HR Timers support and event queue refactoring

.gitmodules

@@ -31,9 +31,6 @@
 [submodule "externals/robin-map"]
 	path = externals/robin-map
 	url = https://github.com/Tessil/robin-map.git
-[submodule "externals/boost"]
-	path = externals/boost
-	url = https://github.com/raphaelthegreat/ext-boost.git
 [submodule "externals/xbyak"]
 	path = externals/xbyak
 	url = https://github.com/herumi/xbyak.git
@@ -58,3 +55,6 @@
 [submodule "externals/tracy"]
 	path = externals/tracy
 	url = https://github.com/shadps4-emu/tracy.git
+[submodule "externals/ext-boost"]
+	path = externals/ext-boost
+	url = https://github.com/shadps4-emu/ext-boost.git

CMakeLists.txt

@@ -576,6 +576,8 @@ if (WIN32)
     target_sources(shadps4 PRIVATE src/shadps4.rc)
 endif()
 
+add_definitions(-DBOOST_ASIO_STANDALONE)
+
 target_include_directories(shadps4 PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
 
 # Shaders sources

externals/CMakeLists.txt

@@ -12,8 +12,8 @@ endif()
 
 # Boost
 if (NOT TARGET Boost::headers)
-    set(BOOST_ROOT "${CMAKE_SOURCE_DIR}/externals/boost" CACHE STRING "")
+    set(BOOST_ROOT "${CMAKE_SOURCE_DIR}/externals/ext-boost" CACHE STRING "")
-    set(Boost_INCLUDE_DIR "${CMAKE_SOURCE_DIR}/externals/boost" CACHE STRING "")
+    set(Boost_INCLUDE_DIR "${CMAKE_SOURCE_DIR}/externals/ext-boost" CACHE STRING "")
     set(Boost_NO_SYSTEM_PATHS ON CACHE BOOL "")
     add_library(boost INTERFACE)
     target_include_directories(boost SYSTEM INTERFACE ${Boost_INCLUDE_DIR})

externals/boost

@@ -1 +0,0 @@
-Subproject commit 87b7817119982e8ad6068855fae31b11590514be

externals/ext-boost

@@ -0,0 +1 @@
+Subproject commit 147b2de7734f5dc3b9aeb1f4135ae15fcd44b9d7

src/common/debug.h

@@ -41,6 +41,8 @@ enum MarkersPallete : int {
 #define RENDERER_TRACE ZoneScopedC(RendererMarkerColor)
 #define HLE_TRACE ZoneScopedC(HleMarkerColor)
 
+#define TRACE_HINT(str) ZoneText(str.c_str(), str.size())
+
 #define TRACE_WARN(msg)                                                                            \
     [](const auto& msg) { TracyMessageC(msg.c_str(), msg.size(), tracy::Color::DarkOrange); }(msg);
 #define TRACE_ERROR(msg)                                                                           \

src/common/logging/backend.cpp

@@ -170,7 +170,7 @@ public:
                    const char* function, std::string message) {
         // Propagate important log messages to the profiler
         if (IsProfilerConnected()) {
-            const auto& msg_str = std::format("[{}] {}", GetLogClassName(log_class), message);
+            const auto& msg_str = fmt::format("[{}] {}", GetLogClassName(log_class), message);
             switch (log_level) {
             case Level::Warning:
                 TRACE_WARN(msg_str);

src/core/libraries/gnmdriver/gnmdriver.cpp

@@ -26,6 +26,17 @@ using namespace AmdGpu;
 
 static std::unique_ptr<AmdGpu::Liverpool> liverpool;
 
+enum GnmEventIdents : u64 {
+    Compute0RelMem = 0x00,
+    Compute1RelMem = 0x01,
+    Compute2RelMem = 0x02,
+    Compute3RelMem = 0x03,
+    Compute4RelMem = 0x04,
+    Compute5RelMem = 0x05,
+    Compute6RelMem = 0x06,
+    GfxEop = 0x40
+};
+
 enum ShaderStages : u32 {
     Cs,
     Ps,
@@ -327,10 +338,6 @@ static inline u32* ClearContextState(u32* cmdbuf) {
 
 s32 PS4_SYSV_ABI sceGnmAddEqEvent(SceKernelEqueue eq, u64 id, void* udata) {
     LOG_TRACE(Lib_GnmDriver, "called");
-    if (id != SceKernelEvent::Type::GfxEop) {
-        return ORBIS_OK;
-    }
-    ASSERT_MSG(id == SceKernelEvent::Type::GfxEop);
 
     if (!eq) {
         return ORBIS_KERNEL_ERROR_EBADF;
@@ -338,20 +345,20 @@ s32 PS4_SYSV_ABI sceGnmAddEqEvent(SceKernelEqueue eq, u64 id, void* udata) {
 
     EqueueEvent kernel_event{};
     kernel_event.event.ident = id;
-    kernel_event.event.filter = EVFILT_GRAPHICS_CORE;
+    kernel_event.event.filter = SceKernelEvent::Filter::GraphicsCore;
-    kernel_event.event.flags = 1;
+    kernel_event.event.flags = SceKernelEvent::Flags::Add;
     kernel_event.event.fflags = 0;
     kernel_event.event.data = id;
     kernel_event.event.udata = udata;
-    eq->addEvent(kernel_event);
+    eq->AddEvent(kernel_event);
 
     Platform::IrqC::Instance()->Register(
         Platform::InterruptId::GfxEop,
         [=](Platform::InterruptId irq) {
             ASSERT_MSG(irq == Platform::InterruptId::GfxEop,
-                       "An unexpected IRQ occured"); // We need to conver IRQ# to event id and do
+                       "An unexpected IRQ occured"); // We need to convert IRQ# to event id and do
                                                      // proper filtering in trigger function
-            eq->triggerEvent(SceKernelEvent::Type::GfxEop, EVFILT_GRAPHICS_CORE, nullptr);
+            eq->TriggerEvent(GnmEventIdents::GfxEop, SceKernelEvent::Filter::GraphicsCore, nullptr);
         },
         eq);
     return ORBIS_OK;
@@ -455,13 +462,13 @@ int PS4_SYSV_ABI sceGnmDebugHardwareStatus() {
 
 s32 PS4_SYSV_ABI sceGnmDeleteEqEvent(SceKernelEqueue eq, u64 id) {
     LOG_TRACE(Lib_GnmDriver, "called");
-    ASSERT_MSG(id == SceKernelEvent::Type::GfxEop);
+    ASSERT_MSG(id == GnmEventIdents::GfxEop);
 
     if (!eq) {
         return ORBIS_KERNEL_ERROR_EBADF;
     }
 
-    eq->removeEvent(id);
+    eq->RemoveEvent(id);
 
     Platform::IrqC::Instance()->Unregister(Platform::InterruptId::GfxEop, eq);
     return ORBIS_OK;

src/core/libraries/kernel/event_queue.cpp

@@ -8,69 +8,143 @@ namespace Libraries::Kernel {
 
 EqueueInternal::~EqueueInternal() = default;
 
-int EqueueInternal::addEvent(const EqueueEvent& event) {
+bool EqueueInternal::AddEvent(EqueueEvent& event) {
     std::scoped_lock lock{m_mutex};
 
-    ASSERT(!event.isTriggered);
+    event.time_added = std::chrono::steady_clock::now();
 
-    // TODO check if event is already exists and return it. Currently we just add in m_events array
+    const auto& it = std::ranges::find(m_events, event);
-    m_events.push_back(event);
+    if (it != m_events.cend()) {
-    return 0;
+        *it = std::move(event);
-}
-
-int EqueueInternal::removeEvent(u64 id) {
-    std::scoped_lock lock{m_mutex};
-
-    const auto& event_q =
-        std::ranges::find_if(m_events, [id](auto& ev) { return ev.event.ident == id; });
-    ASSERT(event_q != m_events.cend());
-    m_events.erase(event_q);
-    return 0;
-}
-
-int EqueueInternal::waitForEvents(SceKernelEvent* ev, int num, u32 micros) {
-    std::unique_lock lock{m_mutex};
-    int ret = 0;
-
-    const auto predicate = [&] {
-        ret = getTriggeredEvents(ev, num);
-        return ret > 0;
-    };
-
-    if (micros == 0) {
-        m_cond.wait(lock, predicate);
     } else {
-        m_cond.wait_for(lock, std::chrono::microseconds(micros), predicate);
+        m_events.emplace_back(std::move(event));
     }
-    return ret;
-}
-
-bool EqueueInternal::triggerEvent(u64 ident, s16 filter, void* trigger_data) {
-    {
-        std::scoped_lock lock{m_mutex};
-
-        for (auto& event : m_events) {
-            if (event.event.ident == ident) { // event filter?
-                event.trigger(trigger_data);
-            }
-        }
-    }
-    m_cond.notify_one();
 
     return true;
 }
 
-int EqueueInternal::getTriggeredEvents(SceKernelEvent* ev, int num) {
+bool EqueueInternal::RemoveEvent(u64 id) {
-    int ret = 0;
+    bool has_found = false;
+    std::scoped_lock lock{m_mutex};
+
+    const auto& it =
+        std::ranges::find_if(m_events, [id](auto& ev) { return ev.event.ident == id; });
+    if (it != m_events.cend()) {
+        m_events.erase(it);
+        has_found = true;
+    }
+    return has_found;
+}
+
+int EqueueInternal::WaitForEvents(SceKernelEvent* ev, int num, u32 micros) {
+    int count = 0;
+
+    const auto predicate = [&] {
+        count = GetTriggeredEvents(ev, num);
+        return count > 0;
+    };
+
+    if (micros == 0) {
+        std::unique_lock lock{m_mutex};
+        m_cond.wait(lock, predicate);
+    } else {
+        std::unique_lock lock{m_mutex};
+        m_cond.wait_for(lock, std::chrono::microseconds(micros), predicate);
+    }
+
+    if (HasSmallTimer()) {
+        if (count > 0) {
+            const auto time_waited = std::chrono::duration_cast<std::chrono::microseconds>(
+                                         std::chrono::steady_clock::now() - m_events[0].time_added)
+                                         .count();
+            count = WaitForSmallTimer(ev, num, std::max(0l, long(micros - time_waited)));
+        }
+        small_timer_event.event.data = 0;
+    }
+
+    if (ev->flags & SceKernelEvent::Flags::OneShot) {
+        for (auto ev_id = 0u; ev_id < count; ++ev_id) {
+            RemoveEvent(ev->ident);
+        }
+    }
+
+    return count;
+}
+
+bool EqueueInternal::TriggerEvent(u64 ident, s16 filter, void* trigger_data) {
+    bool has_found = false;
+    {
+        std::scoped_lock lock{m_mutex};
 
         for (auto& event : m_events) {
-        if (event.isTriggered) {
+            ASSERT_MSG(event.event.filter == filter,
-            ev[ret++] = event.event;
+                       "Event to trigger doesn't match to queue events");
-            event.reset();
+            if (event.event.ident == ident) {
+                event.Trigger(trigger_data);
+                has_found = true;
+            }
+        }
+    }
+    m_cond.notify_one();
+    return has_found;
+}
+
+int EqueueInternal::GetTriggeredEvents(SceKernelEvent* ev, int num) {
+    int count = 0;
+
+    for (auto& event : m_events) {
+        if (event.IsTriggered()) {
+            if (ev->flags & SceKernelEvent::Flags::Clear) {
+                event.Reset();
+            }
+
+            ev[count++] = event.event;
+
+            if (count == num) {
+                break;
+            }
         }
     }
 
-    return ret;
+    return count;
+}
+
+bool EqueueInternal::AddSmallTimer(EqueueEvent& ev) {
+    // We assume that only one timer event (with the same ident across calls)
+    // can be posted to the queue, based on observations so far. In the opposite case,
+    // the small timer storage and wait logic should be reworked.
+    ASSERT(!HasSmallTimer() || small_timer_event.event.ident == ev.event.ident);
+    ev.time_added = std::chrono::steady_clock::now();
+    small_timer_event = std::move(ev);
+    return true;
+}
+
+int EqueueInternal::WaitForSmallTimer(SceKernelEvent* ev, int num, u32 micros) {
+    int count{};
+
+    ASSERT(num == 1);
+
+    auto curr_clock = std::chrono::steady_clock::now();
+    const auto wait_end_us = curr_clock + std::chrono::microseconds{micros};
+
+    do {
+        curr_clock = std::chrono::steady_clock::now();
+
+        {
+            std::unique_lock lock{m_mutex};
+            if ((curr_clock - small_timer_event.time_added) >
+                std::chrono::microseconds{small_timer_event.event.data}) {
+                ev[count++] = small_timer_event.event;
+                small_timer_event.event.data = 0;
+                break;
+            }
+        }
+
+        std::this_thread::yield();
+
+    } while (curr_clock < wait_end_us);
+
+    return count;
 }
 
 } // namespace Libraries::Kernel

src/core/libraries/kernel/event_queue.h

@@ -7,87 +7,84 @@
 #include <mutex>
 #include <string>
 #include <vector>
+
+#include <boost/asio/steady_timer.hpp>
+
 #include "common/types.h"
 
 namespace Libraries::Kernel {
 
-constexpr s16 EVFILT_READ = -1;
-constexpr s16 EVFILT_WRITE = -2;
-constexpr s16 EVFILT_AIO = -3;    // attached to aio requests
-constexpr s16 EVFILT_VNODE = -4;  // attached to vnodes
-constexpr s16 EVFILT_PROC = -5;   // attached to struct proc
-constexpr s16 EVFILT_SIGNAL = -6; // attached to struct proc
-constexpr s16 EVFILT_TIMER = -7;  // timers
-constexpr s16 EVFILT_FS = -9;     // filesystem events
-constexpr s16 EVFILT_LIO = -10;   // attached to lio requests
-constexpr s16 EVFILT_USER = -11;  // User events
-constexpr s16 EVFILT_POLLING = -12;
-constexpr s16 EVFILT_VIDEO_OUT = -13;
-constexpr s16 EVFILT_GRAPHICS_CORE = -14;
-constexpr s16 EVFILT_HRTIMER = -15;
-constexpr s16 EVFILT_UVD_TRAP = -16;
-constexpr s16 EVFILT_VCE_TRAP = -17;
-constexpr s16 EVFILT_SDMA_TRAP = -18;
-constexpr s16 EVFILT_REG_EV = -19;
-constexpr s16 EVFILT_GPU_EXCEPTION = -20;
-constexpr s16 EVFILT_GPU_SYSTEM_EXCEPTION = -21;
-constexpr s16 EVFILT_GPU_DBGGC_EV = -22;
-constexpr s16 EVFILT_SYSCOUNT = 22;
-
-constexpr u16 EV_ONESHOT = 0x10;    // only report one occurrence
-constexpr u16 EV_CLEAR = 0x20;      // clear event state after reporting
-constexpr u16 EV_RECEIPT = 0x40;    // force EV_ERROR on success, data=0
-constexpr u16 EV_DISPATCH = 0x80;   // disable event after reporting
-constexpr u16 EV_SYSFLAGS = 0xF000; // reserved by system
-constexpr u16 EV_FLAG1 = 0x2000;    // filter-specific flag
-
 class EqueueInternal;
 struct EqueueEvent;
 
-using TriggerFunc = void (*)(EqueueEvent* event, void* trigger_data);
-using ResetFunc = void (*)(EqueueEvent* event);
-using DeleteFunc = void (*)(EqueueInternal* eq, EqueueEvent* event);
-
 struct SceKernelEvent {
-    enum Type : u64 {
+    enum Filter : s16 {
-        Compute0RelMem = 0x00,
+        None = 0,
-        Compute1RelMem = 0x01,
+        Read = -1,
-        Compute2RelMem = 0x02,
+        Write = -2,
-        Compute3RelMem = 0x03,
+        Aio = -3,
-        Compute4RelMem = 0x04,
+        Vnode = -4,
-        Compute5RelMem = 0x05,
+        Proc = -5,
-        Compute6RelMem = 0x06,
+        Signal = -6,
-        GfxEop = 0x40
+        Timer = -7,
+        Fs = -9,
+        Lio = -10,
+        User = -11,
+        Polling = -12,
+        VideoOut = -13,
+        GraphicsCore = -14,
+        HrTimer = -15,
+    };
+
+    enum Flags : u16 {
+        Add = 1u,
+        Delete = 2u,
+        Enable = 4u,
+        Disable = 8u,
+        OneShot = 0x10u,
+        Clear = 0x20u,
+        Receipt = 0x40u,
+        Dispatch = 0x80u,
+        Flag1 = 0x2000u,
+        System = 0xf000u,
     };
 
     u64 ident = 0;                /* identifier for this event */
-    s16 filter = 0; /* filter for event */
+    Filter filter = Filter::None; /* filter for event */
     u16 flags = 0;
     u32 fflags = 0;
     u64 data = 0;
     void* udata = nullptr; /* opaque user data identifier */
 };
 
-struct Filter {
-    void* data = nullptr;
-};
-
 struct EqueueEvent {
-    bool isTriggered = false;
     SceKernelEvent event;
-    Filter filter;
+    void* data = nullptr;
+    std::chrono::steady_clock::time_point time_added;
+    std::unique_ptr<boost::asio::steady_timer> timer;
 
-    void reset() {
+    void Reset() {
-        isTriggered = false;
+        is_triggered = false;
         event.fflags = 0;
         event.data = 0;
     }
 
-    void trigger(void* data) {
+    void Trigger(void* data) {
-        isTriggered = true;
+        is_triggered = true;
         event.fflags++;
         event.data = reinterpret_cast<uintptr_t>(data);
     }
+
+    bool IsTriggered() const {
+        return is_triggered;
+    }
+
+    bool operator==(const EqueueEvent& ev) const {
+        return ev.event.ident == event.ident;
+    }
+
+private:
+    bool is_triggered = false;
 };
 
 class EqueueInternal {
@@ -97,16 +94,26 @@ public:
     void setName(const std::string& m_name) {
         this->m_name = m_name;
     }
-    int addEvent(const EqueueEvent& event);
+    const auto& GetName() const {
-    int removeEvent(u64 id);
+        return m_name;
-    int waitForEvents(SceKernelEvent* ev, int num, u32 micros);
+    }
-    bool triggerEvent(u64 ident, s16 filter, void* trigger_data);
+    bool AddEvent(EqueueEvent& event);
-    int getTriggeredEvents(SceKernelEvent* ev, int num);
+    bool RemoveEvent(u64 id);
+    int WaitForEvents(SceKernelEvent* ev, int num, u32 micros);
+    bool TriggerEvent(u64 ident, s16 filter, void* trigger_data);
+    int GetTriggeredEvents(SceKernelEvent* ev, int num);
+
+    bool AddSmallTimer(EqueueEvent& event);
+    bool HasSmallTimer() const {
+        return small_timer_event.event.data != 0;
+    }
+    int WaitForSmallTimer(SceKernelEvent* ev, int num, u32 micros);
 
 private:
     std::string m_name;
     std::mutex m_mutex;
     std::vector<EqueueEvent> m_events;
+    EqueueEvent small_timer_event{};
     std::condition_variable m_cond;
 };
 

src/core/libraries/kernel/event_queues.cpp

@@ -2,12 +2,29 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #include "common/assert.h"
+#include "common/debug.h"
 #include "common/logging/log.h"
 #include "core/libraries/error_codes.h"
 #include "core/libraries/kernel/event_queues.h"
 
+#include <boost/asio/placeholders.hpp>
+
 namespace Libraries::Kernel {
 
+extern boost::asio::io_context io_context;
+extern void KernelSignalRequest();
+
+static constexpr auto HrTimerSpinlockThresholdUs = 1200u;
+
+static void SmallTimerCallback(const boost::system::error_code& error, SceKernelEqueue eq,
+                               SceKernelEvent kevent) {
+    static EqueueEvent event;
+    event.event = kevent;
+    event.event.data = HrTimerSpinlockThresholdUs;
+    eq->AddSmallTimer(event);
+    eq->TriggerEvent(kevent.ident, SceKernelEvent::Filter::HrTimer, kevent.udata);
+}
+
 int PS4_SYSV_ABI sceKernelCreateEqueue(SceKernelEqueue* eq, const char* name) {
     if (eq == nullptr) {
         LOG_ERROR(Kernel_Event, "Event queue is null!");
@@ -43,31 +60,39 @@ int PS4_SYSV_ABI sceKernelDeleteEqueue(SceKernelEqueue eq) {
 
 int PS4_SYSV_ABI sceKernelWaitEqueue(SceKernelEqueue eq, SceKernelEvent* ev, int num, int* out,
                                      SceKernelUseconds* timo) {
-    LOG_INFO(Kernel_Event, "num = {}", num);
+    HLE_TRACE;
+    TRACE_HINT(eq->GetName());
+    LOG_TRACE(Kernel_Event, "equeue = {} num = {}", eq->GetName(), num);
 
     if (eq == nullptr) {
         return ORBIS_KERNEL_ERROR_EBADF;
     }
 
     if (ev == nullptr) {
-        return SCE_KERNEL_ERROR_EFAULT;
+        return ORBIS_KERNEL_ERROR_EFAULT;
     }
 
     if (num < 1) {
-        return SCE_KERNEL_ERROR_EINVAL;
+        return ORBIS_KERNEL_ERROR_EINVAL;
     }
 
+    if (eq->HasSmallTimer()) {
+        ASSERT(timo && *timo);
+        *out = eq->WaitForSmallTimer(ev, num, *timo);
+    } else {
         if (timo == nullptr) { // wait until an event arrives without timing out
-        *out = eq->waitForEvents(ev, num, 0);
+            *out = eq->WaitForEvents(ev, num, 0);
         }
 
         if (timo != nullptr) {
-        // Only events that have already arrived at the time of this function call can be received
+            // Only events that have already arrived at the time of this function call can be
+            // received
             if (*timo == 0) {
-            *out = eq->getTriggeredEvents(ev, num);
+                *out = eq->GetTriggeredEvents(ev, num);
             } else {
                 // Wait until an event arrives with timing out
-            *out = eq->waitForEvents(ev, num, *timo);
+                *out = eq->WaitForEvents(ev, num, *timo);
+            }
         }
     }
 
@@ -78,21 +103,65 @@ int PS4_SYSV_ABI sceKernelWaitEqueue(SceKernelEqueue eq, SceKernelEvent* ev, int
     return ORBIS_OK;
 }
 
+s32 PS4_SYSV_ABI sceKernelAddHRTimerEvent(SceKernelEqueue eq, int id, timespec* ts, void* udata) {
+    if (eq == nullptr) {
+        return ORBIS_KERNEL_ERROR_EBADF;
+    }
+
+    if (ts->tv_sec > 100 || ts->tv_nsec < 100'000) {
+        return ORBIS_KERNEL_ERROR_EINVAL;
+    }
+    ASSERT(ts->tv_nsec > 1000); // assume 1us resolution
+    const auto total_us = ts->tv_sec * 1000'000 + ts->tv_nsec / 1000;
+
+    EqueueEvent event{};
+    event.event.ident = id;
+    event.event.filter = SceKernelEvent::Filter::HrTimer;
+    event.event.flags = SceKernelEvent::Flags::Add | SceKernelEvent::Flags::OneShot;
+    event.event.fflags = 0;
+    event.event.data = total_us;
+    event.event.udata = udata;
+
+    // HR timers cannot be implemented within the existing event queue architecture due to the
+    // slowness of the notification mechanism. For instance, a 100us timer will lose its precision
+    // as the trigger time drifts by +50-700%, depending on the host PC and workload. To address
+    // this issue, we use a spinlock for small waits (which can be adjusted using
+    // `HrTimerSpinlockThresholdUs`) and fall back to boost asio timers if the time to tick is
+    // large. Even for large delays, we truncate a small portion to complete the wait
+    // using the spinlock, prioritizing precision.
+    if (total_us < HrTimerSpinlockThresholdUs) {
+        return eq->AddSmallTimer(event) ? ORBIS_OK : ORBIS_KERNEL_ERROR_ENOMEM;
+    }
+
+    event.timer = std::make_unique<boost::asio::steady_timer>(
+        io_context, std::chrono::microseconds(total_us - HrTimerSpinlockThresholdUs));
+
+    event.timer->async_wait(
+        std::bind(SmallTimerCallback, boost::asio::placeholders::error, eq, event.event));
+
+    if (!eq->AddEvent(event)) {
+        return ORBIS_KERNEL_ERROR_ENOMEM;
+    }
+
+    KernelSignalRequest();
+
+    return ORBIS_OK;
+}
+
 int PS4_SYSV_ABI sceKernelAddUserEvent(SceKernelEqueue eq, int id) {
     if (eq == nullptr) {
         return ORBIS_KERNEL_ERROR_EBADF;
     }
 
-    Kernel::EqueueEvent event{};
+    EqueueEvent event{};
-    event.isTriggered = false;
     event.event.ident = id;
-    event.event.filter = Kernel::EVFILT_USER;
+    event.event.filter = SceKernelEvent::Filter::User;
     event.event.udata = 0;
-    event.event.flags = 1;
+    event.event.flags = SceKernelEvent::Flags::Add;
     event.event.fflags = 0;
     event.event.data = 0;
 
-    return eq->addEvent(event);
+    return eq->AddEvent(event) ? ORBIS_OK : ORBIS_KERNEL_ERROR_ENOMEM;
 }
 
 int PS4_SYSV_ABI sceKernelAddUserEventEdge(SceKernelEqueue eq, int id) {
@@ -100,33 +169,41 @@ int PS4_SYSV_ABI sceKernelAddUserEventEdge(SceKernelEqueue eq, int id) {
         return ORBIS_KERNEL_ERROR_EBADF;
     }
 
-    Kernel::EqueueEvent event{};
+    EqueueEvent event{};
-    event.isTriggered = false;
     event.event.ident = id;
-    event.event.filter = Kernel::EVFILT_USER;
+    event.event.filter = SceKernelEvent::Filter::User;
     event.event.udata = 0;
-    event.event.flags = 0x21;
+    event.event.flags = SceKernelEvent::Flags::Add | SceKernelEvent::Flags::Clear;
     event.event.fflags = 0;
     event.event.data = 0;
 
-    return eq->addEvent(event);
+    return eq->AddEvent(event) ? ORBIS_OK : ORBIS_KERNEL_ERROR_ENOMEM;
 }
 
 void* PS4_SYSV_ABI sceKernelGetEventUserData(const SceKernelEvent* ev) {
-    if (!ev) {
+    ASSERT(ev);
-        return nullptr;
-    }
-
     return ev->udata;
 }
 
 int PS4_SYSV_ABI sceKernelTriggerUserEvent(SceKernelEqueue eq, int id, void* udata) {
-    eq->triggerEvent(id, Kernel::EVFILT_USER, udata);
+    if (eq == nullptr) {
+        return ORBIS_KERNEL_ERROR_EBADF;
+    }
+
+    if (!eq->TriggerEvent(id, SceKernelEvent::Filter::User, udata)) {
+        return ORBIS_KERNEL_ERROR_ENOENT;
+    }
     return ORBIS_OK;
 }
 
 int PS4_SYSV_ABI sceKernelDeleteUserEvent(SceKernelEqueue eq, int id) {
-    eq->removeEvent(id);
+    if (eq == nullptr) {
+        return ORBIS_KERNEL_ERROR_EBADF;
+    }
+
+    if (!eq->RemoveEvent(id)) {
+        return ORBIS_KERNEL_ERROR_ENOENT;
+    }
     return ORBIS_OK;
 }
 

src/core/libraries/kernel/event_queues.h

@@ -19,5 +19,6 @@ int PS4_SYSV_ABI sceKernelTriggerUserEvent(SceKernelEqueue eq, int id, void* uda
 int PS4_SYSV_ABI sceKernelDeleteUserEvent(SceKernelEqueue eq, int id);
 int PS4_SYSV_ABI sceKernelAddUserEvent(SceKernelEqueue eq, int id);
 int PS4_SYSV_ABI sceKernelAddUserEventEdge(SceKernelEqueue eq, int id);
+s32 PS4_SYSV_ABI sceKernelAddHRTimerEvent(SceKernelEqueue eq, int id, timespec* ts, void* udata);
 
 } // namespace Libraries::Kernel

src/core/libraries/kernel/libkernel.cpp

@@ -3,9 +3,14 @@
 
 #include <chrono>
 #include <thread>
+
+#include <boost/asio/io_context.hpp>
+
 #include "common/assert.h"
 #include "common/logging/log.h"
 #include "common/singleton.h"
+#include "common/thread.h"
+#include "core/file_format/psf.h"
 #include "core/file_sys/fs.h"
 #include "core/libraries/error_codes.h"
 #include "core/libraries/kernel/cpu_management.h"
@@ -19,6 +24,7 @@
 #include "core/libraries/libs.h"
 #include "core/linker.h"
 #include "core/memory.h"
+
 #ifdef _WIN64
 #include <io.h>
 #include <objbase.h>
@@ -26,12 +32,43 @@
 #else
 #include <sys/mman.h>
 #endif
-#include <core/file_format/psf.h>
 
 namespace Libraries::Kernel {
 
 static u64 g_stack_chk_guard = 0xDEADBEEF54321ABC; // dummy return
 
+boost::asio::io_context io_context;
+std::mutex m_asio_req;
+std::condition_variable_any cv_asio_req;
+std::atomic<u32> asio_requests;
+std::jthread service_thread;
+
+void KernelSignalRequest() {
+    std::unique_lock lock{m_asio_req};
+    ++asio_requests;
+    cv_asio_req.notify_one();
+}
+
+static void KernelServiceThread(std::stop_token stoken) {
+    Common::SetCurrentThreadName("Kernel_ServiceThread");
+
+    while (!stoken.stop_requested()) {
+        HLE_TRACE;
+        {
+            std::unique_lock lock{m_asio_req};
+            cv_asio_req.wait(lock, stoken, [] { return asio_requests != 0; });
+        }
+        if (stoken.stop_requested()) {
+            break;
+        }
+
+        io_context.run();
+        io_context.reset();
+
+        asio_requests = 0;
+    }
+}
+
 static void* PS4_SYSV_ABI sceKernelGetProcParam() {
     auto* linker = Common::Singleton<Core::Linker>::Instance();
     return reinterpret_cast<void*>(linker->GetProcParam());
@@ -295,8 +332,8 @@ int PS4_SYSV_ABI sceKernelUuidCreate(OrbisKernelUuid* orbisUuid) {
     return 0;
 }
 
-char* PS4_SYSV_ABI sceKernelGetFsSandboxRandomWord() {
+const char* PS4_SYSV_ABI sceKernelGetFsSandboxRandomWord() {
-    char* path = "sys";
+    const char* path = "sys";
     return path;
 }
 
@@ -310,6 +347,8 @@ int PS4_SYSV_ABI _sigprocmask() {
 }
 
 void LibKernel_Register(Core::Loader::SymbolsResolver* sym) {
+    service_thread = std::jthread{KernelServiceThread};
+
     // obj
     LIB_OBJ("f7uOxY9mM1U", "libkernel", 1, "libkernel", 1, 1, &g_stack_chk_guard);
     // misc
@@ -353,6 +392,7 @@ void LibKernel_Register(Core::Loader::SymbolsResolver* sym) {
     LIB_FUNCTION("vz+pg2zdopI", "libkernel", 1, "libkernel", 1, 1, sceKernelGetEventUserData);
     LIB_FUNCTION("4R6-OvI2cEA", "libkernel", 1, "libkernel", 1, 1, sceKernelAddUserEvent);
     LIB_FUNCTION("WDszmSbWuDk", "libkernel", 1, "libkernel", 1, 1, sceKernelAddUserEventEdge);
+    LIB_FUNCTION("R74tt43xP6k", "libkernel", 1, "libkernel", 1, 1, sceKernelAddHRTimerEvent);
     LIB_FUNCTION("F6e0kwo4cnk", "libkernel", 1, "libkernel", 1, 1, sceKernelTriggerUserEvent);
     LIB_FUNCTION("LJDwdSNTnDg", "libkernel", 1, "libkernel", 1, 1, sceKernelDeleteUserEvent);
 

src/core/libraries/videoout/driver.cpp

@@ -196,7 +196,7 @@ void VideoOutDriver::Flip(std::chrono::microseconds timeout) {
     // Trigger flip events for the port.
     for (auto& event : req.port->flip_events) {
         if (event != nullptr) {
-            event->triggerEvent(SCE_VIDEO_OUT_EVENT_FLIP, Kernel::EVFILT_VIDEO_OUT,
+            event->TriggerEvent(SCE_VIDEO_OUT_EVENT_FLIP, Kernel::SceKernelEvent::Filter::VideoOut,
                                 reinterpret_cast<void*>(req.flip_arg));
         }
     }
@@ -252,7 +252,8 @@ void VideoOutDriver::Vblank() {
     // Trigger flip events for the port.
     for (auto& event : main_port.vblank_events) {
         if (event != nullptr) {
-            event->triggerEvent(SCE_VIDEO_OUT_EVENT_VBLANK, Kernel::EVFILT_VIDEO_OUT, nullptr);
+            event->TriggerEvent(SCE_VIDEO_OUT_EVENT_VBLANK,
+                                Kernel::SceKernelEvent::Filter::VideoOut, nullptr);
         }
     }
 }

src/core/libraries/videoout/video_out.cpp

@@ -48,16 +48,15 @@ s32 PS4_SYSV_ABI sceVideoOutAddFlipEvent(Kernel::SceKernelEqueue eq, s32 handle,
     }
 
     Kernel::EqueueEvent event{};
-    event.isTriggered = false;
     event.event.ident = SCE_VIDEO_OUT_EVENT_FLIP;
-    event.event.filter = Kernel::EVFILT_VIDEO_OUT;
+    event.event.filter = Kernel::SceKernelEvent::Filter::VideoOut;
     event.event.udata = udata;
     event.event.fflags = 0;
     event.event.data = 0;
-    event.filter.data = port;
+    event.data = port;
 
     port->flip_events.push_back(eq);
-    return eq->addEvent(event);
+    return eq->AddEvent(event);
 }
 
 s32 PS4_SYSV_ABI sceVideoOutAddVblankEvent(Kernel::SceKernelEqueue eq, s32 handle, void* udata) {
@@ -73,16 +72,15 @@ s32 PS4_SYSV_ABI sceVideoOutAddVblankEvent(Kernel::SceKernelEqueue eq, s32 handl
     }
 
     Kernel::EqueueEvent event{};
-    event.isTriggered = false;
     event.event.ident = SCE_VIDEO_OUT_EVENT_VBLANK;
-    event.event.filter = Kernel::EVFILT_VIDEO_OUT;
+    event.event.filter = Kernel::SceKernelEvent::Filter::VideoOut;
     event.event.udata = udata;
     event.event.fflags = 0;
     event.event.data = 0;
-    event.filter.data = port;
+    event.data = port;
 
     port->vblank_events.push_back(eq);
-    return eq->addEvent(event);
+    return eq->AddEvent(event);
 }
 
 s32 PS4_SYSV_ABI sceVideoOutRegisterBuffers(s32 handle, s32 startIndex, void* const* addresses,