12 files changed, 312 insertions, 9 deletions

diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index f09edb817..51e4088d2 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -40,6 +40,8 @@ add_library(core STATIC
     hle/config_mem.h
     hle/ipc.h
     hle/ipc_helpers.h
+    hle/kernel/address_arbiter.cpp
+    hle/kernel/address_arbiter.h
     hle/kernel/client_port.cpp
     hle/kernel/client_port.h
     hle/kernel/client_session.cpp
diff --git a/src/core/hle/kernel/address_arbiter.cpp b/src/core/hle/kernel/address_arbiter.cpp
new file mode 100644
index 000000000..e9c8369d7
--- /dev/null
+++ b/src/core/hle/kernel/address_arbiter.cpp
@@ -0,0 +1,173 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "common/assert.h"
+#include "common/common_funcs.h"
+#include "common/common_types.h"
+#include "core/core.h"
+#include "core/hle/kernel/errors.h"
+#include "core/hle/kernel/kernel.h"
+#include "core/hle/kernel/process.h"
+#include "core/hle/kernel/thread.h"
+#include "core/hle/lock.h"
+#include "core/memory.h"
+
+namespace Kernel {
+namespace AddressArbiter {
+
+// Performs actual address waiting logic.
+static ResultCode WaitForAddress(VAddr address, s64 timeout) {
+    SharedPtr<Thread> current_thread = GetCurrentThread();
+    current_thread->arb_wait_address = address;
+    current_thread->status = THREADSTATUS_WAIT_ARB;
+    current_thread->wakeup_callback = nullptr;
+
+    current_thread->WakeAfterDelay(timeout);
+
+    Core::System::GetInstance().CpuCore(current_thread->processor_id).PrepareReschedule();
+    return RESULT_TIMEOUT;
+}
+
+// Gets the threads waiting on an address.
+static void GetThreadsWaitingOnAddress(std::vector<SharedPtr<Thread>>& waiting_threads,
+                                       VAddr address) {
+    auto RetrieveWaitingThreads =
+        [](size_t core_index, std::vector<SharedPtr<Thread>>& waiting_threads, VAddr arb_addr) {
+            const auto& scheduler = Core::System::GetInstance().Scheduler(core_index);
+            auto& thread_list = scheduler->GetThreadList();
+
+            for (auto& thread : thread_list) {
+                if (thread->arb_wait_address == arb_addr)
+                    waiting_threads.push_back(thread);
+            }
+        };
+
+    // Retrieve a list of all threads that are waiting for this address.
+    RetrieveWaitingThreads(0, waiting_threads, address);
+    RetrieveWaitingThreads(1, waiting_threads, address);
+    RetrieveWaitingThreads(2, waiting_threads, address);
+    RetrieveWaitingThreads(3, waiting_threads, address);
+    // Sort them by priority, such that the highest priority ones come first.
+    std::sort(waiting_threads.begin(), waiting_threads.end(),
+              [](const SharedPtr<Thread>& lhs, const SharedPtr<Thread>& rhs) {
+                  return lhs->current_priority < rhs->current_priority;
+              });
+}
+
+// Wake up num_to_wake (or all) threads in a vector.
+static void WakeThreads(std::vector<SharedPtr<Thread>>& waiting_threads, s32 num_to_wake) {
+    // Only process up to 'target' threads, unless 'target' is <= 0, in which case process
+    // them all.
+    size_t last = waiting_threads.size();
+    if (num_to_wake > 0)
+        last = num_to_wake;
+
+    // Signal the waiting threads.
+    for (size_t i = 0; i < last; i++) {
+        ASSERT(waiting_threads[i]->status = THREADSTATUS_WAIT_ARB);
+        waiting_threads[i]->SetWaitSynchronizationResult(RESULT_SUCCESS);
+        waiting_threads[i]->arb_wait_address = 0;
+        waiting_threads[i]->ResumeFromWait();
+    }
+}
+
+// Signals an address being waited on.
+ResultCode SignalToAddress(VAddr address, s32 num_to_wake) {
+    // Get threads waiting on the address.
+    std::vector<SharedPtr<Thread>> waiting_threads;
+    GetThreadsWaitingOnAddress(waiting_threads, address);
+
+    WakeThreads(waiting_threads, num_to_wake);
+    return RESULT_SUCCESS;
+}
+
+// Signals an address being waited on and increments its value if equal to the value argument.
+ResultCode IncrementAndSignalToAddressIfEqual(VAddr address, s32 value, s32 num_to_wake) {
+    // Ensure that we can write to the address.
+    if (!Memory::IsValidVirtualAddress(address)) {
+        return ERR_INVALID_ADDRESS_STATE;
+    }
+
+    if (static_cast<s32>(Memory::Read32(address)) == value) {
+        Memory::Write32(address, static_cast<u32>(value + 1));
+    } else {
+        return ERR_INVALID_STATE;
+    }
+
+    return SignalToAddress(address, num_to_wake);
+}
+
+// Signals an address being waited on and modifies its value based on waiting thread count if equal
+// to the value argument.
+ResultCode ModifyByWaitingCountAndSignalToAddressIfEqual(VAddr address, s32 value,
+                                                         s32 num_to_wake) {
+    // Ensure that we can write to the address.
+    if (!Memory::IsValidVirtualAddress(address)) {
+        return ERR_INVALID_ADDRESS_STATE;
+    }
+
+    // Get threads waiting on the address.
+    std::vector<SharedPtr<Thread>> waiting_threads;
+    GetThreadsWaitingOnAddress(waiting_threads, address);
+
+    // Determine the modified value depending on the waiting count.
+    s32 updated_value;
+    if (waiting_threads.size() == 0) {
+        updated_value = value - 1;
+    } else if (num_to_wake <= 0 || waiting_threads.size() <= num_to_wake) {
+        updated_value = value + 1;
+    } else {
+        updated_value = value;
+    }
+
+    if (static_cast<s32>(Memory::Read32(address)) == value) {
+        Memory::Write32(address, static_cast<u32>(updated_value));
+    } else {
+        return ERR_INVALID_STATE;
+    }
+
+    WakeThreads(waiting_threads, num_to_wake);
+    return RESULT_SUCCESS;
+}
+
+// Waits on an address if the value passed is less than the argument value, optionally decrementing.
+ResultCode WaitForAddressIfLessThan(VAddr address, s32 value, s64 timeout, bool should_decrement) {
+    // Ensure that we can read the address.
+    if (!Memory::IsValidVirtualAddress(address)) {
+        return ERR_INVALID_ADDRESS_STATE;
+    }
+
+    s32 cur_value = static_cast<s32>(Memory::Read32(address));
+    if (cur_value < value) {
+        Memory::Write32(address, static_cast<u32>(cur_value - 1));
+    } else {
+        return ERR_INVALID_STATE;
+    }
+    // Short-circuit without rescheduling, if timeout is zero.
+    if (timeout == 0) {
+        return RESULT_TIMEOUT;
+    }
+
+    return WaitForAddress(address, timeout);
+}
+
+// Waits on an address if the value passed is equal to the argument value.
+ResultCode WaitForAddressIfEqual(VAddr address, s32 value, s64 timeout) {
+    // Ensure that we can read the address.
+    if (!Memory::IsValidVirtualAddress(address)) {
+        return ERR_INVALID_ADDRESS_STATE;
+    }
+    // Only wait for the address if equal.
+    if (static_cast<s32>(Memory::Read32(address)) != value) {
+        return ERR_INVALID_STATE;
+    }
+    // Short-circuit without rescheduling, if timeout is zero.
+    if (timeout == 0) {
+        return RESULT_TIMEOUT;
+    }
+
+    return WaitForAddress(address, timeout);
+}
+} // namespace AddressArbiter
+} // namespace Kernel
diff --git a/src/core/hle/kernel/address_arbiter.h b/src/core/hle/kernel/address_arbiter.h
new file mode 100644
index 000000000..f20f3dbc0
--- /dev/null
+++ b/src/core/hle/kernel/address_arbiter.h
@@ -0,0 +1,32 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "core/hle/result.h"
+
+namespace Kernel {
+
+namespace AddressArbiter {
+enum class ArbitrationType {
+    WaitIfLessThan = 0,
+    DecrementAndWaitIfLessThan = 1,
+    WaitIfEqual = 2,
+};
+
+enum class SignalType {
+    Signal = 0,
+    IncrementAndSignalIfEqual = 1,
+    ModifyByWaitingCountAndSignalIfEqual = 2,
+};
+
+ResultCode SignalToAddress(VAddr address, s32 num_to_wake);
+ResultCode IncrementAndSignalToAddressIfEqual(VAddr address, s32 value, s32 num_to_wake);
+ResultCode ModifyByWaitingCountAndSignalToAddressIfEqual(VAddr address, s32 value, s32 num_to_wake);
+
+ResultCode WaitForAddressIfLessThan(VAddr address, s32 value, s64 timeout, bool should_decrement);
+ResultCode WaitForAddressIfEqual(VAddr address, s32 value, s64 timeout);
+} // namespace AddressArbiter
+
+} // namespace Kernel
diff --git a/src/core/hle/kernel/errors.h b/src/core/hle/kernel/errors.h
index e1b5430bf..221cb1bb5 100644
--- a/src/core/hle/kernel/errors.h
+++ b/src/core/hle/kernel/errors.h
@@ -20,13 +20,16 @@ enum {
     MaxConnectionsReached = 52,
 
     // Confirmed Switch OS error codes
-    MisalignedAddress = 102,
+    InvalidAddress = 102,
+    InvalidMemoryState = 106,
     InvalidProcessorId = 113,
     InvalidHandle = 114,
     InvalidCombination = 116,
     Timeout = 117,
     SynchronizationCanceled = 118,
     TooLarge = 119,
+    InvalidEnumValue = 120,
+    InvalidState = 125,
 };
 }
 
@@ -39,14 +42,15 @@ constexpr ResultCode ERR_SESSION_CLOSED_BY_REMOTE(-1);
 constexpr ResultCode ERR_PORT_NAME_TOO_LONG(-1);
 constexpr ResultCode ERR_WRONG_PERMISSION(-1);
 constexpr ResultCode ERR_MAX_CONNECTIONS_REACHED(-1);
-constexpr ResultCode ERR_INVALID_ENUM_VALUE(-1);
+constexpr ResultCode ERR_INVALID_ENUM_VALUE(ErrorModule::Kernel, ErrCodes::InvalidEnumValue);
 constexpr ResultCode ERR_INVALID_ENUM_VALUE_FND(-1);
 constexpr ResultCode ERR_INVALID_COMBINATION(-1);
 constexpr ResultCode ERR_INVALID_COMBINATION_KERNEL(-1);
 constexpr ResultCode ERR_OUT_OF_MEMORY(-1);
-constexpr ResultCode ERR_INVALID_ADDRESS(-1);
-constexpr ResultCode ERR_INVALID_ADDRESS_STATE(-1);
+constexpr ResultCode ERR_INVALID_ADDRESS(ErrorModule::Kernel, ErrCodes::InvalidAddress);
+constexpr ResultCode ERR_INVALID_ADDRESS_STATE(ErrorModule::Kernel, ErrCodes::InvalidMemoryState);
 constexpr ResultCode ERR_INVALID_HANDLE(ErrorModule::Kernel, ErrCodes::InvalidHandle);
+constexpr ResultCode ERR_INVALID_STATE(ErrorModule::Kernel, ErrCodes::InvalidState);
 constexpr ResultCode ERR_INVALID_POINTER(-1);
 constexpr ResultCode ERR_INVALID_OBJECT_ADDR(-1);
 constexpr ResultCode ERR_NOT_AUTHORIZED(-1);
diff --git a/src/core/hle/kernel/mutex.cpp b/src/core/hle/kernel/mutex.cpp
index bc144f3de..65560226d 100644
--- a/src/core/hle/kernel/mutex.cpp
+++ b/src/core/hle/kernel/mutex.cpp
@@ -59,7 +59,7 @@ ResultCode Mutex::TryAcquire(VAddr address, Handle holding_thread_handle,
                              Handle requesting_thread_handle) {
     // The mutex address must be 4-byte aligned
     if ((address % sizeof(u32)) != 0) {
-        return ResultCode(ErrorModule::Kernel, ErrCodes::MisalignedAddress);
+        return ResultCode(ErrorModule::Kernel, ErrCodes::InvalidAddress);
     }
 
     SharedPtr<Thread> holding_thread = g_handle_table.Get<Thread>(holding_thread_handle);
@@ -97,7 +97,7 @@ ResultCode Mutex::TryAcquire(VAddr address, Handle holding_thread_handle,
 ResultCode Mutex::Release(VAddr address) {
     // The mutex address must be 4-byte aligned
     if ((address % sizeof(u32)) != 0) {
-        return ResultCode(ErrorModule::Kernel, ErrCodes::MisalignedAddress);
+        return ResultCode(ErrorModule::Kernel, ErrCodes::InvalidAddress);
     }
 
     auto [thread, num_waiters] = GetHighestPriorityMutexWaitingThread(GetCurrentThread(), address);
diff --git a/src/core/hle/kernel/svc.cpp b/src/core/hle/kernel/svc.cpp
index 69ba7b777..1a36e0d02 100644
--- a/src/core/hle/kernel/svc.cpp
+++ b/src/core/hle/kernel/svc.cpp
@@ -11,6 +11,7 @@
 #include "common/string_util.h"
 #include "core/core.h"
 #include "core/core_timing.h"
+#include "core/hle/kernel/address_arbiter.h"
 #include "core/hle/kernel/client_port.h"
 #include "core/hle/kernel/client_session.h"
 #include "core/hle/kernel/event.h"
@@ -580,7 +581,7 @@ static void SleepThread(s64 nanoseconds) {
     Core::System::GetInstance().PrepareReschedule();
 }
 
-/// Signal process wide key atomic
+/// Wait process wide key atomic
 static ResultCode WaitProcessWideKeyAtomic(VAddr mutex_addr, VAddr condition_variable_addr,
                                            Handle thread_handle, s64 nano_seconds) {
     NGLOG_TRACE(
@@ -689,6 +690,58 @@ static ResultCode SignalProcessWideKey(VAddr condition_variable_addr, s32 target
     return RESULT_SUCCESS;
 }
 
+// Wait for an address (via Address Arbiter)
+static ResultCode WaitForAddress(VAddr address, u32 type, s32 value, s64 timeout) {
+    NGLOG_WARNING(Kernel_SVC, "called, address=0x{:X}, type=0x{:X}, value=0x{:X}, timeout={}",
+                  address, type, value, timeout);
+    // If the passed address is a kernel virtual address, return invalid memory state.
+    if (Memory::IsKernelVirtualAddress(address)) {
+        return ERR_INVALID_ADDRESS_STATE;
+    }
+    // If the address is not properly aligned to 4 bytes, return invalid address.
+    if (address % sizeof(u32) != 0) {
+        return ERR_INVALID_ADDRESS;
+    }
+
+    switch (static_cast<AddressArbiter::ArbitrationType>(type)) {
+    case AddressArbiter::ArbitrationType::WaitIfLessThan:
+        return AddressArbiter::WaitForAddressIfLessThan(address, value, timeout, false);
+    case AddressArbiter::ArbitrationType::DecrementAndWaitIfLessThan:
+        return AddressArbiter::WaitForAddressIfLessThan(address, value, timeout, true);
+    case AddressArbiter::ArbitrationType::WaitIfEqual:
+        return AddressArbiter::WaitForAddressIfEqual(address, value, timeout);
+    default:
+        return ERR_INVALID_ENUM_VALUE;
+    }
+}
+
+// Signals to an address (via Address Arbiter)
+static ResultCode SignalToAddress(VAddr address, u32 type, s32 value, s32 num_to_wake) {
+    NGLOG_WARNING(Kernel_SVC,
+                  "called, address=0x{:X}, type=0x{:X}, value=0x{:X}, num_to_wake=0x{:X}", address,
+                  type, value, num_to_wake);
+    // If the passed address is a kernel virtual address, return invalid memory state.
+    if (Memory::IsKernelVirtualAddress(address)) {
+        return ERR_INVALID_ADDRESS_STATE;
+    }
+    // If the address is not properly aligned to 4 bytes, return invalid address.
+    if (address % sizeof(u32) != 0) {
+        return ERR_INVALID_ADDRESS;
+    }
+
+    switch (static_cast<AddressArbiter::SignalType>(type)) {
+    case AddressArbiter::SignalType::Signal:
+        return AddressArbiter::SignalToAddress(address, num_to_wake);
+    case AddressArbiter::SignalType::IncrementAndSignalIfEqual:
+        return AddressArbiter::IncrementAndSignalToAddressIfEqual(address, value, num_to_wake);
+    case AddressArbiter::SignalType::ModifyByWaitingCountAndSignalIfEqual:
+        return AddressArbiter::ModifyByWaitingCountAndSignalToAddressIfEqual(address, value,
+                                                                             num_to_wake);
+    default:
+        return ERR_INVALID_ENUM_VALUE;
+    }
+}
+
 /// This returns the total CPU ticks elapsed since the CPU was powered-on
 static u64 GetSystemTick() {
     const u64 result{CoreTiming::GetTicks()};
@@ -861,8 +914,8 @@ static const FunctionDef SVC_Table[] = {
     {0x31, nullptr, "GetResourceLimitCurrentValue"},
     {0x32, SvcWrap<SetThreadActivity>, "SetThreadActivity"},
     {0x33, SvcWrap<GetThreadContext>, "GetThreadContext"},
-    {0x34, nullptr, "WaitForAddress"},
-    {0x35, nullptr, "SignalToAddress"},
+    {0x34, SvcWrap<WaitForAddress>, "WaitForAddress"},
+    {0x35, SvcWrap<SignalToAddress>, "SignalToAddress"},
     {0x36, nullptr, "Unknown"},
     {0x37, nullptr, "Unknown"},
     {0x38, nullptr, "Unknown"},
diff --git a/src/core/hle/kernel/svc_wrap.h b/src/core/hle/kernel/svc_wrap.h
index 40aa88cc1..79c3fe31b 100644
--- a/src/core/hle/kernel/svc_wrap.h
+++ b/src/core/hle/kernel/svc_wrap.h
@@ -179,6 +179,20 @@ void SvcWrap() {
     FuncReturn(retval);
 }
 
+template <ResultCode func(u64, u32, s32, s64)>
+void SvcWrap() {
+    FuncReturn(
+        func(PARAM(0), (u32)(PARAM(1) & 0xFFFFFFFF), (s32)(PARAM(2) & 0xFFFFFFFF), (s64)PARAM(3))
+            .raw);
+}
+
+template <ResultCode func(u64, u32, s32, s32)>
+void SvcWrap() {
+    FuncReturn(func(PARAM(0), (u32)(PARAM(1) & 0xFFFFFFFF), (s32)(PARAM(2) & 0xFFFFFFFF),
+                    (s32)(PARAM(3) & 0xFFFFFFFF))
+                   .raw);
+}
+
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 // Function wrappers that return type u32
 
diff --git a/src/core/hle/kernel/thread.cpp b/src/core/hle/kernel/thread.cpp
index cffa7ca83..2f333ec34 100644
--- a/src/core/hle/kernel/thread.cpp
+++ b/src/core/hle/kernel/thread.cpp
@@ -140,6 +140,11 @@ static void ThreadWakeupCallback(u64 thread_handle, int cycles_late) {
         }
     }
 
+    if (thread->arb_wait_address != 0) {
+        ASSERT(thread->status == THREADSTATUS_WAIT_ARB);
+        thread->arb_wait_address = 0;
+    }
+
     if (resume)
         thread->ResumeFromWait();
 }
@@ -179,6 +184,7 @@ void Thread::ResumeFromWait() {
     case THREADSTATUS_WAIT_SLEEP:
     case THREADSTATUS_WAIT_IPC:
     case THREADSTATUS_WAIT_MUTEX:
+    case THREADSTATUS_WAIT_ARB:
         break;
 
     case THREADSTATUS_READY:
diff --git a/src/core/hle/kernel/thread.h b/src/core/hle/kernel/thread.h
index 1d2da6d50..f1e759802 100644
--- a/src/core/hle/kernel/thread.h
+++ b/src/core/hle/kernel/thread.h
@@ -45,6 +45,7 @@ enum ThreadStatus {
     THREADSTATUS_WAIT_SYNCH_ANY, ///< Waiting due to WaitSynch1 or WaitSynchN with wait_all = false
     THREADSTATUS_WAIT_SYNCH_ALL, ///< Waiting due to WaitSynchronizationN with wait_all = true
     THREADSTATUS_WAIT_MUTEX,     ///< Waiting due to an ArbitrateLock/WaitProcessWideKey svc
+    THREADSTATUS_WAIT_ARB,       ///< Waiting due to a SignalToAddress/WaitForAddress svc
     THREADSTATUS_DORMANT,        ///< Created but not yet made ready
     THREADSTATUS_DEAD            ///< Run to completion, or forcefully terminated
 };
@@ -230,6 +231,9 @@ public:
     VAddr mutex_wait_address; ///< If waiting on a Mutex, this is the mutex address
     Handle wait_handle;       ///< The handle used to wait for the mutex.
 
+    // If waiting for an AddressArbiter, this is the address being waited on.
+    VAddr arb_wait_address{0};
+
     std::string name;
 
     /// Handle used by guest emulated application to access this thread
diff --git a/src/core/memory.cpp b/src/core/memory.cpp
index 3b81acd63..f070dee7d 100644
--- a/src/core/memory.cpp
+++ b/src/core/memory.cpp
@@ -241,6 +241,10 @@ bool IsValidVirtualAddress(const VAddr vaddr) {
     return IsValidVirtualAddress(*Core::CurrentProcess(), vaddr);
 }
 
+bool IsKernelVirtualAddress(const VAddr vaddr) {
+    return KERNEL_REGION_VADDR <= vaddr && vaddr < KERNEL_REGION_END;
+}
+
 bool IsValidPhysicalAddress(const PAddr paddr) {
     return GetPhysicalPointer(paddr) != nullptr;
 }
diff --git a/src/core/memory.h b/src/core/memory.h
index 3f56a2c6a..8d5d017a4 100644
--- a/src/core/memory.h
+++ b/src/core/memory.h
@@ -188,6 +188,11 @@ enum : VAddr {
     MAP_REGION_VADDR = NEW_MAP_REGION_VADDR_END,
     MAP_REGION_SIZE = 0x1000000000,
     MAP_REGION_VADDR_END = MAP_REGION_VADDR + MAP_REGION_SIZE,
+
+    /// Kernel Virtual Address Range
+    KERNEL_REGION_VADDR = 0xFFFFFF8000000000,
+    KERNEL_REGION_SIZE = 0x7FFFE00000,
+    KERNEL_REGION_END = KERNEL_REGION_VADDR + KERNEL_REGION_SIZE,
 };
 
 /// Currently active page table
@@ -197,6 +202,8 @@ PageTable* GetCurrentPageTable();
 /// Determines if the given VAddr is valid for the specified process.
 bool IsValidVirtualAddress(const Kernel::Process& process, const VAddr vaddr);
 bool IsValidVirtualAddress(const VAddr addr);
+/// Determines if the given VAddr is a kernel address
+bool IsKernelVirtualAddress(const VAddr addr);
 
 bool IsValidPhysicalAddress(const PAddr addr);
 
diff --git a/src/yuzu/debugger/wait_tree.cpp b/src/yuzu/debugger/wait_tree.cpp
index 017bef13c..7101b381e 100644
--- a/src/yuzu/debugger/wait_tree.cpp
+++ b/src/yuzu/debugger/wait_tree.cpp
@@ -213,6 +213,9 @@ QString WaitTreeThread::GetText() const {
     case THREADSTATUS_WAIT_MUTEX:
         status = tr("waiting for mutex");
         break;
+    case THREADSTATUS_WAIT_ARB:
+        status = tr("waiting for address arbiter");
+        break;
     case THREADSTATUS_DORMANT:
         status = tr("dormant");
         break;
@@ -240,6 +243,7 @@ QColor WaitTreeThread::GetColor() const {
     case THREADSTATUS_WAIT_SYNCH_ALL:
     case THREADSTATUS_WAIT_SYNCH_ANY:
     case THREADSTATUS_WAIT_MUTEX:
+    case THREADSTATUS_WAIT_ARB:
         return QColor(Qt::GlobalColor::red);
     case THREADSTATUS_DORMANT:
         return QColor(Qt::GlobalColor::darkCyan);