1 files changed, 69 insertions, 0 deletions
diff --git a/src/core/hle/kernel/svc/svc_condition_variable.cpp b/src/core/hle/kernel/svc/svc_condition_variable.cpp
new file mode 100644
index 000000000..d6cfc87c5
--- /dev/null
+++ b/src/core/hle/kernel/svc/svc_condition_variable.cpp
@@ -0,0 +1,69 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "core/core.h"
+#include "core/hle/kernel/k_memory_layout.h"
+#include "core/hle/kernel/k_process.h"
+#include "core/hle/kernel/kernel.h"
+#include "core/hle/kernel/svc.h"
+#include "core/hle/kernel/svc_results.h"
+
+namespace Kernel::Svc {
+
+/// Wait process wide key atomic
+Result WaitProcessWideKeyAtomic(Core::System& system, VAddr address, VAddr cv_key, u32 tag,
+                                s64 timeout_ns) {
+    LOG_TRACE(Kernel_SVC, "called address={:X}, cv_key={:X}, tag=0x{:08X}, timeout_ns={}", address,
+              cv_key, tag, timeout_ns);
+
+    // Validate input.
+    if (IsKernelAddress(address)) {
+        LOG_ERROR(Kernel_SVC, "Attempted to wait on kernel address (address={:08X})", address);
+        return ResultInvalidCurrentMemory;
+    }
+    if (!Common::IsAligned(address, sizeof(s32))) {
+        LOG_ERROR(Kernel_SVC, "Address must be 4 byte aligned (address={:08X})", address);
+        return ResultInvalidAddress;
+    }
+
+    // Convert timeout from nanoseconds to ticks.
+    s64 timeout{};
+    if (timeout_ns > 0) {
+        const s64 offset_tick(timeout_ns);
+        if (offset_tick > 0) {
+            timeout = offset_tick + 2;
+            if (timeout <= 0) {
+                timeout = std::numeric_limits<s64>::max();
+            }
+        } else {
+            timeout = std::numeric_limits<s64>::max();
+        }
+    } else {
+        timeout = timeout_ns;
+    }
+
+    // Wait on the condition variable.
+    return system.Kernel().CurrentProcess()->WaitConditionVariable(
+        address, Common::AlignDown(cv_key, sizeof(u32)), tag, timeout);
+}
+
+Result WaitProcessWideKeyAtomic32(Core::System& system, u32 address, u32 cv_key, u32 tag,
+                                  u32 timeout_ns_low, u32 timeout_ns_high) {
+    const auto timeout_ns = static_cast<s64>(timeout_ns_low | (u64{timeout_ns_high} << 32));
+    return WaitProcessWideKeyAtomic(system, address, cv_key, tag, timeout_ns);
+}
+
+/// Signal process wide key
+void SignalProcessWideKey(Core::System& system, VAddr cv_key, s32 count) {
+    LOG_TRACE(Kernel_SVC, "called, cv_key=0x{:X}, count=0x{:08X}", cv_key, count);
+
+    // Signal the condition variable.
+    return system.Kernel().CurrentProcess()->SignalConditionVariable(
+        Common::AlignDown(cv_key, sizeof(u32)), count);
+}
+
+void SignalProcessWideKey32(Core::System& system, u32 cv_key, s32 count) {
+    SignalProcessWideKey(system, cv_key, count);
+}
+
+} // namespace Kernel::Svc