kern: add InfoType_IsSvcPermitted

libraries/libstratosphere/source/os/impl/os_disable_counter.os.horizon.hpp

@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+#include <stratosphere.hpp>
+
+namespace ams::os::impl {
+
+    class CheckBusyMutexPermission {
+        public:
+            CheckBusyMutexPermission() {
+                /* In order to use the disable counter, we must support SynchronizePreemptionState. */
+                u64 value;
+                R_ABORT_UNLESS(svc::GetInfo(std::addressof(value), svc::InfoType_IsSvcPermitted, 0, svc::SvcId_SynchronizePreemptionState));
+
+                /* Verify that it's supported. */
+                AMS_ABORT_UNLESS(value != 0);
+            }
+    };
+
+    ALWAYS_INLINE void CallCheckBusyMutexPermission() {
+        AMS_FUNCTION_LOCAL_STATIC(CheckBusyMutexPermission, s_check);
+        AMS_UNUSED(s_check);
+    }
+
+}