kern: SvcChangeKernelTraceState

libraries/libmesosphere/include/mesosphere/kern_k_trace.hpp

@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2018-2020 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 <mesosphere/kern_common.hpp>
+#include <mesosphere/kern_k_spin_lock.hpp>
+
+namespace ams::kern {
+
+    #if defined(MESOSPHERE_BUILD_FOR_TRACING)
+        constexpr inline bool IsKTraceEnabled = true;
+    #else
+        constexpr inline bool IsKTraceEnabled = false;
+    #endif
+
+    constexpr inline size_t KTraceBufferSize = IsKTraceEnabled ? 16_MB : 0;
+
+    static_assert(IsKTraceEnabled || !IsKTraceEnabled);
+
+    class KTrace {
+        private:
+            static bool s_is_active;
+        public:
+            static void Initialize(KVirtualAddress address, size_t size);
+            static void Start();
+            static void Stop();
+
+            static ALWAYS_INLINE bool IsActive() { return s_is_active; }
+    };
+
+}
+
+#define MESOSPHERE_KTRACE_RESUME()                    \
+    ({                                                \
+        if constexpr (::ams::kern::IsKTraceEnabled) { \
+            ::ams::kern::KTrace::Start();             \
+        }                                             \
+    })
+
+#define MESOSPHERE_KTRACE_PAUSE()                     \
+    ({                                                \
+        if constexpr (::ams::kern::IsKTraceEnabled) { \
+            ::ams::kern::KTrace::Stop();              \
+        }                                             \
+    })