kern: implement uart init + logging

libraries/libmesosphere/include/mesosphere/kern_debug_log.hpp

@@ -0,0 +1,54 @@
+/*
+ * 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>
+
+namespace ams::kern {
+
+    class KDebugLog {
+        private:
+            static NOINLINE void VSNPrintf(char *dst, const size_t dst_size, const char *format, ::std::va_list vl);
+        public:
+            static NOINLINE void Initialize();
+
+            static NOINLINE void Printf(const char *format, ...);
+            static NOINLINE void VPrintf(const char *format, ::std::va_list vl);
+    };
+
+}
+
+#ifndef MESOSPHERE_DEBUG_LOG_SELECTED
+
+    #ifdef ATMOSPHERE_BOARD_NINTENDO_SWITCH
+        #define MESOSPHERE_DEBUG_LOG_USE_UART_A
+    #else
+        #error "Unknown board for Default Debug Log Source"
+    #endif
+
+    #define MESOSPHERE_DEBUG_LOG_SELECTED
+
+#endif
+
+#define MESOSPHERE_RELEASE_LOG(fmt, ...) ::ams::kern::KDebugLog::Printf((fmt), ## __VA_ARGS__)
+#define MESOSPHERE_RELEASE_VLOG(fmt, vl) ::ams::kern::KDebugLog::VPrintf((fmt), (vl))
+
+#ifdef MESOSPHERE_ENABLE_DEBUG_PRINT
+#define MESOSPHERE_LOG(fmt, ...) MESOSPHERE_RELEASE_LOG((fmt), ## __VA_ARGS__)
+#define MESOSPHERE_VLOG(fmt, vl) MESOSPHERE_RELEASE_VLOG((fmt), (vl))
+#else
+#define MESOSPHERE_LOG(fmt, ...)
+#define MESOSPHERE_VLOG(fmt, vl)
+#endif