boot: implement SetInitialClockConfiguration

stratosphere/boot/source/boot_clock_initial_configuration.cpp

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2018-2019 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/>.
+ */
+
+#include "boot_functions.hpp"
+#include "boot_registers_pmc.hpp"
+
+static constexpr u32 PmcClkOutCntrl = PmcBase + APBDEV_PMC_CLK_OUT_CNTRL;
+static constexpr u32 InitialClockOutMask = 0xC4C4;
+
+void Boot::SetInitialClockConfiguration() {
+    /* Write mask to APBDEV_PMC_PWR_DET, then clear APBDEV_PMC_PWR_DET_VAL. */
+    WritePmcRegister(PmcClkOutCntrl, InitialClockOutMask, InitialClockOutMask);
+}