PRODINFO: Revamp blanking/write disallow policy. (#913)

* exo/fusee: hookup new prodinfo settings

* fusee: new scheme doesn't need FLAGS_DEFAULT

* fusee: fix c/p errors

* ams.mitm: completely revamp prodinfo backup mechanism

* ams.mitm: Implement revamped blanking/write policy

* strat: make early boot more debuggable

* exo: condense flag logic

stratosphere/ams_mitm/source/amsmitm_prodinfo_utils.hpp

@@ -0,0 +1,39 @@
+/*
+ * 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 <stratosphere.hpp>
+
+namespace ams::mitm {
+
+    constexpr inline size_t CalibrationBinarySize             = 0x8000;
+
+    constexpr inline s64 SecureCalibrationInfoBackupOffset    = 3_MB;
+    constexpr inline size_t SecureCalibrationBinaryBackupSize = 0xC000;
+
+    void InitializeProdInfoManagement();
+
+    void SaveProdInfoBackupsAndWipeMemory(char *out_name, size_t out_name_size);
+
+    bool ShouldReadBlankCalibrationBinary();
+    bool IsWriteToCalibrationBinaryAllowed();
+
+    void ReadFromBlankCalibrationBinary(s64 offset, void *dst, size_t size);
+    void WriteToBlankCalibrationBinary(s64 offset, const void *src, size_t size);
+
+    void ReadFromFakeSecureBackupStorage(s64 offset, void *dst, size_t size);
+    void WriteToFakeSecureBackupStorage(s64 offset, const void *src, size_t size);
+
+}