sdmmc: begin skeletoning sdmmc driver

libraries/libvapours/include/vapours/sdmmc/sdmmc_mmc.hpp

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+/*
+ * 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 <vapours/sdmmc/sdmmc_build_config.hpp>
+
+
+namespace ams::sdmmc {
+
+    enum MmcPartition {
+        MmcPartition_UserData       = 0,
+        MmcPartition_BootPartition1 = 1,
+        MmcPartition_BootPartition2 = 2,
+        MmcPartition_Unknown        = 3,
+    };
+
+    constexpr inline size_t MmcExtendedCsdSize = 0x200;
+    constexpr inline size_t MmcWorkBufferSize  = MmcExtendedCsdSize;
+
+    void SetMmcWorkBuffer(Port port, void *buffer, size_t buffer_size);
+    void PutMmcToSleep(Port port);
+    void AwakenMmc(Port port);
+    Result SelectMmcPartition(Port port, MmcPartition mmc_partition);
+    Result EraseMmc(Port port);
+    Result GetMmcBootPartitionCapacity(u32 *out_num_sectors, Port port);
+    Result GetMmcExtendedCsd(void *out_buffer, size_t buffer_size, Port port);
+
+
+}