sd fs: Move sd init/mount/helpers to their own object

bootloader/storage/nx_sd.h

@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2018 naehrwert
+ * Copyright (c) 2018-2019 CTCaer
+ *
+ * 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/>.
+ */
+
+#ifndef NX_SD_H
+#define NX_SD_H
+
+#include "sdmmc.h"
+#include "sdmmc_driver.h"
+#include "../libs/fatfs/ff.h"
+
+sdmmc_t sd_sdmmc;
+sdmmc_storage_t sd_storage;
+FATFS sd_fs;
+
+bool sd_mount();
+void sd_unmount();
+void *sd_file_read(const char *path, u32 *fsize);
+int  sd_save_to_file(void *buf, u32 size, const char *filename);
+
+#endif