fusee_cpp: add logic for loading mtc overlays

fusee_cpp/program/source/fusee_secondary_archive.hpp

@@ -23,15 +23,57 @@ namespace ams::nxboot {
 
     constexpr inline const size_t InitialProcessStorageSizeMax = 3_MB / 8;
 
-    struct SecondaryArchiveHeader {
-        /* TODO */
-        u8 data[1_MB];
+    struct SecondaryArchiveContentMeta {
+        u32 offset;
+        u32 size;
+        u8 type;
+        u8 flags[3];
+        u32 pad;
+        char name[0x10];
     };
+    static_assert(sizeof(SecondaryArchiveContentMeta) == 0x20);
+
+    struct SecondaryArchiveKipMeta {
+        u64 program_id;
+        u32 offset;
+        u32 size;
+    };
+    static_assert(sizeof(SecondaryArchiveKipMeta) == 0x10);
+
+    struct SecondaryArchiveHeader {
+        static constexpr u32 Magic = util::FourCC<'F','S','S','0'>::Code;
+
+        u32 reserved0; /* Previously entrypoint. */
+        u32 metadata_offset;
+        u32 revision;
+        u32 num_kips;
+        u32 reserved1[4];
+        u32 magic;
+        u32 total_size;
+        u32 reserved2; /* Previously crt0 offset. */
+        u32 content_header_offset;
+        u32 num_content_headers;
+        u32 supported_hos_version;
+        u32 release_version;
+        u32 git_revision;
+        SecondaryArchiveContentMeta content_metas[(0x400 - 0x40) / sizeof(SecondaryArchiveContentMeta)];
+        SecondaryArchiveKipMeta emummc_meta;
+        SecondaryArchiveKipMeta kip_metas[8];
+        u8 reserved3[0x800 - 0x490];
+    };
+    static_assert(sizeof(SecondaryArchiveHeader) == 0x800);
 
     struct SecondaryArchive {
-        SecondaryArchiveHeader header;
-        u8 kips[8][InitialProcessStorageSizeMax];
-        u8 splash_screen_framebuffer[FrameBufferSize];
+        SecondaryArchiveHeader header;        /* 0x000000-0x000800 */
+        u8 warmboot[0x1800];                  /* 0x000800-0x002000 */
+        u8 tsec_keygen[0x2000];               /* 0x002000-0x004000 */
+        u8 mariko_fatal[0x1C000];             /* 0x004000-0x020000 */
+        u8 ovl_mtc_erista[0x14000];           /* 0x020000-0x034000 */
+        u8 ovl_mtc_mariko[0x14000];           /* 0x034000-0x048000 */
+        u8 exosphere[0x10000];                /* 0x048000-0x058000 */
+        u8 mesosphere[0xA8000];               /* 0x058000-0x100000 */
+        u8 kips[3_MB];                        /* 0x100000-0x400000 */
+        u8 splash_screen_fb[FrameBufferSize]; /* 0x400000-0x7C0000 */
     };
     static_assert(sizeof(SecondaryArchive) == SecondaryArchiveSize);