frd:u: Initial stub some functions

src/core/hle/service/frd/frd.h

@@ -4,9 +4,97 @@
 
 #pragma once
 
+#include "common/common_types.h"
+
 namespace Service {
+
+class Interface;
+
 namespace FRD {
 
+struct FriendKey {
+    u32 friend_id;
+    u32 unknown;
+    u64 friend_code;
+};
+
+struct MyPresence {
+    u8 unknown[0x12C];
+};
+
+struct Profile {
+    u8 region;
+    u8 country;
+    u8 area;
+    u8 language;
+    u32 unknown;
+};
+
+/**
+ * FRD::GetMyPresence service function
+ *  Inputs:
+ *      64 : sizeof (MyPresence) << 14 | 2
+ *      65 : Address of MyPresence structure
+ *  Outputs:
+ *      1 : Result of function, 0 on success, otherwise error code
+ */
+void GetMyPresence(Service::Interface* self);
+
+/**
+ * FRD::GetFriendKeyList service function
+ *  Inputs:
+ *      1 : Unknown
+ *      2 : Max friends count
+ *      65 : Address of FriendKey List
+ *  Outputs:
+ *      1 : Result of function, 0 on success, otherwise error code
+ *      2 : FriendKey count filled
+ */
+void GetFriendKeyList(Service::Interface* self);
+
+/**
+ * FRD::GetFriendProfile service function
+ *  Inputs:
+ *      1 : Friends count
+ *      2 : Friends count << 18 | 2
+ *      3 : Address of FriendKey List
+ *      64 : (count * sizeof (Profile)) << 10 | 2
+ *      65 : Address of Profiles List
+ *  Outputs:
+ *      1 : Result of function, 0 on success, otherwise error code
+ */
+void GetFriendProfile(Service::Interface* self);
+
+/**
+ * FRD::GetFriendAttributeFlags service function
+ *  Inputs:
+ *      1 : Friends count
+ *      2 : Friends count << 18 | 2
+ *      3 : Address of FriendKey List
+ *      65 : Address of AttributeFlags
+ *  Outputs:
+ *      1 : Result of function, 0 on success, otherwise error code
+ */
+void GetFriendAttributeFlags(Service::Interface* self);
+
+/**
+ * FRD::GetMyFriendKey service function
+ *  Inputs:
+ *      none
+ *  Outputs:
+ *      1 : Result of function, 0 on success, otherwise error code
+ *      2-5 : FriendKey
+ */
+void GetMyFriendKey(Service::Interface* self);
+
+/**
+ * FRD::GetMyScreenName service function
+ *  Outputs:
+ *      1 : Result of function, 0 on success, otherwise error code
+ *      2 : UTF16 encoded name (max 11 symbols)
+ */
+void GetMyScreenName(Service::Interface* self);
+
 /// Initialize FRD service(s)
 void Init();