diff --git a/fs_defs.h b/fs_defs.h
index 450abfe..c520468 100644
--- a/fs_defs.h
+++ b/fs_defs.h
@@ -7,6 +7,7 @@
 extern "C" {
 #endif
 
+#include "os_types.h"
 
 /* FS defines and types */
 #define FS_MAX_LOCALPATH_SIZE           511
@@ -15,6 +16,7 @@ extern "C" {
 #define FS_MAX_ARGPATH_SIZE             FS_MAX_FULLPATH_SIZE
 
 #define FS_STATUS_OK                    0
+#define FS_STATUS_EOF                   -2
 #define FS_RET_UNSUPPORTED_CMD          0x0400
 #define FS_RET_NO_ERROR                 0x0000
 #define FS_RET_ALL_ERROR                (u32)(-1)
@@ -65,9 +67,24 @@ typedef struct
 {
     FSAsyncCallback userCallback;
     void            *userContext;
-    void            *ioMsgQueue;
+    OSMessageQueue  *ioMsgQueue;
 } FSAsyncParams;
 
+typedef struct{
+    void*               data; // pointer to a FSAsyncResult;
+    u32                 unkwn1;
+    u32                 unkwn2;
+    u32                 unkwn3; // always 0x08
+} __attribute__((packed)) FSMessage;
+
+typedef struct FSAsyncResult_{
+    FSAsyncParams       userParams;
+    FSMessage           ioMsg;
+
+    struct FSClient *          client;
+    struct FSCmdBlock *        block;
+    u32                 result;
+} FSAsyncResult;
 
 #ifdef __cplusplus
 }
diff --git a/fs_functions.c b/fs_functions.c
index e4629a0..abf6f09 100644
--- a/fs_functions.c
+++ b/fs_functions.c
@@ -67,7 +67,7 @@ EXPORT_DECL(s32, FSCloseFile, void *pClient, void *pCmd, s32 fd, s32 errHandling
 EXPORT_DECL(s32, FSFlushFile, void *pClient, void *pCmd, s32 fd, s32 error);
 EXPORT_DECL(s32, FSTruncateFile, void *pClient, void *pCmd, s32 fd, s32 error);
 EXPORT_DECL(s32, FSGetStatFile, void *pClient, void *pCmd, s32 fd, void *buffer, s32 error);
-EXPORT_DECL(s32, FSSetPosFile, void *pClient, void *pCmd, s32 fd, s32 pos, s32 error);
+EXPORT_DECL(s32, FSSetPosFile, void *pClient, void *pCmd, s32 fd, u32 pos, s32 error);
 EXPORT_DECL(s32, FSWriteFile, void *pClient, void *pCmd, const void *source, s32 block_size, s32 block_count, s32 fd, s32 flag, s32 error);
 
 EXPORT_DECL(s32, FSBindMount, void *pClient, void *pCmd, char *source, char *target, s32 error);
diff --git a/fs_functions.h b/fs_functions.h
index 325bf5c..4fefb59 100644
--- a/fs_functions.h
+++ b/fs_functions.h
@@ -80,7 +80,7 @@ extern s32 (* FSCloseFile)(void *pClient, void *pCmd, s32 fd, s32 errHandling);
 extern s32 (* FSFlushFile)(void *pClient, void *pCmd, s32 fd, s32 error);
 extern s32 (* FSTruncateFile)(void *pClient, void *pCmd, s32 fd, s32 error);
 extern s32 (* FSGetStatFile)(void *pClient, void *pCmd, s32 fd, void *buffer, s32 error);
-extern s32 (* FSSetPosFile)(void *pClient, void *pCmd, s32 fd, s32 pos, s32 error);
+extern s32 (* FSSetPosFile)(void *pClient, void *pCmd, s32 fd, u32 pos, s32 error);
 extern s32 (* FSWriteFile)(void *pClient, void *pCmd, const void *source, s32 block_size, s32 block_count, s32 fd, s32 flag, s32 error);
 
 extern s32 (* FSBindMount)(void *pClient, void *pCmd, char *source, char *target, s32 error);
diff --git a/os_types.h b/os_types.h
index 0440c4b..a600e51 100644
--- a/os_types.h
+++ b/os_types.h
@@ -94,6 +94,26 @@ typedef struct OSContext_ {
 	u32 mmcr1;
 } OSContext;
 
+typedef enum OSExceptionType
+{
+   OS_EXCEPTION_TYPE_SYSTEM_RESET         = 0,
+   OS_EXCEPTION_TYPE_MACHINE_CHECK        = 1,
+   OS_EXCEPTION_TYPE_DSI                  = 2,
+   OS_EXCEPTION_TYPE_ISI                  = 3,
+   OS_EXCEPTION_TYPE_EXTERNAL_INTERRUPT   = 4,
+   OS_EXCEPTION_TYPE_ALIGNMENT            = 5,
+   OS_EXCEPTION_TYPE_PROGRAM              = 6,
+   OS_EXCEPTION_TYPE_FLOATING_POINT       = 7,
+   OS_EXCEPTION_TYPE_DECREMENTER          = 8,
+   OS_EXCEPTION_TYPE_SYSTEM_CALL          = 9,
+   OS_EXCEPTION_TYPE_TRACE                = 10,
+   OS_EXCEPTION_TYPE_PERFORMANCE_MONITOR  = 11,
+   OS_EXCEPTION_TYPE_BREAKPOINT           = 12,
+   OS_EXCEPTION_TYPE_SYSTEM_INTERRUPT     = 13,
+   OS_EXCEPTION_TYPE_ICI                  = 14,
+} OSExceptionType;
+
+
 typedef int (*ThreadFunc)(int argc, void *argv);
 
 struct OSThread_ {