diff --git a/drivers/ddk/core.S b/drivers/ddk/core.S
index 7f1b073f82..4a7d9bf3aa 100644
--- a/drivers/ddk/core.S
+++ b/drivers/ddk/core.S
@@ -26,9 +26,13 @@
 
     .global _FreeKernelSpace
     .global _FreePage
+    .global _FS_Service
 
     .global _GetClockNs
     .global _GetCpuFreq
+
+    .global _GetCurrSlot
+
     .global _GetDisplay
     .global _GetEvent
     .global _GetPgAddr
@@ -83,8 +87,6 @@
     .global _WaitEvent
     .global _WaitEventTimeout
 
-    .global _FS_Service
-
     .def  _AcpiGetRootPtr;  .scl  2;  .type 32; .endef
 
     .def  _AllocKernelSpace;  .scl  2;  .type 32; .endef
@@ -109,10 +111,11 @@
 
     .def  _FreeKernelSpace;   .scl  2;  .type 32; .endef
     .def  _FreePage;          .scl  2;  .type 32; .endef
+    .def  _FS_Service;        .scl  2;  .type 32; .endef
 
     .def  _GetClockNs;        .scl  2;  .type 32; .endef
 
-    .def  _GetDisplay;        .scl  2;  .type 32; .endef
+    .def  _GetCurrSlot;       .scl  2;  .type 32; .endef
 
     .def  _GetDisplay;        .scl  2;  .type 32; .endef
     .def  _GetEvent;          .scl  2;  .type 32; .endef
@@ -166,9 +169,7 @@
 
     .def  _WaitEvent;         .scl  2;  .type 32; .endef
     .def  _WaitEventTimeout;  .scl  2;  .type 32; .endef
-    
-    .def _FS_Service;         .scl  2;  .type 32; .endef
-    
+
 _AcpiGetRootPtr:
 
 _AllocKernelSpace:
@@ -195,8 +196,13 @@ _DiskMediaChanged:
 _FreeKernelSpace:
 _FreePage:
 
+_FS_Service:
+
 _GetClockNs:
 _GetCpuFreq:
+
+_GetCurrSlot:
+
 _GetDisplay:
 _GetEvent:
 _GetPCIList:
@@ -247,9 +253,6 @@ _UserAlloc:
 _UserFree:
 _WaitEvent:
 _WaitEventTimeout:
-
-_FS_Service:
-
         ret
 
 .section .drectve
@@ -278,8 +281,13 @@ _FS_Service:
         .ascii " -export:FreeKernelSpace"      # stdcall
         .ascii " -export:FreePage"             #
 
+        .ascii " -export:FS_Service"           # watch system call 70
+
         .ascii " -export:GetClockNs"           #
         .ascii " -export:GetCpuFreq"           #
+
+        .ascii " -export:GetCurrSlot"
+
         .ascii " -export:GetDisplay"           # stdcall
         .ascii " -export:GetEvent"             #
         .ascii " -export:GetPCIList"           #
@@ -290,7 +298,6 @@ _FS_Service:
         .ascii " -export:GetStackBase"         #
         .ascii " -export:GetWindowRect"        # fastcall
 
-
         .ascii " -export:KernelAlloc"          # stdcall
         .ascii " -export:KernelFree"           # stdcall
 
@@ -332,4 +339,3 @@ _FS_Service:
 
         .ascii " -export:WaitEvent"            # stdcall
         .ascii " -export:WaitEventTimeout"     # stdcall
-        .ascii " -export:FS_Service"           # watch system call 70
diff --git a/drivers/ddk/linux/mutex.c b/drivers/ddk/linux/mutex.c
index 5bbc5c1108..dba629cae3 100644
--- a/drivers/ddk/linux/mutex.c
+++ b/drivers/ddk/linux/mutex.c
@@ -25,22 +25,6 @@
 #include <linux/spinlock.h>
 #include <syscall.h>
 
-struct  kos_taskdata
-{
-    u32 event_mask;
-    u32 pid;
-    u16 r0;
-    u8  state;
-    u8  r1;
-    u16 r2;
-    u8  wnd_number;
-    u8  r3;
-    u32 mem_start;
-    u32 counter_sum;
-    u32 counter_add;
-    u32 cpu_usage;
-}__attribute__((packed));
-
 static inline void mutex_set_owner(struct mutex *lock)
 {
 }
@@ -144,11 +128,12 @@ ww_mutex_set_context_fastpath(struct ww_mutex *lock,
      */
     flags = safe_cli();
     list_for_each_entry(cur, &lock->base.wait_list, list) {
-        ((struct kos_taskdata*)cur->task)->state = 0;
+        ((struct kos_appdata*)cur->task)->state = KOS_SLOT_STATE_RUNNING;
     }
     safe_sti(flags);
 }
 
+static __always_inline void
 ww_mutex_set_context_slowpath(struct ww_mutex *lock,
                               struct ww_acquire_ctx *ctx)
 {
@@ -162,7 +147,7 @@ ww_mutex_set_context_slowpath(struct ww_mutex *lock,
      * so they can recheck if they have to back off.
      */
     list_for_each_entry(cur, &lock->base.wait_list, list) {
-        ((struct kos_taskdata*)cur->task)->state = 0;
+        ((struct kos_appdata*)cur->task)->state = KOS_SLOT_STATE_RUNNING;
     }
 }
 
@@ -170,13 +155,13 @@ int __ww_mutex_lock_slowpath(struct ww_mutex *ww, struct ww_acquire_ctx *ctx)
 {
     struct mutex *lock;
     struct mutex_waiter waiter;
-    struct kos_taskdata* taskdata;
+    struct kos_appdata *appdata;
     u32 eflags;
     int ret = 0;
 
     lock = &ww->base;
-    taskdata = (struct kos_taskdata*)(0x80003010);
-    waiter.task = (u32*)taskdata;
+    appdata = GetCurrSlot();
+    waiter.task = appdata;
 
     eflags = safe_cli();
 
@@ -192,7 +177,7 @@ int __ww_mutex_lock_slowpath(struct ww_mutex *ww, struct ww_acquire_ctx *ctx)
             if (ret)
                 goto err;
         };
-        taskdata->state = 1;
+        appdata->state = KOS_SLOT_STATE_SUSPENDED;
         change_task();
     };
 
diff --git a/drivers/include/linux/mutex.h b/drivers/include/linux/mutex.h
index ab93b892fa..a36ed74080 100644
--- a/drivers/include/linux/mutex.h
+++ b/drivers/include/linux/mutex.h
@@ -58,7 +58,7 @@ struct mutex {
  */
 struct mutex_waiter {
 	struct list_head	list;
-    	int                	*task;
+	void		*task;
 };
 
 
diff --git a/drivers/include/syscall.h b/drivers/include/syscall.h
index e4bacae742..50ae7d7ca8 100644
--- a/drivers/include/syscall.h
+++ b/drivers/include/syscall.h
@@ -3,21 +3,23 @@
 
 #include <ddk.h>
 
+#define ASSERT_CONCAT_(a, b) a##b
+#define ASSERT_CONCAT(a, b) ASSERT_CONCAT_(a, b)
+#define STATIC_ASSERT(e) enum { ASSERT_CONCAT(assert_line_, __LINE__) = 1/(!!(e)) }
+
 typedef u32 addr_t;
 typedef u32 count_t;
 
 #pragma pack(push, 1)
 
-typedef struct
-{
-  int width;
-  int height;
-  int bpp;
-  int freq;
-}videomode_t;
+typedef struct {
+    int width;
+    int height;
+    int bpp;
+    int freq;
+} videomode_t;
 
-struct kos32_pdev
-{
+struct kos32_pdev {
     struct kos32_pdev *prev;
     struct kos32_pdev *next;
     u32 devid;
@@ -28,6 +30,96 @@ struct kos32_pdev
     u32 owner;
 };
 
+// struct BOX in const.inc
+struct kos_wnd_box {
+    u32 left;
+    u32 top;
+    u32 width;
+    u32 height;
+};
+
+// struct DBG_REGS in const.inc
+struct kos_dbg_regs {
+    u32 dr0;
+    u32 dr1;
+    u32 dr2;
+    u32 dr3;
+    u32 dr7;
+};
+
+struct kos_lhead {
+  struct kos_lhead *prev;
+  struct kos_lhead *next;
+};
+
+enum KOS_SLOT_STATES {
+    KOS_SLOT_STATE_RUNNING = 0,
+    KOS_SLOT_STATE_SUSPENDED = 1,
+    KOS_SLOT_STATE_SUSPENDED_WAIT_EVENT = 2,
+    KOS_SLOT_STATE_NORMAL_TERM = 3,
+    KOS_SLOT_STATE_EXCEPT_TERM = 4,
+    KOS_SLOT_STATE_WAIT_EVENT = 5,
+    KOS_SLOT_STATE_FREE = 9
+};
+
+struct kos_appdata {
+    char app_name[16];
+    struct kos_lhead list;
+    u32 process;
+    u32 fpu_state;
+    u32 exc_handler;
+    u32 except_mask;
+    u32 pl0_stack;
+    u32 cursor;
+    u32 fd_ev;
+    u32 bk_ev;
+    u32 fd_obj;
+    u32 bk_obj;
+    u32 saved_esp;
+    u32 io_map[2];
+    u32 dbg_state;
+    char* cur_dir;
+    u32 wait_timeout;
+    u32 saved_esp0;
+    u32 wait_begin;
+    u32 wait_test;
+    u32 wait_param;
+    u32 tls_base;
+    u32 event_mask;
+    u32 tid;
+    u32 draw_bgr_x;
+    u32 draw_bgr_y;
+    u8  state;
+    u8  wnd_number;
+    u16 __reserved1;
+    u32 wnd_shape;
+    u32 wnd_shape_scale;
+    u32 __reserved2;
+    u32 counter_sum;
+    struct kos_wnd_box saved_box;
+    u32 ipc_start;
+    u32 ipc_size;
+    u32 occurred_events;
+    u32 debugger_slot;
+    u32 terminate_protection;
+    u8  keyboard_mode;
+    u8  captionEncoding;
+    u8  __reserved3[2];
+    char* exec_params;
+    u32 dbg_event_mem;
+    struct kos_dbg_regs dbg_regs;
+    char* wnd_caption;
+    struct kos_wnd_box wnd_clientbox;
+    u32 priority;
+    struct kos_lhead in_schedule;
+    u32 counter_add;
+    u32 cpu_usage;
+    u32 __reserved4;
+};
+
+#define KOS_APPDATA_SIZE 256
+STATIC_ASSERT(sizeof(struct kos_appdata) == KOS_APPDATA_SIZE);
+
 typedef struct {
     unsigned            p00;
     union{
@@ -47,7 +139,7 @@ typedef struct {
     };
     char                p20;
     const char         *p21;
-}ksys70_t;
+} ksys70_t;
 
 #pragma pack(pop)
 
@@ -133,6 +225,8 @@ u32 STDCALL PciWrite8 (u32 bus, u32 devfn, u32 reg,u8 val) __asm__("PciWrite8");
 u32 STDCALL PciWrite16(u32 bus, u32 devfn, u32 reg,u16 val)__asm__("PciWrite16");
 u32 STDCALL PciWrite32(u32 bus, u32 devfn, u32 reg,u32 val)__asm__("PciWrite32");
 
+struct kos_appdata* IMPORT GetCurrSlot(void) __asm__("GetCurrSlot");
+
 #define pciReadByte(tag, reg) \
         PciRead8(PCI_BUS_FROM_TAG(tag),PCI_DFN_FROM_TAG(tag),(reg))
 
@@ -534,7 +628,8 @@ static inline void *KernelZeroAlloc(unsigned long size)
 
 static inline int power_supply_is_system_supplied(void) { return -1; };
 
-static inline int FS_Service(ksys70_t *k, int* err){
+static inline int FS_Service(ksys70_t *k, int* err)
+{
     int status;
     __asm__ __volatile__(
      "call *__imp__FS_Service"