diff --git a/kernel/dev/vga_console.inc b/kernel/dev/vga_console.inc
index 28b0992..bba8992 100644
--- a/kernel/dev/vga_console.inc
+++ b/kernel/dev/vga_console.inc
@@ -16,3 +16,7 @@ vga_console_clear:
 	rep stosb
 	ret
 
+vga_console_putc:
+	
+	ret
+
diff --git a/kernel/fs/fat.inc b/kernel/fs/fat.inc
new file mode 100644
index 0000000..265b401
--- /dev/null
+++ b/kernel/fs/fat.inc
@@ -0,0 +1 @@
+	;; File: fat.inc
diff --git a/kernel/fs/stpdfs.inc b/kernel/fs/stpdfs.inc
new file mode 100644
index 0000000..23fcd11
--- /dev/null
+++ b/kernel/fs/stpdfs.inc
@@ -0,0 +1,5 @@
+	;; File: stpdfs.inc
+
+STPDFS_SB_MAGIC = 0x44505453
+STPDFS_SB_REV = 1
+
diff --git a/kernel/gdt.inc b/kernel/gdt.inc
index c798514..b68ad50 100644
--- a/kernel/gdt.inc
+++ b/kernel/gdt.inc
@@ -21,9 +21,9 @@ gdt:
 	db 0x00, 0xF2, 0xCF, 0x00
 
 	; Tss
-;.tss:
-;	dw ?
-;	dd ?
+.tss:
+	dw ?
+	dd ?
 
 .end:
 	
diff --git a/kernel/irq.inc b/kernel/irq.inc
new file mode 100644
index 0000000..03c007e
--- /dev/null
+++ b/kernel/irq.inc
@@ -0,0 +1,3 @@
+irq_timer:
+	iret 
+
diff --git a/kernel/isr.inc b/kernel/isr.inc
index 3fb21e6..ddf3f08 100644
--- a/kernel/isr.inc
+++ b/kernel/isr.inc
@@ -26,6 +26,15 @@ idt_setup:
 	cmp ecx, 32
 	jb @b
 
+	mov ecx, 0x42
+	mov eax, isr_syscall
+	mov [aInterruptGate + (ecx * 8)], ax
+	mov [aInterruptGate + (ecx * 8) + 2], word 0x08
+
+	mov [aInterruptGate + (ecx * 8) + 5], word 0x8E
+	shr eax, 16
+	mov [aInterruptGate + (ecx * 8) + 6], ax
+
 	lidt [pIDT]
 	sti
 	ret
diff --git a/kernel/kernel.asm b/kernel/kernel.asm
index f48549d..30b08e4 100644
--- a/kernel/kernel.asm
+++ b/kernel/kernel.asm
@@ -2,6 +2,8 @@
 	format binary
 
 	include 'const.inc'
+	include 'sys/bootinfo.inc'
+	include 'sys/cpu.inc'
 
 	org KBASE
 	use32
@@ -52,15 +54,16 @@ kmain:
 	add ebx, KERNEL_VIRT_BASE
 	call pmm_free_range
 
+	call pic_init
+
 	; load kernel gdt 
 	lgdt [pGDT]
 	; I don't think i need to reload segment cuz their value are already correct
 
-	xchg bx, bx
-	call pic_disable
 
 	call idt_setup
 
+	int 0x42
 
 .halt:
 	hlt
@@ -71,20 +74,23 @@ kmain:
 	call klog
 	jmp .halt
 
-	include 'sys/bootinfo.inc'
 	include 'klog.inc'
 	include 'dev/vga_console.inc'
 	include 'mm/mm.inc'
 	include 'lock.inc'
 	include 'gdt.inc'
+	include 'syscall.inc'
 	include 'isr.inc'
 	include 'pic.inc'
 
+
 szMsgKernelAlive db "Kernel is alive", 0
 szErrorBootProtocol db "Error: wrong magic number", 0
 
 boot_structure BootInfo
 
+kTSS TSS
+
 	align 4096
 stack_bottom:
 	rb 0x4000
diff --git a/kernel/pic.inc b/kernel/pic.inc
index 2e75469..fcaae5d 100644
--- a/kernel/pic.inc
+++ b/kernel/pic.inc
@@ -6,10 +6,47 @@ PIC1_DATA    = 0x21
 PIC2_COMMAND = 0xA0
 PIC2_DATA    = 0xA1
 
+PIC_ICW1      = 0x10
+PIC_ICW1_IC4  = 0x01
+PIC_ICW1_SNGL = 0x02  
+PIC_ICW1_ADI  = 0x04
+PIC_ICW1_LTIM = 0x08
+
+PIC_ICW4_8086 = 0x01
+PIC_ICW4_AEOI = 0x02
+PIC_ICW4_MSTR = 0x04
+PIC_ICW4_BUF  = 0x08
+PIC_ICW4_SFNM = 0x10
+
 PIC_EOI = 0x20
 
 
 pic_init:
+	; ICW 1
+	mov al, PIC_ICW1 or PIC_ICW1_IC4
+	out PIC1_COMMAND, al
+	out PIC2_COMMAND, al
+
+	; ICW 2
+	mov al, 0x20
+	out PIC1_DATA, al
+	mov al, 0x28
+	out PIC2_DATA, al
+
+	; ICW 3
+	mov al, 0x4
+	out PIC1_DATA, al
+	mov al, 0x2
+	out PIC2_DATA, al
+
+	; ICW 4
+	mov al, PIC_ICW4_8086
+	out PIC1_DATA, al
+	out PIC2_DATA, al
+
+	xor al, al
+	out PIC1_DATA, al
+	out PIC2_DATA, al
 
 	ret
 
diff --git a/kernel/sys/cpu.inc b/kernel/sys/cpu.inc
index cd390b2..e11de06 100644
--- a/kernel/sys/cpu.inc
+++ b/kernel/sys/cpu.inc
@@ -88,21 +88,24 @@ struc TSS {
 	.iomap    dw ?
 }
 
-	;; Structure: idt_gate
+struc GDTGate {
+	
+}
+
+	;; Structure: IDTGate
 	;; .offset_low  - TODO
 	;; .selector    - TODO
 	;; .zero        - TODO
 	;; .attributes  - TODO
 	;; .offset_high - TODO
 	;;
-struc idt_gate
-	.offset_low:  resw 1
-	.selector:    resw 1
-	.zero:        resb 1
-	.attributes:  resb 1
-	.offset_high: resw 1
-endstruc
-defn idt_gate
+struc IDTGate {
+	.offset_low  dw ?
+	.selector    dw ?
+	.zero        db 0
+	.attributes  db ?
+	.offset_high dw ?
+}
 
 	;; About: Gates
 	;; - Task Gate
@@ -130,31 +133,31 @@ defn idt_gate
 	;; > +--------------- |----------------+-----------------|-----------------+
 
 
-struc intframe
+struc intframe {
 	;; registers
-	.edi: resd 1
-	.esi: resd 1
-	.ebp: resd 1
-	.esp: resd 1
-	.ebx: resd 1
-	.edx: resd 1
-	.ecx: resd 1
-	.eax: resd 1
+	.edi dd ?
+	.esi dd ?
+	.ebp dd ?
+	.esp dd ?
+	.ebx dd ?
+	.edx dd ?
+	.ecx dd ?
+	.eax dd ?
 
 	;;
-	.gs:    resd 1
-	.fs:    resd 1
-	.es:    resd 1
-	.ds:    resd 1
-	.intno: resd 1
+	.gs    dd ?
+	.fs    dd ?
+	.es    dd ?
+	.ds    dd ?
+	.intno dd ?
 
 	;; by x86 hardware
-	.err:    resd 1
-	.eip:    resd 1
-	.cs:     resd 1
-	.eflags: resd 1
+	.err     dd ?
+	.eip     dd ?
+	.cs      dd ?
+	.eflags  dd ?
 
 	;; crossring
-	.useresp: resd 1
-	.ss:      resd 1
-endstruc
+	.useresp  dd ?
+	.ss       dd ?
+}
diff --git a/kernel/syscall.inc b/kernel/syscall.inc
new file mode 100644
index 0000000..d4ad6a0
--- /dev/null
+++ b/kernel/syscall.inc
@@ -0,0 +1,10 @@
+SYSCALL_EXIT = 0x01
+SYSCALL_FORK = 0x02
+
+isr_syscall:
+	push eax
+	mov esi, szMsgSyscall
+	call klog
+	iret
+
+szMsgSyscall db "syscall %x", 0