Use vectors for irq and nmi

sw/kernel/devices/interrupt_controller.s

@@ -9,6 +9,8 @@
 .export _disable_irq
 .export _send_eoi
 
+.import irq_int, nmi_int
+
 IRQ_CMD_ADDR    = $effc
 IRQ_DAT_ADDR    = $effd
 
@@ -19,11 +21,24 @@ IRQ_CMD_ENABLE  = $20
 IRQ_CMD_TYPE    = $40
 IRQ_CMD_EOI     = $ff
 
+IRQ_VECTOR = $220
+NMI_VECTOR = $222
+
 .code
 
 ; void init_irq();
 ; mask all IRQs, set all type to edge.
 .proc _init_interrupt_controller
+    lda #<irq_int
+    sta IRQ_VECTOR
+    lda #>irq_int
+    sta IRQ_VECTOR+1
+
+    lda #<nmi_int
+    sta NMI_VECTOR
+    lda #>nmi_int
+    sta NMI_VECTOR+1
+
     ldx #$20    ; enable
     ldy #00
     jsr cmd_all

sw/kernel/interrupts/interrupt.h

@@ -6,9 +6,6 @@
 #define BUTTON  (1 << 0)
 #define UART    (1 << 1)
 
-void irq_int();
-void nmi_int();
-
 void register_irq(void* addr, uint8_t irqn);
 
 uint8_t irq_get_status();

sw/kernel/interrupts/interrupt.s

@@ -4,7 +4,7 @@
 
 .import _enable_irq
 
-.export   _irq_int, _nmi_int
+.export   irq_int, nmi_int
 .export _register_irq
 
 IRQ_CMD_ADDR    = $effc
@@ -12,13 +12,14 @@ IRQ_DAT_ADDR    = $effd
 
 IRQ_CMD_READIRQ = $00
 
-.proc _nmi_int
+
+.proc nmi_int
 rti
 .endproc
 
 
-; _irq_int
-.proc _irq_int
+; irq_int
+.proc irq_int
     ; Load IRQ number
     lda #IRQ_CMD_READIRQ
     sta IRQ_CMD_ADDR