Clear interrupt stack in yield sycall

cpu/i386/gdt.c

@@ -70,6 +70,10 @@ void gdt_init() {
   ");
 }
 
+void tss_stack_reset() {
+  tss.esp0=int_stack_top+0xC0000000;
+}
+
 void set_entry(int i,uint32_t base,uint32_t limit,uint8_t access) {
   gdt[i].limit_low16=limit&0xFFFF;
   gdt[i].base_low16=base&0xFFFFF;

cpu/i386/gdt.h

@@ -2,5 +2,6 @@
 #define GDT_H
 
 void gdt_init();
+void tss_stack_reset();
 
 #endif

cpu/i386/isr.c

@@ -1,5 +1,6 @@
 #include "isr.h"
 #include "idt.h"
+#include "gdt.h"
 #include "ports.h"
 #include "../halt.h"
 #include "../drivers/vga.h"
@@ -166,6 +167,7 @@ void isr_handler(registers_t r) {
       break;
     case 80:
       if (r.eax==1) {
+        tss_stack_reset();
         tasking_yield();
       } else if (r.eax==2) {
         tasking_createTask((void*)r.ebx);