--- linux/kernel/traps.c	2018/04/24 18:00:41	1.1
+++ linux/kernel/traps.c	2018/04/24 18:01:31	1.1.1.2
@@ -1,4 +1,10 @@
 /*
+ *  linux/kernel/traps.c
+ *
+ *  (C) 1991  Linus Torvalds
+ */
+
+/*
  * 'Traps.c' handles hardware traps and faults after we have saved some
  * state in 'asm.s'. Currently mostly a debugging-aid, will be extended
  * to mainly kill the offending process (probably by giving it a signal,
@@ -11,6 +17,7 @@
 #include <linux/kernel.h>
 #include <asm/system.h>
 #include <asm/segment.h>
+#include <asm/io.h>
 
 #define get_seg_byte(seg,addr) ({ \
 register char __res; \
@@ -50,6 +57,8 @@ void general_protection(void);
 void page_fault(void);
 void coprocessor_error(void);
 void reserved(void);
+void parallel_interrupt(void);
+void irq13(void);
 
 static void die(char * str,long esp_ptr,long nr)
 {
@@ -159,12 +168,14 @@ void do_stack_segment(long esp,long erro
 
 void do_coprocessor_error(long esp, long error_code)
 {
+	if (last_task_used_math != current)
+		return;
 	die("coprocessor error",esp,error_code);
 }
 
 void do_reserved(long esp, long error_code)
 {
-	die("reserved (15,17-31) error",esp,error_code);
+	die("reserved (15,17-47) error",esp,error_code);
 }
 
 void trap_init(void)
@@ -188,12 +199,10 @@ void trap_init(void)
 	set_trap_gate(14,&page_fault);
 	set_trap_gate(15,&reserved);
 	set_trap_gate(16,&coprocessor_error);
-	for (i=17;i<32;i++)
+	for (i=17;i<48;i++)
 		set_trap_gate(i,&reserved);
-/*	__asm__("movl $0x3ff000,%%eax\n\t"
-		"movl %%eax,%%db0\n\t"
-		"movl $0x000d0303,%%eax\n\t"
-		"movl %%eax,%%db7"
-		:::"ax");*/
+	set_trap_gate(45,&irq13);
+	outb_p(inb_p(0x21)&0xfb,0x21);
+	outb(inb_p(0xA1)&0xdf,0xA1);
+	set_trap_gate(39,&parallel_interrupt);
 }
-