Moved generic (triple fault) reset code

Moved from interrupts.c to cpu.c and made into a weak function to
allow vendor specific override

Vendor specific CPU reset (like the AMD SC520 MMCR reset) can now be
added to the vendor specific code without the need to remember to
#undef usage of the generic method and if you forget to include your
custom reset method, you will always get the default.

Signed-off-by: Graeme Russ <graeme.russ@gmail.com>

cpu/i386/cpu.c

@@ -35,6 +35,7 @@
 
 #include <common.h>
 #include <command.h>
+#include <asm/interrupt.h>
 
 int cpu_init(void)
 {
@@ -64,3 +65,19 @@ void  flush_cache (unsigned long dummy1, unsigned long dummy2)
 	asm("wbinvd\n");
 	return;
 }
+
+void __attribute__ ((regparm(0))) generate_gpf(void);
+
+/* segment 0x70 is an arbitrary segment which does not exist */
+asm(".globl generate_gpf\n"
+    "generate_gpf:\n"
+    "ljmp   $0x70, $0x47114711\n");
+
+void __reset_cpu(ulong addr)
+{
+	printf("Resetting using i386 Triple Fault\n");
+	set_vector(13, generate_gpf);  /* general protection fault handler */
+	set_vector(8, generate_gpf);   /* double fault handler */
+	generate_gpf();                /* start the show */
+}
+void reset_cpu(ulong addr) __attribute__((weak, alias("__reset_cpu")));

cpu/i386/interrupts.c

@@ -508,19 +508,3 @@ int disable_interrupts(void)
 
 	return (flags&0x200); /* IE flags is bit 9 */
 }
-
-
-#ifdef CONFIG_SYS_RESET_GENERIC
-
-void __attribute__ ((regparm(0))) generate_gpf(void);
-asm(".globl generate_gpf\n"
-    "generate_gpf:\n"
-    "ljmp   $0x70, $0x47114711\n"); /* segment 0x70 is an arbitrary segment which does not
-				    * exist */
-void reset_cpu(ulong addr)
-{
-	set_vector(13, generate_gpf);  /* general protection fault handler */
-	set_vector(8, generate_gpf);   /* double fault handler */
-	generate_gpf();                /* start the show */
-}
-#endif