Blackfin arch: allow people to select the feature that is unavailable to the kernel

 - allow people to select the feature that is unavailable to the kernel: NMI, JTAG, or CYCLES.
 - change default NMI handler to simply dump hardware trace buffer.
 - remove default NMI handler completely as calling into kernel code is not safe
   move example handler to wiki so people dont haphazardly copy and paste this stuff thinking its safe

Signed-off-by: Mike Frysinger <michael.frysinger@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>

1 files changed, 8 insertions, 20 deletions

diff --git a/arch/blackfin/mach-common/interrupt.S b/arch/blackfin/mach-common/interrupt.S
index 1d5ba5e3d91c..c6b32fe0f6e9 100644
--- a/arch/blackfin/mach-common/interrupt.S
+++ b/arch/blackfin/mach-common/interrupt.S
@@ -177,27 +177,15 @@ ENTRY(_evt_ivhw)
         jump .Lcommon_restore_context;
 #endif
 
-/* interrupt routine for evt2 - 2.  This is NMI.  */
-ENTRY(_evt_evt2)
-        SAVE_CONTEXT
-#ifdef CONFIG_FRAME_POINTER
-        fp = 0;
-#endif
-#if ANOMALY_05000283
-        cc = r7 == r7;
-        p5.h = 0xffc0;
-        p5.l = 0x0014;
-        if cc jump 1f;
-        r7.l = W[p5];
-1:
-#endif
-        r0 = IRQ_NMI;
-        r1 =  sp;
-        SP += -12;
-        call _asm_do_IRQ;
-        SP += 12;
-        RESTORE_CONTEXT
+/* Interrupt routine for evt2 (NMI).
+ * We don't actually use this, so just return.
+ * For inner circle type details, please see:
+ * http://docs.blackfin.uclinux.org/doku.php?id=linux:nmi
+ */
+ENTRY(_evt_nmi)
+.weak _evt_nmi
         rtn;
+ENDPROC(_evt_nmi)
 
 /* interrupt routine for core timer - 6 */
 ENTRY(_evt_timer)