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>
diff --git a/arch/blackfin/mach-common/entry.S b/arch/blackfin/mach-common/entry.S
index ab278a7..2188f81 100644
--- a/arch/blackfin/mach-common/entry.S
+++ b/arch/blackfin/mach-common/entry.S
@@ -58,6 +58,14 @@
#include <asm/mach-common/context.S>
+#if defined(CONFIG_BFIN_SCRATCH_REG_RETN)
+# define EX_SCRATCH_REG RETN
+#elif defined(CONFIG_BFIN_SCRATCH_REG_RETE)
+# define EX_SCRATCH_REG RETE
+#else
+# define EX_SCRATCH_REG CYCLES
+#endif
+
#ifdef CONFIG_EXCPT_IRQ_SYSC_L1
.section .l1.text
#else
@@ -93,7 +101,7 @@
call __cplb_hdr;
DEBUG_START_HWTRACE(p5, r7)
RESTORE_ALL_SYS
- SP = RETN;
+ SP = EX_SCRATCH_REG;
rtx;
ENDPROC(_ex_icplb)
@@ -102,7 +110,7 @@
(R7:6,P5:4) = [sp++];
ASTAT = [sp++];
raise 15; /* invoked by TRAP #0, for sys call */
- sp = retn;
+ sp = EX_SCRATCH_REG;
rtx
ENDPROC(_ex_syscall)
@@ -145,7 +153,7 @@
#endif
(R7:6,P5:4) = [sp++];
ASTAT = [sp++];
- sp = retn;
+ sp = EX_SCRATCH_REG;
rtx;
ENDPROC(_ex_soft_bp)
@@ -204,7 +212,7 @@
DEBUG_START_HWTRACE(p5, r7)
(R7:6,P5:4) = [sp++];
ASTAT = [sp++];
- SP = RETN;
+ SP = EX_SCRATCH_REG;
raise 5;
rtx;
ENDPROC(_ex_trap_c)
@@ -279,7 +287,7 @@
* covered by a CPLB. Switch to an exception stack; use RETN as a
* scratch register (for want of a better option).
*/
- retn = sp;
+ EX_SCRATCH_REG = sp;
sp.l = _exception_stack_top;
sp.h = _exception_stack_top;
/* Try to deal with syscalls quickly. */
diff --git a/arch/blackfin/mach-common/interrupt.S b/arch/blackfin/mach-common/interrupt.S
index 1d5ba5e..c6b32fe 100644
--- a/arch/blackfin/mach-common/interrupt.S
+++ b/arch/blackfin/mach-common/interrupt.S
@@ -177,27 +177,15 @@
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)
diff --git a/arch/blackfin/mach-common/ints-priority-dc.c b/arch/blackfin/mach-common/ints-priority-dc.c
index 684d306..2db3546 100644
--- a/arch/blackfin/mach-common/ints-priority-dc.c
+++ b/arch/blackfin/mach-common/ints-priority-dc.c
@@ -362,7 +362,11 @@
{
SSYNC();
- bfin_write_EVT2(evt_evt2);
+ /* cannot program in software:
+ * evt0 - emulation (jtag)
+ * evt1 - reset
+ */
+ bfin_write_EVT2(evt_nmi);
bfin_write_EVT3(trap);
bfin_write_EVT5(evt_ivhw);
bfin_write_EVT6(evt_timer);
diff --git a/arch/blackfin/mach-common/ints-priority-sc.c b/arch/blackfin/mach-common/ints-priority-sc.c
index a2016af..d3b7672 100644
--- a/arch/blackfin/mach-common/ints-priority-sc.c
+++ b/arch/blackfin/mach-common/ints-priority-sc.c
@@ -721,7 +721,11 @@
{
SSYNC();
- bfin_write_EVT2(evt_evt2);
+ /* cannot program in software:
+ * evt0 - emulation (jtag)
+ * evt1 - reset
+ */
+ bfin_write_EVT2(evt_nmi);
bfin_write_EVT3(trap);
bfin_write_EVT5(evt_ivhw);
bfin_write_EVT6(evt_timer);
