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Diffstat (limited to 'arch/blackfin/include/asm/entry.h')
-rw-r--r--arch/blackfin/include/asm/entry.h92
1 files changed, 89 insertions, 3 deletions
diff --git a/arch/blackfin/include/asm/entry.h b/arch/blackfin/include/asm/entry.h
index b30a2968e274..ec58efc130e6 100644
--- a/arch/blackfin/include/asm/entry.h
+++ b/arch/blackfin/include/asm/entry.h
@@ -35,21 +35,39 @@
#else
# define LOAD_IPIPE_IPEND
#endif
+
+#ifndef CONFIG_EXACT_HWERR
+/* As a debugging aid - we save IPEND when DEBUG_KERNEL is on,
+ * otherwise it is a waste of cycles.
+ */
+# ifndef CONFIG_DEBUG_KERNEL
+#define INTERRUPT_ENTRY(N) \
+ [--sp] = SYSCFG; \
+ [--sp] = P0; /*orig_p0*/ \
+ [--sp] = R0; /*orig_r0*/ \
+ [--sp] = (R7:0,P5:0); \
+ R0 = (N); \
+ LOAD_IPIPE_IPEND \
+ jump __common_int_entry;
+# else /* CONFIG_DEBUG_KERNEL */
#define INTERRUPT_ENTRY(N) \
[--sp] = SYSCFG; \
- \
[--sp] = P0; /*orig_p0*/ \
[--sp] = R0; /*orig_r0*/ \
[--sp] = (R7:0,P5:0); \
+ p0.l = lo(IPEND); \
+ p0.h = hi(IPEND); \
+ r1 = [p0]; \
R0 = (N); \
LOAD_IPIPE_IPEND \
jump __common_int_entry;
+# endif /* CONFIG_DEBUG_KERNEL */
/* For timer interrupts, we need to save IPEND, since the user_mode
- macro accesses it to determine where to account time. */
+ *macro accesses it to determine where to account time.
+ */
#define TIMER_INTERRUPT_ENTRY(N) \
[--sp] = SYSCFG; \
- \
[--sp] = P0; /*orig_p0*/ \
[--sp] = R0; /*orig_r0*/ \
[--sp] = (R7:0,P5:0); \
@@ -58,6 +76,74 @@
r1 = [p0]; \
R0 = (N); \
jump __common_int_entry;
+#else /* CONFIG_EXACT_HWERR is defined */
+
+/* if we want hardware error to be exact, we need to do a SSYNC (which forces
+ * read/writes to complete to the memory controllers), and check to see that
+ * caused a pending HW error condition. If so, we assume it was caused by user
+ * space, by setting the same interrupt that we are in (so it goes off again)
+ * and context restore, and a RTI (without servicing anything). This should
+ * cause the pending HWERR to fire, and when that is done, this interrupt will
+ * be re-serviced properly.
+ * As you can see by the code - we actually need to do two SSYNCS - one to
+ * make sure the read/writes complete, and another to make sure the hardware
+ * error is recognized by the core.
+ */
+#define INTERRUPT_ENTRY(N) \
+ SSYNC; \
+ SSYNC; \
+ [--sp] = SYSCFG; \
+ [--sp] = P0; /*orig_p0*/ \
+ [--sp] = R0; /*orig_r0*/ \
+ [--sp] = (R7:0,P5:0); \
+ R1 = ASTAT; \
+ P0.L = LO(ILAT); \
+ P0.H = HI(ILAT); \
+ R0 = [P0]; \
+ CC = BITTST(R0, EVT_IVHW_P); \
+ IF CC JUMP 1f; \
+ ASTAT = R1; \
+ p0.l = lo(IPEND); \
+ p0.h = hi(IPEND); \
+ r1 = [p0]; \
+ R0 = (N); \
+ LOAD_IPIPE_IPEND \
+ jump __common_int_entry; \
+1: ASTAT = R1; \
+ RAISE N; \
+ (R7:0, P5:0) = [SP++]; \
+ SP += 0x8; \
+ SYSCFG = [SP++]; \
+ CSYNC; \
+ RTI;
+
+#define TIMER_INTERRUPT_ENTRY(N) \
+ SSYNC; \
+ SSYNC; \
+ [--sp] = SYSCFG; \
+ [--sp] = P0; /*orig_p0*/ \
+ [--sp] = R0; /*orig_r0*/ \
+ [--sp] = (R7:0,P5:0); \
+ R1 = ASTAT; \
+ P0.L = LO(ILAT); \
+ P0.H = HI(ILAT); \
+ R0 = [P0]; \
+ CC = BITTST(R0, EVT_IVHW_P); \
+ IF CC JUMP 1f; \
+ ASTAT = R1; \
+ p0.l = lo(IPEND); \
+ p0.h = hi(IPEND); \
+ r1 = [p0]; \
+ R0 = (N); \
+ jump __common_int_entry; \
+1: ASTAT = R1; \
+ RAISE N; \
+ (R7:0, P5:0) = [SP++]; \
+ SP += 0x8; \
+ SYSCFG = [SP++]; \
+ CSYNC; \
+ RTI;
+#endif /* CONFIG_EXACT_HWERR */
/* This one pushes RETI without using CLI. Interrupts are enabled. */
#define SAVE_CONTEXT_SYSCALL save_context_syscall
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