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Diffstat (limited to 'arch/powerpc/include/asm/irqflags.h')
-rw-r--r--arch/powerpc/include/asm/irqflags.h73
1 files changed, 73 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/irqflags.h b/arch/powerpc/include/asm/irqflags.h
new file mode 100644
index 000000000..f2149066f
--- /dev/null
+++ b/arch/powerpc/include/asm/irqflags.h
@@ -0,0 +1,73 @@
+/*
+ * IRQ flags handling
+ */
+#ifndef _ASM_IRQFLAGS_H
+#define _ASM_IRQFLAGS_H
+
+#ifndef __ASSEMBLY__
+/*
+ * Get definitions for arch_local_save_flags(x), etc.
+ */
+#include <asm/hw_irq.h>
+
+#else
+#ifdef CONFIG_TRACE_IRQFLAGS
+#ifdef CONFIG_IRQSOFF_TRACER
+/*
+ * Since the ftrace irqsoff latency trace checks CALLER_ADDR1,
+ * which is the stack frame here, we need to force a stack frame
+ * in case we came from user space.
+ */
+#define TRACE_WITH_FRAME_BUFFER(func) \
+ mflr r0; \
+ stdu r1, -STACK_FRAME_OVERHEAD(r1); \
+ std r0, 16(r1); \
+ stdu r1, -STACK_FRAME_OVERHEAD(r1); \
+ bl func; \
+ ld r1, 0(r1); \
+ ld r1, 0(r1);
+#else
+#define TRACE_WITH_FRAME_BUFFER(func) \
+ bl func;
+#endif
+
+/*
+ * These are calls to C code, so the caller must be prepared for volatiles to
+ * be clobbered.
+ */
+#define TRACE_ENABLE_INTS TRACE_WITH_FRAME_BUFFER(trace_hardirqs_on)
+#define TRACE_DISABLE_INTS TRACE_WITH_FRAME_BUFFER(trace_hardirqs_off)
+
+/*
+ * This is used by assembly code to soft-disable interrupts first and
+ * reconcile irq state.
+ *
+ * NB: This may call C code, so the caller must be prepared for volatiles to
+ * be clobbered.
+ */
+#define RECONCILE_IRQ_STATE(__rA, __rB) \
+ lbz __rA,PACASOFTIRQEN(r13); \
+ lbz __rB,PACAIRQHAPPENED(r13); \
+ cmpwi cr0,__rA,0; \
+ li __rA,0; \
+ ori __rB,__rB,PACA_IRQ_HARD_DIS; \
+ stb __rB,PACAIRQHAPPENED(r13); \
+ beq 44f; \
+ stb __rA,PACASOFTIRQEN(r13); \
+ TRACE_DISABLE_INTS; \
+44:
+
+#else
+#define TRACE_ENABLE_INTS
+#define TRACE_DISABLE_INTS
+
+#define RECONCILE_IRQ_STATE(__rA, __rB) \
+ lbz __rA,PACAIRQHAPPENED(r13); \
+ li __rB,0; \
+ ori __rA,__rA,PACA_IRQ_HARD_DIS; \
+ stb __rB,PACASOFTIRQEN(r13); \
+ stb __rA,PACAIRQHAPPENED(r13)
+#endif
+#endif
+
+#endif