Initial import

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