Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / metag / include / asm / irqflags.h

diff --git a/kernel/arch/metag/include/asm/irqflags.h b/kernel/arch/metag/include/asm/irqflags.h
new file mode 100644 (file)
index 0000000..339b16f
--- /dev/null
+++ b/kernel/arch/metag/include/asm/irqflags.h
@@ -0,0 +1,93 @@
+/*
+ * IRQ flags handling
+ *
+ * This file gets included from lowlevel asm headers too, to provide
+ * wrapped versions of the local_irq_*() APIs, based on the
+ * raw_local_irq_*() functions from the lowlevel headers.
+ */
+#ifndef _ASM_IRQFLAGS_H
+#define _ASM_IRQFLAGS_H
+
+#ifndef __ASSEMBLY__
+
+#include <asm/core_reg.h>
+#include <asm/metag_regs.h>
+
+#define INTS_OFF_MASK TXSTATI_BGNDHALT_BIT
+
+#ifdef CONFIG_SMP
+extern unsigned int get_trigger_mask(void);
+#else
+
+extern unsigned int global_trigger_mask;
+
+static inline unsigned int get_trigger_mask(void)
+{
+       return global_trigger_mask;
+}
+#endif
+
+static inline unsigned long arch_local_save_flags(void)
+{
+       return __core_reg_get(TXMASKI);
+}
+
+static inline int arch_irqs_disabled_flags(unsigned long flags)
+{
+       return (flags & ~INTS_OFF_MASK) == 0;
+}
+
+static inline int arch_irqs_disabled(void)
+{
+       unsigned long flags = arch_local_save_flags();
+
+       return arch_irqs_disabled_flags(flags);
+}
+
+static inline unsigned long __irqs_disabled(void)
+{
+       /*
+        * We shouldn't enable exceptions if they are not already
+        * enabled. This is required for chancalls to work correctly.
+        */
+       return arch_local_save_flags() & INTS_OFF_MASK;
+}
+
+/*
+ * For spinlocks, etc:
+ */
+static inline unsigned long arch_local_irq_save(void)
+{
+       unsigned long flags = __irqs_disabled();
+
+       asm volatile("SWAP %0,TXMASKI\n" : "=r" (flags) : "0" (flags)
+                    : "memory");
+
+       return flags;
+}
+
+static inline void arch_local_irq_restore(unsigned long flags)
+{
+       asm volatile("MOV TXMASKI,%0\n" : : "r" (flags) : "memory");
+}
+
+static inline void arch_local_irq_disable(void)
+{
+       unsigned long flags = __irqs_disabled();
+
+       asm volatile("MOV TXMASKI,%0\n" : : "r" (flags) : "memory");
+}
+
+#ifdef CONFIG_SMP
+/* Avoid circular include dependencies through <linux/preempt.h> */
+void arch_local_irq_enable(void);
+#else
+static inline void arch_local_irq_enable(void)
+{
+       arch_local_irq_restore(get_trigger_mask());
+}
+#endif
+
+#endif /* (__ASSEMBLY__) */
+
+#endif /* !(_ASM_IRQFLAGS_H) */