1 files changed, 78 insertions, 0 deletions
diff --git a/arch/s390/include/asm/irqflags.h b/arch/s390/include/asm/irqflags.h
new file mode 100644
index 000000000..02427b205
--- /dev/null
+++ b/arch/s390/include/asm/irqflags.h
@@ -0,0 +1,78 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *    Copyright IBM Corp. 2006, 2010
+ *    Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
+ */
+
+#ifndef __ASM_IRQFLAGS_H
+#define __ASM_IRQFLAGS_H
+
+#include <linux/types.h>
+
+#define ARCH_IRQ_ENABLED	(3UL << (BITS_PER_LONG - 8))
+
+/* store then OR system mask. */
+#define __arch_local_irq_stosm(__or)					\
+({									\
+	unsigned long __mask;						\
+	asm volatile(							\
+		"	stosm	%0,%1"					\
+		: "=Q" (__mask) : "i" (__or) : "memory");		\
+	__mask;								\
+})
+
+/* store then AND system mask. */
+#define __arch_local_irq_stnsm(__and)					\
+({									\
+	unsigned long __mask;						\
+	asm volatile(							\
+		"	stnsm	%0,%1"					\
+		: "=Q" (__mask) : "i" (__and) : "memory");		\
+	__mask;								\
+})
+
+/* set system mask. */
+static __always_inline void __arch_local_irq_ssm(unsigned long flags)
+{
+	asm volatile("ssm   %0" : : "Q" (flags) : "memory");
+}
+
+static __always_inline unsigned long arch_local_save_flags(void)
+{
+	return __arch_local_irq_stnsm(0xff);
+}
+
+static __always_inline unsigned long arch_local_irq_save(void)
+{
+	return __arch_local_irq_stnsm(0xfc);
+}
+
+static __always_inline void arch_local_irq_disable(void)
+{
+	arch_local_irq_save();
+}
+
+static __always_inline void arch_local_irq_enable(void)
+{
+	__arch_local_irq_stosm(0x03);
+}
+
+/* This only restores external and I/O interrupt state */
+static __always_inline void arch_local_irq_restore(unsigned long flags)
+{
+	/* only disabled->disabled and disabled->enabled is valid */
+	if (flags & ARCH_IRQ_ENABLED)
+		arch_local_irq_enable();
+}
+
+static __always_inline bool arch_irqs_disabled_flags(unsigned long flags)
+{
+	return !(flags & ARCH_IRQ_ENABLED);
+}
+
+static __always_inline bool arch_irqs_disabled(void)
+{
+	return arch_irqs_disabled_flags(arch_local_save_flags());
+}
+
+#endif /* __ASM_IRQFLAGS_H */