Merge branch 'master' into csb1725

[mv-sheeva.git] / arch / ia64 / include / asm / irqflags.h

diff --git a/arch/ia64/include/asm/irqflags.h b/arch/ia64/include/asm/irqflags.h
new file mode 100644 (file)
index 0000000..f82d6be
--- /dev/null
+++ b/arch/ia64/include/asm/irqflags.h
@@ -0,0 +1,94 @@
+/*
+ * IRQ flags defines.
+ *
+ * Copyright (C) 1998-2003 Hewlett-Packard Co
+ *     David Mosberger-Tang <davidm@hpl.hp.com>
+ * Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
+ * Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
+ */
+
+#ifndef _ASM_IA64_IRQFLAGS_H
+#define _ASM_IA64_IRQFLAGS_H
+
+#ifdef CONFIG_IA64_DEBUG_IRQ
+extern unsigned long last_cli_ip;
+static inline void arch_maybe_save_ip(unsigned long flags)
+{
+       if (flags & IA64_PSR_I)
+               last_cli_ip = ia64_getreg(_IA64_REG_IP);
+}
+#else
+#define arch_maybe_save_ip(flags) do {} while (0)
+#endif
+
+/*
+ * - clearing psr.i is implicitly serialized (visible by next insn)
+ * - setting psr.i requires data serialization
+ * - we need a stop-bit before reading PSR because we sometimes
+ *   write a floating-point register right before reading the PSR
+ *   and that writes to PSR.mfl
+ */
+
+static inline unsigned long arch_local_save_flags(void)
+{
+       ia64_stop();
+#ifdef CONFIG_PARAVIRT
+       return ia64_get_psr_i();
+#else
+       return ia64_getreg(_IA64_REG_PSR);
+#endif
+}
+
+static inline unsigned long arch_local_irq_save(void)
+{
+       unsigned long flags = arch_local_save_flags();
+
+       ia64_stop();
+       ia64_rsm(IA64_PSR_I);
+       arch_maybe_save_ip(flags);
+       return flags;
+}
+
+static inline void arch_local_irq_disable(void)
+{
+#ifdef CONFIG_IA64_DEBUG_IRQ
+       arch_local_irq_save();
+#else
+       ia64_stop();
+       ia64_rsm(IA64_PSR_I);
+#endif
+}
+
+static inline void arch_local_irq_enable(void)
+{
+       ia64_stop();
+       ia64_ssm(IA64_PSR_I);
+       ia64_srlz_d();
+}
+
+static inline void arch_local_irq_restore(unsigned long flags)
+{
+#ifdef CONFIG_IA64_DEBUG_IRQ
+       unsigned long old_psr = arch_local_save_flags();
+#endif
+       ia64_intrin_local_irq_restore(flags & IA64_PSR_I);
+       arch_maybe_save_ip(old_psr & ~flags);
+}
+
+static inline bool arch_irqs_disabled_flags(unsigned long flags)
+{
+       return (flags & IA64_PSR_I) == 0;
+}
+
+static inline bool arch_irqs_disabled(void)
+{
+       return arch_irqs_disabled_flags(arch_local_save_flags());
+}
+
+static inline void arch_safe_halt(void)
+{
+       ia64_pal_halt_light();  /* PAL_HALT_LIGHT */
+}
+
+
+#endif /* _ASM_IA64_IRQFLAGS_H */