This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / include / asm-x86_64 / irqflags.h

diff --git a/include/asm-x86_64/irqflags.h b/include/asm-x86_64/irqflags.h
new file mode 100644 (file)
index 0000000..cce6937
--- /dev/null
+++ b/include/asm-x86_64/irqflags.h
@@ -0,0 +1,141 @@
+/*
+ * include/asm-x86_64/irqflags.h
+ *
+ * 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__
+/*
+ * Interrupt control:
+ */
+
+static inline unsigned long __raw_local_save_flags(void)
+{
+       unsigned long flags;
+
+       __asm__ __volatile__(
+               "# __raw_save_flags\n\t"
+               "pushfq ; popq %q0"
+               : "=g" (flags)
+               : /* no input */
+               : "memory"
+       );
+
+       return flags;
+}
+
+#define raw_local_save_flags(flags) \
+               do { (flags) = __raw_local_save_flags(); } while (0)
+
+static inline void raw_local_irq_restore(unsigned long flags)
+{
+       __asm__ __volatile__(
+               "pushq %0 ; popfq"
+               : /* no output */
+               :"g" (flags)
+               :"memory", "cc"
+       );
+}
+
+#ifdef CONFIG_X86_VSMP
+
+/*
+ * Interrupt control for the VSMP architecture:
+ */
+
+static inline void raw_local_irq_disable(void)
+{
+       unsigned long flags = __raw_local_save_flags();
+
+       raw_local_irq_restore((flags & ~(1 << 9)) | (1 << 18));
+}
+
+static inline void raw_local_irq_enable(void)
+{
+       unsigned long flags = __raw_local_save_flags();
+
+       raw_local_irq_restore((flags | (1 << 9)) & ~(1 << 18));
+}
+
+static inline int raw_irqs_disabled_flags(unsigned long flags)
+{
+       return !(flags & (1<<9)) || (flags & (1 << 18));
+}
+
+#else /* CONFIG_X86_VSMP */
+
+static inline void raw_local_irq_disable(void)
+{
+       __asm__ __volatile__("cli" : : : "memory");
+}
+
+static inline void raw_local_irq_enable(void)
+{
+       __asm__ __volatile__("sti" : : : "memory");
+}
+
+static inline int raw_irqs_disabled_flags(unsigned long flags)
+{
+       return !(flags & (1 << 9));
+}
+
+#endif
+
+/*
+ * For spinlocks, etc.:
+ */
+
+static inline unsigned long __raw_local_irq_save(void)
+{
+       unsigned long flags = __raw_local_save_flags();
+
+       raw_local_irq_disable();
+
+       return flags;
+}
+
+#define raw_local_irq_save(flags) \
+               do { (flags) = __raw_local_irq_save(); } while (0)
+
+static inline int raw_irqs_disabled(void)
+{
+       unsigned long flags = __raw_local_save_flags();
+
+       return raw_irqs_disabled_flags(flags);
+}
+
+/*
+ * Used in the idle loop; sti takes one instruction cycle
+ * to complete:
+ */
+static inline void raw_safe_halt(void)
+{
+       __asm__ __volatile__("sti; hlt" : : : "memory");
+}
+
+/*
+ * Used when interrupts are already enabled or to
+ * shutdown the processor:
+ */
+static inline void halt(void)
+{
+       __asm__ __volatile__("hlt": : :"memory");
+}
+
+#else /* __ASSEMBLY__: */
+# ifdef CONFIG_TRACE_IRQFLAGS
+#  define TRACE_IRQS_ON                call trace_hardirqs_on_thunk
+#  define TRACE_IRQS_OFF       call trace_hardirqs_off_thunk
+# else
+#  define TRACE_IRQS_ON
+#  define TRACE_IRQS_OFF
+# endif
+#endif
+
+#endif