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

[linux-2.6.git] / include / asm-i386 / irqflags.h

diff --git a/include/asm-i386/irqflags.h b/include/asm-i386/irqflags.h
new file mode 100644 (file)
index 0000000..e1bdb97
--- /dev/null
+++ b/include/asm-i386/irqflags.h
@@ -0,0 +1,127 @@
+/*
+ * include/asm-i386/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__
+
+static inline unsigned long __raw_local_save_flags(void)
+{
+       unsigned long flags;
+
+       __asm__ __volatile__(
+               "pushfl ; popl %0"
+               : "=g" (flags)
+               : /* no input */
+       );
+
+       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__(
+               "pushl %0 ; popfl"
+               : /* no output */
+               :"g" (flags)
+               :"memory", "cc"
+       );
+}
+
+static inline void raw_local_irq_disable(void)
+{
+       __asm__ __volatile__("cli" : : : "memory");
+}
+
+static inline void raw_local_irq_enable(void)
+{
+       __asm__ __volatile__("sti" : : : "memory");
+}
+
+/*
+ * 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");
+}
+
+static inline int raw_irqs_disabled_flags(unsigned long flags)
+{
+       return !(flags & (1 << 9));
+}
+
+static inline int raw_irqs_disabled(void)
+{
+       unsigned long flags = __raw_local_save_flags();
+
+       return raw_irqs_disabled_flags(flags);
+}
+
+/*
+ * 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)
+
+#endif /* __ASSEMBLY__ */
+
+/*
+ * Do the CPU's IRQ-state tracing from assembly code. We call a
+ * C function, so save all the C-clobbered registers:
+ */
+#ifdef CONFIG_TRACE_IRQFLAGS
+
+# define TRACE_IRQS_ON                         \
+       pushl %eax;                             \
+       pushl %ecx;                             \
+       pushl %edx;                             \
+       call trace_hardirqs_on;                 \
+       popl %edx;                              \
+       popl %ecx;                              \
+       popl %eax;
+
+# define TRACE_IRQS_OFF                                \
+       pushl %eax;                             \
+       pushl %ecx;                             \
+       pushl %edx;                             \
+       call trace_hardirqs_off;                \
+       popl %edx;                              \
+       popl %ecx;                              \
+       popl %eax;
+
+#else
+# define TRACE_IRQS_ON
+# define TRACE_IRQS_OFF
+#endif
+
+#endif