Merge branch 'x86/um-header' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'x86/um-header' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (26 commits)
  x86: canonicalize remaining header guards
  x86: drop double underscores from header guards
  x86: Fix ASM_X86__ header guards
  x86, um: get rid of uml-config.h
  x86, um: get rid of arch/um/Kconfig.arch
  x86, um: get rid of arch/um/os symlink
  x86, um: get rid of excessive includes of uml-config.h
  x86, um: get rid of header symlinks
  x86, um: merge Kconfig.i386 and Kconfig.x86_64
  x86, um: get rid of sysdep symlink
  x86, um: trim the junk from uml ptrace-*.h
  x86, um: take vm-flags.h to sysdep
  x86, um: get rid of uml asm/arch
  x86, um: get rid of uml highmem.h
  x86, um: get rid of uml unistd.h
  x86, um: get rid of system.h -> system.h include
  x86, um: uml atomic.h is not needed anymore
  x86, um: untangle uml ldt.h
  x86, um: get rid of more uml asm/arch uses
  x86, um: remove dead header (uml module-generic.h; never used these days)
  ...

1 files changed, 62 insertions, 0 deletions

diff --git a/arch/x86/include/asm/tsc.h b/arch/x86/include/asm/tsc.h
new file mode 100644
index 0000000..38ae163
--- /dev/null
+++ b/arch/x86/include/asm/tsc.h
@@ -0,0 +1,62 @@
+/*
+ * x86 TSC related functions
+ */
+#ifndef _ASM_X86_TSC_H
+#define _ASM_X86_TSC_H
+
+#include <asm/processor.h>
+
+#define NS_SCALE	10 /* 2^10, carefully chosen */
+#define US_SCALE	32 /* 2^32, arbitralrily chosen */
+
+/*
+ * Standard way to access the cycle counter.
+ */
+typedef unsigned long long cycles_t;
+
+extern unsigned int cpu_khz;
+extern unsigned int tsc_khz;
+
+extern void disable_TSC(void);
+
+static inline cycles_t get_cycles(void)
+{
+	unsigned long long ret = 0;
+
+#ifndef CONFIG_X86_TSC
+	if (!cpu_has_tsc)
+		return 0;
+#endif
+	rdtscll(ret);
+
+	return ret;
+}
+
+static __always_inline cycles_t vget_cycles(void)
+{
+	/*
+	 * We only do VDSOs on TSC capable CPUs, so this shouldnt
+	 * access boot_cpu_data (which is not VDSO-safe):
+	 */
+#ifndef CONFIG_X86_TSC
+	if (!cpu_has_tsc)
+		return 0;
+#endif
+	return (cycles_t)__native_read_tsc();
+}
+
+extern void tsc_init(void);
+extern void mark_tsc_unstable(char *reason);
+extern int unsynchronized_tsc(void);
+int check_tsc_unstable(void);
+
+/*
+ * Boot-time check whether the TSCs are synchronized across
+ * all CPUs/cores:
+ */
+extern void check_tsc_sync_source(int cpu);
+extern void check_tsc_sync_target(void);
+
+extern int notsc_setup(char *);
+
+#endif /* _ASM_X86_TSC_H */