1 files changed, 46 insertions, 0 deletions
diff --git a/winsup/cygwin/local_includes/cpuid.h b/winsup/cygwin/local_includes/cpuid.h
new file mode 100644
index 000000000..6dbb1bddf
--- /dev/null
+++ b/winsup/cygwin/local_includes/cpuid.h
@@ -0,0 +1,46 @@
+/* cpuid.h: Define cpuid instruction
+
+This file is part of Cygwin.
+
+This software is a copyrighted work licensed under the terms of the
+Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
+details. */
+
+#ifndef CPUID_H
+#define CPUID_H
+
+static inline void __attribute ((always_inline))
+cpuid (uint32_t *a, uint32_t *b, uint32_t *c, uint32_t *d, uint32_t ain,
+       uint32_t cin = 0)
+{
+  asm volatile ("cpuid"
+		: "=a" (*a), "=b" (*b), "=c" (*c), "=d" (*d)
+		: "a" (ain), "c" (cin));
+}
+
+#ifdef __x86_64__
+static inline bool __attribute ((always_inline))
+can_set_flag (uint32_t long flag)
+{
+  uint32_t long r1, r2;
+
+  asm volatile ("pushfq\n"
+		"popq %0\n"
+		"movq %0, %1\n"
+		"xorq %2, %0\n"
+		"pushq %0\n"
+		"popfq\n"
+		"pushfq\n"
+		"popq %0\n"
+		"pushq %1\n"
+		"popfq\n"
+		: "=&r" (r1), "=&r" (r2)
+		: "ir" (flag)
+  );
+  return ((r1 ^ r2) & flag) != 0;
+}
+#else
+#error unimplemented for this target
+#endif
+
+#endif // !CPUID_H