1 files changed, 35 insertions, 0 deletions
diff --git a/winsup/cygwin/cpuid.h b/winsup/cygwin/cpuid.h
new file mode 100644
index 000000000..1f0cc5006
--- /dev/null
+++ b/winsup/cygwin/cpuid.h
@@ -0,0 +1,35 @@
+#ifndef CPUID_H
+#define CPUID_H
+
+extern inline void
+cpuid (unsigned *a, unsigned *b, unsigned *c, unsigned *d, unsigned in)
+{
+  asm ("cpuid"
+       : "=a" (*a),
+         "=b" (*b),
+         "=c" (*c),
+         "=d" (*d)
+       : "a" (in));
+}
+
+extern inline bool
+can_set_flag (unsigned flag)
+{
+  unsigned r1, r2;
+  asm("pushfl\n"
+      "popl %0\n"
+      "movl %0, %1\n"
+      "xorl %2, %0\n"
+      "pushl %0\n"
+      "popfl\n"
+      "pushfl\n"
+      "popl %0\n"
+      "pushl %1\n"
+      "popfl\n"
+      : "=&r" (r1), "=&r" (r2)
+      : "ir" (flag)
+  );
+  return ((r1 ^ r2) & flag) != 0;
+}
+
+#endif // !CPUID_H