1 files changed, 52 insertions, 0 deletions
diff --git a/qemu/roms/ipxe/src/include/ipxe/null_entropy.h b/qemu/roms/ipxe/src/include/ipxe/null_entropy.h
new file mode 100644
index 000000000..646d1a17e
--- /dev/null
+++ b/qemu/roms/ipxe/src/include/ipxe/null_entropy.h
@@ -0,0 +1,52 @@
+#ifndef _IPXE_NULL_ENTROPY_H
+#define _IPXE_NULL_ENTROPY_H
+
+/** @file
+ *
+ * Nonexistent entropy source
+ *
+ * This source provides no entropy and must NOT be used in a
+ * security-sensitive environment.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <stdint.h>
+
+#ifdef ENTROPY_NULL
+#define ENTROPY_PREFIX_null
+#else
+#define ENTROPY_PREFIX_null __null_
+#endif
+
+static inline __always_inline int
+ENTROPY_INLINE ( null, entropy_enable ) ( void ) {
+	/* Do nothing */
+	return 0;
+}
+
+static inline __always_inline void
+ENTROPY_INLINE ( null, entropy_disable ) ( void ) {
+	/* Do nothing */
+}
+
+static inline __always_inline double
+ENTROPY_INLINE ( null, min_entropy_per_sample ) ( void ) {
+	/* Actual amount of min-entropy is zero.  To avoid
+	 * division-by-zero errors and to allow compilation of
+	 * entropy-consuming code, pretend to have 1 bit of entropy in
+	 * each sample.
+	 */
+	return 1.0;
+}
+
+static inline __always_inline int
+ENTROPY_INLINE ( null, get_noise ) ( noise_sample_t *noise ) {
+
+	/* All sample values are constant */
+	*noise = 0x01;
+
+	return 0;
+}
+
+#endif /* _IPXE_NULL_ENTROPY_H */