Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / ipxe / src / arch / i386 / include / ipxe / rtc_entropy.h

diff --git a/qemu/roms/ipxe/src/arch/i386/include/ipxe/rtc_entropy.h b/qemu/roms/ipxe/src/arch/i386/include/ipxe/rtc_entropy.h
new file mode 100644 (file)
index 0000000..6c3cf21
--- /dev/null
+++ b/qemu/roms/ipxe/src/arch/i386/include/ipxe/rtc_entropy.h
@@ -0,0 +1,62 @@
+#ifndef _IPXE_RTC_ENTROPY_H
+#define _IPXE_RTC_ENTROPY_H
+
+/** @file
+ *
+ * RTC-based entropy source
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <stdint.h>
+
+#ifdef ENTROPY_RTC
+#define ENTROPY_PREFIX_rtc
+#else
+#define ENTROPY_PREFIX_rtc __rtc_
+#endif
+
+/**
+ * min-entropy per sample
+ *
+ * @ret min_entropy    min-entropy of each sample
+ */
+static inline __always_inline double
+ENTROPY_INLINE ( rtc, min_entropy_per_sample ) ( void ) {
+
+       /* The min-entropy has been measured on several platforms
+        * using the entropy_sample test code.  Modelling the samples
+        * as independent, and using a confidence level of 99.99%, the
+        * measurements were as follows:
+        *
+        *    qemu-kvm          : 7.38 bits
+        *    VMware            : 7.46 bits
+        *    Physical hardware : 2.67 bits
+        *
+        * We choose the lowest of these (2.67 bits) and apply a 50%
+        * safety margin to allow for some potential non-independence
+        * of samples.
+        */
+       return 1.3;
+}
+
+extern uint8_t rtc_sample ( void );
+
+/**
+ * Get noise sample
+ *
+ * @ret noise          Noise sample
+ * @ret rc             Return status code
+ */
+static inline __always_inline int
+ENTROPY_INLINE ( rtc, get_noise ) ( noise_sample_t *noise ) {
+
+       /* Get sample */
+       *noise = rtc_sample();
+
+       /* Always successful */
+       return 0;
+}
+
+#endif /* _IPXE_RTC_ENTROPY_H */