1 files changed, 29 insertions, 0 deletions
diff --git a/libc/random.c b/libc/random.c
index 8c8076f..cfd082d 100644
--- a/libc/random.c
+++ b/libc/random.c
@@ -1,5 +1,6 @@
 // MIT License, Copyright (c) 2020 Marvin Borner
 
+#include <cpu.h>
 #include <def.h>
 #include <mem.h>
 #include <random.h>
@@ -11,6 +12,34 @@ void srand(u32 seed)
 	g_seed = seed;
 }
 
+u32 rdrand(void)
+{
+#ifdef kernel
+	if (!cpu_has_cfeature(CPUID_FEAT_ECX_RDRND))
+		return rand();
+
+	u32 rd;
+	__asm__ volatile("rdrand %%eax" : "=a"(rd));
+	return rd;
+#else
+	return rand();
+#endif
+}
+
+u32 rdseed(void)
+{
+#ifdef kernel
+	if (!cpu_has_cfeature(CPUID_FEAT_ECX_RDRND))
+		return rand();
+
+	u32 rd;
+	__asm__ volatile("rdseed %%eax" : "=a"(rd));
+	return rd;
+#else
+	return rand();
+#endif
+}
+
 u32 rand(void)
 {
 	g_seed = g_seed * 1103515245 + 12345;