From a9764dabeeedf8c6cb89affcbf4fab76fd3d76dc Mon Sep 17 00:00:00 2001
From: Idan Horowitz <idan.horowitz@gmail.com>
Date: Mon, 21 Mar 2022 22:59:07 +0200
Subject: [PATCH] Kernel: Add helpers for rdrand and rdseed

---
 Kernel/Arch/x86/ASM_wrapper.h | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/Kernel/Arch/x86/ASM_wrapper.h b/Kernel/Arch/x86/ASM_wrapper.h
index 63733f1790..9fce75e875 100644
--- a/Kernel/Arch/x86/ASM_wrapper.h
+++ b/Kernel/Arch/x86/ASM_wrapper.h
@@ -160,6 +160,28 @@ ALWAYS_INLINE u64 read_tsc()
     return ((u64)msw << 32) | lsw;
 }
 
+ALWAYS_INLINE u32 rdrand()
+{
+    u32 value;
+    asm volatile(
+        "1:\n"
+        "rdrand %0\n"
+        "jnc 1b\n"
+        : "=r"(value)::"cc");
+    return value;
+}
+
+ALWAYS_INLINE u32 rdseed()
+{
+    u32 value;
+    asm volatile(
+        "1:\n"
+        "rdseed %0\n"
+        "jnc 1b\n"
+        : "=r"(value)::"cc");
+    return value;
+}
+
 void stac();
 void clac();