diff --git a/include/arch/x86/msr.h b/include/arch/x86/msr.h
index 906ebf6052e..f45e0535c3b 100644
--- a/include/arch/x86/msr.h
+++ b/include/arch/x86/msr.h
@@ -25,9 +25,26 @@
 #define X86_X2APIC_BASE_MSR		0x00000800 /* .. thru 0x00000BFF */
 
 #define X86_EFER_MSR			0xC0000080
+#define X86_EFER_MSR_SCE		BIT(0)
 #define X86_EFER_MSR_LME		BIT(8)
 #define X86_EFER_MSR_NXE		BIT(11)
 
+/* STAR 31:0   Unused in long mode
+ *      47:32  Kernel CS (SS = CS+8)
+ *      63:48  User CS (SS = CS+8)
+ */
+#define X86_STAR_MSR			0xC0000081
+
+/* Location for system call entry point */
+#define X86_LSTAR_MSR			0xC0000082
+
+/* Low 32 bits in this MSR are the SYSCALL mask applied to EFLAGS */
+#define X86_FMASK_MSR			0xC0000084
+
+#define X86_FS_BASE			0xC0000100
+#define X86_GS_BASE			0xC0000101
+#define X86_KERNEL_GS_BASE		0xC0000102
+
 #ifndef _ASMLANGUAGE
 #ifdef __cplusplus
 extern "C" {