x86: Record the CPU details when starting each core

As each core starts up, record its microcode version and CPU ID so these can
be presented with the 'cpu detail' command.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/cpu/intel_common/microcode.c b/arch/x86/cpu/intel_common/microcode.c
index 3054fab..daf0d69 100644
--- a/arch/x86/cpu/intel_common/microcode.c
+++ b/arch/x86/cpu/intel_common/microcode.c
@@ -64,8 +64,12 @@
 	return 0;
 }
 
-static inline uint32_t microcode_read_rev(void)
+int microcode_read_rev(void)
 {
+	/* Quark does not have microcode MSRs */
+#ifdef CONFIG_INTEL_QUARK
+	return 0;
+#else
 	/*
 	 * Some Intel CPUs can be very finicky about the CPUID sequence used.
 	 * So this is implemented in assembly so that it works reliably.
@@ -90,6 +94,7 @@
 	);
 
 	return high;
+#endif
 }
 
 static void microcode_read_cpu(struct microcode_update *cpu)