arm64: cpuinfo: add system serial support

[firefly-linux-kernel-4.4.55.git] / arch / arm64 / kernel / cpuinfo.c

diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c
index cd5277012114c601239133e47dfe50ebcb36dd3c..fa51b6ddaceafa88b1e9c7edc2ef54de22217d4e 100644 (file)
--- a/arch/arm64/kernel/cpuinfo.c
+++ b/arch/arm64/kernel/cpuinfo.c
@@ -34,6 +34,12 @@
 #include <linux/smp.h>
 #include <linux/delay.h>
 
+unsigned int system_serial_low;
+EXPORT_SYMBOL(system_serial_low);
+
+unsigned int system_serial_high;
+EXPORT_SYMBOL(system_serial_high);
+
 /*
  * In case the boot CPU is hotpluggable, we record its initial state and
  * current state separately. Certain system registers may contain different
@@ -157,6 +163,9 @@ static int c_show(struct seq_file *m, void *v)
                seq_printf(m, "CPU revision\t: %d\n\n", MIDR_REVISION(midr));
        }
 
+       seq_printf(m, "Serial\t\t: %08x%08x\n",
+                  system_serial_high, system_serial_low);
+
        return 0;
 }