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arm64: cpuinfo: add system serial support

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Change-Id: I4542f07226e47e67be1f2792cffaa71fd6401442
Signed-off-by: Tao Huang <huangtao@rock-chips.com>
This commit is contained in:
Tao Huang 2016-10-27 19:41:45 +08:00
parent 49cc695712
commit 3936ea811f
1 changed files with 9 additions and 0 deletions
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9
arch/arm64/kernel/cpuinfo.c
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@ -35,6 +35,12 @@
#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
@ -177,6 +183,9 @@ 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;
}