diff --git a/src/soc/amd/stoneyridge/cpu.c b/src/soc/amd/stoneyridge/cpu.c
index 39db1f4..2f4c0d0 100644
--- a/src/soc/amd/stoneyridge/cpu.c
+++ b/src/soc/amd/stoneyridge/cpu.c
@@ -15,6 +15,7 @@
 #include <soc/cpu.h>
 #include <soc/iomap.h>
 #include <console/console.h>
+#include <types.h>
 
 /*
  * MP and SMM loading initialization.
@@ -69,3 +70,8 @@
 	.ops      = &cpu_dev_ops,
 	.id_table = cpu_table,
 };
+
+uint32_t get_pstate_0_reg(void)
+{
+	return (pci_read_config32(SOC_PM_DEV, CORE_PERF_BOOST_CTRL) >> 2) & 0x7;
+}