soc/intel/skylake: Implement UNCORE PRMRR get base and mask API

Implement soc_get_uncore_prmmr_base_and_mask() API for SKL/KBL

Change-Id: I880d3d88138809cdf030507877079cbea52a0d97
Signed-off-by: Pratik Prajapati <pratikkumar.v.prajapati@intel.com>
Reviewed-on: https://review.coreboot.org/21245
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/skylake/systemagent.c

@@ -15,12 +15,14 @@
  * GNU General Public License for more details.
  */
 
+#include <cpu/x86/msr.h>
 #include <console/console.h>
 #include <delay.h>
 #include <device/device.h>
 #include <intelblocks/systemagent.h>
 #include <soc/cpu.h>
 #include <soc/iomap.h>
+#include <soc/msr.h>
 #include <soc/systemagent.h>
 
 /*
@@ -62,3 +64,14 @@ void soc_systemagent_init(struct device *dev)
 	mdelay(1);
 	set_power_limits(28);
 }
+
+int soc_get_uncore_prmmr_base_and_mask(uint64_t *prmrr_base,
+	uint64_t *prmrr_mask)
+{
+	msr_t msr;
+	msr = rdmsr(UNCORE_PRMRR_PHYS_BASE_MSR);
+	*prmrr_base = (uint64_t) msr.hi << 32 | msr.lo;
+	msr = rdmsr(UNCORE_PRMRR_PHYS_MASK_MSR);
+	*prmrr_mask = (uint64_t) msr.hi << 32 | msr.lo;
+	return 0;
+}