soc/intel/common: Add API to check Key Locker support

Add is_keylocker_supported() API in common cpulib.

This function checks if the CPU supports Key Locker feature.
Returns true if Key Locker feature is supported otherwise false.

Change-Id: Ide9e59a4f11a63df48838eab02c2c584cced12e1
Signed-off-by: Pratikkumar Prajapati <pratikkumar.v.prajapati@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/71117
Reviewed-by: Sridhar Siricilla <sridhar.siricilla@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/src/soc/intel/common/block/cpu/cpulib.c b/src/soc/intel/common/block/cpu/cpulib.c
index 0e783447cf..534feb1155 100644
--- a/src/soc/intel/common/block/cpu/cpulib.c
+++ b/src/soc/intel/common/block/cpu/cpulib.c
@@ -533,3 +533,13 @@ bool is_sgx_supported(void)
 	msr = rdmsr(MTRR_CAP_MSR); /* Bit 12 is PRMRR enablement */
 	return ((cpuid_regs.ebx & SGX_SUPPORTED) && (msr.lo & MTRR_CAP_PRMRR));
 }
+
+bool is_keylocker_supported(void)
+{
+	struct cpuid_result cpuid_regs;
+	msr_t msr;
+
+	cpuid_regs = cpuid_ext(0x7, 0x0); /* ECX[23] is feature capability */
+	msr = rdmsr(MTRR_CAP_MSR); /* Bit 12 is PRMRR enablement */
+	return ((cpuid_regs.ecx & KEYLOCKER_SUPPORTED) && (msr.lo & MTRR_CAP_PRMRR));
+}