soc/intel/common: Move SGX supported API to cpulib

Move is_sgx_supported() API to common cpulib code, so that
this function can be used by other code without enabling
SOC_INTEL_COMMON_BLOCK_SGX_ENABLE config option.

Change-Id: Ib630ac451152ae2471c862fced992dde3b49d05d
Signed-off-by: Pratikkumar Prajapati <pratikkumar.v.prajapati@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/71116
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Sridhar Siricilla <sridhar.siricilla@intel.com>

src/soc/intel/common/block/cpu/cpulib.c

@@ -523,3 +523,13 @@ unsigned int smbios_cpu_get_max_speed_mhz(void)
 {
 	return cpu_get_max_turbo_ratio() * CONFIG_CPU_BCLK_MHZ;
 }
+
+bool is_sgx_supported(void)
+{
+	struct cpuid_result cpuid_regs;
+	msr_t msr;
+
+	cpuid_regs = cpuid_ext(0x7, 0x0); /* EBX[2] is feature capability */
+	msr = rdmsr(MTRR_CAP_MSR); /* Bit 12 is PRMRR enablement */
+	return ((cpuid_regs.ebx & SGX_SUPPORTED) && (msr.lo & MTRR_CAP_PRMRR));
+}

src/soc/intel/common/block/include/intelblocks/cpulib.h

@@ -211,4 +211,10 @@ bool is_tme_supported(void);
  */
 void set_tme_core_activate(void);
 
+/*
+ * This function checks if the CPU supports SGX feature.
+ * Returns true if SGX feature is supported otherwise false.
+ */
+bool is_sgx_supported(void);
+
 #endif	/* SOC_INTEL_COMMON_BLOCK_CPULIB_H */

src/soc/intel/common/block/include/intelblocks/sgx.h

@@ -5,11 +5,6 @@
 
 #include <soc/nvs.h>
 
-/*
- * Check if SGX is supported
- */
-int is_sgx_supported(void);
-
 /*
  * Configure core PRMRR.
  * PRMRR needs to configured first on all cores and then

src/soc/intel/common/block/sgx/sgx.c

@@ -12,16 +12,6 @@
 #include <soc/cpu.h>
 #include <soc/pci_devs.h>
 
-int is_sgx_supported(void)
-{
-	struct cpuid_result cpuid_regs;
-	msr_t msr;
-
-	cpuid_regs = cpuid_ext(0x7, 0x0); /* EBX[2] is feature capability */
-	msr = rdmsr(MTRR_CAP_MSR); /* Bit 12 is PRMRR enablement */
-	return ((cpuid_regs.ebx & SGX_SUPPORTED) && (msr.lo & MTRR_CAP_PRMRR));
-}
-
 void prmrr_core_configure(void)
 {
 	msr_t prmrr_base, prmrr_mask;