Change in coreboot[master]: soc/intel/alderlake: Define a method to return a cpu type

[Sridhar Siricilla (Code Review)]

Attention is currently required from: Tim Wawrzynczak, Patrick Rudolph.
Sridhar Siricilla has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/59361 )

Change subject: soc/intel/alderlake: Define a method to return a cpu type
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soc/intel/alderlake: Define a method to return a cpu type

The patch implements get_cpu_type() function returns the type of cpu
that executing the function.

TEST=Verified on Brya

Signed-off-by: Sridhar Siricilla 
Change-Id: Ifecedac822de71ebbdd43afe8431fd8aa1cdba4c
---
M src/soc/intel/alderlake/cpu.c
M src/soc/intel/alderlake/include/soc/cpu.h
2 files changed, 27 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/61/59361/1

diff --git a/src/soc/intel/alderlake/cpu.c b/src/soc/intel/alderlake/cpu.c
index 59f50f1..be8b011 100644
--- a/src/soc/intel/alderlake/cpu.c
+++ b/src/soc/intel/alderlake/cpu.c
@@ -62,6 +62,31 @@
    wrmsr(MSR_POWER_CTL, msr);
 }

+static uint32_t cpu_get_family(void)
+{
+	return cpuid_eax(1) & 0x0FFF0FF0;
+}
+
+uint8_t get_cpu_type(void)
+{
+	if (cpu_is_hybrid_supported()) {
+		union cpuid_nat_model_id_and_core_type {
+			struct {
+				unsigned int native_mode_id:24;
+				unsigned int core_type:8;
+			} bits;
+			unsigned int hybrid_info;
+		};
+		union cpuid_nat_model_id_and_core_type eax;
+
+		eax.hybrid_info = cpuid_eax(CPUID_HYBRID_INFORMATION);
+		return (UINT8) eax.bits.core_type & 0xFF;
+	} else if (cpu_get_family() == CPUID_FULL_FAMILY_MODEL_ALDERLAKE_ATOM)
+		return CPUID_CORE_TYPE_INTEL_ATOM;
+	else
+		return CPUID_CORE_TYPE_INTEL_CORE;
+}
+
 /* All CPUs including BSP will run the following function. */
 void soc_core_init(struct device *cpu)
 {
diff --git a/src/soc/intel/alderlake/include/soc/cpu.h b/src/soc/intel/alderlake/include/soc/cpu.h
index 233e0c2..06b44a2 100644
--- a/src/soc/intel/alderlake/include/soc/cpu.h
+++ b/src/soc/intel/alderlake/include/soc/cpu.h
@@ -31,4 +31,6 @@
 /* Get a bitmask of supported LPM states */
 uint8_t get_supported_lpm_mask(void);

+/* It returns the cpu type - big or small core */
+uint8_t get_cpu_type(void);
 #endif