Change in coreboot[master]: cpu/intel/hyperthreading: Use cpuid_get_max_func()

[Kyösti Mälkki (Code Review)]

Attention is currently required from: Patrick Rudolph.
Kyösti Mälkki has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/58384 )

Change subject: cpu/intel/hyperthreading: Use cpuid_get_max_func()
......................................................................

cpu/intel/hyperthreading: Use cpuid_get_max_func()

Change-Id: I4b69b1d20b5a768c269d85f0ea23f79e02391a71
Signed-off-by: Kyösti Mälkki 
---
M src/cpu/intel/common/hyperthreading.c
1 file changed, 5 insertions(+), 3 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/84/58384/1

diff --git a/src/cpu/intel/common/hyperthreading.c b/src/cpu/intel/common/hyperthreading.c
index 2936770..3297b381 100644
--- a/src/cpu/intel/common/hyperthreading.c
+++ b/src/cpu/intel/common/hyperthreading.c
@@ -19,24 +19,26 @@
 {
    struct cpuid_result result;
    unsigned int core_ids, apic_ids, threads;
+	unsigned int max_leaf;

if (!intel_ht_supported())
    	return false;

-	if (cpuid_eax(0) >= 0xb) {
+	max_leaf = cpuid_get_max_func();
+	if (max_leaf >= 0xb) {
    	result = cpuid_ext(0xb, 0);
    	const uint32_t div = 1 << (result.eax & 0x1f);
    	return result.edx % div > 0;
    }

apic_ids = 1;
-	if (cpuid_eax(0) >= 1)
+	if (max_leaf >= 1)
    	apic_ids = (cpuid_ebx(1) >> 16) & 0xff;
    if (apic_ids == 0)
    	apic_ids = 1;

core_ids = 1;
-	if (cpuid_eax(0) >= 4) {
+	if (max_leaf >= 4) {
    	result = cpuid_ext(4, 0);
    	core_ids += (result.eax >> 26) & 0x3f;
    }