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cpuid: Add helper function for cpuid(1) functions

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This patch introduces 3 helper function for cpuid(1) :

1. cpu_get_cpuid() -> to get processor id (from cpuid.eax)
2. cpu_get_feature_flags_ecx -> to get processor feature flag (from cpuid.ecx)
3. cpu_get_feature_flags_edx -> to get processor feature flag (from cpuid.edx)

Above 3 helper functions are targeted to replace majority of cpuid(1)
references.

Change-Id: Ib96a7c79dadb1feff0b8d58aa408b355fbb3bc50
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/c/30123
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
This commit is contained in:
Subrata Banik
2018-12-10 14:11:35 +05:30
parent e3110b8620
commit 53b08c347f
21 changed files with 142 additions and 86 deletions
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7
src/soc/intel/skylake/cpu.c
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@ -16,6 +16,7 @@
*/
#include <assert.h>
#include <arch/cpu.h>
#include <bootstate.h>
#include <console/console.h>
#include <device/device.h>
@ -333,12 +334,12 @@ static void enable_lapic_tpr(void)
static void configure_dca_cap(void)
{
struct cpuid_result cpuid_regs;
uint32_t feature_flag;
msr_t msr;
/* Check feature flag in CPUID.(EAX=1):ECX[18]==1 */
cpuid_regs = cpuid(1);
if (cpuid_regs.ecx & (1 << 18)) {
feature_flag = cpu_get_feature_flags_ecx();
if (feature_flag & CPUID_DCA) {
msr = rdmsr(IA32_PLATFORM_DCA_CAP);
msr.lo |= 1;
wrmsr(IA32_PLATFORM_DCA_CAP, msr);