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-rw-r--r--src/arch/x86/cpu.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/src/arch/x86/cpu.c b/src/arch/x86/cpu.c
index 5afae8b486..cba105a5db 100644
--- a/src/arch/x86/cpu.c
+++ b/src/arch/x86/cpu.c
@@ -19,6 +19,7 @@
#include <cpu/x86/mtrr.h>
#include <cpu/x86/msr.h>
#include <cpu/x86/lapic.h>
+#include <cpu/x86/tsc.h>
#include <arch/cpu.h>
#include <device/path.h>
#include <device/device.h>
@@ -291,4 +292,21 @@ void cpu_initialize(unsigned int index)
void lb_arch_add_records(struct lb_header *header)
{
+ uint32_t freq_khz;
+ struct lb_tsc_info *tsc_info;
+
+ /* Don't advertise a TSC rate unless it's constant. */
+ if (!IS_ENABLED(CONFIG_TSC_CONSTANT_RATE))
+ return;
+
+ freq_khz = tsc_freq_mhz() * 1000;
+
+ /* No use exposing a TSC frequency that is zero. */
+ if (freq_khz == 0)
+ return;
+
+ tsc_info = (void *)lb_new_record(header);
+ tsc_info->tag = LB_TAG_TSC_INFO;
+ tsc_info->size = sizeof(*tsc_info);
+ tsc_info->freq_khz = freq_khz;
}