diff options
| -rw-r--r-- | src/arch/x86/cpu.c | 18 | ||||
| -rw-r--r-- | src/commonlib/include/commonlib/coreboot_tables.h | 8 |
2 files changed, 26 insertions, 0 deletions
diff --git a/src/arch/x86/cpu.c b/src/arch/x86/cpu.c index 5afae8b486a1..cba105a5db24 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; } diff --git a/src/commonlib/include/commonlib/coreboot_tables.h b/src/commonlib/include/commonlib/coreboot_tables.h index 43adb093755c..5c2879159445 100644 --- a/src/commonlib/include/commonlib/coreboot_tables.h +++ b/src/commonlib/include/commonlib/coreboot_tables.h @@ -335,6 +335,14 @@ struct lb_cbmem_entry { uint32_t id; }; +#define LB_TAG_TSC_INFO 0x0032 +struct lb_tsc_info { + uint32_t tag; + uint32_t size; + + uint32_t freq_khz; +}; + #define LB_TAG_SERIALNO 0x002a #define MAX_SERIALNO_LENGTH 32 |