diff options
Diffstat (limited to 'src/cpu/x86')
| -rw-r--r-- | src/cpu/x86/Kconfig | 9 | ||||
| -rw-r--r-- | src/cpu/x86/tsc/Makefile.inc | 8 | ||||
| -rw-r--r-- | src/cpu/x86/tsc/delay_tsc.c | 23 |
3 files changed, 10 insertions, 30 deletions
diff --git a/src/cpu/x86/Kconfig b/src/cpu/x86/Kconfig index b316c1ffc3..85ebd831ea 100644 --- a/src/cpu/x86/Kconfig +++ b/src/cpu/x86/Kconfig @@ -34,12 +34,9 @@ config UDELAY_TSC bool default n -config TSC_CONSTANT_RATE - def_bool n - depends on UDELAY_TSC - help - This option asserts that the TSC ticks at a known constant rate. - Therefore, no TSC calibration is required. +config UNKNOWN_TSC_RATE + bool + default y if LAPIC_MONOTONIC_TIMER config TSC_MONOTONIC_TIMER def_bool n diff --git a/src/cpu/x86/tsc/Makefile.inc b/src/cpu/x86/tsc/Makefile.inc index ab7453f262..b3925b5051 100644 --- a/src/cpu/x86/tsc/Makefile.inc +++ b/src/cpu/x86/tsc/Makefile.inc @@ -1,6 +1,6 @@ bootblock-$(CONFIG_UDELAY_TSC) += delay_tsc.c ramstage-$(CONFIG_UDELAY_TSC) += delay_tsc.c -romstage-$(CONFIG_TSC_CONSTANT_RATE) += delay_tsc.c -verstage-$(CONFIG_TSC_CONSTANT_RATE) += delay_tsc.c -postcar-$(CONFIG_TSC_CONSTANT_RATE) += delay_tsc.c -smm-$(CONFIG_TSC_CONSTANT_RATE) += delay_tsc.c +romstage-$(CONFIG_UDELAY_TSC) += delay_tsc.c +verstage-$(CONFIG_UDELAY_TSC) += delay_tsc.c +postcar-$(CONFIG_UDELAY_TSC) += delay_tsc.c +smm-$(CONFIG_UDELAY_TSC) += delay_tsc.c diff --git a/src/cpu/x86/tsc/delay_tsc.c b/src/cpu/x86/tsc/delay_tsc.c index afcd1d1f7d..7aa887ae63 100644 --- a/src/cpu/x86/tsc/delay_tsc.c +++ b/src/cpu/x86/tsc/delay_tsc.c @@ -18,26 +18,9 @@ #include <delay.h> #include <thread.h> -static unsigned long clocks_per_usec CAR_GLOBAL; - -static unsigned long calibrate_tsc(void) -{ - if (CONFIG(TSC_CONSTANT_RATE)) - return tsc_freq_mhz(); - else - return calibrate_tsc_with_pit(); -} - void init_timer(void) { - if (!car_get_var(clocks_per_usec)) - car_set_var(clocks_per_usec, calibrate_tsc()); -} - -static inline unsigned long get_clocks_per_usec(void) -{ - init_timer(); - return car_get_var(clocks_per_usec); + (void)tsc_freq_mhz(); } void udelay(unsigned int us) @@ -51,7 +34,7 @@ void udelay(unsigned int us) start = rdtscll(); clocks = us; - clocks *= get_clocks_per_usec(); + clocks *= tsc_freq_mhz(); current = rdtscll(); while ((current - start) < clocks) { cpu_relax(); @@ -89,7 +72,7 @@ void timer_monotonic_get(struct mono_time *mt) current_tick = rdtscll(); ticks_elapsed = current_tick - mono_counter->last_value; - ticks_per_usec = get_clocks_per_usec(); + ticks_per_usec = tsc_freq_mhz(); /* Update current time and tick values only if a full tick occurred. */ if (ticks_elapsed >= ticks_per_usec) { |