diff options
| author | Patrick Georgi <pgeorgi@chromium.org> | 2015-07-06 20:50:33 +0200 |
|---|---|---|
| committer | Stefan Reinauer <stefan.reinauer@coreboot.org> | 2015-07-07 02:35:52 +0200 |
| commit | 49a8c8a3adc94c76542389b0bb3dcabec9eb7280 (patch) | |
| tree | f66b691ab61398226e8ae5581c6dcd2563b0624a /src/northbridge/intel/sandybridge | |
| parent | 11ac97bb2b4f9d58e899880f536d437a305f3829 (diff) | |
sandybridge: provide monotonic timer function
This fixes building the ELOG_GSMI feature by using the TSC as time source for
the flash drivers.
It's not the most precise clock, but should be good enough for the purpose.
Change-Id: I2d416c34268236228300a9e868628c35e22bf40c
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: http://review.coreboot.org/10813
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'src/northbridge/intel/sandybridge')
| -rw-r--r-- | src/northbridge/intel/sandybridge/udelay.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/src/northbridge/intel/sandybridge/udelay.c b/src/northbridge/intel/sandybridge/udelay.c index b150253247..7c9838015a 100644 --- a/src/northbridge/intel/sandybridge/udelay.c +++ b/src/northbridge/intel/sandybridge/udelay.c @@ -53,3 +53,23 @@ void udelay(u32 us) } while ((tsc.hi < tsc1.hi) || ((tsc.hi == tsc1.hi) && (tsc.lo < tsc1.lo))); } + +#if CONFIG_LAPIC_MONOTONIC_TIMER && !defined(__PRE_RAM__) +#include <timer.h> + +void timer_monotonic_get(struct mono_time *mt) +{ + tsc_t tsc; + msr_t msr; + u32 fsb = 100, divisor; + u32 d; /* ticks per us */ + + msr = rdmsr(0xce); + divisor = (msr.lo >> 8) & 0xff; + d = fsb * divisor; /* On Core/Core2 this is divided by 4 */ + + tsc = rdtsc(); + + mt->microseconds = (long)((((uint64_t)tsc.hi << 32) | tsc.lo) / d); +} +#endif |