diff options
| author | Patrick Rudolph <patrick.rudolph@9elements.com> | 2020-09-24 20:32:53 +0200 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2020-09-28 09:36:00 +0000 |
| commit | 0348bbe9715710eca2ac93b535128cd0a5238d30 (patch) | |
| tree | be47640fe178efd7f1055744eeac5f24be87393f /src | |
| parent | 597922ecb4ab02467ab07ce86b0258da6b67ee99 (diff) | |
include/cpu/x86/tsc: Fix rdtsc on x86_64
The used assembler code only works on x86_32, but not on x86_64.
Use the inline functions to provide valid rdtsc readings on both
x86_32 and x86_64.
Tested on Lenovo T410 with additional x86_64 patches.
Change-Id: Icf706d6fb751372651e5e56d1856ddad688d9fa3
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45702
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Diffstat (limited to 'src')
| -rw-r--r-- | src/include/cpu/x86/tsc.h | 14 |
1 files changed, 4 insertions, 10 deletions
diff --git a/src/include/cpu/x86/tsc.h b/src/include/cpu/x86/tsc.h index 6943b93018..ddce96bb39 100644 --- a/src/include/cpu/x86/tsc.h +++ b/src/include/cpu/x86/tsc.h @@ -41,20 +41,14 @@ static inline void multiply_to_tsc(tsc_t *const tsc, const u32 a, const u32 b) tsc->hi = ((a >> 16) * (b >> 16)) + (tsc->hi >> 16); } -static inline unsigned long long rdtscll(void) +static inline uint64_t tsc_to_uint64(tsc_t tstamp) { - unsigned long long val; - asm volatile ( - TSC_SYNC - "rdtsc" - : "=A" (val) - ); - return val; + return (((uint64_t)tstamp.hi) << 32) + tstamp.lo; } -static inline uint64_t tsc_to_uint64(tsc_t tstamp) +static inline unsigned long long rdtscll(void) { - return (((uint64_t)tstamp.hi) << 32) + tstamp.lo; + return tsc_to_uint64(rdtsc()); } /* Provided by CPU/chipset code for the TSC rate in MHz. */ |