Patrick Rudolph has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/45702 )
Change subject: include/cpu/x86/tsc: Fix rdtsc on x86_64 ......................................................................
include/cpu/x86/tsc: Fix rdtsc on x86_64
The used assembler code only work on x86_32. Use the inline function 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 --- M src/include/cpu/x86/tsc.h 1 file changed, 2 insertions(+), 7 deletions(-)
git pull ssh://review.coreboot.org:29418/coreboot refs/changes/02/45702/1
diff --git a/src/include/cpu/x86/tsc.h b/src/include/cpu/x86/tsc.h index 6943b93..87a8761 100644 --- a/src/include/cpu/x86/tsc.h +++ b/src/include/cpu/x86/tsc.h @@ -43,13 +43,8 @@
static inline unsigned long long rdtscll(void) { - unsigned long long val; - asm volatile ( - TSC_SYNC - "rdtsc" - : "=A" (val) - ); - return val; + const tsc_t res = rdtsc(); + return ((unsigned long long)res.lo)|(((unsigned long long)res.hi) << 32); }
static inline uint64_t tsc_to_uint64(tsc_t tstamp)