diff options
| author | Subrata Banik <subratabanik@google.com> | 2024-07-10 17:29:38 +0000 |
|---|---|---|
| committer | Subrata Banik <subratabanik@google.com> | 2024-07-11 15:27:30 +0000 |
| commit | 7f822a3368fcfabc7bb0f316a9eafba5a0604f43 (patch) | |
| tree | 7b7a5969b1fe8a6e9bb8d5a3d5082e8bd94864eb /payloads | |
| parent | e94d29a02bf50c1cc9bd9340375134832d3ad4a2 (diff) | |
libpayload/x86: Add x86-64 support to rdtsc()
This patch adds support for x86-64 to the rdtsc() function, allowing
it to correctly read the Time Stamp Counter (TSC) on both 32-bit and
64-bit x86 architectures.
BUG=b:242829490, b:351851626
TEST=Builds and boots on google/rex0 and google/rex64 systems and
manually verified correct TSC readings on x86-32 and x86-64 hardware.
Change-Id: I0afac3db2e82a245a37c2e5cf2302bf1dad62c01
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/83414
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Diffstat (limited to 'payloads')
| -rw-r--r-- | payloads/libpayload/include/x86/arch/rdtsc.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/payloads/libpayload/include/x86/arch/rdtsc.h b/payloads/libpayload/include/x86/arch/rdtsc.h index 41ab24a9c7..2c92a9f4d4 100644 --- a/payloads/libpayload/include/x86/arch/rdtsc.h +++ b/payloads/libpayload/include/x86/arch/rdtsc.h @@ -33,9 +33,9 @@ static u64 rdtsc(void) { - u64 val; - __asm__ __volatile__ ("rdtsc" : "=A" (val)); - return val; + u32 lo, hi; + __asm__ __volatile__ ("rdtsc" : "=a" (lo), "=d" (hi)); + return (u64)hi << 32 | lo; } #endif |