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libpayload/x86: Add x86-64 support to rdtsc()

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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>
This commit is contained in:
Subrata Banik
2024-07-10 17:29:38 +00:00
parent e94d29a02b
commit 7f822a3368
1 changed files with 3 additions and 3 deletions
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6
payloads/libpayload/include/x86/arch/rdtsc.h
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@ -33,9 +33,9 @@
static u64 rdtsc(void) static u64 rdtsc(void)
{ {
u64 val; u32 lo, hi;
__asm__ __volatile__ ("rdtsc" : "=A" (val)); __asm__ __volatile__ ("rdtsc" : "=a" (lo), "=d" (hi));
return val; return (u64)hi << 32 | lo;
} }
#endif #endif