diff options
Diffstat (limited to 'src/cpu')
| -rw-r--r-- | src/cpu/x86/tsc/delay_tsc.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/src/cpu/x86/tsc/delay_tsc.c b/src/cpu/x86/tsc/delay_tsc.c index 0540496f5e..0e2a9c0faf 100644 --- a/src/cpu/x86/tsc/delay_tsc.c +++ b/src/cpu/x86/tsc/delay_tsc.c @@ -172,18 +172,18 @@ static inline unsigned long get_clocks_per_usec(void) void udelay(unsigned us) { - unsigned long long count; - unsigned long long stop; - unsigned long long clocks; + unsigned long long start; + unsigned long long current; + unsigned long long clocks; + start = rdtscll(); clocks = us; clocks *= get_clocks_per_usec(); - count = rdtscll(); - stop = clocks + count; - while(stop > count) { + current = rdtscll(); + while((current - start) < clocks) { cpu_relax(); - count = rdtscll(); - } + current = rdtscll(); + } } #if CONFIG_TSC_MONOTONIC_TIMER && !defined(__PRE_RAM__) && !defined(__SMM__) |