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sd-boot: encapsulate freq cache in ticks_freq()

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It's usually nicer to abstract a cache away in the provider of a value,
hence do so.
This commit is contained in:
Lennart Poettering 2022-02-08 11:26:49 +01:00
parent efbb86797d
commit fb63526f72
1 changed files with 10 additions and 8 deletions
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18
src/boot/efi/ticks.c
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@ -40,6 +40,10 @@ static UINT64 ticks_freq(void) {
/* count TSC ticks during a millisecond delay */
static UINT64 ticks_freq(void) {
UINT64 ticks_start, ticks_end;
static UINT64 cache = 0;
if (cache != 0)
return cache;
ticks_start = ticks_read();
BS->Stall(1000);
@ -49,23 +53,21 @@ static UINT64 ticks_freq(void) {
* archs the value is 32bit) */
return 0;
return (ticks_end - ticks_start) * 1000UL;
cache = (ticks_end - ticks_start) * 1000UL;
return cache;
}
#endif
UINT64 time_usec(void) {
UINT64 ticks;
static UINT64 freq;
UINT64 ticks, freq;
ticks = ticks_read();
if (ticks == 0)
return 0;
if (freq == 0) {
freq = ticks_freq();
if (freq == 0)
return 0;
}
freq = ticks_freq();
if (freq == 0)
return 0;
return 1000UL * 1000UL * ticks / freq;
}