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Guard against missing TSC and divide by zero in elapsed time calculations.

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This commit is contained in:
Martin Whitaker 2022-01-28 22:47:25 +00:00
parent 09890bf0cd
commit 3c69cd07b7
1 changed files with 5 additions and 2 deletions
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7
app/display.c
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@ -145,7 +145,10 @@ void display_start_run(void)
clear_screen_region(8, 66, 8, SCREEN_WIDTH - 1); // error count
display_pass_count(0);
display_error_count(0);
run_start_time = get_tsc();
if (clks_per_msec > 0) {
// If we've measured the CPU speed, we know the TSC is available.
run_start_time = get_tsc();
}
}
void display_start_pass(void)
@ -263,7 +266,7 @@ void do_tick(int my_vcpu)
display_pass_percentage(pct);
display_pass_bar((BAR_LENGTH * pct) / 100);
if (cpuid_info.flags.rdtsc) {
if (clks_per_msec > 0) {
int secs = (get_tsc() - run_start_time) / (1000 * clks_per_msec);
int mins = secs / 60; secs %= 60;
int hours = mins / 60; mins %= 60;