On Thu, 2018-04-12 at 15:12 -0700, Ivan Gorinov wrote:
> Coreboot timestamp functions and Quark memory reference code use
> get_tbclk() to get TSC frequency. This will not work if another
> early timer is selected.
>
> Add tsc_rate_mhz() function and use it in the code that specifically
> needs to get TSC rate regardless of currently selected early timer.
> void delay_n(uint32_t ns)
> {
> /* 1000 MHz clock has 1ns period --> no conversion required
> */
> - uint64_t final_tsc = rdtsc();
> + uint64_t start_tsc = rdtsc();
> + uint64_t ticks;
>
> - final_tsc += ((get_tbclk_mhz() * ns) / 1000);
> -
> - while (rdtsc() < final_tsc)
> - ;
> + ticks = (tsc_rate_mhz() * ns) / 1000;
> + while (rdtsc() - start_tsc < ticks);
I would rather preserve existing style.
> }
> /* Delay number of microseconds */
> -void delay_u(uint32_t ms)
> +void delay_u(uint32_t us)
> {
> /* 64-bit math is not an option, just use loops */
> - while (ms--)
> + while (us--)
> delay_n(1000);
> }
This is a separate change.
--
Andy Shevchenko <[email protected]>
Intel Finland Oy
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