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HV: timer: keep TSC frequency in KHz

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This patch represents TSC freqeuency in KHz using a 32-bit unsigned integer.

The conversion macros between ticks and us/ms are changed to inline functions to
enforce the types of the input parameters. Note that us_to_ticks accepts only
uint32_t (~4K us at most) and never overflows.

Results of some unit tests on the conversion functions:

    calibrate_tsc, tsc_khz=1881600
    64us -> ticks: 120422
    64us -> ticks -> us: 63
    511us -> ticks: 961497
    511us -> ticks -> us: 510
    1280000 ticks -> us: 680
    1280000 ticks -> us -> ticks: 1279488

Signed-off-by: Junjie Mao <junjie.mao@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Junjie Mao
2018-07-03 03:41:02 +08:00
committed by lijinxia
parent ffc0b27db4
commit e75cca64c8
7 changed files with 33 additions and 15 deletions
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2
hypervisor/lib/udelay.c
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@@ -11,7 +11,7 @@ void udelay(uint32_t us)
uint64_t dest_tsc, delta_tsc;
/* Calculate number of ticks to wait */
delta_tsc = US_TO_TICKS(us);
delta_tsc = us_to_ticks(us);
dest_tsc = rdtsc() + delta_tsc;
/* Loop until time expired */