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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/arch/x86/cpuid.c
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@@ -139,7 +139,7 @@ static void init_vcpuid_entry(__unused struct vm *vm,
* EBX, ECX, EDX: RESERVED (reserved fields are set to zero).
*/
case 0x40000010:
entry->eax = (uint32_t)(tsc_hz / 1000);
entry->eax = tsc_khz;
entry->ebx = 0;
entry->ecx = 0;
entry->edx = 0;