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Kernel: Move Scheduler current time method to the TimeManagement code

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Liav A 2022-10-10 17:36:18 +03:00 • committed by Linus Groh
parent 3651d9701e
commit 7520acd4eb
5 changed files with 29 additions and 22 deletions
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22
Kernel/Time/TimeManagement.cpp
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@ -17,6 +17,7 @@
# include <Kernel/Arch/x86/common/Interrupts/APIC.h>
# include <Kernel/Arch/x86/common/RTC.h>
#endif
#include <Kernel/Arch/CurrentTime.h>
#include <Kernel/CommandLine.h>
#include <Kernel/Firmware/ACPI/Parser.h>
#include <Kernel/PerformanceManager.h>
@ -40,6 +41,22 @@ TimeManagement& TimeManagement::the()
return *s_the;
}
// The s_scheduler_specific_current_time function provides a current time for scheduling purposes,
// which may not necessarily relate to wall time
static u64 (*s_scheduler_current_time)();
static u64 current_time_monotonic()
{
// We always need a precise timestamp here, we cannot rely on a coarse timestamp
return (u64)TimeManagement::the().monotonic_time(TimePrecision::Precise).to_nanoseconds();
}
u64 TimeManagement::scheduler_current_time()
{
VERIFY(s_scheduler_current_time);
return s_scheduler_current_time();
}
ErrorOr<void> TimeManagement::validate_clock_id(clockid_t clock_id)
{
switch (clock_id) {
@ -163,6 +180,11 @@ UNMAP_AFTER_INIT void TimeManagement::initialize([[maybe_unused]] u32 cpu)
apic_timer->enable_local_timer();
}
}
auto* possible_arch_specific_current_time_function = optional_current_time();
if (possible_arch_specific_current_time_function)
s_scheduler_current_time = possible_arch_specific_current_time_function;
else
s_scheduler_current_time = current_time_monotonic;
#endif
}