RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-05-31 13:28:11 +00:00
Code Issues Activity Actions

Kernel: Abstract platform-specific current time methods from Scheduler

Browse source 
This change ensures that the scheduler doesn't depend on a platform
specific or arch-specific code when it initializes itself, but rather we
ensure that in compile-time we will generate the appropriate code to
find the correct arch-specific current time methods.
This commit is contained in:
Liav A 2022-10-08 04:27:48 +03:00 • committed by Linus Groh
parent c439a34ff7
commit 3651d9701e
5 changed files with 71 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

16
Kernel/Scheduler.cpp
View file

@ -8,6 +8,7 @@
#include <AK/ScopeGuard.h>
#include <AK/Singleton.h>
#include <AK/Time.h>
#include <Kernel/Arch/CurrentTime.h>
#include <Kernel/Arch/InterruptDisabler.h>
#include <Kernel/Arch/x86/TrapFrame.h>
#include <Kernel/Debug.h>
@ -365,11 +366,6 @@ Process* Scheduler::colonel()
return s_colonel_process;
}
static u64 current_time_tsc()
{
return read_tsc();
}
static u64 current_time_monotonic()
{
// We always need a precise timestamp here, we cannot rely on a coarse timestamp
@ -380,13 +376,11 @@ UNMAP_AFTER_INIT void Scheduler::initialize()
{
VERIFY(Processor::is_initialized()); // sanity check
// Figure out a good scheduling time source
if (Processor::current().has_feature(CPUFeature::TSC) && Processor::current().has_feature(CPUFeature::CONSTANT_TSC)) {
current_time = current_time_tsc;
} else {
// TODO: Using HPET is rather slow, can we use any other time source that may be faster?
auto* possible_arch_specific_current_time_function = optional_current_time();
if (possible_arch_specific_current_time_function)
current_time = possible_arch_specific_current_time_function;
else
current_time = current_time_monotonic;
}
LockRefPtr<Thread> idle_thread;
g_finalizer_wait_queue = new WaitQueue;