refactor(kernel): ♻️ rewrite time manager

Kernel/subsystem/time/kvm_clock.cpp

@@ -0,0 +1,71 @@
+/*
+	This file is part of Fennix Kernel.
+
+	Fennix Kernel is free software: you can redistribute it and/or
+	modify it under the terms of the GNU General Public License as
+	published by the Free Software Foundation, either version 3 of
+	the License, or (at your option) any later version.
+
+	Fennix Kernel is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#include <time.hpp>
+
+#include <memory.hpp>
+#include <acpi.hpp>
+#include <debug.h>
+#include <io.h>
+
+#include "../../kernel.h"
+
+#define KVM_CLOCK_PAIRING_WALLCLOCK 0
+
+namespace Time
+{
+	extern "C" void kvm_hc_clock_pairing(uint64_t phys_addr, uint64_t clock_type)
+	{
+#if defined(__amd64__)
+		asm volatile(
+			"mov $9, %%eax\n\t" /* KVM_HC_CLOCK_PAIRING */
+			"mov %%rdi, %%rbx\n\t"
+			"mov %%rsi, %%rcx\n\t"
+			"vmcall\n\t"
+			:
+			: "D"(phys_addr), "S"(clock_type)
+			: "rax", "rbx", "rcx");
+#else
+#warning "KVM clock pairing not implemented for this architecture"
+#endif
+	}
+
+	bool KVMClock::Sleep(uint64_t Nanoseconds)
+	{
+		return true;
+	}
+
+	uint64_t KVMClock::GetNanoseconds()
+	{
+		return 0;
+	}
+
+	KVMClock::KVMClock()
+	{
+		if (strcmp(CPU::Hypervisor(), x86_CPUID_VENDOR_KVM) != 0)
+			return;
+
+		this->Pairing = (kvm_clock_pairing *)KernelAllocator.RequestPages(TO_PAGES(sizeof(kvm_clock_pairing)));
+		kvm_hc_clock_pairing((uint64_t)this->Pairing, KVM_CLOCK_PAIRING_WALLCLOCK);
+		// KPrint("sec: %lld, nsec: %lld, tsc: %lld", this->Pairing->sec, this->Pairing->nsec, this->Pairing->tsc);
+		// KPrint("flags: %x", this->Pairing->flags);
+	}
+
+	KVMClock::~KVMClock()
+	{
+	}
+}