1 files changed, 117 insertions, 0 deletions
diff --git a/dev/kernel/HALKit/AMD64/HalKernelMain.cc b/dev/kernel/HALKit/AMD64/HalKernelMain.cc
new file mode 100644
index 00000000..543e267b
--- /dev/null
+++ b/dev/kernel/HALKit/AMD64/HalKernelMain.cc
@@ -0,0 +1,117 @@
+/* -------------------------------------------
+
+	Copyright (C) 2024-2025, Amlal EL Mahrouss, all rights reserved.
+
+------------------------------------------- */
+
+#include <StorageKit/AHCI.h>
+#include <ArchKit/ArchKit.h>
+#include <KernelKit/UserProcessScheduler.h>
+#include <KernelKit/HardwareThreadScheduler.h>
+#include <KernelKit/CodeMgr.h>
+#include <modules/ACPI/ACPIFactoryInterface.h>
+#include <NetworkKit/IPC.h>
+#include <CFKit/Property.h>
+#include <modules/CoreGfx/TextMgr.h>
+
+EXTERN_C NeOS::VoidPtr kInterruptVectorTable[];
+EXTERN_C NeOS::VoidPtr mp_user_switch_proc;
+EXTERN_C NeOS::Char mp_user_switch_proc_stack_begin[];
+
+STATIC NeOS::Void hal_init_scheduler_team()
+{
+	for (NeOS::SizeT i = 0U; i < NeOS::UserProcessScheduler::The().CurrentTeam().AsArray().Count(); ++i)
+	{
+		NeOS::UserProcessScheduler::The().CurrentTeam().AsArray()[i]		= NeOS::UserProcess();
+		NeOS::UserProcessScheduler::The().CurrentTeam().AsArray()[i].Status = NeOS::ProcessStatusKind::kKilled;
+	}
+}
+
+STATIC NeOS::UInt64 hal_rdtsc_fn()
+{
+	NeOS::UInt32 lo, hi;
+	__asm__ volatile("rdtsc"
+					 : "=a"(lo), "=d"(hi));
+
+	return ((NeOS::UInt64)hi << 32) | lo;
+}
+
+STATIC NeOS::UInt64 kStartTim, kEndTim;
+
+/// @brief Kernel init procedure.
+EXTERN_C void hal_init_platform(
+	NeOS::HEL::BootInfoHeader* handover_hdr)
+{
+	kStartTim = hal_rdtsc_fn();
+
+	kHandoverHeader = handover_hdr;
+
+	if (kHandoverHeader->f_Magic != kHandoverMagic &&
+		kHandoverHeader->f_Version != kHandoverVersion)
+	{
+		return;
+	}
+
+	hal_init_scheduler_team();
+
+	/************************************** */
+	/*     INITIALIZE BIT MAP.              */
+	/************************************** */
+
+	kKernelBitMpSize  = kHandoverHeader->f_BitMapSize;
+	kKernelBitMpStart = reinterpret_cast<NeOS::VoidPtr>(
+		reinterpret_cast<NeOS::UIntPtr>(kHandoverHeader->f_BitMapStart));
+
+	/************************************** */
+	/*     INITIALIZE GDT AND SEGMENTS. */
+	/************************************** */
+
+	STATIC CONST auto kGDTEntriesCount = 6;
+
+	/* GDT, mostly descriptors for user and kernel segments. */
+	STATIC NeOS::HAL::Detail::NE_GDT_ENTRY ALIGN(0x08) kGDTArray[kGDTEntriesCount] = {
+		{.fLimitLow = 0, .fBaseLow = 0, .fBaseMid = 0, .fAccessByte = 0x00, .fFlags = 0x00, .fBaseHigh = 0},   // Null entry
+		{.fLimitLow = 0x0, .fBaseLow = 0, .fBaseMid = 0, .fAccessByte = 0x9A, .fFlags = 0xAF, .fBaseHigh = 0}, // Kernel code
+		{.fLimitLow = 0x0, .fBaseLow = 0, .fBaseMid = 0, .fAccessByte = 0x92, .fFlags = 0xCF, .fBaseHigh = 0}, // Kernel data
+		{.fLimitLow = 0x0, .fBaseLow = 0, .fBaseMid = 0, .fAccessByte = 0xFA, .fFlags = 0xAF, .fBaseHigh = 0}, // User code
+		{.fLimitLow = 0x0, .fBaseLow = 0, .fBaseMid = 0, .fAccessByte = 0xF2, .fFlags = 0xCF, .fBaseHigh = 0}, // User data
+	};
+
+	// Load memory descriptors.
+	NeOS::HAL::RegisterGDT gdt_reg;
+
+	gdt_reg.Base  = reinterpret_cast<NeOS::UIntPtr>(kGDTArray);
+	gdt_reg.Limit = (sizeof(NeOS::HAL::Detail::NE_GDT_ENTRY) * kGDTEntriesCount) - 1;
+
+	FB::fb_clear_video();
+
+	//! GDT will load hal_read_init after it successfully loads the segments.
+	NeOS::HAL::GDTLoader gdt_loader;
+	gdt_loader.Load(gdt_reg);
+
+	NeOS::ke_panic(RUNTIME_CHECK_BOOTSTRAP);
+}
+
+EXTERN_C NeOS::Void hal_real_init(NeOS::Void) noexcept
+{
+	NeOS::NeFS::fs_init_nefs();
+
+	NeOS::HAL::mp_get_cores(kHandoverHeader->f_HardwareTables.f_VendorPtr);
+
+	NeOS::HAL::Register64 idt_reg;
+
+	idt_reg.Base = (NeOS::UIntPtr)kInterruptVectorTable;
+
+	NeOS::HAL::IDTLoader idt_loader;
+
+	kEndTim = hal_rdtsc_fn();
+
+	kout << "Cycles Spent Before Userland: " << NeOS::number(kEndTim - kStartTim) << kendl;
+
+	idt_loader.Load(idt_reg);
+
+	while (YES)
+	{
+		continue;
+	}
+}