Merge pull request #21 from amlel-el-mahrouss/dev

kernel, boot: recovering lost changes because of some git issue.

15 files changed, 568 insertions, 423 deletions

diff --git a/dev/kernel/FSKit/Ext2.h b/dev/kernel/FSKit/Ext2.h
new file mode 100644
index 00000000..81b6853e
--- /dev/null
+++ b/dev/kernel/FSKit/Ext2.h
@@ -0,0 +1,129 @@
+/* -------------------------------------------
+
+	Copyright (C) 2024-2025, Amlal El Mahrouss, all rights reserved.
+
+------------------------------------------- */
+
+#pragma once
+
+#include <NewKit/Defines.h>
+
+/// @file Ext2.h
+/// @brief EXT2 filesystem structures and constants.
+
+#define kExt2FSMagic              (0xEF53)
+#define kExt2FSMaxFileNameLen     (255U)
+#define kExt2FSSuperblockOffset   (1024)
+#define kExt2FSRootInodeNumber    (2)
+
+#define kExt2FSInodeSize          (128U)
+#define kExt2FSBlockSizeBase      (1024U)
+
+#define kExt2FSRev0               (0)
+#define kExt2FSRev1               (1)
+
+enum
+{
+	kExt2FileTypeUnknown = 0,
+	kExt2FileTypeRegular = 1,
+	kExt2FileTypeDirectory = 2,
+	kExt2FileTypeCharDevice = 3,
+	kExt2FileTypeBlockDevice = 4,
+	kExt2FileTypeFIFO = 5,
+	kExt2FileTypeSocket = 6,
+	kExt2FileTypeSymbolicLink = 7
+};
+
+struct PACKED EXT2_SUPER_BLOCK final
+{
+	Kernel::UInt32 fInodeCount;
+	Kernel::UInt32 fBlockCount;
+	Kernel::UInt32 fReservedBlockCount;
+	Kernel::UInt32 fFreeBlockCount;
+	Kernel::UInt32 fFreeInodeCount;
+	Kernel::UInt32 fFirstDataBlock;
+	Kernel::UInt32 fLogBlockSize;
+	Kernel::UInt32 fLogFragmentSize;
+	Kernel::UInt32 fBlocksPerGroup;
+	Kernel::UInt32 fFragmentsPerGroup;
+	Kernel::UInt32 fInodesPerGroup;
+	Kernel::UInt32 fMountTime;
+	Kernel::UInt32 fWriteTime;
+	Kernel::UInt16 fMountCount;
+	Kernel::UInt16 fMaxMountCount;
+	Kernel::UInt16 fMagic; // should be 0xEF53
+	Kernel::UInt16 fState;
+	Kernel::UInt16 fErrors;
+	Kernel::UInt16 fMinorRevision;
+	Kernel::UInt32 fLastCheck;
+	Kernel::UInt32 fCheckInterval;
+	Kernel::UInt32 fCreatorOS;
+	Kernel::UInt32 fRevisionLevel;
+	Kernel::UInt16 fDefaultUID;
+	Kernel::UInt16 fDefaultGID;
+
+	// EXT2_DYNAMIC_REV fields
+	Kernel::UInt32 fFirstInode;
+	Kernel::UInt16 fInodeSize;
+	Kernel::UInt16 fBlockGroupNumber;
+	Kernel::UInt32 fFeatureCompat;
+	Kernel::UInt32 fFeatureIncompat;
+	Kernel::UInt32 fFeatureROCompat;
+	Kernel::UInt8  fUUID[16];
+	Kernel::Char   fVolumeName[16];
+	Kernel::Char   fLastMounted[64];
+	Kernel::UInt32 fAlgoBitmap;
+
+	// Optional journal fields and padding
+	Kernel::UInt8  fPreallocBlocks;
+	Kernel::UInt8  fPreallocDirBlocks;
+	Kernel::UInt16 fReservedGDTBlocks;
+
+	Kernel::UInt8  fJournalUUID[16];
+	Kernel::UInt32 fJournalInode;
+	Kernel::UInt32 fJournalDevice;
+	Kernel::UInt32 fLastOrphan;
+
+	Kernel::UInt32 fHashSeed[4];
+	Kernel::UInt8  fDefHashVersion;
+	Kernel::UInt8  fReservedCharPad;
+	Kernel::UInt16 fReservedWordPad;
+	Kernel::UInt32 fDefaultMountOpts;
+	Kernel::UInt32 fFirstMetaBlockGroup;
+
+	Kernel::UInt8  fReserved[760]; // Padding to make 1024 bytes
+};
+
+struct PACKED EXT2_INODE final
+{
+	Kernel::UInt16 fMode;
+	Kernel::UInt16 fUID;
+	Kernel::UInt32 fSize;
+	Kernel::UInt32 fAccessTime;
+	Kernel::UInt32 fCreateTime;
+	Kernel::UInt32 fModifyTime;
+	Kernel::UInt32 fDeleteTime;
+	Kernel::UInt16 fGID;
+	Kernel::UInt16 fLinksCount;
+	Kernel::UInt32 fBlocks;
+	Kernel::UInt32 fFlags;
+	Kernel::UInt32 fOSD1;
+
+	Kernel::UInt32 fBlock[15]; // 0-11: direct, 12: indirect, 13: double indirect, 14: triple indirect
+
+	Kernel::UInt32 fGeneration;
+	Kernel::UInt32 fFileACL;
+	Kernel::UInt32 fDirACL;  // Only for revision 1+
+	Kernel::UInt32 fFragmentAddr;
+
+	Kernel::UInt8  fOSD2[12];
+};
+
+struct PACKED EXT2_DIR_ENTRY final
+{
+	Kernel::UInt32 fInode;
+	Kernel::UInt16 fRecordLength;
+	Kernel::UInt8  fNameLength;
+	Kernel::UInt8  fFileType;
+	Kernel::Char   fName[kExt2FSMaxFileNameLen]; // null-terminated, not fixed-length in actual on-disk layout
+};
\ No newline at end of file
diff --git a/dev/kernel/FSKit/HeFS.h b/dev/kernel/FSKit/HeFS.h
index 6c294ec6..cf1bebfc 100644
--- a/dev/kernel/FSKit/HeFS.h
+++ b/dev/kernel/FSKit/HeFS.h
@@ -20,19 +20,30 @@
 

 #define kHeFSMinimumDiskSize (mib_cast(256))

 

+struct HeFS_BOOT_NODE;

+

 enum

 {

-	kHeFSInvalidDrive,

-	kHeFSHDDDrive,

-	kHeFSSSDDrive,

-	kHeFSMassStorageDrive,

-	kHeFSSCSIDrive,

-	kHeFSDriveCount,

+	kHeFSHardDrive		   = 0xC0, // Hard Drive

+	kHeFSSolidStateDrive   = 0xC1, // Solid State Drive

+	kHeFSOpticalDrive	   = 0x0C, // Blu-Ray/DVD

+	kHeFSMassStorageDevice = 0xCC, // USB

+	kHeFSScsiDrive		   = 0xC4, // SCSI Hard Drive

+	kHeFSFlashDrive		   = 0xC6,

+	kHeFSUnknown		   = 0xFF, // Unknown device.

+	kHeFSDriveCount		   = 7,

 };

 

-struct HeFS_BOOT_NODE;

+enum

+{

+	kHeFSStatusUnlocked = 0x18,

+	kHeFSStatusLocked,

+	kHeFSStatusError,

+	kHeFSStatusInvalid,

+	kHeFSStatusCount,

+};

 

-struct HeFS_BOOT_NODE final

+struct PACKED HeFS_BOOT_NODE final

 {

 	Kernel::Char   fMagic[kHeFSMagicLen];

 	Kernel::Char   fPartName[kHeFSPartNameLen];

@@ -47,7 +58,7 @@ struct HeFS_BOOT_NODE final
 	Kernel::UInt64 fRecoveryINode;

 };

 

-struct HeFS_INDEX_NODE

+struct PACKED HeFS_INDEX_NODE

 {

 	Kernel::Char   fName[kHeFSFileNameLen];

 	Kernel::UInt32 fFlags;

diff --git a/dev/kernel/FSKit/NeFS.h b/dev/kernel/FSKit/NeFS.h
index 3c11fdb4..747af16b 100644
--- a/dev/kernel/FSKit/NeFS.h
+++ b/dev/kernel/FSKit/NeFS.h
@@ -135,9 +135,10 @@ enum
 	kNeFSStatusLocked,
 	kNeFSStatusError,
 	kNeFSStatusInvalid,
+	kNeFSStatusCount,
 };
 
-/// @brief Catalog type.
+/// @brief Catalog record type.
 struct PACKED NEFS_CATALOG_STRUCT final
 {
 	BOOL ForkOrCatalog : 1 {0};
diff --git a/dev/kernel/FirmwareKit/GPT.h b/dev/kernel/FirmwareKit/GPT.h
index a8b53ead..9a6cffc6 100644
--- a/dev/kernel/FirmwareKit/GPT.h
+++ b/dev/kernel/FirmwareKit/GPT.h
@@ -9,7 +9,8 @@
 #include <NewKit/Defines.h>
 #include <FirmwareKit/EFI/EFI.h>
 
-#define kSectorSizeGPT (512U)
+#define kSectorAlignGPT_Part (420U)
+#define kSectorAlignGPT_PartEntry (72U)
 #define kPartNameGPT   (8U)
 
 namespace Kernel
@@ -43,7 +44,7 @@ namespace Kernel
 		UInt32	 NumPartitionEntries;
 		UInt32	 SizeOfEntries;
 		UInt32	 CRC32PartEntry;
-		UInt8	 Reserved2[kSectorSizeGPT];
+		UInt8	 Reserved2[kSectorAlignGPT_Part];
 	};
 
 	struct PACKED GPT_PARTITION_ENTRY
@@ -53,6 +54,6 @@ namespace Kernel
 		UInt64	 StartLBA;
 		UInt64	 EndLBA;
 		UInt64	 Attributes;
-		UInt8	 Name[72];
+		UInt8	 Name[kSectorAlignGPT_PartEntry];
 	};
 } // namespace Kernel
diff --git a/dev/kernel/FirmwareKit/Handover.h b/dev/kernel/FirmwareKit/Handover.h
index ecdaca64..dd529a9e 100644
--- a/dev/kernel/FirmwareKit/Handover.h
+++ b/dev/kernel/FirmwareKit/Handover.h
@@ -17,7 +17,7 @@
 
 #pragma once
 
-#include "FirmwareKit/EFI/EFI.h"
+#include <FirmwareKit/EFI/EFI.h>
 #include <NewKit/Defines.h>
 
 #define kHandoverMagic	 0xBADCC
diff --git a/dev/kernel/HALKit/AMD64/HalApplicationProcessor.cc b/dev/kernel/HALKit/AMD64/HalApplicationProcessor.cc
index 43888f3b..938907f4 100644
--- a/dev/kernel/HALKit/AMD64/HalApplicationProcessor.cc
+++ b/dev/kernel/HALKit/AMD64/HalApplicationProcessor.cc
@@ -210,24 +210,15 @@ namespace Kernel::HAL
 
 		if (kMADTBlock)
 		{
-			SizeT index = 1;
+			SizeT index = 1UL;
 
 			kSMPInterrupt = 0;
 			kSMPCount	  = 0;
 
-			kout << "SMP: Starting APs...\r";
+			kout << "SMP: Registering APIC IDs...\r";
 
 			kApicBaseAddress = kMADTBlock->Address;
 
-			constexpr auto kMemoryAPStart = 0x7C000;
-			Char*		   ptr_ap_code	  = reinterpret_cast<Char*>(kMemoryAPStart);
-
-			mm_map_page(ptr_ap_code, ptr_ap_code, kMMFlagsWr);
-
-			SizeT hal_ap_blob_len = hal_ap_blob_end - hal_ap_blob_start;
-
-			rt_copy_memory((Char*)hal_ap_blob_start, ptr_ap_code, hal_ap_blob_len);
-
 			while (Yes)
 			{
 				if (kMADTBlock->List[index].Type > 9 ||
@@ -241,18 +232,7 @@ namespace Kernel::HAL
 						break;
 
 					kAPICLocales[kSMPCount] = kMADTBlock->List[kSMPCount].LAPIC.ProcessorID;
-					(void)(kout << "SMP: APIC ID: " << number(kAPICLocales[kSMPCount]) << kendl);
-
-					// I'll just make the AP start from scratch here.
-
-					hal_send_start_ipi(kApicBaseAddress, kAPICLocales[kSMPCount]);
-
-					HardwareTimer timer(Kernel::rtl_ms(10));
-					timer.Wait();
-
-					/// TODO: HAL helper to create an address.
-
-					hal_send_sipi(kApicBaseAddress, kAPICLocales[kSMPCount], (UInt8)(((UIntPtr)ptr_ap_code) >> 12));
+					(Void)(kout << "SMP: APIC ID: " << number(kAPICLocales[kSMPCount]) << kendl);
 
 					++kSMPCount;
 					break;
@@ -264,7 +244,7 @@ namespace Kernel::HAL
 				++index;
 			}
 
-			(void)(kout << "SMP: number of APs: " << number(kSMPCount) << kendl);
+			(Void)(kout << "SMP: Number of IDs: " << number(kSMPCount) << kendl);
 
 			// Kernel is now SMP aware.
 			// That means that the scheduler is now available (on MP Kernels)
diff --git a/dev/kernel/HALKit/AMD64/HalPagingMgrAMD64.cc b/dev/kernel/HALKit/AMD64/HalPagingMgrAMD64.cc
index 4b50a3f4..16fe843a 100644
--- a/dev/kernel/HALKit/AMD64/HalPagingMgrAMD64.cc
+++ b/dev/kernel/HALKit/AMD64/HalPagingMgrAMD64.cc
@@ -143,7 +143,7 @@ namespace Kernel::HAL
 		pte->Wr				 = !!(flags & kMMFlagsWr);
 		pte->User			 = !!(flags & kMMFlagsUser);
 		pte->Nx				 = !!(flags & kMMFlagsNX);
-		pte->Pcd			 = !(flags & kMMFlagsUncached);
+		pte->Pcd			 = !(flags & kMMFlagsPCD);
 		pte->PhysicalAddress = (UIntPtr)(physical_address);
 
 		mmi_page_status(pte);
diff --git a/dev/kernel/HALKit/AMD64/Processor.h b/dev/kernel/HALKit/AMD64/Processor.h
index e375a935..a5bc82c7 100644
--- a/dev/kernel/HALKit/AMD64/Processor.h
+++ b/dev/kernel/HALKit/AMD64/Processor.h
@@ -73,7 +73,7 @@ namespace Kernel::HAL
 		kMMFlagsWr		 = 1 << 2,
 		kMMFlagsUser	 = 1 << 3,
 		kMMFlagsNX		 = 1 << 4,
-		kMMFlagsUncached = 1 << 5,
+		kMMFlagsPCD = 1 << 5,
 		kMMFlagsCount	 = 4,
 	};
 
diff --git a/dev/kernel/HALKit/AMD64/Storage/AHCI+Generic.cc b/dev/kernel/HALKit/AMD64/Storage/AHCI+Generic.cc
index 2dfd89a1..9c8f95bc 100644
--- a/dev/kernel/HALKit/AMD64/Storage/AHCI+Generic.cc
+++ b/dev/kernel/HALKit/AMD64/Storage/AHCI+Generic.cc
@@ -283,7 +283,7 @@ STATIC Bool drv_std_init_ahci(UInt16& pi, BOOL& atapi)
 			kSATADev.EnableMmio();
 			kSATADev.BecomeBusMaster();
 
-			HAL::mm_map_page((VoidPtr)mem_ahci, (VoidPtr)mem_ahci, HAL::kMMFlagsPresent | HAL::kMMFlagsWr | HAL::kMMFlagsUncached);
+			HAL::mm_map_page((VoidPtr)mem_ahci, (VoidPtr)mem_ahci, HAL::kMMFlagsPresent | HAL::kMMFlagsWr | HAL::kMMFlagsPCD);
 
 			UInt32 ports_implemented = mem_ahci->Pi;
 			UInt16 ahci_index		 = 0;
diff --git a/dev/kernel/HALKit/ARM64/Processor.h b/dev/kernel/HALKit/ARM64/Processor.h
index b108fc82..4cead7ea 100644
--- a/dev/kernel/HALKit/ARM64/Processor.h
+++ b/dev/kernel/HALKit/ARM64/Processor.h
@@ -28,7 +28,7 @@ namespace Kernel::HAL
 		kMMFlagsWr		= 1 << 1,
 		kMMFlagsUser	= 1 << 2,
 		kMMFlagsNX		= 1 << 3,
-		kMMFlagsUncached = 1 << 4,
+		kMMFlagsPCD = 1 << 4,
 		kMMFlagsCount	= 4,
 	};
 
diff --git a/dev/kernel/KernelKit/KernelProcessScheduler.h b/dev/kernel/KernelKit/KernelProcessScheduler.h
new file mode 100644
index 00000000..47d61ff7
--- /dev/null
+++ b/dev/kernel/KernelKit/KernelProcessScheduler.h
@@ -0,0 +1,7 @@
+/* -------------------------------------------
+
+	Copyright (C) 2025, Amlal El Mahrouss, all rights reserved.
+
+------------------------------------------- */
+
+#pragma once
\ No newline at end of file
diff --git a/dev/kernel/KernelKit/ProcessScheduler.h b/dev/kernel/KernelKit/ProcessScheduler.h
index cff2ce6b..038f46db 100644
--- a/dev/kernel/KernelKit/ProcessScheduler.h
+++ b/dev/kernel/KernelKit/ProcessScheduler.h
@@ -1,383 +1,10 @@
 /* -------------------------------------------
 
-	Copyright (C) 2024-2025, Amlal El Mahrouss, all rights reserved.
+	Copyright (C) 2025, Amlal El Mahrouss, all rights reserved.
 
 ------------------------------------------- */
 
-#ifndef INC_PROCESS_SCHEDULER_H
-#define INC_PROCESS_SCHEDULER_H
+#pragma once
 
-/// @file ProcessScheduler.h
-/// @brief Process scheduler code and definitions.
-/// @author Amlal El Mahrouss (amlal@nekernel.org)
-
-#include <ArchKit/ArchKit.h>
-#include <KernelKit/LockDelegate.h>
-#include <KernelKit/User.h>
-#include <NewKit/MutableArray.h>
-
-#define kSchedMinMicroTime		  (AffinityKind::kStandard)
-#define kSchedInvalidPID		  (-1)
-#define kSchedProcessLimitPerTeam (32U)
-
-#define kSchedMaxMemoryLimit gib_cast(128) /* max physical memory limit */
-#define kSchedMaxStackSz	 mib_cast(8)   /* maximum stack size */
-
-#define kSchedNameLen (128U)
-
-////////////////////////////////////////////////////
-// Last revision date is: Fri Mar 28 2025		  //
-////////////////////////////////////////////////////
-
-namespace Kernel
-{
-	//! @brief Forward declarations.
-
-	class IDylibObject;
-	class Process;
-	class ProcessTeam;
-	class UserProcessScheduler;
-	class UserProcessHelper;
-
-	typedef UInt64 PTime;
-
-	/***********************************************************************************/
-	//! @brief Local Process identifier.
-	/***********************************************************************************/
-	typedef Int64 ProcessID;
-
-	/***********************************************************************************/
-	//! @brief Local Process status enum.
-	/***********************************************************************************/
-	enum class ProcessStatusKind : Int32
-	{
-		kInvalid,
-		kStarting,
-		kRunning,
-		kKilled,
-		kFrozen,
-		kFinished,
-		kCount,
-	};
-
-	/***********************************************************************************/
-	//! @brief Affinity is the amount of nano-seconds this process is going to run.
-	/***********************************************************************************/
-	enum class AffinityKind : Int32
-	{
-		kRealTime	  = 500,
-		kVeryHigh	  = 250,
-		kHigh		  = 200,
-		kStandard	  = 1000,
-		kLowUsage	  = 1500,
-		kVeryLowUsage = 2000,
-	};
-
-	/***********************************************************************************/
-	//! Operators for AffinityKind
-	/***********************************************************************************/
-
-	inline bool operator<(AffinityKind lhs, AffinityKind rhs)
-	{
-		Int32 lhs_int = static_cast<Int>(lhs);
-		Int32 rhs_int = static_cast<Int>(rhs);
-
-		return lhs_int < rhs_int;
-	}
-
-	inline bool operator>(AffinityKind lhs, AffinityKind rhs)
-	{
-		Int32 lhs_int = static_cast<Int>(lhs);
-		Int32 rhs_int = static_cast<Int>(rhs);
-
-		return lhs_int > rhs_int;
-	}
-
-	inline bool operator<=(AffinityKind lhs, AffinityKind rhs)
-	{
-		Int32 lhs_int = static_cast<Int>(lhs);
-		Int32 rhs_int = static_cast<Int>(rhs);
-
-		return lhs_int <= rhs_int;
-	}
-
-	inline bool operator>=(AffinityKind lhs, AffinityKind rhs)
-	{
-		Int32 lhs_int = static_cast<Int>(lhs);
-		Int32 rhs_int = static_cast<Int>(rhs);
-
-		return lhs_int >= rhs_int;
-	}
-
-	/***********************************************************************************/
-	/// @brief Subsystem enum type.
-	/***********************************************************************************/
-
-	enum class ProcessSubsystem : Int32
-	{
-		kProcessSubsystemSecurity = 100,
-		kProcessSubsystemApplication,
-		kProcessSubsystemService,
-		kProcessSubsystemDriver,
-		kProcessSubsystemInvalid = 256U,
-		kProcessSubsystemCount	 = 4,
-	};
-
-	using ProcessTime = UInt64;
-	using PID		  = Int64;
-
-	/***********************************************************************************/
-	/// @note For User manager, tells where we run the code.
-	/***********************************************************************************/
-	enum class ProcessLevelRing : Int32
-	{
-		kRingStdUser   = 1,
-		kRingSuperUser = 2,
-		kRingGuestUser = 5,
-		kRingCount	   = 5,
-	};
-
-	/***********************************************************************************/
-	/// @brief Helper type to describe a code image.
-	/***********************************************************************************/
-	using ImagePtr = VoidPtr;
-
-	struct ProcessImage final
-	{
-		explicit ProcessImage() = default;
-
-		ImagePtr fCode;
-		ImagePtr fBlob;
-
-		Bool HasCode()
-		{
-			return this->fCode != nullptr;
-		}
-
-		Bool HasImage()
-		{
-			return this->fBlob != nullptr;
-		}
-	};
-
-	/***********************************************************************************/
-	/// @name Process
-	/// @brief Process class, holds information about the running process/thread.
-	/***********************************************************************************/
-	class Process final
-	{
-	public:
-		explicit Process();
-		~Process();
-
-	public:
-		NE_COPY_DEFAULT(Process)
-
-	public:
-		Char			   Name[kSchedNameLen] = {"Process"};
-		ProcessSubsystem   SubSystem{ProcessSubsystem::kProcessSubsystemInvalid};
-		User*			   Owner{nullptr};
-		HAL::StackFramePtr StackFrame{nullptr};
-		AffinityKind	   Affinity{AffinityKind::kStandard};
-		ProcessStatusKind  Status{ProcessStatusKind::kFinished};
-		UInt8*			   StackReserve{nullptr};
-		ProcessImage	   Image{};
-		SizeT			   StackSize{kSchedMaxStackSz};
-		IDylibObject*	   DylibDelegate{nullptr};
-		SizeT			   MemoryCursor{0UL};
-		SizeT			   MemoryLimit{kSchedMaxMemoryLimit};
-		SizeT			   UsedMemory{0UL};
-
-		struct ProcessMemoryHeapList final
-		{
-			VoidPtr MemoryEntry{nullptr};
-			SizeT	MemoryEntrySize{0UL};
-			SizeT	MemoryEntryPad{0UL};
-
-			struct ProcessMemoryHeapList* MemoryPrev{nullptr};
-			struct ProcessMemoryHeapList* MemoryNext{nullptr};
-		};
-
-		struct ProcessSignal final
-		{
-			UIntPtr			  SignalArg;
-			ProcessStatusKind PreviousStatus;
-			UIntPtr			  SignalID;
-		};
-
-		ProcessSignal		   ProcessSignal;
-		ProcessMemoryHeapList* ProcessMemoryHeap{nullptr};
-		ProcessTeam*		   ProcessParentTeam;
-
-		VoidPtr VMRegister{0UL};
-
-		enum
-		{
-			kInvalidExecutableKind,
-			kExectuableKind,
-			kExectuableDylibKind,
-			kExectuableKindCount,
-		};
-
-		ProcessTime PTime{0}; //! @brief Process allocated tine.
-
-		PID	  ProcessId{kSchedInvalidPID};
-		Int32 Kind{kExectuableKind};
-
-	public:
-		/***********************************************************************************/
-		//! @brief boolean operator, check status.
-		/***********************************************************************************/
-		operator bool();
-
-		/***********************************************************************************/
-		///! @brief Crashes the app, exits with code ~0.
-		/***********************************************************************************/
-		Void Crash();
-
-		/***********************************************************************************/
-		///! @brief Exits the app.
-		/***********************************************************************************/
-		Void Exit(const Int32& exit_code = 0);
-
-		/***********************************************************************************/
-		///! @brief TLS allocate.
-		///! @param sz size of data structure.
-		///! @param pad_amount amount to add after pointer.
-		///! @return A wrapped pointer, or error code.
-		/***********************************************************************************/
-		ErrorOr<VoidPtr> New(SizeT sz, SizeT pad_amount = 0);
-
-		/***********************************************************************************/
-		///! @brief TLS free.
-		///! @param ptr the pointer to free.
-		///! @param sz the size of it.
-		/***********************************************************************************/
-		template <typename T>
-		Boolean Delete(ErrorOr<T*> ptr);
-
-		/***********************************************************************************/
-		///! @brief Wakes up thread.
-		/***********************************************************************************/
-		Void Wake(Bool wakeup = false);
-
-	public:
-		/***********************************************************************************/
-		//! @brief Gets the local exit code.
-		/***********************************************************************************/
-		const UInt32& GetExitCode() noexcept;
-
-		/***********************************************************************************/
-		///! @brief Get the process's name
-		///! @example 'C Runtime Library'
-		/***********************************************************************************/
-		const Char* GetName() noexcept;
-
-		/***********************************************************************************/
-		//! @brief return local error code of process.
-		//! @return Int32 local error code.
-		/***********************************************************************************/
-		Int32& GetLocalCode() noexcept;
-
-		const User*				 GetOwner() noexcept;
-		const ProcessStatusKind& GetStatus() noexcept;
-		const AffinityKind&		 GetAffinity() noexcept;
-
-	private:
-		UInt32 fLastExitCode{0};
-		Int32  fLocalCode{0};
-
-		friend UserProcessScheduler;
-		friend UserProcessHelper;
-	};
-
-	/// \brief Processs Team (contains multiple processes inside it.)
-	/// Equivalent to a process batch
-	class ProcessTeam final
-	{
-	public:
-		explicit ProcessTeam();
-		~ProcessTeam() = default;
-
-		NE_COPY_DEFAULT(ProcessTeam)
-
-		Array<Process, kSchedProcessLimitPerTeam>& AsArray();
-		Ref<Process>&							   AsRef();
-		ProcessID&								   Id() noexcept;
-
-	public:
-		Array<Process, kSchedProcessLimitPerTeam> mProcessList;
-		Ref<Process>							  mCurrentProcess;
-		ProcessID								  mTeamId{0};
-		ProcessID								  mProcessCount{0};
-	};
-
-	typedef Array<Process, kSchedProcessLimitPerTeam> UserThreadArray;
-
-	using UserProcessRef = Process&;
-
-	/***********************************************************************************/
-	/// @brief Process scheduler class.
-	/// The main class which you call to schedule user processes.
-	/***********************************************************************************/
-	class UserProcessScheduler final : public ISchedulable
-	{
-		friend class UserProcessHelper;
-
-	public:
-		explicit UserProcessScheduler()	 = default;
-		~UserProcessScheduler() override = default;
-
-		NE_COPY_DEFAULT(UserProcessScheduler)
-
-			 operator bool();
-		bool operator!();
-
-	public:
-		ProcessTeam& CurrentTeam();
-
-	public:
-		ProcessID Spawn(const Char* name, VoidPtr code, VoidPtr image);
-		Void	  Remove(ProcessID process_id);
-
-		Bool IsUser() override;
-		Bool IsKernel() override;
-		Bool HasMP() override;
-
-	public:
-		Ref<Process>& CurrentProcess();
-		SizeT		  Run() noexcept;
-
-	public:
-		STATIC UserProcessScheduler& The();
-
-	private:
-		ProcessTeam mTeam{};
-	};
-
-	/***********************************************************************************/
-	/**
-	 * \brief Process helper class, which contains needed utilities for the scheduler.
-	 */
-	/***********************************************************************************/
-
-	class UserProcessHelper final
-	{
-	public:
-		STATIC Bool Switch(VoidPtr image_ptr, UInt8* stack_ptr, HAL::StackFramePtr frame_ptr, PID new_pid);
-		STATIC Bool CanBeScheduled(const Process& process);
-		STATIC ErrorOr<PID> TheCurrentPID();
-		STATIC SizeT		StartScheduling();
-	};
-
-	const UInt32& sched_get_exit_code(void) noexcept;
-} // namespace Kernel
-
-#include <KernelKit/ThreadLocalStorage.h>
-#include <KernelKit/UserProcessScheduler.inl>
-
-////////////////////////////////////////////////////
-// END
-////////////////////////////////////////////////////
-
-#endif /* ifndef INC_PROCESS_SCHEDULER_H */
+#include <KernelKit/UserProcessScheduler.h>
+#include <KernelKit/KernelProcessScheduler.h>
\ No newline at end of file
diff --git a/dev/kernel/KernelKit/UserProcessScheduler.h b/dev/kernel/KernelKit/UserProcessScheduler.h
new file mode 100644
index 00000000..a99fc45b
--- /dev/null
+++ b/dev/kernel/KernelKit/UserProcessScheduler.h
@@ -0,0 +1,383 @@
+/* -------------------------------------------
+
+	Copyright (C) 2024-2025, Amlal El Mahrouss, all rights reserved.
+
+------------------------------------------- */
+
+#ifndef INC_PROCESS_SCHEDULER_H
+#define INC_PROCESS_SCHEDULER_H
+
+/// @file ProcessScheduler.h
+/// @brief Process scheduler code and definitions.
+/// @author Amlal El Mahrouss (amlal@nekernel.org)
+
+#include <ArchKit/ArchKit.h>
+#include <KernelKit/LockDelegate.h>
+#include <KernelKit/User.h>
+#include <NewKit/MutableArray.h>
+
+#define kSchedMinMicroTime		  (AffinityKind::kStandard)
+#define kSchedInvalidPID		  (-1)
+#define kSchedProcessLimitPerTeam (32U)
+
+#define kSchedMaxMemoryLimit gib_cast(128) /* max physical memory limit */
+#define kSchedMaxStackSz	 mib_cast(8)   /* maximum stack size */
+
+#define kSchedNameLen (128U)
+
+////////////////////////////////////////////////////
+// Last revision date is: Fri Mar 28 2025		  //
+////////////////////////////////////////////////////
+
+namespace Kernel
+{
+	//! @brief Forward declarations.
+
+	class IDylibObject;
+	class Process;
+	class ProcessTeam;
+	class UserProcessScheduler;
+	class UserProcessHelper;
+
+	typedef UInt64 PTime;
+
+	/***********************************************************************************/
+	//! @brief Local Process identifier.
+	/***********************************************************************************/
+	typedef Int64 ProcessID;
+
+	/***********************************************************************************/
+	//! @brief Local Process status enum.
+	/***********************************************************************************/
+	enum class ProcessStatusKind : Int32
+	{
+		kInvalid,
+		kStarting,
+		kRunning,
+		kKilled,
+		kFrozen,
+		kFinished,
+		kCount,
+	};
+
+	/***********************************************************************************/
+	//! @brief Affinity is the amount of nano-seconds this process is going to run.
+	/***********************************************************************************/
+	enum class AffinityKind : Int32
+	{
+		kRealTime	  = 500,
+		kVeryHigh	  = 250,
+		kHigh		  = 200,
+		kStandard	  = 1000,
+		kLowUsage	  = 1500,
+		kVeryLowUsage = 2000,
+	};
+
+	/***********************************************************************************/
+	//! Operators for AffinityKind
+	/***********************************************************************************/
+
+	inline bool operator<(AffinityKind lhs, AffinityKind rhs)
+	{
+		Int32 lhs_int = static_cast<Int>(lhs);
+		Int32 rhs_int = static_cast<Int>(rhs);
+
+		return lhs_int < rhs_int;
+	}
+
+	inline bool operator>(AffinityKind lhs, AffinityKind rhs)
+	{
+		Int32 lhs_int = static_cast<Int>(lhs);
+		Int32 rhs_int = static_cast<Int>(rhs);
+
+		return lhs_int > rhs_int;
+	}
+
+	inline bool operator<=(AffinityKind lhs, AffinityKind rhs)
+	{
+		Int32 lhs_int = static_cast<Int>(lhs);
+		Int32 rhs_int = static_cast<Int>(rhs);
+
+		return lhs_int <= rhs_int;
+	}
+
+	inline bool operator>=(AffinityKind lhs, AffinityKind rhs)
+	{
+		Int32 lhs_int = static_cast<Int>(lhs);
+		Int32 rhs_int = static_cast<Int>(rhs);
+
+		return lhs_int >= rhs_int;
+	}
+
+	/***********************************************************************************/
+	/// @brief Subsystem enum type.
+	/***********************************************************************************/
+
+	enum class ProcessSubsystem : Int32
+	{
+		kProcessSubsystemSecurity = 100,
+		kProcessSubsystemApplication,
+		kProcessSubsystemService,
+		kProcessSubsystemDriver,
+		kProcessSubsystemInvalid = 256U,
+		kProcessSubsystemCount	 = 4,
+	};
+
+	using ProcessTime = UInt64;
+	using PID		  = Int64;
+
+	/***********************************************************************************/
+	/// @note For User manager, tells where we run the code.
+	/***********************************************************************************/
+	enum class ProcessLevelRing : Int32
+	{
+		kRingStdUser   = 1,
+		kRingSuperUser = 2,
+		kRingGuestUser = 5,
+		kRingCount	   = 5,
+	};
+
+	/***********************************************************************************/
+	/// @brief Helper type to describe a code image.
+	/***********************************************************************************/
+	using ImagePtr = VoidPtr;
+
+	struct ProcessImage final
+	{
+		explicit ProcessImage() = default;
+
+		ImagePtr fCode;
+		ImagePtr fBlob;
+
+		Bool HasCode()
+		{
+			return this->fCode != nullptr;
+		}
+
+		Bool HasImage()
+		{
+			return this->fBlob != nullptr;
+		}
+	};
+
+	/***********************************************************************************/
+	/// @name Process
+	/// @brief Process class, holds information about the running process/thread.
+	/***********************************************************************************/
+	class Process final
+	{
+	public:
+		explicit Process();
+		~Process();
+
+	public:
+		NE_COPY_DEFAULT(Process)
+
+	public:
+		Char			   Name[kSchedNameLen] = {"Process"};
+		ProcessSubsystem   SubSystem{ProcessSubsystem::kProcessSubsystemInvalid};
+		User*			   Owner{nullptr};
+		HAL::StackFramePtr StackFrame{nullptr};
+		AffinityKind	   Affinity{AffinityKind::kStandard};
+		ProcessStatusKind  Status{ProcessStatusKind::kFinished};
+		UInt8*			   StackReserve{nullptr};
+		ProcessImage	   Image{};
+		SizeT			   StackSize{kSchedMaxStackSz};
+		IDylibObject*	   DylibDelegate{nullptr};
+		SizeT			   MemoryCursor{0UL};
+		SizeT			   MemoryLimit{kSchedMaxMemoryLimit};
+		SizeT			   UsedMemory{0UL};
+
+		struct ProcessMemoryHeapList final
+		{
+			VoidPtr MemoryEntry{nullptr};
+			SizeT	MemoryEntrySize{0UL};
+			SizeT	MemoryEntryPad{0UL};
+
+			struct ProcessMemoryHeapList* MemoryPrev{nullptr};
+			struct ProcessMemoryHeapList* MemoryNext{nullptr};
+		};
+
+		struct ProcessSignal final
+		{
+			UIntPtr			  SignalArg;
+			ProcessStatusKind PreviousStatus;
+			UIntPtr			  SignalID;
+		};
+
+		ProcessSignal		   ProcessSignal;
+		ProcessMemoryHeapList* ProcessMemoryHeap{nullptr};
+		ProcessTeam*		   ProcessParentTeam;
+
+		VoidPtr VMRegister{0UL};
+
+		enum
+		{
+			kInvalidExecutableKind,
+			kExecutableKind,
+			kExecutableDylibKind,
+			kExecutableKindCount,
+		};
+
+		ProcessTime PTime{0}; //! @brief Process allocated tine.
+
+		PID	  ProcessId{kSchedInvalidPID};
+		Int32 Kind{kExecutableKind};
+
+	public:
+		/***********************************************************************************/
+		//! @brief boolean operator, check status.
+		/***********************************************************************************/
+		operator bool();
+
+		/***********************************************************************************/
+		///! @brief Crashes the app, exits with code ~0.
+		/***********************************************************************************/
+		Void Crash();
+
+		/***********************************************************************************/
+		///! @brief Exits the app.
+		/***********************************************************************************/
+		Void Exit(const Int32& exit_code = 0);
+
+		/***********************************************************************************/
+		///! @brief TLS allocate.
+		///! @param sz size of data structure.
+		///! @param pad_amount amount to add after pointer.
+		///! @return A wrapped pointer, or error code.
+		/***********************************************************************************/
+		ErrorOr<VoidPtr> New(SizeT sz, SizeT pad_amount = 0);
+
+		/***********************************************************************************/
+		///! @brief TLS free.
+		///! @param ptr the pointer to free.
+		///! @param sz the size of it.
+		/***********************************************************************************/
+		template <typename T>
+		Boolean Delete(ErrorOr<T*> ptr);
+
+		/***********************************************************************************/
+		///! @brief Wakes up thread.
+		/***********************************************************************************/
+		Void Wake(Bool wakeup = false);
+
+	public:
+		/***********************************************************************************/
+		//! @brief Gets the local exit code.
+		/***********************************************************************************/
+		const UInt32& GetExitCode() noexcept;
+
+		/***********************************************************************************/
+		///! @brief Get the process's name
+		///! @example 'C Runtime Library'
+		/***********************************************************************************/
+		const Char* GetName() noexcept;
+
+		/***********************************************************************************/
+		//! @brief return local error code of process.
+		//! @return Int32 local error code.
+		/***********************************************************************************/
+		Int32& GetLocalCode() noexcept;
+
+		const User*				 GetOwner() noexcept;
+		const ProcessStatusKind& GetStatus() noexcept;
+		const AffinityKind&		 GetAffinity() noexcept;
+
+	private:
+		UInt32 fLastExitCode{0};
+		Int32  fLocalCode{0};
+
+		friend UserProcessScheduler;
+		friend UserProcessHelper;
+	};
+
+	/// \brief Processs Team (contains multiple processes inside it.)
+	/// Equivalent to a process batch
+	class ProcessTeam final
+	{
+	public:
+		explicit ProcessTeam();
+		~ProcessTeam() = default;
+
+		NE_COPY_DEFAULT(ProcessTeam)
+
+		Array<Process, kSchedProcessLimitPerTeam>& AsArray();
+		Ref<Process>&							   AsRef();
+		ProcessID&								   Id() noexcept;
+
+	public:
+		Array<Process, kSchedProcessLimitPerTeam> mProcessList;
+		Ref<Process>							  mCurrentProcess;
+		ProcessID								  mTeamId{0};
+		ProcessID								  mProcessCount{0};
+	};
+
+	typedef Array<Process, kSchedProcessLimitPerTeam> UserThreadArray;
+
+	using UserProcessRef = Process&;
+
+	/***********************************************************************************/
+	/// @brief Process scheduler class.
+	/// The main class which you call to schedule user processes.
+	/***********************************************************************************/
+	class UserProcessScheduler final : public ISchedulable
+	{
+		friend class UserProcessHelper;
+
+	public:
+		explicit UserProcessScheduler()	 = default;
+		~UserProcessScheduler() override = default;
+
+		NE_COPY_DEFAULT(UserProcessScheduler)
+
+			 operator bool();
+		bool operator!();
+
+	public:
+		ProcessTeam& CurrentTeam();
+
+	public:
+		ProcessID Spawn(const Char* name, VoidPtr code, VoidPtr image);
+		Void	  Remove(ProcessID process_id);
+
+		Bool IsUser() override;
+		Bool IsKernel() override;
+		Bool HasMP() override;
+
+	public:
+		Ref<Process>& CurrentProcess();
+		SizeT		  Run() noexcept;
+
+	public:
+		STATIC UserProcessScheduler& The();
+
+	private:
+		ProcessTeam mTeam{};
+	};
+
+	/***********************************************************************************/
+	/**
+	 * \brief Process helper class, which contains needed utilities for the scheduler.
+	 */
+	/***********************************************************************************/
+
+	class UserProcessHelper final
+	{
+	public:
+		STATIC Bool Switch(VoidPtr image_ptr, UInt8* stack_ptr, HAL::StackFramePtr frame_ptr, PID new_pid);
+		STATIC Bool CanBeScheduled(const Process& process);
+		STATIC ErrorOr<PID> TheCurrentPID();
+		STATIC SizeT		StartScheduling();
+	};
+
+	const UInt32& sched_get_exit_code(void) noexcept;
+} // namespace Kernel
+
+#include <KernelKit/ThreadLocalStorage.h>
+#include <KernelKit/UserProcessScheduler.inl>
+
+////////////////////////////////////////////////////
+// END
+////////////////////////////////////////////////////
+
+#endif /* ifndef INC_PROCESS_SCHEDULER_H */
diff --git a/dev/kernel/src/BitMapMgr.cc b/dev/kernel/src/BitMapMgr.cc
index fe4b9625..96cbb803 100644
--- a/dev/kernel/src/BitMapMgr.cc
+++ b/dev/kernel/src/BitMapMgr.cc
@@ -78,7 +78,7 @@ namespace Kernel
 					if (user)
 						flags |= kMMFlagsUser;
 
-					flags |= HAL::kMMFlagsUncached;
+					flags |= HAL::kMMFlagsPCD;
 
 					return flags;
 				}
diff --git a/dev/kernel/src/UserProcessScheduler.cc b/dev/kernel/src/UserProcessScheduler.cc
index b2052723..5e8cc89e 100644
--- a/dev/kernel/src/UserProcessScheduler.cc
+++ b/dev/kernel/src/UserProcessScheduler.cc
@@ -255,7 +255,7 @@ namespace Kernel
 		this->StackFrame   = nullptr;
 		this->StackReserve = nullptr;
 
-		if (this->Kind == kExectuableDylibKind)
+		if (this->Kind == kExecutableDylibKind)
 		{
 			Bool success = false;
 
@@ -325,6 +325,8 @@ namespace Kernel
 			return kErrorProcessFault;
 		}
 
+		rt_set_memory(process.StackFrame, 0, sizeof(HAL::StackFrame));
+
 #ifdef __NE_VIRTUAL_MEMORY_SUPPORT__
 		flags = HAL::kMMFlagsPresent;
 		flags |= HAL::kMMFlagsWr;
@@ -336,11 +338,14 @@ namespace Kernel
 		// React according to process kind.
 		switch (process.Kind)
 		{
-		case Process::kExectuableDylibKind: {
+		case Process::kExecutableDylibKind: {
 			process.DylibDelegate = rtl_init_dylib(process);
 			MUST_PASS(process.DylibDelegate);
 			break;
 		}
+		case Process::kExecutableKind: {
+			break;
+		}
 		default: {
 			(void)(kout << "Unknown process kind: " << hex_number(process.Kind) << kendl);
 			break;
@@ -348,7 +353,6 @@ namespace Kernel
 		}
 
 		process.StackReserve = new UInt8[process.StackSize];
-		rt_set_memory(process.StackReserve, 0, process.StackSize);
 
 		if (!process.StackReserve)
 		{
@@ -356,6 +360,8 @@ namespace Kernel
 			return kErrorProcessFault;
 		}
 
+		rt_set_memory(process.StackReserve, 0, process.StackSize);
+
 #ifdef __NE_VIRTUAL_MEMORY_SUPPORT__
 		flags = HAL::kMMFlagsPresent;
 		flags |= HAL::kMMFlagsWr;