kernel: Refactor AHCI I/O path, enhance memory allocators, and cleanup obsolete script

- Removed unused `build_gcc.sh` script.
- Namespaced CPU feature flags under `NeOS` and transitioned from enum to unnamed enum for scoping.
- Renamed `drv_std_input_output` to `drv_std_input_output_ahci` for clarity.
- Improved AHCI driver documentation and added zeroing for read buffers.
- Added optional `pad` parameter to memory allocators: `mm_alloc_bitmap`, `mm_new_heap`, `PageMgr::Request`, etc.
- Updated bitmap allocator to correctly handle and align with padded sizes.
- Added `fPad` field to memory header block.
- Fixed `ATA-DMA` mode comment, corrected PRD usage and logic.
- Improved code documentation and formatting in `UserProcessScheduler`, `PageMgr`, and related components.
- Enhanced safety in process memory cleanup (e.g., `StackReserve` cleanup).

Signed-off-by: Amlal El Mahrouss <amlal@nekernel.org>

1 files changed, 7 insertions, 2 deletions

diff --git a/dev/kernel/src/MemoryMgr.cc b/dev/kernel/src/MemoryMgr.cc
index 7a79b906..271dfa23 100644
--- a/dev/kernel/src/MemoryMgr.cc
+++ b/dev/kernel/src/MemoryMgr.cc
@@ -67,6 +67,9 @@ namespace NeOS
 			/// @brief 64-bit target offset pointer.
 			UIntPtr fOffset;
 
+			/// @brief Padding.
+			UInt32 fPad;
+
 			/// @brief Padding bytes for header.
 			UInt8 fPadding[kMemoryMgrAlignSz];
 		};
@@ -116,7 +119,7 @@ namespace NeOS
 	/// @param wr Read Write bit.
 	/// @param user User enable bit.
 	/// @return The newly allocated pointer.
-	_Output VoidPtr mm_new_heap(const SizeT sz, const bool wr, const bool user)
+	_Output VoidPtr mm_new_heap(const SizeT sz, const Bool wr, const Bool user, const SizeT pad_amount)
 	{
 		auto sz_fix = sz;
 
@@ -126,7 +129,7 @@ namespace NeOS
 		sz_fix += sizeof(Detail::MM_INFORMATION_BLOCK);
 
 		PageMgr heap_mgr;
-		auto	wrapper = heap_mgr.Request(wr, user, No, sz_fix);
+		auto	wrapper = heap_mgr.Request(wr, user, No, sz_fix, pad_amount);
 
 		Detail::MM_INFORMATION_BLOCK_PTR heap_info_ptr =
 			reinterpret_cast<Detail::MM_INFORMATION_BLOCK_PTR>(
@@ -140,6 +143,7 @@ namespace NeOS
 		heap_info_ptr->fWriteRead = wr;
 		heap_info_ptr->fUser	  = user;
 		heap_info_ptr->fPresent	  = Yes;
+		heap_info_ptr->fPad		  = pad_amount;
 
 		rt_set_memory(heap_info_ptr->fPadding, 0, kMemoryMgrAlignSz);
 
@@ -232,6 +236,7 @@ namespace NeOS
 			heap_info_ptr->fWriteRead = No;
 			heap_info_ptr->fUser	  = No;
 			heap_info_ptr->fMagic	  = 0;
+			heap_info_ptr->fPad		  = 0;
 
 			kout << "Address has been successfully freed: " << hex_number((UIntPtr)heap_info_ptr) << kendl;