From 58d2af14429be02b580cde5b3e23978530d8ab74 Mon Sep 17 00:00:00 2001
From: Amlal El Mahrouss <amlal@nekernel.org>
Date: Wed, 21 May 2025 10:19:07 +0200
Subject: feat(kernel): Architectural changes, and introducing a kKernelVM.

see code for more details.

Signed-off-by: Amlal El Mahrouss <amlal@nekernel.org>
---
 dev/kernel/src/HardwareThreadScheduler.cc |  4 ++--
 dev/kernel/src/UserProcessScheduler.cc    | 23 ++++++++++++++++-------
 2 files changed, 18 insertions(+), 9 deletions(-)

(limited to 'dev/kernel/src')

diff --git a/dev/kernel/src/HardwareThreadScheduler.cc b/dev/kernel/src/HardwareThreadScheduler.cc
index b801632c..23365af5 100644
--- a/dev/kernel/src/HardwareThreadScheduler.cc
+++ b/dev/kernel/src/HardwareThreadScheduler.cc
@@ -21,7 +21,7 @@ namespace Kernel {
 /***********************************************************************************/
 
 EXTERN_C Bool hal_check_stack(HAL::StackFramePtr frame);
-EXTERN_C Bool mp_register_process(HAL::StackFramePtr frame, ProcessID pid);
+EXTERN_C Bool mp_register_task(HAL::StackFramePtr frame, ProcessID pid);
 
 STATIC HardwareThreadScheduler kHardwareThreadScheduler;
 
@@ -94,7 +94,7 @@ Void HardwareThread::Wake(const bool wakeup) noexcept {
 Bool HardwareThread::Switch(HAL::StackFramePtr frame) {
   this->fStack = frame;
 
-  Bool ret = mp_register_process(fStack, this->fPID);
+  Bool ret = mp_register_task(fStack, this->fPID);
 
   return ret;
 }
diff --git a/dev/kernel/src/UserProcessScheduler.cc b/dev/kernel/src/UserProcessScheduler.cc
index 0de38532..a901e6d0 100644
--- a/dev/kernel/src/UserProcessScheduler.cc
+++ b/dev/kernel/src/UserProcessScheduler.cc
@@ -21,6 +21,7 @@
 #include <KernelKit/ProcessScheduler.h>
 #include <NewKit/KString.h>
 #include <SignalKit/Signals.h>
+#include "NewKit/Macros.h"
 
 ///! BUGS: 0
 
@@ -125,7 +126,7 @@ ErrorOr<VoidPtr> USER_PROCESS::New(SizeT sz, SizeT pad_amount) {
   if (this->UsedMemory > kSchedMaxMemoryLimit) return ErrorOr<VoidPtr>(-kErrorHeapOutOfMemory);
 
 #ifdef __NE_VIRTUAL_MEMORY_SUPPORT__
-  auto vm_register = kKernelCR3;
+  auto vm_register = kKernelVM;
   hal_write_cr3(this->VMRegister);
 
   auto ptr = mm_new_ptr(sz, Yes, Yes, pad_amount);
@@ -271,7 +272,7 @@ Void USER_PROCESS::Exit(const Int32& exit_code) {
   auto memory_ptr_list = this->HeapTree;
 
 #ifdef __NE_VIRTUAL_MEMORY_SUPPORT__
-  auto pd = kKernelCR3;
+  auto pd = kKernelVM;
   hal_write_cr3(this->VMRegister);
 #endif
 
@@ -384,7 +385,7 @@ ProcessID UserProcessScheduler::Spawn(const Char* name, VoidPtr code, VoidPtr im
   rt_copy_memory(reinterpret_cast<VoidPtr>(const_cast<Char*>(name)), process.Name, len);
 
 #ifdef __NE_VIRTUAL_MEMORY_SUPPORT__
-  process.VMRegister = kKernelCR3;
+  process.VMRegister = kKernelVM;
 #else
   process.VMRegister = 0UL;
 #endif  // ifdef __NE_VIRTUAL_MEMORY_SUPPORT__
@@ -401,6 +402,15 @@ ProcessID UserProcessScheduler::Spawn(const Char* name, VoidPtr code, VoidPtr im
   process.StackFrame->IP = reinterpret_cast<UIntPtr>(code);
   process.StackFrame->SP = reinterpret_cast<UIntPtr>(&process.StackReserve[0] + process.StackSize);
 
+#ifdef __NE_VIRTUAL_MEMORY_SUPPORT__
+  HAL::mm_map_page((VoidPtr) process.StackFrame->IP,
+                   (VoidPtr) HAL::mm_get_phys_address((VoidPtr) process.StackFrame->IP),
+                   HAL::kMMFlagsUser | HAL::kMMFlagsPresent);
+  HAL::mm_map_page((VoidPtr) process.StackFrame->SP,
+                   (VoidPtr) HAL::mm_get_phys_address((VoidPtr) process.StackFrame->SP),
+                   HAL::kMMFlagsUser | HAL::kMMFlagsPresent);
+#endif  // ifdef __NE_VIRTUAL_MEMORY_SUPPORT__
+
   process.StackSize = kSchedMaxStackSz;
 
   rt_set_memory(process.StackReserve, 0, process.StackSize);
@@ -494,6 +504,8 @@ SizeT UserProcessScheduler::Run() noexcept {
     if (UserProcessHelper::CanBeScheduled(process)) {
       kout << process.Name << " will be scheduled...\r";
 
+      this->TheCurrentProcess() = process;
+
       if (UserProcessHelper::Switch(process.StackFrame, process.ProcessId)) {
         process.PTime = static_cast<Int32>(process.Affinity);
 
@@ -606,6 +618,7 @@ Bool UserProcessHelper::Switch(HAL::StackFramePtr frame_ptr, PID new_pid) {
     if (HardwareThreadScheduler::The()[index].Leak()->IsBusy()) {
       (Void)(kout << "AP_" << hex_number(index));
       kout << " is busy\r";
+
       continue;
     }
 
@@ -627,10 +640,6 @@ Bool UserProcessHelper::Switch(HAL::StackFramePtr frame_ptr, PID new_pid) {
 
     HardwareThreadScheduler::The()[index].Leak()->fPTime =
         UserProcessScheduler::The().TheCurrentTeam().AsArray()[new_pid].PTime;
-    HardwareThreadScheduler::The()[index].Leak()->Wake(YES);
-
-    UserProcessScheduler::The().TheCurrentProcess() =
-        UserProcessScheduler::The().TheCurrentTeam().AsArray()[new_pid];
 
     return YES;
   }
-- 
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