feat(kcp, pfa): Add kcp::Spinlock class

kernel/GNUmakefile

@@ -187,6 +187,7 @@ override CXXFLAGS += \
     -std=gnu++20 \
     -fno-rtti \
     -fno-exceptions \
+    -fmodules-ts \
     $(SHARED_FLAGS)
 
 # Internal linker flags that should not be changed by the user.

kernel/src/CppLib/Spinlock.cpp

@@ -0,0 +1,17 @@
+/*
+    * Spinlock.cpp
+    * C++ Spinlock
+    * Copyright (c) 2025 Daniel Hammer
+*/
+
+#include "Spinlock.hpp"
+
+namespace kcp {
+    void Spinlock::Aquire() {
+        while (atomic_flag.test_and_set(std::memory_order_acquire));
+    }
+
+    void Spinlock::Release() {
+        atomic_flag.clear(std::memory_order_release);
+    }
+};

kernel/src/CppLib/Spinlock.hpp

@@ -0,0 +1,17 @@
+/*
+    * Spinlock.cpp
+    * C++ Spinlock
+    * Copyright (c) 2025 Daniel Hammer
+*/
+
+#pragma once
+#include <atomic>
+
+namespace kcp {
+    class Spinlock {
+        std::atomic_flag atomic_flag{ATOMIC_FLAG_INIT};
+    public:
+        void Aquire();
+        void Release();
+    };
+};

kernel/src/CppLib/Vector.hpp

@@ -7,7 +7,9 @@
 #pragma once
 #include <cstdint>
 #include <Terminal/Terminal.hpp>
+
 #include <Memory/Heap.hpp>
+
 #include <Memory/PageFrameAllocator.hpp>
 #include <Common/Panic.hpp>
 
@@ -65,13 +67,14 @@ namespace kcp
         size_t size() {
             return sz;
         }
+        
     };
 
     template<typename T>
-    class NoMallocVector : public vector<T> {
+    class noHeapVector : public vector<T> {
         size_t pages = 0;
 public:
-    NoMallocVector() {
+    noHeapVector() {
         kout << "NoMallocVector: constructor called" << Kt::newline;
         pages = 0;
         this->sz = 0;

kernel/src/Main.cpp

@@ -96,7 +96,8 @@ extern "C" void kmain() {
 #if defined (__x86_64__)
     Hal::IDTInitialize();
 #endif
-    kcp::NoMallocVector<int> hello{};
+    kcp::noHeapVector<int> hello{};
+
     hello.push_back(10);
     hello.push_back(20);
     hello.push_back(30);

kernel/src/Memory/PageFrameAllocator.cpp

@@ -10,6 +10,8 @@
 #include <Libraries/Memory.hpp>
 #include <Terminal/Terminal.hpp>
 
+#include <CppLib/Spinlock.hpp>
+
 namespace Memory {
     PageFrameAllocator::PageFrameAllocator(LargestSection section) {
         /* we need the virtual address rather than the physical address, so we call the helper */
@@ -24,6 +26,8 @@ namespace Memory {
     }
 
     void* PageFrameAllocator::Allocate() {
+        Lock.Aquire();
+
         Page* current = head.next;
         Page* prev = &head;
 
@@ -35,11 +39,15 @@ namespace Memory {
 
                 if (new_size == 0) {
                     prev->next = current->next;
+
+                    Lock.Release();
                     return (void*)current;
                 }
                 else
                 {
                     current->size -= 0x1000;
+
+                    Lock.Release();
                     return (void*)current_end_addr - 0x1000;
                 }
             }
@@ -48,6 +56,7 @@ namespace Memory {
             current = current->next;
         }
 
+        Lock.Release();
         return nullptr;
     }
 
@@ -67,11 +76,13 @@ namespace Memory {
     }
 
     void PageFrameAllocator::Free(void* ptr) {
+        Lock.Aquire();
         auto prev_next = head.next;
         head.next = (Page*)ptr;
 
         head.next->next = prev_next;
         head.next->size = 0x1000;
+        Lock.Release();
     }
 
     void PageFrameAllocator::Free(void* ptr, int n) {

kernel/src/Memory/PageFrameAllocator.hpp

@@ -7,6 +7,8 @@
 #pragma once
 #include "Memmap.hpp"
 
+#include <CppLib/Spinlock.hpp>
+
 namespace Memory {
     class PageFrameAllocator {
         struct Page {
@@ -15,7 +17,7 @@ namespace Memory {
         };
 
         Page head{};
-
+        kcp::Spinlock Lock{};
         LargestSection g_section;
 public:
         PageFrameAllocator(LargestSection section);