Kernel: Rework physical memory allocation

PhysicalRange is now much simpler bitmap. This makes expanding
PhysicalRange API much easier.

kernel/include/kernel/Memory/PhysicalRange.h

@@ -3,7 +3,6 @@
 #include <kernel/Memory/Types.h>
 
 #include <stddef.h>
-#include <stdint.h>
 
 namespace Kernel
 {
@@ -12,42 +11,37 @@ namespace Kernel
 	{
 	public:
 		PhysicalRange(paddr_t, size_t);
+
 		paddr_t reserve_page();
 		void release_page(paddr_t);
 
+		paddr_t reserve_contiguous_pages(size_t pages);
+		void release_contiguous_pages(paddr_t paddr, size_t pages);
+
 		paddr_t start() const { return m_paddr; }
 		paddr_t end() const { return m_paddr + m_size; }
 		bool contains(paddr_t addr) const { return m_paddr <= addr && addr < m_paddr + m_size; }
 
-		size_t usable_memory() const { return m_reservable_pages * PAGE_SIZE; }
+		size_t usable_memory() const { return m_data_pages * PAGE_SIZE; }
 
-		size_t used_pages() const { return m_used_pages; }
+		size_t used_pages() const { return m_data_pages - m_free_pages; }
 		size_t free_pages() const { return m_free_pages; }
 
 	private:
-		struct node
-		{
-			node* next;
-			node* prev;
-		};
+		unsigned long long* ull_bitmap_ptr() { return (unsigned long long*)m_vaddr; }
 		
-		paddr_t page_address(const node*) const;
-		node* node_address(paddr_t) const;
+		paddr_t paddr_for_bit(unsigned long long) const;
+		unsigned long long bit_for_paddr(paddr_t paddr) const;
 
 	private:
-		paddr_t m_paddr	{ 0 };
+		const paddr_t m_paddr { 0 };
+		const size_t m_size	{ 0 };
+
 		vaddr_t m_vaddr { 0 };
-		size_t m_size	{ 0 };
 
-		uint64_t m_total_pages		{ 0 };
-		uint64_t m_reservable_pages	{ 0 };
-		uint64_t m_list_pages		{ 0 };
-
-		size_t m_used_pages { 0 };
+		const size_t m_bitmap_pages { 0 };
+		const size_t m_data_pages { 0 };
 		size_t m_free_pages { 0 };
-
-		node* m_free_list { nullptr };
-		node* m_used_list { nullptr };
 	};
 
 }