Kernel: Per processor information is now stored in class Processor

This allows us to allocate processor stacks, and other per processor
structures dynamically in runtime. Giving processor stack to
ap_trampoline feels super hacky, but it works for now.

kernel/kernel/Processor.cpp

@@ -0,0 +1,34 @@
+#include <BAN/Vector.h>
+#include <kernel/Processor.h>
+
+namespace Kernel
+{
+
+	static BAN::Vector<Processor> s_processors;
+
+	Processor& Processor::create(ProcessorID id)
+	{
+		while (s_processors.size() <= id)
+			MUST(s_processors.emplace_back());
+		auto& processor = s_processors[id];
+		if (processor.m_stack == nullptr)
+		{
+			processor.m_stack = kmalloc(m_stack_size, 4096, true);
+			ASSERT(processor.m_stack);
+		}
+		return processor;
+	}
+
+	Processor::~Processor()
+	{
+		if (m_stack)
+			kfree(m_stack);
+		m_stack = nullptr;
+	}
+
+	Processor& Processor::get(ProcessorID id)
+	{
+		return s_processors[id];
+	}
+
+}