vm: add map_self() method to utils::shm

Add complementary unmap_self() method.
Move VirtualMemory to util/vm.hpp
Minor associated include cleanup.
Move asm.h to util/asm.hpp

Utilities/VirtualMemory.h

@@ -1,88 +0,0 @@
-#pragma once
-
-#include "types.h"
-
-namespace utils
-{
-	// Memory protection type
-	enum class protection
-	{
-		rw, // Read + write (default)
-		ro, // Read only
-		no, // No access
-		wx, // Read + write + execute
-		rx, // Read + execute
-	};
-
-	/**
-	* Reserve `size` bytes of virtual memory and returns it.
-	* The memory should be commited before usage.
-	*/
-	void* memory_reserve(std::size_t size, void* use_addr = nullptr);
-
-	/**
-	* Commit `size` bytes of virtual memory starting at pointer.
-	* That is, bake reserved memory with physical memory.
-	* pointer should belong to a range of reserved memory.
-	*/
-	void memory_commit(void* pointer, std::size_t size, protection prot = protection::rw);
-
-	// Decommit all memory committed via commit_page_memory.
-	void memory_decommit(void* pointer, std::size_t size);
-
-	// Decommit all memory and commit it again.
-	void memory_reset(void* pointer, std::size_t size, protection prot = protection::rw);
-
-	// Free memory after reserved by memory_reserve, should specify original size
-	void memory_release(void* pointer, std::size_t size);
-
-	// Set memory protection
-	void memory_protect(void* pointer, std::size_t size, protection prot);
-
-	// Shared memory handle
-	class shm
-	{
-#ifdef _WIN32
-		void* m_handle;
-#else
-		int m_file;
-#endif
-		u32 m_size;
-		u32 m_flags;
-
-	public:
-		explicit shm(u32 size, u32 flags = 0);
-
-		shm(const shm&) = delete;
-
-		shm& operator=(const shm&) = delete;
-
-		~shm();
-
-		// Map shared memory
-		u8* map(void* ptr, protection prot = protection::rw) const;
-
-		// Map shared memory over reserved memory region, which is unsafe (non-atomic) under Win32
-		u8* map_critical(void* ptr, protection prot = protection::rw);
-
-		// Unmap shared memory
-		void unmap(void* ptr) const;
-
-		// Unmap shared memory, undoing map_critical
-		void unmap_critical(void* ptr);
-
-		u32 size() const
-		{
-			return m_size;
-		}
-
-		// Flags are unspecified, consider it userdata
-		u32 flags() const
-		{
-			return m_flags;
-		}
-
-		// Another userdata
-		u64 info = 0;
-	};
-}