#pragma once
#include "../types.h"

namespace Core {
/*! \brief Protection Rings
 */
namespace Ring {

/*! \brief Switch to Ring 3
 *
 * \param stackpointer       usermode stack pointer
 * \param kickoff            pointer to function in user mode
 * \param kickoff_parameter  put in register for 1. function parameter
 */
[[gnu::noreturn]]
void switchToUsermode(void *stackpointer, void *kickoff,
					  void *kickoff_parameter);

/*! \brief Get current protection level
 *
 *  \return current ring
 */
inline unsigned get() {
	unsigned cs;
	asm volatile("mov %%cs, %0\n\t" : "=r"(cs)::"memory");
	return cs & 0b11;  // last bits define the ring
}

}  // namespace Ring
}  // namespace Core