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

namespace Page {
/*! \brief Page Bits
 * We use the least significant 12 Bits
 */
const uintptr_t BITS = 12;

/*! \brief Page size
 * We go with 2^12 = 4K
 */
const uintptr_t SIZE = 1 << BITS;

/*! \brief Mask for Page
 */
const uintptr_t MASK = SIZE - 1;

/*! \brief Round to next (upper) page aligned address
 *  \param address memory address
 *  \return nearest ceiling page aligned address
 */
template <typename T>
T ceil(T address) {
	return (address + MASK) & (~MASK);
}

/*! \brief Round to last (lower) page aligned address
 *  \param address memory address
 *  \return nearest floor page aligned address
 */
template <typename T>
T floor(T ptr) {
	return ptr & (~MASK);
}

/*! \brief Get offset in page
 *  \param address memory address
 *  \return offset
 */
template <typename T>
T offset(T ptr) {
	return ptr & MASK;
}

/*! \brief Check if address is page aligned
 *  \param address memory address
 *  \return true if page aligned address
 */
template <typename T>
bool aligned(T ptr) {
	return offset(ptr) == 0;
}

}  // namespace Page