L2_L_FRAME
*pa = (pte & L2_L_FRAME) | (va & L2_L_OFFSET);
pa = (pte & L2_L_FRAME) | (va & L2_L_OFFSET);
pa &= L2_L_FRAME;
#define round_L_page(x) (((x) + L2_L_OFFSET) & L2_L_FRAME)
#define round_L_page(x) (((x) + L2_L_OFFSET) & L2_L_FRAME)