L2_L_OFFSET
*pa = (pte & L2_L_FRAME) | (va & L2_L_OFFSET);
return (L2_L_SIZE - (va & L2_L_OFFSET));
pa = (pte & L2_L_FRAME) | (va & L2_L_OFFSET);
((((va) | (pa)) & L2_L_OFFSET) == 0 && (size) >= L2_L_SIZE)
#define L2_L_FRAME (~L2_L_OFFSET)
pageOffset = va & L2_L_OFFSET;
#define round_L_page(x) (((x) + L2_L_OFFSET) & L2_L_FRAME)
#define round_L_page(x) (((x) + L2_L_OFFSET) & L2_L_FRAME)