EXCA_MEM_PAGESIZE
sc->mem[win].realsize = sc->mem[win].size + EXCA_MEM_PAGESIZE - 1;
(sc->mem[win].realsize % EXCA_MEM_PAGESIZE);
sc->mem[win].cardaddr = rounddown2(cardaddr, EXCA_MEM_PAGESIZE);
delta = cardaddr % EXCA_MEM_PAGESIZE;
EXCA_MEM_PAGESIZE - 1;
(sc->mem[win].realsize % EXCA_MEM_PAGESIZE);