IXL_HMC_PGS
count = (npages > IXL_HMC_PGS) ? IXL_HMC_PGS : npages;
npages -= IXL_HMC_PGS;
#define IXL_HMC_L2SZ (IXL_HMC_PGSIZE * IXL_HMC_PGS)