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