SG64ENTRY
struct SG64ENTRY sg64entry[1];
struct SG64ENTRY *pdma_sg = (struct SG64ENTRY *)psge;
psge += sizeof (struct SG64ENTRY);
arccdbsize += sizeof (struct SG64ENTRY);
roundup_ccbsize = roundup(sizeof(struct CommandControlBlock) + (max_sg_entrys - 1) * sizeof(struct SG64ENTRY), 32);