DMAP_MIN_PHYSADDR
mdhdr.dmapphys = DMAP_MIN_PHYSADDR;
#define PHYS_IN_DMAP_RANGE(pa) ((pa) >= DMAP_MIN_PHYSADDR && \
DMAP_MIN_PHYSADDR, /* highaddr */
#define PHYS_IN_DMAP(pa) ((pa) >= DMAP_MIN_PHYSADDR && \
mdhdr.dmapphys = DMAP_MIN_PHYSADDR;