pv_addrqh_t
pv_addrqh_t pmap_boot_freeq = SLIST_HEAD_INITIALIZER(&pmap_boot_freeq);
pv_addrqh_t bmi_freechunks;
pv_addrqh_t bmi_chunks; /* sorted list of memory to be mapped */
extern pv_addrqh_t pmap_freeq;