T_DATA_MMU_MISS
if (type == T_DATA_MMU_MISS && addr < (caddr_t)KERNELBASE) {
case T_DATA_MMU_MISS + T_USER:
case T_DATA_MMU_MISS:
case T_DATA_MMU_MISS + T_USER:
case T_DATA_MMU_MISS: /* system data mmu miss */
case T_DATA_MMU_MISS:
case T_DATA_MMU_MISS + T_USER: /* user data mmu miss */
case T_DATA_MMU_MISS + T_USER: