/* ISA bus */extern target_phys_addr_t isa_mem_base;int register_ioport_read(int start, int length, int size,                         IOPortReadFunc *func, void *opaque);int register_ioport_write(int start, int length, int size,                          IOPortWriteFunc *func, void *opaque);void isa_unassign_ioport(int start, int length);void isa_mmio_init(target_phys_addr_t base, target_phys_addr_t size);/* dma.c */int DMA_get_channel_mode (int nchan);int DMA_read_memory (int nchan, void *buf, int pos, int size);int DMA_write_memory (int nchan, void *buf, int pos, int size);void DMA_hold_DREQ (int nchan);void DMA_release_DREQ (int nchan);void DMA_schedule(int nchan);void DMA_run (void);void DMA_init (int high_page_enable);void DMA_register_channel (int nchan,                           DMA_transfer_handler transfer_handler,                           void *opaque);