#ifndef __ASM_GENERIC_DMA_H
  #define __ASM_GENERIC_DMA_H
  /*
   * This file traditionally describes the i8237 PC style DMA controller.
   * Most architectures don't have these any more and can get the minimal
   * implementation from kernel/dma.c by not defining MAX_DMA_CHANNELS.
   *
   * Some code relies on seeing MAX_DMA_ADDRESS though.
   */
  #define MAX_DMA_ADDRESS PAGE_OFFSET
  
  extern int request_dma(unsigned int dmanr, const char *device_id);
  extern void free_dma(unsigned int dmanr);
  
  #endif /* __ASM_GENERIC_DMA_H */