dma.h 514 B

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  1. #ifndef __ASM_GENERIC_DMA_H
  2. #define __ASM_GENERIC_DMA_H
  3. /*
  4. * This file traditionally describes the i8237 PC style DMA controller.
  5. * Most architectures don't have these any more and can get the minimal
  6. * implementation from kernel/dma.c by not defining MAX_DMA_CHANNELS.
  7. *
  8. * Some code relies on seeing MAX_DMA_ADDRESS though.
  9. */
  10. #define MAX_DMA_ADDRESS PAGE_OFFSET
  11. extern int request_dma(unsigned int dmanr, const char *device_id);
  12. extern void free_dma(unsigned int dmanr);
  13. #endif /* __ASM_GENERIC_DMA_H */