#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 */