#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_OFFSETexternintrequest_dma(unsignedintdmanr,constchar*device_id);externvoidfree_dma(unsignedintdmanr);#endif /* __ASM_GENERIC_DMA_H */