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dma.h

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/*!     \file include/kernel/dma.h
 *      \brief DMA (Direct Memory Access) driver header.
 *      \author Andrea Righi <drizzt@inwind.it>
 *      \date Last update: 2003-11-08
 *      \note Copyright (&copy;) 2003 Andrea Righi
 */

#ifndef DMA_H
#define DMA_H

//! A structure used to store hardware definition of DMA channels.
typedef struct dma_channel
{
        uint8_t page;     //!< Page register.
        uint8_t offset;   //!< Offset register.
        uint8_t length;   //!< Length register.
} dma_channel_t;

// --- Prototypes ----------------------------------------------------- //

void dma_xfer(unsigned channel, addr_t physaddr, size_t length, bool read);
void dma_alloc_init();
void *dma_phys_alloc(size_t len);
bool dma_phys_free(size_t dma_start, size_t len);
// (Removed) dword dma_pop_frame();
// (Removed) void dma_push_frame(dword dma_p_addr);

#endif

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