Archipelago » qemu

/*

 * DMA helper functions

 *

 * Copyright (c) 2009 Red Hat

 *

 * This work is licensed under the terms of the GNU General Public License

 * (GNU GPL), version 2 or later.

 */

#ifndef DMA_H

#define DMA_H

#include <stdio.h>

#include "hw/hw.h"

#include "block.h"

typedef struct ScatterGatherEntry ScatterGatherEntry;

typedef enum {

    DMA_DIRECTION_TO_DEVICE = 0,

    DMA_DIRECTION_FROM_DEVICE = 1,

} DMADirection;

struct QEMUSGList {

    ScatterGatherEntry *sg;

    int nsg;

    int nalloc;

    size_t size;

};

#if defined(TARGET_PHYS_ADDR_BITS)

typedef target_phys_addr_t dma_addr_t;

#define DMA_ADDR_FMT TARGET_FMT_plx

struct ScatterGatherEntry {

    dma_addr_t base;

    dma_addr_t len;

};

void qemu_sglist_init(QEMUSGList *qsg, int alloc_hint);

void qemu_sglist_add(QEMUSGList *qsg, dma_addr_t base, dma_addr_t len);

void qemu_sglist_destroy(QEMUSGList *qsg);

#endif

typedef BlockDriverAIOCB *DMAIOFunc(BlockDriverState *bs, int64_t sector_num,

                                 QEMUIOVector *iov, int nb_sectors,

                                 BlockDriverCompletionFunc *cb, void *opaque);

BlockDriverAIOCB *dma_bdrv_io(BlockDriverState *bs,

                              QEMUSGList *sg, uint64_t sector_num,

                              DMAIOFunc *io_func, BlockDriverCompletionFunc *cb,

                              void *opaque, DMADirection dir);

BlockDriverAIOCB *dma_bdrv_read(BlockDriverState *bs,

                                QEMUSGList *sg, uint64_t sector,

                                BlockDriverCompletionFunc *cb, void *opaque);

BlockDriverAIOCB *dma_bdrv_write(BlockDriverState *bs,

                                 QEMUSGList *sg, uint64_t sector,

                                 BlockDriverCompletionFunc *cb, void *opaque);

uint64_t dma_buf_read(uint8_t *ptr, int32_t len, QEMUSGList *sg);

uint64_t dma_buf_write(uint8_t *ptr, int32_t len, QEMUSGList *sg);

void dma_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie,

                    QEMUSGList *sg, enum BlockAcctType type);

#endif