mirror of https://gitee.com/openkylin/qemu.git
67 lines
2.0 KiB
C
67 lines
2.0 KiB
C
/*
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* DMA helper functions
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*
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* Copyright (c) 2009 Red Hat
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*
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* This work is licensed under the terms of the GNU General Public License
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* (GNU GPL), version 2 or later.
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*/
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#ifndef DMA_H
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#define DMA_H
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#include <stdio.h>
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#include "hw/hw.h"
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#include "block.h"
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typedef struct ScatterGatherEntry ScatterGatherEntry;
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typedef enum {
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DMA_DIRECTION_TO_DEVICE = 0,
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DMA_DIRECTION_FROM_DEVICE = 1,
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} DMADirection;
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struct QEMUSGList {
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ScatterGatherEntry *sg;
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int nsg;
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int nalloc;
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size_t size;
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};
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#if defined(TARGET_PHYS_ADDR_BITS)
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typedef target_phys_addr_t dma_addr_t;
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#define DMA_ADDR_FMT TARGET_FMT_plx
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struct ScatterGatherEntry {
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dma_addr_t base;
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dma_addr_t len;
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};
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void qemu_sglist_init(QEMUSGList *qsg, int alloc_hint);
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void qemu_sglist_add(QEMUSGList *qsg, dma_addr_t base, dma_addr_t len);
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void qemu_sglist_destroy(QEMUSGList *qsg);
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#endif
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typedef BlockDriverAIOCB *DMAIOFunc(BlockDriverState *bs, int64_t sector_num,
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QEMUIOVector *iov, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque);
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BlockDriverAIOCB *dma_bdrv_io(BlockDriverState *bs,
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QEMUSGList *sg, uint64_t sector_num,
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DMAIOFunc *io_func, BlockDriverCompletionFunc *cb,
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void *opaque, DMADirection dir);
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BlockDriverAIOCB *dma_bdrv_read(BlockDriverState *bs,
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QEMUSGList *sg, uint64_t sector,
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BlockDriverCompletionFunc *cb, void *opaque);
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BlockDriverAIOCB *dma_bdrv_write(BlockDriverState *bs,
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QEMUSGList *sg, uint64_t sector,
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BlockDriverCompletionFunc *cb, void *opaque);
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uint64_t dma_buf_read(uint8_t *ptr, int32_t len, QEMUSGList *sg);
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uint64_t dma_buf_write(uint8_t *ptr, int32_t len, QEMUSGList *sg);
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void dma_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie,
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QEMUSGList *sg, enum BlockAcctType type);
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#endif
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