dma.h

   1 /*
   2  * DMA helper functions
   3  *
   4  * Copyright (c) 2009 Red Hat
   5  *
   6  * This work is licensed under the terms of the GNU General Public License
   7  * (GNU GPL), version 2 or later.
   8  */
   9
  10 #ifndef DMA_H
  11 #define DMA_H
  12
  13 #include <stdio.h>
  14 //#include "cpu.h"
  15 #include "hw/hw.h"
  16 #include "block.h"
  17
  18 typedef struct ScatterGatherEntry ScatterGatherEntry;
  19
  20 #if defined(TARGET_PHYS_ADDR_BITS)
  21 typedef target_phys_addr_t dma_addr_t;
  22
  23 #define DMA_ADDR_FMT TARGET_FMT_plx
  24
  25 typedef enum {
  26     DMA_DIRECTION_TO_DEVICE = 0,
  27     DMA_DIRECTION_FROM_DEVICE = 1,
  28 } DMADirection;
  29
  30 struct ScatterGatherEntry {
  31     dma_addr_t base;
  32     dma_addr_t len;
  33 };
  34
  35 struct QEMUSGList {
  36     ScatterGatherEntry *sg;
  37     int nsg;
  38     int nalloc;
  39     dma_addr_t size;
  40 };
  41
  42 void qemu_sglist_init(QEMUSGList *qsg, int alloc_hint);
  43 void qemu_sglist_add(QEMUSGList *qsg, dma_addr_t base, dma_addr_t len);
  44 void qemu_sglist_destroy(QEMUSGList *qsg);
  45 #endif
  46
  47 typedef BlockDriverAIOCB *DMAIOFunc(BlockDriverState *bs, int64_t sector_num,
  48                                  QEMUIOVector *iov, int nb_sectors,
  49                                  BlockDriverCompletionFunc *cb, void *opaque);
  50
  51 BlockDriverAIOCB *dma_bdrv_io(BlockDriverState *bs,
  52                               QEMUSGList *sg, uint64_t sector_num,
  53                               DMAIOFunc *io_func, BlockDriverCompletionFunc *cb,
  54                               void *opaque, bool to_dev);
  55 BlockDriverAIOCB *dma_bdrv_read(BlockDriverState *bs,
  56                                 QEMUSGList *sg, uint64_t sector,
  57                                 BlockDriverCompletionFunc *cb, void *opaque);
  58 BlockDriverAIOCB *dma_bdrv_write(BlockDriverState *bs,
  59                                  QEMUSGList *sg, uint64_t sector,
  60                                  BlockDriverCompletionFunc *cb, void *opaque);
  61 #endif