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 {
  19     target_phys_addr_t base;
  20     target_phys_addr_t len;
  21 } ScatterGatherEntry;
  22
  23 struct QEMUSGList {
  24     ScatterGatherEntry *sg;
  25     int nsg;
  26     int nalloc;
  27     target_phys_addr_t size;
  28 };
  29
  30 void qemu_sglist_init(QEMUSGList *qsg, int alloc_hint);
  31 void qemu_sglist_add(QEMUSGList *qsg, target_phys_addr_t base,
  32                      target_phys_addr_t len);
  33 void qemu_sglist_destroy(QEMUSGList *qsg);
  34
  35 typedef BlockDriverAIOCB *DMAIOFunc(BlockDriverState *bs, int64_t sector_num,
  36                                  QEMUIOVector *iov, int nb_sectors,
  37                                  BlockDriverCompletionFunc *cb, void *opaque);
  38
  39 BlockDriverAIOCB *dma_bdrv_io(BlockDriverState *bs,
  40                               QEMUSGList *sg, uint64_t sector_num,
  41                               DMAIOFunc *io_func, BlockDriverCompletionFunc *cb,
  42                               void *opaque, int is_write);
  43 BlockDriverAIOCB *dma_bdrv_read(BlockDriverState *bs,
  44                                 QEMUSGList *sg, uint64_t sector,
  45                                 BlockDriverCompletionFunc *cb, void *opaque);
  46 BlockDriverAIOCB *dma_bdrv_write(BlockDriverState *bs,
  47                                  QEMUSGList *sg, uint64_t sector,
  48                                  BlockDriverCompletionFunc *cb, void *opaque);
  49 #endif