qemu/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 "block.h"
  16
  17 typedef struct {
  18     target_phys_addr_t base;
  19     target_phys_addr_t len;
  20 } ScatterGatherEntry;
  21
  22 typedef struct {
  23     ScatterGatherEntry *sg;
  24     int nsg;
  25     int nalloc;
  26     target_phys_addr_t size;
  27 } QEMUSGList;
  28
  29 void qemu_sglist_init(QEMUSGList *qsg, int alloc_hint);
  30 void qemu_sglist_add(QEMUSGList *qsg, target_phys_addr_t base,
  31                      target_phys_addr_t len);
  32 void qemu_sglist_destroy(QEMUSGList *qsg);
  33
  34 BlockDriverAIOCB *dma_bdrv_read(BlockDriverState *bs,
  35                                 QEMUSGList *sg, uint64_t sector,
  36                                 BlockDriverCompletionFunc *cb, void *opaque);
  37 BlockDriverAIOCB *dma_bdrv_write(BlockDriverState *bs,
  38                                  QEMUSGList *sg, uint64_t sector,
  39                                  BlockDriverCompletionFunc *cb, void *opaque);
  40 void dma_helper_init(void);
  41
  42 #endif