dma-helpers.c

   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 #include "dma.h"
  11
  12
  13 void qemu_sglist_init(QEMUSGList *qsg, int alloc_hint)
  14 {
  15     qsg->sg = qemu_malloc(alloc_hint * sizeof(ScatterGatherEntry));
  16     qsg->nsg = 0;
  17     qsg->nalloc = alloc_hint;
  18     qsg->size = 0;
  19 }
  20
  21 void qemu_sglist_add(QEMUSGList *qsg, target_phys_addr_t base,
  22                      target_phys_addr_t len)
  23 {
  24     if (qsg->nsg == qsg->nalloc) {
  25         qsg->nalloc = 2 * qsg->nalloc + 1;
  26         qsg->sg = qemu_realloc(qsg->sg, qsg->nalloc * sizeof(ScatterGatherEntry));
  27     }
  28     qsg->sg[qsg->nsg].base = base;
  29     qsg->sg[qsg->nsg].len = len;
  30     qsg->size += len;
  31     ++qsg->nsg;
  32 }
  33
  34 void qemu_sglist_destroy(QEMUSGList *qsg)
  35 {
  36     qemu_free(qsg->sg);
  37 }
  38