LXR linux/arch/xtensa/include/asm/scatterlist.h

   1/*
   2 * include/asm-xtensa/scatterlist.h
   3 *
   4 * This file is subject to the terms and conditions of the GNU General Public
   5 * License.  See the file "COPYING" in the main directory of this archive
   6 * for more details.
   7 *
   8 * Copyright (C) 2001 - 2005 Tensilica Inc.
   9 */
  10
  11#ifndef _XTENSA_SCATTERLIST_H
  12#define _XTENSA_SCATTERLIST_H
  13
  14#include <asm/types.h>
  15
  16struct scatterlist {
  17#ifdef CONFIG_DEBUG_SG
  18        unsigned long   sg_magic;
  19#endif
  20        unsigned long   page_link;
  21        unsigned int    offset;
  22        dma_addr_t      dma_address;
  23        unsigned int    length;
  24};
  25
  26/*
  27 * These macros should be used after a pci_map_sg call has been done
  28 * to get bus addresses of each of the SG entries and their lengths.
  29 * You should only work with the number of sg entries pci_map_sg
  30 * returns, or alternatively stop on the first sg_dma_len(sg) which
  31 * is 0.
  32 */
  33#define sg_dma_address(sg)      ((sg)->dma_address)
  34#define sg_dma_len(sg)          ((sg)->length)
  35
  36
  37#define ISA_DMA_THRESHOLD (~0UL)
  38
  39#endif  /* _XTENSA_SCATTERLIST_H */
  40