include/asm-xtensa/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 struct scatterlist {
  15         struct page     *page;
  16         unsigned int    offset;
  17         dma_addr_t      dma_address;
  18         unsigned int    length;
  19 };
  20
  21 /*
  22  * These macros should be used after a pci_map_sg call has been done
  23  * to get bus addresses of each of the SG entries and their lengths.
  24  * You should only work with the number of sg entries pci_map_sg
  25  * returns, or alternatively stop on the first sg_dma_len(sg) which
  26  * is 0.
  27  */
  28 #define sg_dma_address(sg)      ((sg)->dma_address)
  29 #define sg_dma_len(sg)          ((sg)->length)
  30
  31
  32 #define ISA_DMA_THRESHOLD (~0UL)
  33
  34 #endif  /* _XTENSA_SCATTERLIST_H */