include/asm-x86/scatterlist.h

   1 #ifndef _ASM_X86_SCATTERLIST_H
   2 #define _ASM_X86_SCATTERLIST_H
   3
   4 #include <asm/types.h>
   5
   6 struct scatterlist {
   7 #ifdef CONFIG_DEBUG_SG
   8         unsigned long   sg_magic;
   9 #endif
  10         unsigned long   page_link;
  11         unsigned int    offset;
  12         unsigned int    length;
  13         dma_addr_t      dma_address;
  14         unsigned int    dma_length;
  15 };
  16
  17 #define ARCH_HAS_SG_CHAIN
  18 #define ISA_DMA_THRESHOLD (0x00ffffff)
  19
  20 /*
  21  * These macros should be used after a pci_map_sg call has been done
  22  * to get bus addresses of each of the SG entries and their lengths.
  23  * You should only work with the number of sg entries pci_map_sg
  24  * returns.
  25  */
  26 #define sg_dma_address(sg)      ((sg)->dma_address)
  27 #ifdef CONFIG_X86_32
  28 # define sg_dma_len(sg)         ((sg)->length)
  29 #else
  30 # define sg_dma_len(sg)         ((sg)->dma_length)
  31 #endif
  32
  33 #endif