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 #ifdef CONFIG_X86_64
  15         unsigned int    dma_length;
  16 #endif
  17 };
  18
  19 #define ARCH_HAS_SG_CHAIN
  20 #define ISA_DMA_THRESHOLD (0x00ffffff)
  21
  22 /*
  23  * These macros should be used after a pci_map_sg call has been done
  24  * to get bus addresses of each of the SG entries and their lengths.
  25  * You should only work with the number of sg entries pci_map_sg
  26  * returns.
  27  */
  28 #define sg_dma_address(sg)      ((sg)->dma_address)
  29 #ifdef CONFIG_X86_32
  30 # define sg_dma_len(sg)         ((sg)->length)
  31 #else
  32 # define sg_dma_len(sg)         ((sg)->dma_length)
  33 #endif
  34
  35 #endif