include/asm-ia64/scatterlist.h

   1 #ifndef _ASM_IA64_SCATTERLIST_H
   2 #define _ASM_IA64_SCATTERLIST_H
   3
   4 /*
   5  * Modified 1998-1999, 2001-2002, 2004
   6  *      David Mosberger-Tang <davidm@hpl.hp.com>, Hewlett-Packard Co
   7  */
   8
   9 struct scatterlist {
  10         struct page *page;
  11         unsigned int offset;
  12         unsigned int length;    /* buffer length */
  13
  14         dma_addr_t dma_address;
  15         unsigned int dma_length;
  16 };
  17
  18 /*
  19  * It used to be that ISA_DMA_THRESHOLD had something to do with the
  20  * DMA-limits of ISA-devices.  Nowadays, its only remaining use (apart
  21  * from the aha1542.c driver, which isn't 64-bit clean anyhow) is to
  22  * tell the block-layer (via BLK_BOUNCE_ISA) what the max. physical
  23  * address of a page is that is allocated with GFP_DMA.  On IA-64,
  24  * that's 4GB - 1.
  25  */
  26 #define ISA_DMA_THRESHOLD       0xffffffff
  27
  28 #define sg_dma_len(sg)          ((sg)->dma_length)
  29 #define sg_dma_address(sg)      ((sg)->dma_address)
  30
  31 #endif /* _ASM_IA64_SCATTERLIST_H */