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 #include <asm/types.h>
  10
  11 struct scatterlist {
  12         struct page *page;
  13         unsigned int offset;
  14         unsigned int length;    /* buffer length */
  15
  16         dma_addr_t dma_address;
  17         unsigned int dma_length;
  18 };
  19
  20 /*
  21  * It used to be that ISA_DMA_THRESHOLD had something to do with the
  22  * DMA-limits of ISA-devices.  Nowadays, its only remaining use (apart
  23  * from the aha1542.c driver, which isn't 64-bit clean anyhow) is to
  24  * tell the block-layer (via BLK_BOUNCE_ISA) what the max. physical
  25  * address of a page is that is allocated with GFP_DMA.  On IA-64,
  26  * that's 4GB - 1.
  27  */
  28 #define ISA_DMA_THRESHOLD       0xffffffff
  29
  30 #define sg_dma_len(sg)          ((sg)->dma_length)
  31 #define sg_dma_address(sg)      ((sg)->dma_address)
  32
  33 #endif /* _ASM_IA64_SCATTERLIST_H */