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 #ifdef CONFIG_DEBUG_SG
  13         unsigned long sg_magic;
  14 #endif
  15         unsigned long page_link;
  16         unsigned int offset;
  17         unsigned int length;    /* buffer length */
  18
  19         dma_addr_t dma_address;
  20         unsigned int dma_length;
  21 };
  22
  23 /*
  24  * It used to be that ISA_DMA_THRESHOLD had something to do with the
  25  * DMA-limits of ISA-devices.  Nowadays, its only remaining use (apart
  26  * from the aha1542.c driver, which isn't 64-bit clean anyhow) is to
  27  * tell the block-layer (via BLK_BOUNCE_ISA) what the max. physical
  28  * address of a page is that is allocated with GFP_DMA.  On IA-64,
  29  * that's 4GB - 1.
  30  */
  31 #define ISA_DMA_THRESHOLD       0xffffffff
  32
  33 #define sg_dma_len(sg)          ((sg)->dma_length)
  34 #define sg_dma_address(sg)      ((sg)->dma_address)
  35
  36 #define ARCH_HAS_SG_CHAIN
  37
  38 #endif /* _ASM_IA64_SCATTERLIST_H */