LXR linux/arch/ia64/include/asm/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
  11struct 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 */
  39