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- #ifndef _ASM_IA64_SCATTERLIST_H
- #define _ASM_IA64_SCATTERLIST_H
- /*
- * Modified 1998-1999, 2001-2002, 2004
- * David Mosberger-Tang <davidm@hpl.hp.com>, Hewlett-Packard Co
- */
- #include <asm/types.h>
- struct scatterlist {
- #ifdef CONFIG_DEBUG_SG
- unsigned long sg_magic;
- #endif
- unsigned long page_link;
- unsigned int offset;
- unsigned int length; /* buffer length */
- dma_addr_t dma_address;
- unsigned int dma_length;
- };
- /*
- * It used to be that ISA_DMA_THRESHOLD had something to do with the
- * DMA-limits of ISA-devices. Nowadays, its only remaining use (apart
- * from the aha1542.c driver, which isn't 64-bit clean anyhow) is to
- * tell the block-layer (via BLK_BOUNCE_ISA) what the max. physical
- * address of a page is that is allocated with GFP_DMA. On IA-64,
- * that's 4GB - 1.
- */
- #define ISA_DMA_THRESHOLD 0xffffffff
- #define sg_dma_len(sg) ((sg)->dma_length)
- #define sg_dma_address(sg) ((sg)->dma_address)
- #define ARCH_HAS_SG_CHAIN
- #endif /* _ASM_IA64_SCATTERLIST_H */
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