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-rw-r--r--include/asm-ia64/scatterlist.h28
1 files changed, 28 insertions, 0 deletions
diff --git a/include/asm-ia64/scatterlist.h b/include/asm-ia64/scatterlist.h
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+++ b/include/asm-ia64/scatterlist.h
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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
+ */
+
+struct scatterlist {
+ struct page *page;
+ 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
+
+#endif /* _ASM_IA64_SCATTERLIST_H */