18dabf473e
Change the page member of the scatterlist structure to be an unsigned long, and encode more stuff in the lower bits: - Bits 0 and 1 zero: this is a normal sg entry. Next sg entry is located at sg + 1. - Bit 0 set: this is a chain entry, the next real entry is at ->page_link with the two low bits masked off. - Bit 1 set: this is the final entry in the sg entry. sg_next() will return NULL when passed such an entry. It's thus important that sg table users use the proper accessors to get and set the page member. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
29 lines
631 B
C
29 lines
631 B
C
/*
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* include/asm-v850/scatterlist.h
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*
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* Copyright (C) 2001,02 NEC Corporation
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* Copyright (C) 2001,02 Miles Bader <miles@gnu.org>
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file COPYING in the main directory of this
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* archive for more details.
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*
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* Written by Miles Bader <miles@gnu.org>
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*/
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#ifndef __V850_SCATTERLIST_H__
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#define __V850_SCATTERLIST_H__
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#include <asm/types.h>
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struct scatterlist {
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unsigned long page_link;
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unsigned offset;
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dma_addr_t dma_address;
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unsigned length;
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};
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#define ISA_DMA_THRESHOLD (~0UL)
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#endif /* __V850_SCATTERLIST_H__ */
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