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Jens Axboe
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>
48 lines
1.2 KiB
C
48 lines
1.2 KiB
C
#ifndef _ASM_POWERPC_SCATTERLIST_H
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#define _ASM_POWERPC_SCATTERLIST_H
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/*
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* Copyright (C) 2001 PPC64 Team, IBM Corp
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifdef __KERNEL__
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#include <linux/types.h>
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#include <asm/dma.h>
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struct scatterlist {
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unsigned long page_link;
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unsigned int offset;
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unsigned int length;
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/* For TCE support */
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dma_addr_t dma_address;
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u32 dma_length;
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};
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/*
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* These macros should be used after a dma_map_sg call has been done
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* to get bus addresses of each of the SG entries and their lengths.
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* You should only work with the number of sg entries pci_map_sg
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* returns, or alternatively stop on the first sg_dma_len(sg) which
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* is 0.
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*/
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#define sg_dma_address(sg) ((sg)->dma_address)
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#ifdef __powerpc64__
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#define sg_dma_len(sg) ((sg)->dma_length)
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#else
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#define sg_dma_len(sg) ((sg)->length)
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#endif
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#ifdef __powerpc64__
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#define ISA_DMA_THRESHOLD (~0UL)
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#endif
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#define ARCH_HAS_SG_CHAIN
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_SCATTERLIST_H */
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