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Take a guess and initialize the prefetch threshold to 256 bytes. Haven't

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found this one in the manual yet.
This commit is contained in:
thorpej 2001-07-19 19:09:22 +00:00
parent b0256ef005
commit 13e63c6a43
1 changed files with 8 additions and 1 deletions
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9
sys/arch/alpha/pci/tsp_dma.c
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@ -1,4 +1,4 @@
/* $NetBSD: tsp_dma.c,v 1.3 2001/01/03 19:16:00 thorpej Exp $ */
/* $NetBSD: tsp_dma.c,v 1.4 2001/07/19 19:09:22 thorpej Exp $ */
/*-
* Copyright (c) 1999 by Ross Harvey. All rights reserved.
@ -108,6 +108,12 @@ void tsp_bus_dmamap_unload_sgmap __P((bus_dma_tag_t, bus_dmamap_t));
void tsp_tlb_invalidate __P((struct tsp_config *));
/*
* XXX Need to figure out what this is, if any. Initialize it to
* XXX something that should be safe.
*/
#define TSP_SGMAP_PFTHRESH 256
void
tsp_dma_init(pcp)
struct tsp_config *pcp;
@ -176,6 +182,7 @@ tsp_dma_init(pcp)
t->_next_window = NULL;
t->_boundary = 0;
t->_sgmap = &pcp->pc_sgmap;
t->_pfthresh = TSP_SGMAP_PFTHRESH;
t->_get_tag = tsp_dma_get_tag;
t->_dmamap_create = alpha_sgmap_dmamap_create;
t->_dmamap_destroy = alpha_sgmap_dmamap_destroy;