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APECS has a 256 byte DMA prefetch threshold.

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This commit is contained in:
thorpej 2001-07-19 18:39:29 +00:00
parent 337651a310
commit 908464bef9
1 changed files with 6 additions and 2 deletions
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8
sys/arch/alpha/pci/apecs_dma.c
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@ -1,4 +1,4 @@
/* $NetBSD: apecs_dma.c,v 1.14 2001/01/03 19:16:00 thorpej Exp $ */
/* $NetBSD: apecs_dma.c,v 1.15 2001/07/19 18:39:29 thorpej Exp $ */
/*-
* Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
@ -39,7 +39,7 @@
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: apecs_dma.c,v 1.14 2001/01/03 19:16:00 thorpej Exp $");
__KERNEL_RCSID(0, "$NetBSD: apecs_dma.c,v 1.15 2001/07/19 18:39:29 thorpej Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -85,6 +85,9 @@ void apecs_bus_dmamap_unload_sgmap __P((bus_dma_tag_t, bus_dmamap_t));
#define APECS_SGMAP_MAPPED_BASE (8*1024*1024)
#define APECS_SGMAP_MAPPED_SIZE (8*1024*1024)
/* APECS has a 256-byte out-bound DMA prefetch threshold. */
#define APECS_SGMAP_PFTHRESH 256
/*
* Macro to flush APECS scatter/gather TLB.
*/
@ -138,6 +141,7 @@ apecs_dma_init(acp)
t->_next_window = NULL;
t->_boundary = 0;
t->_sgmap = &acp->ac_sgmap;
t->_pfthresh = APECS_SGMAP_PFTHRESH;
t->_get_tag = apecs_dma_get_tag;
t->_dmamap_create = alpha_sgmap_dmamap_create;
t->_dmamap_destroy = alpha_sgmap_dmamap_destroy;