Author: jhb
Date: Wed Mar 7 18:57:09 2012
New Revision: 232670
URL: http://svn.freebsd.org/changeset/base/232670
Log:
Remove the PAE-specific 2GB DMA boundary since HEAD now supports a proper 4G
boundary for PAE.
Modified:
head/sys/dev/pci/pci.c
Modified: head/sys/dev/pci/pci.c
==============================================================================
--- head/sys/dev/pci/pci.c Wed Mar 7 18:53:56 2012 (r232669)
+++ head/sys/dev/pci/pci.c Wed Mar 7 18:57:09 2012 (r232670)
@@ -70,20 +70,9 @@ __FBSDID("$FreeBSD$");
#include "pcib_if.h"
#include "pci_if.h"
-/*
- * XXX: Due to a limitation of the bus_dma_tag_create() API, we cannot
- * specify a 4GB boundary on 32-bit targets. Usually this does not
- * matter as it is ok to use a boundary of 0 on these systems.
- * However, in the case of PAE, DMA addresses can cross a 4GB
- * boundary, so as a workaround use a 2GB boundary.
- */
#if (BUS_SPACE_MAXADDR > 0xFFFFFFFF)
-#ifdef PAE
-#define PCI_DMA_BOUNDARY 0x80000000
-#else
#define PCI_DMA_BOUNDARY 0x100000000
#endif
-#endif
#define PCIR_IS_BIOS(cfg, reg)
\
(((cfg)->hdrtype == PCIM_HDRTYPE_NORMAL && reg == PCIR_BIOS) || \
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