From 08bbc9da92f7e44b9c208c6a1adba70c403b255e Mon Sep 17 00:00:00 2001 From: Alex Nixon Date: Mon, 9 Feb 2009 12:05:46 -0800 Subject: xen: Add xen_create_contiguous_region A memory region must be physically contiguous in order to be accessed through DMA. This patch adds xen_create_contiguous_region, which ensures a region of contiguous virtual memory is also physically contiguous. Based on Stephen Tweedie's port of the 2.6.18-xen version. Remove contiguous_bitmap[] as it's no longer needed. Ported from linux-2.6.18-xen.hg 707:e410857fd83c [ Impact: add Xen-internal API to make pages phys-contig ] Signed-off-by: Alex Nixon Signed-off-by: Jeremy Fitzhardinge Signed-off-by: Ian Campbell Signed-off-by: Konrad Rzeszutek Wilk --- include/xen/xen-ops.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'include/xen/xen-ops.h') diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h index 883a21bba24b..d789c937c48a 100644 --- a/include/xen/xen-ops.h +++ b/include/xen/xen-ops.h @@ -14,4 +14,10 @@ void xen_mm_unpin_all(void); void xen_timer_resume(void); void xen_arch_resume(void); +extern unsigned long *xen_contiguous_bitmap; +int xen_create_contiguous_region(unsigned long vstart, unsigned int order, + unsigned int address_bits); + +void xen_destroy_contiguous_region(unsigned long vstart, unsigned int order); + #endif /* INCLUDE_XEN_OPS_H */ -- cgit v1.2.3-59-g8ed1b