| REGION_INTERSECTS(9) - phpMan
REGION_INTERSECTS(9) Hardware Interfaces REGION_INTERSECTS(9)
NAME
region_intersects - determine intersection of region with known resources
SYNOPSIS
int region_intersects(resource_size_t start, size_t size, unsigned long flags,
unsigned long desc);
ARGUMENTS
start
region start address
size
size of region
flags
flags of resource (in iomem_resource)
desc
descriptor of resource (in iomem_resource) or IORES_DESC_NONE
DESCRIPTION
Check if the specified region partially overlaps or fully eclipses a resource identified
by flags and desc (optional with IORES_DESC_NONE). Return REGION_DISJOINT if the region
does not overlap flags/desc, return REGION_MIXED if the region overlaps flags/desc and
another resource, and return REGION_INTERSECTS if the region overlaps flags/desc and no
other defined resource. Note that REGION_INTERSECTS is also returned in the case when the
specified region overlaps RAM and undefined memory holes.
region_intersect is used by memory remapping functions to ensure the user is not remapping
RAM and is a vast speed up over walking through the resource table page by page.
COPYRIGHT
Kernel Hackers Manual 4.8. January 2017 REGION_INTERSECTS(9)
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