region_intersects — determine intersection of region with known resources
int region_intersects ( | resource_size_t start, |
| size_t size, | |
| unsigned long flags, | |
unsigned long desc); |
resource_size_t startregion start address
size_t sizesize of region
unsigned long flagsflags of resource (in iomem_resource)
unsigned long descdescriptor of resource (in iomem_resource) or IORES_DESC_NONE
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.