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REGION_INTERSECTS(9) | Hardware Interfaces | REGION_INTERSECTS(9) |
NAME¶
region_intersects - determine intersection of region with known resourcesSYNOPSIS¶
int
region_intersects(resource_size_t start,
size_t size,
unsigned long flags,
unsigned long desc);
ARGUMENTS¶
startregion 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¶
January 2017 | Kernel Hackers Manual 4.8. |