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This new function lets you request to remove a specific address range
from the allocator. It returns true on success and leaves the allocator
unmodified and returns false on failure. It doesn't need to return an
offset because, if it succeeds, the offset passed in is the allocated
offset.
Reviewed-by: Ivan Briano <[email protected]>
Reviewed-by: Lionel Landwerlin <[email protected]>
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Reviewed-by: Ivan Briano <[email protected]>
Reviewed-by: Lionel Landwerlin <[email protected]>
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This is simple linear-walk first-fit allocator roughly based on the
allocator in the radeon winsys code. This allocator has two primary
functional differences:
1) It cleanly returns 0 on allocation failure
2) It allocates addresses top-down instead of bottom-up.
The second one is needed for Intel because high addresses (with bit 47
set) need to be canonicalized in order to work properly. If we allocate
bottom-up, then high addresses will be very rare (if they ever happen).
We'd rather always have high addresses so that the canonicalization code
gets better testing.
v2: - [scott-ph] remove _heap_validate() if NDEBUG is defined (Jordan)
Reviewed-by: Scott D Phillips <[email protected]>
Tested-by: Scott D Phillips <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>
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