Hi Jason,
The radeon kernel driver only allows 4GB or 8GB of virtual address space,
so we are talking about 33 usable bits. The radeon winsys also has to
support 32-bit allocations where the high bits are 0, and it uses a
separate allocator if the address space size is 8GB, or not if it's just
4GB
Marek & Nicolai,
FYI, I am NOT trying to NIH anything here. My hope was that eventually,
the radeon winsys code and the Intel drivers should share an allocator. I
considered starting by pulling the one out of the radeon winsys code and
modifying it but there were a couple of issues (mentioned be
From: Jason Ekstrand
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 sec
