Messages in this thread | | | Subject | Re: [2.1.98] - It compiled and I ran... | Date | Sun, 26 Apr 1998 15:10:25 -0600 | From | Stephen Williams <> |
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> 1. Find biggest free block within DMA availible range. > 2. Move memory from either side out of the way, like up high in the > memory space where ISA DMA can't happen.
kwr@kwr.hnv.com said: > "Move" is the stumbling block here. You don't know what memory > regions (forgot the structure names already *sigh*) use a given > physical address unless you exhaustively check every PTE of every > memory region in every process. Plus the buffer cache.
Plus device drivers. Some pci device may have a pointer to that memory there. In other words, it might not be in any kernel tables at all.
-- Steve Williams "The woods are lovely, dark and deep. steve@icarus.com But I have promises to keep, steve@picturel.com and lines to code before I sleep, http://www.picturel.com And lines to code before I sleep."
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