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if supported by the cpu(s). currently not enabled by default and
not compiled into ramdisks. this grows paddr_t to 64bit but yet
leaves bus_addr_t at 32bits. measures are taken to favour dmaable
memory allocation from below 4g line such that buffer cache is
already allocated form below, pool backend allocator prefers lower
memory and then finally bounce buffers are used as last resort.
PAE is engaged only if global variable cpu_pae is manually set
to non-zero and there is physical memory present above 4g.
simplify pcibios address math to use u_long as we always will
be in the 32bit space.
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rescinded 22 July 1999. Proofed by myself and Theo.
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tss and not only in the frame since we might be returning that way too.
add a heuristic for detecting an exec protection fault:
iff we get a read protection fault (which we normally never
get due to our segments being always readable) we assume that
it was an exec protection indeed and go to page fault
routine which will decide the rest for us (including sending
a signal should that be needed).
problem found by drahn@ and testing by many ppl.
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