8ceb62488c
Add macros to atomically increment an integer variable in the data section and to atomically set a bit in a tte. Note that the latter does not return the new value. Rewrite RESUME_SPILLFILL_MAGIC to use more sensical calculations, and to preserve all alternate globals religiously. Must now be called on alternate globals. Defer switching to the kernel stack until inside the syscall, trap, interrupt wrappers. Splitting the windows is all that's really urgent. Adapt to new trap types. Add %xcc where appropriate in order to not use v8 opcodes inadvertantly (which work fine). Modify the low level tlb fault handlers to operate on a tsb made up of ttes, not sttes. This effectively makes the tsb twice as large. After atomically updating tte bits in memory, also set the bit in the register that holds the data which will be loaded into the tlb. The macro returns the old value. Use the preloaded mmu global which holds the address of the current user tsb. Add back a low level protection fault handler instead of just punting into the vm system. This effectively saves a soft fault per COW fault. Add a trace to intr_enqueue. Pass arguments to the trap, interrupt, syscall wrappers in the out registers instead of some on the stack, some in registers. Use the preloaded alternate global pcb register.
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