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that interrupts be disabled and remain disabled until %cr2 is read. Otherwise we can preempt and another process can fault, and by the time we read %cr2, we see a different processes fault address. This Greatly Confuses vm_fault() (to say the least). The i386 port has got this marked as a bug workaround for a Cyrix CPU, which is what lead me astray. Its actually necessary for preemption, regardless of whether Cyrix cpus had a bug or not. |
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| isa | ||
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| Makefile | ||