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npxsave() went to great lengths to excecute fnsave with interrupts enabled in case executing it froze the CPU. This case can't happen, at least for Intel CPU/NPX's. Spurious IRQ13's don't imply spurious freezes. Anyway, the complications were usually no-ops because IRQ13 is not used on i486's and newer CPUs, and because SMPng broke them in rev.1.84. Forcible enabling of interrupts was changed to write_eflags(old_eflags), but since SMPng usually calls npxsave() from cpu_switch() with interrupts disabled, write_eflags() usually just kept interrupts disabled. |
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