Messages in this thread | | | From | (Shail Bains) | Subject | Why 4 HLTs in bugs.h? | Date | 7 Feb 1999 17:34:24 GMT |
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In the file $SRC/include/asm-i386/bugs.h, function check_hlt(), which prints the "Checking 'hlt' instruction...Ok" message during bootup, why are there 4 HLTs?
__asm__ __volatile__("hlt ; hlt ; hlt ; hlt");
Why are 4 HLTs required? Isn't just 1 HLT sufficient to see if HLT indeed works? Why is such a check required? Is it to check whether interrupts can indeed drive the processor out of HALT mode (and continue bootup?)
--shail
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