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Add a timer denominated in milliseconds. This is still driven by the
18.2 Hz timer interrupt, but counts "real" milliseconds, including
handing the adjustment factor (which in reality means it advances by
55 for most timer ticks and 54 for some.)
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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Move the __jiffies and _IdleTimer variables to the .data16 segment.
This ensures that if do_idle is invoked very early that it will not
jump off into a non-existent idle routine.
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
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__jiffies really wants to be aligned. We're not SMP, so technically
it will be atomic anyway. Still...
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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The BIOS_timer variable at 4C6h is somewhat unreliable... it is
documented to wrap at "midnight", norminally after 1627419 ticks
(0x18d51b), which is a rather awkward number to deal with modulo.
Instead, hook the INT 1Ch secondary timer interrupt and just count a
simple incrementing variable.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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