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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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Do the actual idling in protected mode. This both allows PM code a
more efficient interface, but also handles bugs in HVM implementations
which don't handle HLT in real mode.
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
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Use jiffies instead of BIOS_timer. In 16-bit code we can use the low
16 bits of __jiffies when appropriate, since we have proper 2's
complement wraparound at all times.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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Port the PXE idle function to C; make the idle hook a protected-mode
call.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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Conflicts:
core/idle.inc
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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NoHalt was set to 1 temporarily for debugging; return it to 0.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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At least Etherboot (and all-but-super-recent versions of gPXE) PXE
ROMs improperly disable interrupts when calling an intercepted version
of INT 15h and 1Ah; this is due to the old trick of using "ret 2" to
return... this avoids resetting the flags for status, but it also
doesn't restore the value of the interrupt flag. Needless to say,
this causes serious issues.
Work around it by adding explicit pushf/popf or STI in places known to
have issues, but also add an STI in reset_idle, and add an error alert
in do_idle if we ever get called with interrupts disabled.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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Conflicts:
core/extlinux.asm
core/isolinux.asm
core/ldlinux.asm
core/pxeidle.inc
core/pxelinux.asm
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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Try to HLT the processor during idle. All the events we care about
should have interrupts associated with them, except possibly the
serial console. Try to deal with the serial console by waiting some
time before going into HLT, and giving the user the option of enabling
the serial console interrupt, on the assumption that the BIOS will
simply IRET.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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