[ipxe-devel] [ipxe/ipxe] [efi] Restore the TPL to the original one (#113)

[He Huang]

@mcb30 ,

The root cause is in static unsigned long efi_currticks ( void );
Then please print the original TPL in this function.
Because this TPL is always raised to TPL_CALLBACK, then when gEfiEventExitBootServicesGuid is triggerred, some notify function which are registerred at TPL_CALLBACK cannot be executed. 
You can register such kind of callback at TPL_CALLBACK, and check whether it can be executed when gEfiEventExitBootServicesGuid is signnalled.

@huanghe4 

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