4 Commits

Author	SHA1	Message	Date
H. Peter Anvin	621c2886aa	UNDI ISR: save and restore 32-bit registers ... As written, if the if the UNDI ISR call clobbers the upper halves of any of the GPRs (which by convention it is permitted to do, and by paranoia should be expected to do) then nothing in the interrupt handler will recover the state. Additionally, save/restore %fs and %gs out of sheer paranoia - it's a cheap enough operation, and may prevent problems due to poorly written UNDI stacks.	2008-02-10 18:06:10 -08:00
Michael Brown	efd322091d	Set up %ds *before* testing a value in our data segment (d'oh!). ... Always send EOI; do not chain to BIOS's default interrupt handler. They are just too unpredictable; at least VMware's seems to kill the machine if you go anywhere near it. Disable interrupts after return from PXENV_UNDI_ISR, just in case some dumb PXE stack enables them.	2007-07-10 17:08:32 +01:00
Michael Brown	edc4648c39	Protect ISR against failure to unhook.	2007-07-10 04:34:53 +01:00
Michael Brown	027fed72c1	Working code to call the PXE stack from within the ISR.	2007-07-10 04:21:24 +01:00