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Michael Brown 0b606221cb [undi] Ensure forward progress is made even if UNDI IRQ is stuck 
If the UNDI interrupt remains constantly asserted (e.g. because the
BIOS has enabled interrupts for an unrelated device sharing the same
IRQ, or because of bugs in the OEM UNDI driver), then we may get stuck
in an interrupt storm.

We cannot safely chain to the previous interrupt handler (which could
plausibly handle an unrelated device interrupt) since there is no
well-defined behaviour for previous interrupt handlers.  We have
observed BIOSes to provide default interrupt handlers that variously
do nothing, send EOI, disable the IRQ, or crash the system.

Fix by disabling the UNDI interrupt whenever our handler is triggered,
and rearm it as needed when polling the network device.  This ensures
that forward progress continues to be made even if something causes
the interrupt to be constantly asserted.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
 		2025-03-26 14:56:20 +00:00
.github/workflows [ci] Update action versions to silence GitHub warnings 2024-03-07 23:25:35 +00:00
contrib [crypto] Update cmsdetach to work with python-asn1 version 3.0.0 2025-03-17 11:48:06 +00:00
src [undi] Ensure forward progress is made even if UNDI IRQ is stuck 2025-03-26 14:56:20 +00:00
COPYING [legal] Update GPLv2 licence text 2015-02-26 17:59:53 +00:00
COPYING.GPLv2 [legal] Update GPLv2 licence text 2015-02-26 17:59:53 +00:00
COPYING.UBDL [legal] Add support for the Unmodified Binary Distribution Licence 2015-03-02 12:07:14 +00:00
README [doc] Re-add README file 2010-05-28 00:03:47 +01:00

README 

iPXE README File

Quick start guide:

   cd src
   make

For any more detailed instructions, see http://ipxe.org