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Michael Brown 829e2d1f29 [rng] Restore state of IRQ 8 and PIE when disabling entropy gathering 
Legacy IRQ 8 appears to be enabled by default on some platforms.  If
iPXE selects the RTC entropy source, this will currently result in the
RTC IRQ 8 being unconditionally disabled.  This can break assumptions
made by BIOSes or subsequent bootloaders: in particular, the FreeBSD
loader may lock up at the point of starting its default 10-second
countdown when it calls INT 15,86.

Fix by restoring the previous state of IRQ 8 instead of disabling it
unconditionally.  Note that we do not need to disable IRQ 8 around the
point of hooking (or unhooking) the ISR, since this code will be
executing in iPXE's normal state of having interrupts disabled anyway.

Also restore the previous state of the RTC periodic interrupt enable,
rather than disabling it unconditionally.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
 		2025-03-14 15:08:05 +00:00
.github/workflows [ci] Update action versions to silence GitHub warnings 2024-03-07 23:25:35 +00:00
contrib [contrib] Update bochsrc.txt to work with current versions 2025-03-14 12:46:02 +00:00
src [rng] Restore state of IRQ 8 and PIE when disabling entropy gathering 2025-03-14 15:08:05 +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