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Michael Brown e0282688c1 [arm] Check PMCCNTR availability before use for profiling 
Reading from PMCCNTR causes an undefined instruction exception when
running in PL0 (e.g. as a Linux userspace binary), unless the
PMUSERENR.EN bit is set.

Restructure profile_timestamp() for 32-bit ARM to perform an
availability check on the first invocation, with subsequent
invocations returning zero if PMCCNTR could not be enabled.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
 		2024-09-24 16:14:33 +01:00
.github/workflows [ci] Update action versions to silence GitHub warnings 2024-03-07 23:25:35 +00:00
contrib [cloud] Add ability to delete old AMI images 2024-09-09 15:02:27 +01:00
src [arm] Check PMCCNTR availability before use for profiling 2024-09-24 16:14:33 +01:00
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