narenas
/
opengnsys_ipxe
mirror of https://github.com/ipxe/ipxe.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity
Clone of ipxe replica repo
5,834 Commits
13 Branches
11 Tags
107 MiB
C 97.4%
Assembly 1.3%
Perl 0.6%
Makefile 0.4%
Python 0.2%
 
 
 
 
 
Go to file
Michael Brown 1df3b53051 [build] Prevent use of MMX and SSE registers 
The existence of MMX and SSE is required by the System V x86_64 ABI
and so is assumed by gcc, but these registers are not preserved by our
own interrupt handlers and are unlikely to be preserved by other
context switch handlers in a boot firmware environment.

Explicitly prevent gcc from using MMX or SSE registers to avoid
potential problems due to silent register corruption.

We must remove the %xmm0-%xmm5 clobbers from the x86_64 version of
hv_call() since otherwise gcc will complain about unknown register
names.  Theoretically, we should probably add code to explicitly
preserve the %xmm0-%xmm5 registers across a hypercall, in order to
guarantee to external code that these registers remain unchanged.  In
practice this is difficult since SSE registers are disabled by
default: for background information see commits 71560d1 ("[librm]
Preserve FPU, MMX and SSE state across calls to virt_call()") and
dd9a14d ("[librm] Conditionalize the workaround for the Tivoli VMM's
SSE garbling").

Signed-off-by: Michael Brown <mcb30@ipxe.org>
 		2018-03-20 22:01:08 +02:00
contrib [coverity] Add Coverity user model 2017-03-22 16:46:03 +02:00
src [build] Prevent use of MMX and SSE registers 2018-03-20 22:01:08 +02:00
.travis.yml [travis] Integrate with Coverity Scan 2017-03-23 10:51:25 +02:00
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