Jason Lowe-Power has uploaded a new patch set (#4) to the change originally
created by Isaac Richter. (
https://gem5-review.googlesource.com/c/public/gem5/+/10321 )
Change subject: arch-x86: Make LFENCE a serializing instruction
......................................................................
arch-x86: Make LFENCE a serializing instruction
According to the Intel SDM, no instruction following an LFENCE can begin
execution until after the LFENCE has executed. (This is
less strict than an actual serializing instruction, such as CPUID.)
Serializing instructions (per intel SDM Volume 3A Chapter 8.3) ensure
that no future instruction is fetched until after the serializing
instruction is completed.
By contrast, LFENCE (and other memory-ordering instructions) allows
future instructions to have been fetched; it just prohibits them from
being executed.
Change-Id: If89fcb552192326ab69a581f57d71c95cf5d90e7
Signed-off-by: Isaac Richter <[email protected]>
---
M src/arch/x86/isa/decoder/two_byte_opcodes.isa
1 file changed, 2 insertions(+), 1 deletion(-)
--
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Gerrit-Project: public/gem5
Gerrit-Branch: master
Gerrit-Change-Id: If89fcb552192326ab69a581f57d71c95cf5d90e7
Gerrit-Change-Number: 10321
Gerrit-PatchSet: 4
Gerrit-Owner: Isaac Richter <[email protected]>
Gerrit-Reviewer: Anthony Gutierrez <[email protected]>
Gerrit-Reviewer: Brandon Potter <[email protected]>
Gerrit-Reviewer: Gabe Black <[email protected]>
Gerrit-Reviewer: Isaac Richter <[email protected]>
Gerrit-Reviewer: Jason Lowe-Power <[email protected]>
Gerrit-Reviewer: kokoro <[email protected]>
Gerrit-CC: Andrea Mondelli <[email protected]>
Gerrit-MessageType: newpatchset
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