Thank you, I prefer to implement the NOP solution.
On 19/2/21 14:12, Giacomo Travaglini wrote:
Hi Victor
-----Original Message-----
From: Víctor Soria via gem5-users <[email protected]>
Sent: 19 February 2021 12:00
To: [email protected]
Cc: Víctor Soria <[email protected]>
Subject: [gem5-users] Deactivate WFE in Full System Simulation
Hello,
I am using gem5 with the ARM ISA. I am working with some locks and I would
want to deactivate the WFE instructions, since a lot of modern CPU ignore
them. I have seen that there is a register to configure WFE traps (ntwe), but I
do not know what to do. So, what should I do to configure it?
Ignoring the WFE is really a uarch detail and it’s not exposed to the
architecture through a specific register.
While there might be a cleaner way to handle this, you could either simply
comment the quiescing code in the
Instruction implementation [1], or you could replace it with a NOP
(depending if you still want the trapping knobs to be available, which is
something I'd recommend)
(Do not forget the IsQuiesce op class)
I am using the full system simulation through fs.py. I do not know if I have to
use a command or change the config scripts.
Thank you,
Víctor.
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[1]:
https://github.com/gem5/gem5/blob/stable/src/arch/arm/isa/insts/misc.isa#L729
[2]:
https://github.com/gem5/gem5/blob/stable/src/arch/arm/isa/insts/misc.isa#L756
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