From: Richard Henderson <rth@twiddle.net>
To: David Miller <davem@davemloft.net>, triegel@redhat.com
Cc: andreas@gaisler.com, libc-alpha@sourceware.org,
adhemerval.zanella@linaro.org, carlos@redhat.com,
software@gaisler.com
Subject: Re: [RFC][PATCH 0/2] Make sparcv8 work again on cas enabled hardware
Date: Fri, 04 Nov 2016 13:55:00 -0000 [thread overview]
Message-ID: <af38a965-24a4-3baf-40e5-7629103a0b1e@twiddle.net> (raw)
In-Reply-To: <20161103.132213.598669006383889263.davem@davemloft.net>
On 11/03/2016 11:22 AM, David Miller wrote:
> From: Torvald Riegel <triegel@redhat.com>
> Date: Thu, 03 Nov 2016 16:39:21 +0100
>
>> Is there any difference between the additional CAS on a v8 and the CAS
>> on a v9? If there should be none (eg, same instruciton encoding etc.),
>> we wouldn't need a runtime check for this, would we?
>
> A quick look at binutils shows that the encoding appears to be the same.
Yes and no. The instruction format is the same, but the ASI used is different.
The CAS for leon userspace uses ASI_USERDATA (0x0A), not the v9 ASI_P (0x80).
It's a really annoying difference that I wish the cpu designers hadn't made.
r~
next prev parent reply other threads:[~2016-11-04 13:55 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-01 15:08 Andreas Larsson
2016-11-01 15:08 ` [RFC][PATCH 1/2] sparc32: Mark sendmsg and recvmsg system calls as unsupported Andreas Larsson
2016-11-01 17:28 ` Adhemerval Zanella
2016-11-02 11:38 ` Andreas Larsson
2016-11-02 12:49 ` Adhemerval Zanella
2016-11-04 18:36 ` David Miller
2016-11-01 15:08 ` [RFC][PATCH 2/2] sparc32: Use cas for atomic_* operations and use general pthread_barrier_wait Andreas Larsson
2016-11-04 18:37 ` David Miller
2016-11-04 18:44 ` David Miller
2016-11-01 16:00 ` [RFC][PATCH 0/2] Make sparcv8 work again on cas enabled hardware Torvald Riegel
2016-11-01 16:09 ` David Miller
2016-11-01 16:46 ` Torvald Riegel
2016-11-01 16:51 ` David Miller
2016-11-02 10:05 ` Torvald Riegel
2016-11-02 11:29 ` Andreas Larsson
2016-11-02 15:32 ` David Miller
2016-11-02 22:33 ` Torvald Riegel
2016-11-03 2:52 ` David Miller
2016-11-03 15:39 ` Torvald Riegel
2016-11-03 17:22 ` David Miller
2016-11-03 18:41 ` Adhemerval Zanella
2016-11-03 20:33 ` David Miller
2016-11-03 21:29 ` Adhemerval Zanella
2016-11-03 22:25 ` Torvald Riegel
2016-11-04 10:28 ` Andreas Larsson
2016-11-04 15:23 ` David Miller
2016-11-04 13:55 ` Richard Henderson [this message]
2016-11-04 15:31 ` David Miller
2016-11-04 16:10 ` Richard Henderson
2016-11-04 14:04 ` Richard Henderson
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