From: David Miller <davem@davemloft.net>
To: rth@twiddle.net
Cc: triegel@redhat.com, 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 15:31:00 -0000 [thread overview]
Message-ID: <20161104.113100.1070023733565010549.davem@davemloft.net> (raw)
In-Reply-To: <af38a965-24a4-3baf-40e5-7629103a0b1e@twiddle.net>
From: Richard Henderson <rth@twiddle.net>
Date: Fri, 4 Nov 2016 07:55:04 -0600
> 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.
I don't think they had much choice in the matter given how the ASIs
are doled out in v9 vs. pre-v9. :-/
next prev parent reply other threads:[~2016-11-04 15:31 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
2016-11-04 15:31 ` David Miller [this message]
2016-11-04 16:10 ` Richard Henderson
2016-11-04 14:04 ` Richard Henderson
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