From: "Philippe Mathieu-Daudé" <philmd@oss.qualcomm.com>
To: Helge Deller <deller@kernel.org>, qemu-devel@nongnu.org
Cc: Richard Henderson <richard.henderson@linaro.org>,
Helge Deller <deller@gmx.de>
Subject: Re: [PATCH 1/4] target/hppa: Work-around for Fast TLB insert instruction on HP-UX 9
Date: Sun, 5 Jul 2026 23:58:15 +0200 [thread overview]
Message-ID: <95d68083-87d6-42e0-bb84-26465bed9f20@oss.qualcomm.com> (raw)
In-Reply-To: <20260703193224.33135-2-deller@kernel.org>
On 3/7/26 21:32, Helge Deller wrote:
> From: Helge Deller <deller@gmx.de>
>
> The HP-UX 9 kernel uses two TLB insert instructions (0x05315440 and
> 0x05385400), which seem to be wrongly encoded fast TLB instructions, but
> similiar to the non-fast instructions idtlba r17,(r9) and
> idtlbp r24,(r9).
>
> It's not clear, if those undocumented instructions were used by mistake,
> or intentionally. Either way, this patch allows qemu to handle those
> instructions, so that a HP-UX 9 boot-CD can now boot somewhat further (but
> still crashes due to other reasons afterwards).
>
> Signed-off-by: Helge Deller <deller@gmx.de>
> ---
> target/hppa/insns.decode | 2 ++
> 1 file changed, 2 insertions(+)
Reviewed-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>
next prev parent reply other threads:[~2026-07-05 21:59 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-03 19:32 [PATCH 0/4] Updates for hppa architecture Helge Deller
2026-07-03 19:32 ` [PATCH 1/4] target/hppa: Work-around for Fast TLB insert instruction on HP-UX 9 Helge Deller
2026-07-04 20:17 ` Richard Henderson
2026-07-05 21:58 ` Philippe Mathieu-Daudé [this message]
2026-07-03 19:32 ` [PATCH 2/4] target/hppa: Delay MMU update until TLB protection bits were set Helge Deller
2026-07-03 19:32 ` [PATCH 3/4] hw/misc/lasi: derive IRR from pending and unmasked requests Helge Deller
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