* [PATCH] eal/x86: fix 32-bit write-combined stores
@ 2024-09-06 13:27 Bruce Richardson
2024-09-06 15:18 ` Radu Nicolau
2024-09-12 5:56 ` Tyler Retzlaff
0 siblings, 2 replies; 3+ messages in thread
From: Bruce Richardson @ 2024-09-06 13:27 UTC (permalink / raw)
To: dev; +Cc: Bruce Richardson, radu.nicolau, stable
The "movdiri" instruction is given as a series of bytes in rte_io.h so
that it works on compilers/assemblers which are unaware of the
instruction. The REX prefix (0x40) on this instruction is invalid for
32-bit code, causing issues. Thankfully, the prefix is unnecessary in
64-bit code, since the data size used is 32-bits.
Fixes: 8a00dfc738fe ("eal: add write combining store")
Cc: radu.nicolau@intel.com
Cc: stable@dpdk.org
Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
lib/eal/x86/include/rte_io.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/eal/x86/include/rte_io.h b/lib/eal/x86/include/rte_io.h
index 0e1fefdee1..5366e09c47 100644
--- a/lib/eal/x86/include/rte_io.h
+++ b/lib/eal/x86/include/rte_io.h
@@ -24,7 +24,7 @@ __rte_x86_movdiri(uint32_t value, volatile void *addr)
{
asm volatile(
/* MOVDIRI */
- ".byte 0x40, 0x0f, 0x38, 0xf9, 0x02"
+ ".byte 0x0f, 0x38, 0xf9, 0x02"
:
: "a" (value), "d" (addr));
}
--
2.43.0
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] eal/x86: fix 32-bit write-combined stores
2024-09-06 13:27 [PATCH] eal/x86: fix 32-bit write-combined stores Bruce Richardson
@ 2024-09-06 15:18 ` Radu Nicolau
2024-09-12 5:56 ` Tyler Retzlaff
1 sibling, 0 replies; 3+ messages in thread
From: Radu Nicolau @ 2024-09-06 15:18 UTC (permalink / raw)
To: Bruce Richardson, dev; +Cc: stable
On 06-Sep-24 2:27 PM, Bruce Richardson wrote:
> The "movdiri" instruction is given as a series of bytes in rte_io.h so
> that it works on compilers/assemblers which are unaware of the
> instruction. The REX prefix (0x40) on this instruction is invalid for
> 32-bit code, causing issues. Thankfully, the prefix is unnecessary in
> 64-bit code, since the data size used is 32-bits.
>
> Fixes: 8a00dfc738fe ("eal: add write combining store")
> Cc: radu.nicolau@intel.com
> Cc: stable@dpdk.org
>
> Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
> ---
Acked-by: Radu Nicolau <radu.nicolau@intel.com>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] eal/x86: fix 32-bit write-combined stores
2024-09-06 13:27 [PATCH] eal/x86: fix 32-bit write-combined stores Bruce Richardson
2024-09-06 15:18 ` Radu Nicolau
@ 2024-09-12 5:56 ` Tyler Retzlaff
1 sibling, 0 replies; 3+ messages in thread
From: Tyler Retzlaff @ 2024-09-12 5:56 UTC (permalink / raw)
To: Bruce Richardson; +Cc: dev, radu.nicolau, stable
On Fri, Sep 06, 2024 at 02:27:57PM +0100, Bruce Richardson wrote:
> The "movdiri" instruction is given as a series of bytes in rte_io.h so
> that it works on compilers/assemblers which are unaware of the
> instruction. The REX prefix (0x40) on this instruction is invalid for
> 32-bit code, causing issues. Thankfully, the prefix is unnecessary in
> 64-bit code, since the data size used is 32-bits.
>
> Fixes: 8a00dfc738fe ("eal: add write combining store")
> Cc: radu.nicolau@intel.com
> Cc: stable@dpdk.org
>
> Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
> ---
Acked-by: Tyler Retzlaff <roretzla@linux.microsoft.com>
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2024-09-12 5:56 UTC | newest]
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2024-09-06 15:18 ` Radu Nicolau
2024-09-12 5:56 ` Tyler Retzlaff
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