From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
"H. Peter Anvin" <hpa@zytor.com>
Cc: x86@kernel.org, "Luck, Tony" <tony.luck@intel.com>,
"Lin, Jing" <jing.lin@intel.com>,
"Kumar, Sanjay K" <sanjay.k.kumar@intel.com>,
linux-kernel@vger.kernel.org,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: [PATCH] x86/asm: Add support for MOVDIR64B instruction
Date: Wed, 31 Jul 2019 02:05:54 +0300 [thread overview]
Message-ID: <20190730230554.8291-1-kirill.shutemov@linux.intel.com> (raw)
Add support for a new instruction MOVDIR64B. The instruction moves
64-bytes as direct-store with 64-byte write atomicity from source memory
address to destination memory address.
MOVDIR64B requires the destination address to be 64-byte aligned. No
alignment restriction is enforced for source operand.
See Intel Software Developer’s Manual for more information on the
instruction.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
Several upcoming patchsets will make use of the helper.
---
arch/x86/include/asm/special_insns.h | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/arch/x86/include/asm/special_insns.h b/arch/x86/include/asm/special_insns.h
index 219be88a59d2..059e7bd331d2 100644
--- a/arch/x86/include/asm/special_insns.h
+++ b/arch/x86/include/asm/special_insns.h
@@ -248,6 +248,13 @@ static inline void clwb(volatile void *__p)
#define nop() asm volatile ("nop")
+static inline void movdir64b(void *dst, const void *src)
+{
+ /* movdir64b [rdx], rax */
+ asm volatile(".byte 0x66, 0x0f, 0x38, 0xf8, 0x02"
+ : "=m" (*(char *)dst)
+ : "d" (src), "a" (dst));
+}
#endif /* __KERNEL__ */
--
2.21.0
next reply other threads:[~2019-07-30 23:06 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-30 23:05 Kirill A. Shutemov [this message]
2019-07-31 0:24 ` [PATCH] x86/asm: Add support for MOVDIR64B instruction jinglin
2019-08-01 10:03 ` Borislav Petkov
2019-08-01 11:03 ` Kirill A. Shutemov
2019-08-01 19:20 ` Luck, Tony
2019-08-01 19:36 ` Borislav Petkov
2019-08-01 19:43 Alexey Dobriyan
2019-08-01 19:49 ` Luck, Tony
2019-08-01 20:28 ` Kirill A. Shutemov
2019-08-01 20:36 ` Borislav Petkov
2019-08-01 22:06 ` Luck, Tony
2019-08-02 14:40 ` Borislav Petkov
2019-08-05 17:50 ` Lin, Jing
2019-08-01 21:53 ` Alexey Dobriyan
2019-08-02 8:15 ` Peter Zijlstra
2019-08-02 12:58 ` Kirill A. Shutemov
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