From: Ross Zwisler <ross.zwisler@linux.intel.com>
To: linux-kernel@vger.kernel.org
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>,
H Peter Anvin <h.peter.anvin@intel.com>,
Ingo Molnar <mingo@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Borislav Petkov <bp@alien8.de>
Subject: [PATCH v2 1/2] x86: Add support for the pcommit instruction
Date: Fri, 23 Jan 2015 13:40:27 -0700 [thread overview]
Message-ID: <1422045628-16225-2-git-send-email-ross.zwisler@linux.intel.com> (raw)
In-Reply-To: <1422045628-16225-1-git-send-email-ross.zwisler@linux.intel.com>
Add support for the new pcommit instruction. This instruction was
announced in the document "Intel Architecture Instruction Set Extensions
Programming Reference" with reference number 319433-022.
https://software.intel.com/sites/default/files/managed/0d/53/319433-022.pdf
Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: H Peter Anvin <h.peter.anvin@intel.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Borislav Petkov <bp@alien8.de>
---
arch/x86/include/asm/cpufeature.h | 1 +
arch/x86/include/asm/special_insns.h | 6 ++++++
2 files changed, 7 insertions(+)
diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
index bb9b258..dfdd689 100644
--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -220,6 +220,7 @@
#define X86_FEATURE_RDSEED ( 9*32+18) /* The RDSEED instruction */
#define X86_FEATURE_ADX ( 9*32+19) /* The ADCX and ADOX instructions */
#define X86_FEATURE_SMAP ( 9*32+20) /* Supervisor Mode Access Prevention */
+#define X86_FEATURE_PCOMMIT ( 9*32+22) /* PCOMMIT instruction */
#define X86_FEATURE_CLFLUSHOPT ( 9*32+23) /* CLFLUSHOPT instruction */
#define X86_FEATURE_AVX512PF ( 9*32+26) /* AVX-512 Prefetch */
#define X86_FEATURE_AVX512ER ( 9*32+27) /* AVX-512 Exponential and Reciprocal */
diff --git a/arch/x86/include/asm/special_insns.h b/arch/x86/include/asm/special_insns.h
index e820c08..1709a2e 100644
--- a/arch/x86/include/asm/special_insns.h
+++ b/arch/x86/include/asm/special_insns.h
@@ -199,6 +199,12 @@ static inline void clflushopt(volatile void *__p)
"+m" (*(volatile char __force *)__p));
}
+static inline void pcommit(void)
+{
+ alternative(ASM_NOP4, ".byte 0x66, 0x0f, 0xae, 0xf8",
+ X86_FEATURE_PCOMMIT);
+}
+
#define nop() asm volatile ("nop")
--
1.9.3
next prev parent reply other threads:[~2015-01-23 20:41 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-23 20:40 [PATCH v2 0/2] add support for new persistent memory instructions Ross Zwisler
2015-01-23 20:40 ` Ross Zwisler [this message]
2015-01-23 20:40 ` [PATCH v2 2/2] x86: Add support for the clwb instruction Ross Zwisler
2015-01-23 23:03 ` [PATCH v2 0/2] add support for new persistent memory instructions H. Peter Anvin
2015-01-24 11:14 ` Borislav Petkov
2015-01-26 19:59 ` Ross Zwisler
2015-01-26 21:34 ` Borislav Petkov
2015-01-26 21:50 ` Ross Zwisler
2015-01-26 22:39 ` Borislav Petkov
2015-01-26 23:14 ` Ross Zwisler
2015-01-26 19:51 ` Ross Zwisler
2015-01-26 20:05 ` H. Peter Anvin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1422045628-16225-2-git-send-email-ross.zwisler@linux.intel.com \
--to=ross.zwisler@linux.intel.com \
--cc=bp@alien8.de \
--cc=h.peter.anvin@intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@kernel.org \
--cc=tglx@linutronix.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.