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Date: Wed, 28 Dec 2016 12:20:23 +0100
From: Borislav Petkov <bp@alien8.de>
To: Junichi Nomura <j-nomura@ce.jp.nec.com>
Cc: "x86@kernel.org" <x86@kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Andy Lutomirski <luto@amacapital.net>,
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        "mingo@redhat.com" <mingo@redhat.com>, "hpa@zytor.com" <hpa@zytor.com>
Subject: [PATCH 1/2] x86/CPU: Add native CPUID variants returning a single
 datum
Message-ID: <20161228112023.GB21788@nazgul.tnic>
References: <2f771739-a617-0870-2f68-2a8ebba0bc46@ce.jp.nec.com>
 <20161228111830.GA21788@nazgul.tnic>
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From: Borislav Petkov <bp@suse.de>

... similar to the cpuid_<reg>() variants.

Signed-off-by: Borislav Petkov <bp@suse.de>
---
 arch/x86/include/asm/processor.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index eaf100508c36..27ae83fc37de 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -219,6 +219,24 @@ static inline void native_cpuid(unsigned int *eax, unsigned int *ebx,
 	    : "memory");
 }
 
+#define native_cpuid_reg(reg)					\
+static inline unsigned int native_cpuid_##reg(unsigned int op)	\
+{								\
+	unsigned int eax = (op), ebx, ecx = 0, edx;		\
+								\
+	native_cpuid(&eax, &ebx, &ecx, &edx);			\
+								\
+	return reg;						\
+}
+
+/*
+ * Native CPUID functions returning a single datum.
+ */
+native_cpuid_reg(eax)
+native_cpuid_reg(ebx)
+native_cpuid_reg(ecx)
+native_cpuid_reg(edx)
+
 static inline void load_cr3(pgd_t *pgdir)
 {
 	write_cr3(__pa(pgdir));
-- 
2.8.4

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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