linux-kernel - [PATCH 1/5] x86: get_desc

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Message-Id: <20071121101928.A08CF26F8BE@magilla.localdomain>
Date:	Wed, 21 Nov 2007 02:19:28 -0800 (PST)
From:	Roland McGrath <roland@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 1/5] x86: get_desc_base


This defines the get_desc_base function in asm-x86/desc_64.h to match the
one in desc_32.h.  If these two files ever get merged together, this
function could be the same in both.

Signed-off-by: Roland McGrath <roland@...hat.com>

diff --git a/include/asm-x86/desc_64.h b/include/asm-x86/desc_64.h
index 7d9c938..70bd72f 100644
--- a/include/asm-x86/desc_64.h
+++ b/include/asm-x86/desc_64.h
@@ -199,6 +199,16 @@ static inline void load_LDT(mm_context_t *pc)
 
 extern struct desc_ptr idt_descr;
 
+static inline unsigned long get_desc_base(const void *ptr)
+{
+	const u32 *desc = ptr;
+	unsigned long base;
+	base = ((desc[0] >> 16)  & 0x0000ffff) |
+		((desc[1] << 16) & 0x00ff0000) |
+		(desc[1] & 0xff000000);
+	return base;
+}
+
 #endif /* !__ASSEMBLY__ */
 
 #endif
-
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