linux-kernel - [PATCH 49 of 55] xen64: implement 64-bit update

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Date:	Tue, 08 Jul 2008 15:07:11 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
	Stephen Tweedie <sct@...hat.com>,
	Eduardo Habkost <ehabkost@...hat.com>,
	Mark McLoughlin <markmc@...hat.com>, x86@...nel.org
Subject: [PATCH 49 of 55] xen64: implement 64-bit update_descriptor

64-bit hypercall interface can pass a maddr in one argument rather
than splitting it.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
 include/asm-x86/xen/hypercall.h |   13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/include/asm-x86/xen/hypercall.h b/include/asm-x86/xen/hypercall.h
--- a/include/asm-x86/xen/hypercall.h
+++ b/include/asm-x86/xen/hypercall.h
@@ -466,10 +466,15 @@
 			struct desc_struct desc)
 {
 	mcl->op = __HYPERVISOR_update_descriptor;
-	mcl->args[0] = maddr;
-	mcl->args[1] = maddr >> 32;
-	mcl->args[2] = desc.a;
-	mcl->args[3] = desc.b;
+	if (sizeof(maddr) == sizeof(long)) {
+		mcl->args[0] = maddr;
+		mcl->args[1] = *(unsigned long *)&desc;
+	} else {
+		mcl->args[0] = maddr;
+		mcl->args[1] = maddr >> 32;
+		mcl->args[2] = desc.a;
+		mcl->args[3] = desc.b;
+	}
 }
 
 static inline void


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