linux-kernel - [PATCH] [6/40] i386: Allocate a fixmap slot

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Date:	Mon, 30 Apr 2007 12:27:39 +0200 (CEST)
From:	Andi Kleen <ak@...e.de>
To:	jeremy@...p.org, patches@...-64.org, linux-kernel@...r.kernel.org
Subject: [PATCH] [6/40] i386: Allocate a fixmap slot

From: Jeremy Fitzhardinge <jeremy@...p.org>
Allocate a fixmap slot for use by a paravirt_ops implementation.  This
is intended for early-boot bootstrap mappings.  Once the zones and
allocator have been set up, it would be better to use get_vm_area() to
allocate some virtual space.

Xen uses this to map the hypervisor's shared info page, which doesn't
have a pseudo-physical page number, and therefore can't be mapped
ordinarily.  It is needed early because it contains the vcpu state,
including the interrupt mask.

Signed-off-by: Jeremy Fitzhardinge <jeremy@...source.com>
Signed-off-by: Andi Kleen <ak@...e.de>
Acked-by: Ingo Molnar <mingo@...e.hu>

---
 include/asm-i386/fixmap.h |    3 +++
 1 file changed, 3 insertions(+)

===================================================================
Index: linux/include/asm-i386/fixmap.h
===================================================================
--- linux.orig/include/asm-i386/fixmap.h
+++ linux/include/asm-i386/fixmap.h
@@ -84,6 +84,9 @@ enum fixed_addresses {
 #ifdef CONFIG_PCI_MMCONFIG
 	FIX_PCIE_MCFG,
 #endif
+#ifdef CONFIG_PARAVIRT
+	FIX_PARAVIRT_BOOTMAP,
+#endif
 	__end_of_permanent_fixed_addresses,
 	/* temporary boot-time mappings, used before ioremap() is functional */
 #define NR_FIX_BTMAPS	16
-
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