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

From: Andi Kleen
Date: Mon Apr 30 2007 - 06:36:45 EST

From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
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@xxxxxxxxxxxxx>
Signed-off-by: Andi Kleen <ak@xxxxxxx>
Acked-by: Ingo Molnar <mingo@xxxxxxx>

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 {
/* temporary boot-time mappings, used before ioremap() is functional */
#define NR_FIX_BTMAPS 16
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