[Xen-devel] [patch 06/26] Xen-paravirt_ops: paravirt_ops: allocate a fixmap slot

[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>

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

===================================================================
--- a/include/asm-i386/fixmap.h
+++ b/include/asm-i386/fixmap.h
@@ -86,6 +86,9 @@ 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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