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    Subject[patch 06/17] Allocate a fixmap slot
    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@xensource.com>
    Acked-by: Ingo Molnar <mingo@elte.hu>

    ---
    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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