efi/runtime-wrappers: Add {__,}efi_call_virt() templates

Currently each architecture must implement two macros, efi_call_virt() and
__efi_call_virt(), which only differ by the presence or absence of a
return type. Otherwise, the logic surrounding the call is identical.

As each architecture must define the entire body of each, we can't place
any generic manipulation (e.g. irq flag validation) in the middle.

This patch adds template implementations of these macros. With these,
arch code can implement three template macros, avoiding reptition for
the void/non-void return cases:

* arch_efi_call_virt_setup()

  Sets up the environment for the call (e.g. switching page tables,
  allowing kernel-mode use of floating point, if required).

* arch_efi_call_virt()

  Performs the call. The last expression in the macro must be the call
  itself, allowing the logic to be shared by the void and non-void
  cases.

* arch_efi_call_virt_teardown()

  Restores the usual kernel environment once the call has returned.

While the savings from repition are minimal, we additionally gain the
ability to add common code around the call with the call environment set
up. This can be used to detect common firmware issues (e.g. bad irq mask
management).

Signed-off-by: Mark Rutland <[email protected]>
Signed-off-by: Matt Fleming <[email protected]>
Reviewed-by: Ard Biesheuvel <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Leif Lindholm <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Russell King <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

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