target-arm: add async excp target_el function
Adds a dedicated function and a lookup table for determining the target exception level of IRQ and FIQ exceptions. The lookup table is taken from the ARMv7 and ARMv8 specification exception routing tables. Signed-off-by: NGreg Bellows <greg.bellows@linaro.org> Reviewed-by: NPeter Maydell <peter.maydell@linaro.org> Message-id: 1416242878-876-3-git-send-email-greg.bellows@linaro.org Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
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