target-arm: Use correct memory attributes for page table walks
Factor out the page table walk memory accesses into their own function, so that we can specify the correct S/NS memory attributes for them. This will also provide a place to use the correct endianness and handle the need for a stage-2 translation when virtualization is supported. Signed-off-by: NPeter Maydell <peter.maydell@linaro.org> Reviewed-by: NEdgar E. Iglesias <edgar.iglesias@xilinx.com> Reviewed-by: NAlex Bennée <alex.bennee@linaro.org>
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