MIPS: Introduce _EXT assembler macro
This patch adds a simple macro to wrap the ext instruction which was introduced with MIPSR2, and fall back to a shift & and pair for pre-MIPSR2 CPUs. This will be used in a subsequent patch. Signed-off-by: Paul Burton <paul.burton@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/6358/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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