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>
diff --git a/arch/mips/include/asm/asmmacro.h b/arch/mips/include/asm/asmmacro.h
index 3220c93..ef066b1 100644
--- a/arch/mips/include/asm/asmmacro.h
+++ b/arch/mips/include/asm/asmmacro.h
@@ -169,6 +169,17 @@
fpu_restore_16even \thread \tmp
.endm
+#ifdef CONFIG_CPU_MIPSR2
+ .macro _EXT rd, rs, p, s
+ ext \rd, \rs, \p, \s
+ .endm
+#else /* !CONFIG_CPU_MIPSR2 */
+ .macro _EXT rd, rs, p, s
+ srl \rd, \rs, \p
+ andi \rd, \rd, (1 << \s) - 1
+ .endm
+#endif /* !CONFIG_CPU_MIPSR2 */
+
/*
* Temporary until all gas have MT ASE support
*/