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MIPS: Introduce _EXT assembler macro

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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>
This commit is contained in:
Paul Burton 2014-01-15 10:31:49 +00:00 committed by Ralf Baechle
parent 6d9727a7a5
commit 1d68808748
1 changed files with 11 additions and 0 deletions
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11
arch/mips/include/asm/asmmacro.h
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@ -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
*/