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MIPS: Introduce isa-rev.h to define MIPS_ISA_REV

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There are multiple instances in the kernel where we need to include or
exclude particular instructions based on the ISA revision of the target
processor. For MIPS32 / MIPS64, the compiler exports a __mips_isa_rev
define. However, when targeting MIPS I - V, this define is absent. This
leads to each use of __mips_isa_rev having to check that it is defined
first. To simplify this, introduce the isa-rev.h header which always
exports MIPS_ISA_REV. The name is changed so as to avoid confusion with
the compiler builtin and to avoid accidentally using the builtin.
MIPS_ISA_REV is defined to the compilers builtin if provided, or 0,
which satisfies all current usages.

Suggested-by: Paul Burton <paul.burton@mips.com>
Signed-off-by: Matt Redfearn <matt.redfearn@mips.com>
Reviewed-by: Maciej W. Rozycki <macro@mips.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/18676/
Signed-off-by: James Hogan <jhogan@kernel.org>
This commit is contained in:
Matt Redfearn 2018-02-26 17:02:42 +00:00 committed by James Hogan
parent 997e93d4df
commit 1690905240
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1 changed files with 24 additions and 0 deletions
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arch/mips/include/asm/isa-rev.h Normal file
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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2018 MIPS Tech, LLC
* Author: Matt Redfearn <matt.redfearn@mips.com>
*/
#ifndef __MIPS_ASM_ISA_REV_H__
#define __MIPS_ASM_ISA_REV_H__
/*
* The ISA revision level. This is 0 for MIPS I to V and N for
* MIPS{32,64}rN.
*/
/* If the compiler has defined __mips_isa_rev, believe it. */
#ifdef __mips_isa_rev
#define MIPS_ISA_REV __mips_isa_rev
#else
/* The compiler hasn't defined the isa rev so assume it's MIPS I - V (0) */
#define MIPS_ISA_REV 0
#endif
#endif /* __MIPS_ASM_ISA_REV_H__ */