diff options
| author | Jiaxun Yang <jiaxun.yang@flygoat.com> | 2020-01-13 13:16:11 +0300 |
|---|---|---|
| committer | Paul Burton <paulburton@kernel.org> | 2020-01-23 02:56:08 +0300 |
| commit | ece276de2a1f90b6a7836d388c372b9025345469 (patch) | |
| tree | 7a1a50ccc9502f153efd87015a51a2c8fdb9b961 /arch/mips/include/asm/mipsregs.h | |
| parent | 0a3d5b577784e93ae1b21aff4c1f150eca25813a (diff) | |
| download | linux-ece276de2a1f90b6a7836d388c372b9025345469.tar.xz | |
MIPS: Add MAC2008 Support
MAC2008 means the processor implemented IEEE754 style Fused MADD
instruction. It was introduced in Release3 but removed in Release5.
The toolchain support of MAC2008 have never landed except for Loongson
processors.
This patch aimed to disabled the MAC2008 if it's optional. For
MAC2008 only processors, we corrected math-emu behavior to align
with actual hardware behavior.
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
[paulburton@kernel.org: Fixup MIPSr2-r5 check in cpu_set_fpu_2008.]
Signed-off-by: Paul Burton <paulburton@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: chenhc@lemote.com
Cc: paul.burton@mips.com
Cc: linux-kernel@vger.kernel.org
Diffstat (limited to 'arch/mips/include/asm/mipsregs.h')
| -rw-r--r-- | arch/mips/include/asm/mipsregs.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/mips/include/asm/mipsregs.h b/arch/mips/include/asm/mipsregs.h index 0d5a30988697..796fe47cfd17 100644 --- a/arch/mips/include/asm/mipsregs.h +++ b/arch/mips/include/asm/mipsregs.h @@ -1101,9 +1101,12 @@ /* * Bits 22:20 of the FPU Status Register will be read as 0, * and should be written as zero. + * MAC2008 was removed in Release 5 so we still treat it as + * reserved. */ #define FPU_CSR_RSVD (_ULCAST_(7) << 20) +#define FPU_CSR_MAC2008 (_ULCAST_(1) << 20) #define FPU_CSR_ABS2008 (_ULCAST_(1) << 19) #define FPU_CSR_NAN2008 (_ULCAST_(1) << 18) |