On Thu, Apr 11, 2024 at 09:11:18PM -0700, Charlie Jenkins wrote: > These definitions didn't fit anywhere nicely, so create a new file to > house various xtheadvector instruction encodings. > > Signed-off-by: Charlie Jenkins <charlie@xxxxxxxxxxxx> > --- > arch/riscv/include/asm/xtheadvector.h | 25 +++++++++++++++++++++++++ > 1 file changed, 25 insertions(+) > > diff --git a/arch/riscv/include/asm/xtheadvector.h b/arch/riscv/include/asm/xtheadvector.h > new file mode 100644 > index 000000000000..348263ea164c > --- /dev/null > +++ b/arch/riscv/include/asm/xtheadvector.h > @@ -0,0 +1,25 @@ > +/* SPDX-License-Identifier: GPL-2.0-only */ > + > +/* > + * Vector 0.7.1 as used for example on T-Head Xuantie cores, uses an older > + * encoding for vsetvli (ta, ma vs. d1), so provide an instruction for > + * vsetvli t4, x0, e8, m8, d1 > + */ > +#define THEAD_VSETVLI_T4X0E8M8D1 ".long 0x00307ed7\n\t" > +#define THEAD_VSETVLI_X0X0E8M8D1 ".long 0x00307057\n\t" > + > +/* > + * While in theory, the vector-0.7.1 vsb.v and vlb.v result in the same > + * encoding as the standard vse8.v and vle8.v, compilers seem to optimize > + * the call resulting in a different encoding and then using a value for > + * the "mop" field that is not part of vector-0.7.1 > + * So encode specific variants for vstate_save and _restore. This wording seems oddly familiar to me, did Heiko not write this? > + */ > +#define THEAD_VSB_V_V0T0 ".long 0x02028027\n\t" > +#define THEAD_VSB_V_V8T0 ".long 0x02028427\n\t" > +#define THEAD_VSB_V_V16T0 ".long 0x02028827\n\t" > +#define THEAD_VSB_V_V24T0 ".long 0x02028c27\n\t" > +#define THEAD_VLB_V_V0T0 ".long 0x012028007\n\t" > +#define THEAD_VLB_V_V8T0 ".long 0x012028407\n\t" > +#define THEAD_VLB_V_V16T0 ".long 0x012028807\n\t" > +#define THEAD_VLB_V_V24T0 ".long 0x012028c07\n\t" > > -- > 2.44.0 >
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