On Fri, Apr 12, 2024 at 11:24:35AM -0700, Charlie Jenkins wrote: > On Fri, Apr 12, 2024 at 12:30:32PM +0100, Conor Dooley wrote: > > 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? > > Yeah, I wasn't sure how to attribute him. He wrote almost all of the > lines in this file, but I put it together into this file. What is the > standard way of doing that? The original patches have his sob and authorship, so I would at least expect co-developed-by.
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