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Re: [PATCH 07/27] arm64/sve: Low-level SVE architectural state manipulation functions

• From: Dave Martin <Dave dot Martin at arm dot com>
• To: Alex Bennée <alex dot bennee at linaro dot org>
• Cc: linux-arch at vger dot kernel dot org, libc-alpha at sourceware dot org,Ard Biesheuvel <ard dot biesheuvel at linaro dot org>,Szabolcs Nagy <szabolcs dot nagy at arm dot com>,Catalin Marinas <catalin dot marinas at arm dot com>,Will Deacon <will dot deacon at arm dot com>,Richard Sandiford <richard dot sandiford at arm dot com>,kvmarm at lists dot cs dot columbia dot edu, linux-arm-kernel at lists dot infradead dot org
• Date: Mon, 21 Aug 2017 15:38:18 +0100
• Subject: Re: [PATCH 07/27] arm64/sve: Low-level SVE architectural state manipulation functions
• Authentication-results: sourceware.org; auth=none
• References: <1502280338-23002-1-git-send-email-Dave.Martin@arm.com> <1502280338-23002-8-git-send-email-Dave.Martin@arm.com> <878tid5ixn.fsf@linaro.org>

On Mon, Aug 21, 2017 at 11:11:48AM +0100, Alex Bennée wrote:> > Dave Martin <Dave.Martin@arm.com> writes:> > > Manipulating the SVE architectural state, including the vector and> > predicate registers, first-fault register and the vector length,> > requires the use of dedicated instructions added by SVE.> >> > This patch adds suitable assembly functions for saving and> > restoring the SVE registers and querying the vector length.> > Setting of the vector length is done as part of register restore.> >> > Since people building kernels may not all get an SVE-enabled> > toolchain for a while, this patch uses macros that generate> > explicit opcodes in place of assembler mnemonics.> >> > Signed-off-by: Dave Martin <Dave.Martin@arm.com>> > ---> >  arch/arm64/include/asm/fpsimd.h       |   5 ++> >  arch/arm64/include/asm/fpsimdmacros.h | 137 ++++++++++++++++++++++++++++++++++> >  arch/arm64/kernel/entry-fpsimd.S      |  17 +++++> >  3 files changed, 159 insertions(+)[...]> > diff --git a/arch/arm64/include/asm/fpsimdmacros.h b/arch/arm64/include/asm/fpsimdmacros.h> > index 0f5fdd3..5023064 100644> > --- a/arch/arm64/include/asm/fpsimdmacros.h> > +++ b/arch/arm64/include/asm/fpsimdmacros.h[...]> > +.macro _sve_str_v nz, nxbase, offset=0> > +_sve_check_zreg \nz> > +_check_general_reg \nxbase> > +_check_num (\offset), -0x100, 0xff> > +.inst0xe5804000\> > +| (\nz)\> > +| ((\nxbase) << 5)\> > +| (((\offset) & 7) << 10)\> > +| (((\offset) & 0x1f8) << 13)> > +.endm> > Can we have references to the ARM ARM titles (the section numbers keep> changing) for each hand-hacked instruction please. Otherwise it is> impossible to verify each one.That's fair -- will do.The supplement didn't exist at the time I first wrote this code...[...]Cheers---Dave

• References:
  • [PATCH 00/27] ARM Scalable Vector Extension (SVE)
    • From: Dave Martin
  • [PATCH 07/27] arm64/sve: Low-level SVE architectural state manipulation functions
    • From: Dave Martin
  • Re: [PATCH 07/27] arm64/sve: Low-level SVE architectural state manipulation functions
    • From: Alex Bennée