From: Mark Brown <broonie@kernel.org>
To: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Shuah Khan <skhan@linuxfoundation.org>,
Shuah Khan <shuah@kernel.org>
Cc: Alan Hayward <alan.hayward@arm.com>,
Luis Machado <luis.machado@arm.com>,
Salil Akerkar <Salil.Akerkar@arm.com>,
Basant Kumar Dwivedi <Basant.KumarDwivedi@arm.com>,
Szabolcs Nagy <szabolcs.nagy@arm.com>,
linux-arm-kernel@lists.infradead.org,
linux-kselftest@vger.kernel.org, Mark Brown <broonie@kernel.org>
Subject: [PATCH v4 08/33] arm64/sme: Define macros for manually encoding SME instructions
Date: Thu, 21 Oct 2021 19:06:57 +0100 [thread overview]
Message-ID: <20211021180722.3699248-9-broonie@kernel.org> (raw)
In-Reply-To: <20211021180722.3699248-1-broonie@kernel.org>
As with SVE rather than impose ambitious toolchain requirements for SME we
manually encode the few instructions which we require in order to perform
the work the kernel needs to do. That is currently:
- Vector store and load for the ZA array.
- Zeroing of the whole ZA array.
This does not include the SMSTART and SMSTOP instructions which are
single instructions and only used from C code, a later patch will define
them as inline assembly.
Signed-off-by: Mark Brown <broonie@kernel.org>
---
arch/arm64/include/asm/fpsimdmacros.h | 44 +++++++++++++++++++++++++++
1 file changed, 44 insertions(+)
diff --git a/arch/arm64/include/asm/fpsimdmacros.h b/arch/arm64/include/asm/fpsimdmacros.h
index 2509d7dde55a..f9fb5f111758 100644
--- a/arch/arm64/include/asm/fpsimdmacros.h
+++ b/arch/arm64/include/asm/fpsimdmacros.h
@@ -93,6 +93,12 @@
.endif
.endm
+.macro _sme_check_wv v
+ .if (\v) < 12 || (\v) > 15
+ .error "Bad vector select register \v."
+ .endif
+.endm
+
/* SVE instruction encodings for non-SVE-capable assemblers */
/* (pre binutils 2.28, all kernel capable clang versions support SVE) */
@@ -174,6 +180,44 @@
| (\np)
.endm
+/* SME instruction encodings for non-SME-capable assemblers */
+
+/*
+ * STR (vector from ZA array):
+ * STR ZA[\nw, #\offset], [X\nxbase, #\offset, MUL VL]
+ */
+.macro _sme_str_zav nw, nxbase, offset=0
+ _sme_check_wv \nw
+ _check_general_reg \nxbase
+ _check_num (\offset), -0x100, 0xff
+ .inst 0xe1200000 \
+ | (((\nw) & 3) << 13) \
+ | ((\nxbase) << 5) \
+ | ((\offset) & 7)
+.endm
+
+/*
+ * LDR (vector to ZA array):
+ * LDR ZA[\nw, #\offset], [X\nxbase, #\offset, MUL VL]
+ */
+.macro _sme_ldr_zav nw, nxbase, offset=0
+ _sme_check_wv \nw
+ _check_general_reg \nxbase
+ _check_num (\offset), -0x100, 0xff
+ .inst 0xe1000000 \
+ | (((\nw) & 3) << 13) \
+ | ((\nxbase) << 5) \
+ | ((\offset) & 7)
+.endm
+
+/*
+ * Zero the entire ZA array
+ * ZERO ZA
+ */
+.macro zero_za
+ .inst 0xc00800ff
+.endm
+
.macro __for from:req, to:req
.if (\from) == (\to)
_for__body %\from
--
2.30.2
next prev parent reply other threads:[~2021-10-21 18:08 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-21 18:06 [PATCH v4 00/33] arm64/sme: Initial support for the Scalable Matrix Extension Mark Brown
2021-10-21 18:06 ` [PATCH v4 01/33] arm64/sve: Make sysctl interface for SVE reusable by SME Mark Brown
2021-10-21 18:06 ` [PATCH v4 02/33] arm64/sve: Generalise vector length configuration prctl() for SME Mark Brown
2021-10-21 18:06 ` [PATCH v4 03/33] kselftest/arm64: Parameterise ptrace vector length information Mark Brown
2021-10-21 18:06 ` [PATCH v4 04/33] kselftest/arm64: Allow signal tests to trigger from a function Mark Brown
2021-10-21 18:06 ` [PATCH v4 05/33] tools/nolibc: Implement gettid() Mark Brown
2021-10-21 18:06 ` [PATCH v4 06/33] arm64/sme: Provide ABI documentation for SME Mark Brown
[not found] ` <VI1PR08MB3919C2F171F2185FB3500DD08B839@VI1PR08MB3919.eurprd08.prod.outlook.com>
2021-10-26 13:47 ` Mark Brown
2021-10-27 11:14 ` Szabolcs Nagy
2021-10-21 18:06 ` [PATCH v4 07/33] arm64/sme: System register and exception syndrome definitions Mark Brown
2021-10-21 18:06 ` Mark Brown [this message]
2021-10-21 18:06 ` [PATCH v4 09/33] arm64/sme: Early CPU setup for SME Mark Brown
2021-10-21 18:06 ` [PATCH v4 10/33] arm64/sme: Basic enumeration support Mark Brown
2021-10-21 18:07 ` [PATCH v4 11/33] arm64/sme: Identify supported SME vector lengths at boot Mark Brown
2021-10-21 18:07 ` [PATCH v4 12/33] arm64/sme: Implement sysctl to set the default vector length Mark Brown
2021-10-21 18:07 ` [PATCH v4 13/33] arm64/sme: Implement vector length configuration prctl()s Mark Brown
2021-10-21 18:07 ` [PATCH v4 14/33] arm64/sme: Implement support for TPIDR2 Mark Brown
2021-10-21 18:07 ` [PATCH v4 15/33] arm64/sme: Implement SVCR context switching Mark Brown
2021-10-21 18:07 ` [PATCH v4 16/33] arm64/sme: Implement streaming SVE " Mark Brown
2021-10-21 18:07 ` [PATCH v4 17/33] arm64/sme: Implement ZA " Mark Brown
2021-10-21 18:07 ` [PATCH v4 18/33] arm64/sme: Implement traps and syscall handling for SME Mark Brown
2021-10-21 18:07 ` [PATCH v4 19/33] arm64/sme: Implement streaming SVE signal handling Mark Brown
2021-10-21 18:07 ` [PATCH v4 20/33] arm64/sme: Implement ZA " Mark Brown
2021-10-21 18:07 ` [PATCH v4 21/33] arm64/sme: Implement ptrace support for streaming mode SVE registers Mark Brown
2021-10-21 18:07 ` [PATCH v4 22/33] arm64/sme: Add ptrace support for ZA Mark Brown
2021-10-21 18:07 ` [PATCH v4 23/33] arm64/sme: Disable streaming mode and ZA when flushing CPU state Mark Brown
2021-10-21 18:07 ` [PATCH v4 24/33] arm64/sme: Save and restore streaming mode over EFI runtime calls Mark Brown
2021-10-21 18:07 ` [PATCH v4 25/33] arm64/sme: Provide Kconfig for SME Mark Brown
2021-10-21 18:07 ` [PATCH v4 26/33] kselftest/arm64: sme: Add streaming SME support to vlset Mark Brown
2021-10-21 18:07 ` [PATCH v4 27/33] kselftest/arm64: Add tests for TPIDR2 Mark Brown
2021-10-21 18:07 ` [PATCH v4 28/33] kselftest/arm64: Extend vector configuration API tests to cover SME Mark Brown
2021-10-21 18:07 ` [PATCH v4 29/33] kselftest/arm64: sme: Provide streaming mode SVE stress test Mark Brown
2021-10-21 18:07 ` [PATCH v4 30/33] kselftest/arm64: Add stress test for SME ZA context switching Mark Brown
2021-10-21 18:07 ` [PATCH v4 31/33] kselftest/arm64: signal: Add SME signal handling tests Mark Brown
2021-10-21 18:07 ` [PATCH v4 32/33] kselftest/arm64: Add streaming SVE to SVE ptrace tests Mark Brown
2021-10-21 18:07 ` [PATCH v4 33/33] kselftest/arm64: Add coverage for the ZA ptrace interface Mark Brown
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