linux-kernel - [RFC PATCH V2 24/38] riscv: s64ilp32: Add TImode (128 int) support

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Message-Id: <20231112061514.2306187-25-guoren@kernel.org>
Date:   Sun, 12 Nov 2023 01:15:00 -0500
From:   guoren@...nel.org
To:     arnd@...db.de, guoren@...nel.org, palmer@...osinc.com,
        tglx@...utronix.de, conor.dooley@...rochip.com, heiko@...ech.de,
        apatel@...tanamicro.com, atishp@...shpatra.org, bjorn@...nel.org,
        paul.walmsley@...ive.com, anup@...infault.org, jiawei@...as.ac.cn,
        liweiwei@...as.ac.cn, wefu@...hat.com, U2FsdGVkX1@...il.com,
        wangjunqiang@...as.ac.cn, kito.cheng@...ive.com,
        andy.chiu@...ive.com, vincent.chen@...ive.com,
        greentime.hu@...ive.com, wuwei2016@...as.ac.cn, jrtc27@...c27.com,
        luto@...nel.org, fweimer@...hat.com, catalin.marinas@....com,
        hjl.tools@...il.com
Cc:     linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org, Guo Ren <guoren@...ux.alibaba.com>
Subject: [RFC PATCH V2 24/38] riscv: s64ilp32: Add TImode (128 int) support

From: Guo Ren <guoren@...ux.alibaba.com>

The s64ilp32 uses 64bit compiler, so it could support “Tetra
Integer” mode, which represents a sixteen-byte (128) integer.

It's the first 32BIT linux support TImode :)

Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
Signed-off-by: Guo Ren <guoren@...nel.org>
---
 arch/riscv/Kconfig      | 1 +
 arch/riscv/lib/Makefile | 1 +
 2 files changed, 2 insertions(+)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 0fc03aa076e6..a45e31ef3b2c 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -339,6 +339,7 @@ config ARCH_RV64I
 config ARCH_RV64ILP32
 	bool "RV64ILP32"
 	depends on NONPORTABLE
+	select ARCH_SUPPORTS_INT128 if !$(cc-option,$(m64-flag) -D__SIZEOF_INT128__=0)
 	select 32BIT
 	select MMU
 	select VDSO64ILP32
diff --git a/arch/riscv/lib/Makefile b/arch/riscv/lib/Makefile
index 26cb2502ecf8..68af463795e1 100644
--- a/arch/riscv/lib/Makefile
+++ b/arch/riscv/lib/Makefile
@@ -9,5 +9,6 @@ lib-y			+= strncmp.o
 lib-$(CONFIG_MMU)	+= uaccess.o
 lib-$(CONFIG_64BIT)	+= tishift.o
 lib-$(CONFIG_RISCV_ISA_ZICBOZ)	+= clear_page.o
+lib-$(CONFIG_ARCH_RV64ILP32) += tishift.o
 
 obj-$(CONFIG_FUNCTION_ERROR_INJECTION) += error-inject.o
-- 
2.36.1