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[RFC,16/22] riscv: s64ilp32: Add TImode (128 int) support

Message ID 20230518131013.3366406-17-guoren@kernel.org (mailing list archive)
State Not Applicable
Headers show
Series riscv: s64ilp32: Running 32-bit Linux kernel on 64-bit supervisor mode | expand

Checks

Context Check Description
conchuod/tree_selection fail Failed to apply to next/pending-fixes, riscv/for-next or riscv/master

Commit Message

Guo Ren May 18, 2023, 1:10 p.m. UTC 
From: Guo Ren <guoren@linux.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@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
---
 arch/riscv/Kconfig      | 1 +
 arch/riscv/lib/Makefile | 1 +
 2 files changed, 2 insertions(+)
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Patch

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 33fe624ef6d3..e0c3dee68510 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -305,6 +305,7 @@  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
 
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