[RFC PATCH 13/22] riscv: s64ilp32: Add ARCH RV64 ILP32 compiling framework

[guoren at kernel.org]

From: Guo Ren <guoren at linux.alibaba.com>

Just the same as ARCH_RV64I & ARCH_RV32I, add ARCH_RV64ILP32 config
for s64ilp32 and turn on the s64ilp32 compile switch in the
arch/riscv/Makefile.

Signed-off-by: Guo Ren <guoren at linux.alibaba.com>
Signed-off-by: Guo Ren <guoren at kernel.org>
---
 arch/riscv/Kconfig  | 6 ++++++
 arch/riscv/Makefile | 5 +++++
 2 files changed, 11 insertions(+)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 4d4fac81390f..d824fcf3cc1c 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -300,6 +300,12 @@ config ARCH_RV64I
 	select ARCH_SUPPORTS_INT128 if CC_HAS_INT128
 	select SWIOTLB if MMU
 
+config ARCH_RV64ILP32
+	bool "RV64ILP32"
+	depends on NONPORTABLE
+	select 32BIT
+	select MMU
+
 endchoice
 
 # We must be able to map all physical memory into the kernel, but the compiler
diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
index dafe958c4217..d47ba6b09b41 100644
--- a/arch/riscv/Makefile
+++ b/arch/riscv/Makefile
@@ -57,6 +57,7 @@ endif
 # ISA string setting
 riscv-march-$(CONFIG_ARCH_RV32I)	:= rv32ima
 riscv-march-$(CONFIG_ARCH_RV64I)	:= rv64ima
+riscv-march-$(CONFIG_ARCH_RV64ILP32)	:= rv64ima
 riscv-march-$(CONFIG_FPU)		:= $(riscv-march-y)fd
 riscv-march-$(CONFIG_RISCV_ISA_C)	:= $(riscv-march-y)c
 
@@ -107,7 +108,11 @@ stack_protector_prepare: prepare0
 endif
 
 # arch specific predefines for sparse
+ifeq ($(CONFIG_ARCH_RV64ILP32),y)
+CHECKFLAGS += -D__riscv
+else
 CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
+endif
 
 # Default target when executing plain make
 boot		:= arch/riscv/boot
-- 
2.36.1