From 0a5466d8d53bc8045ff56ff76cc1880aa85761c2 Mon Sep 17 00:00:00 2001
From: "ustcymgu@gmail.com" <ustcymgu@gmail.com>
Date: Sat, 19 Nov 2022 14:02:55 +0000
Subject: RISC-V 32-bit support

Added 32-bit RISC-V support. I have managed to get 32-bit RISC-V No-MMU
Linux running based on mainstream buildroot. It's nice to have uclibc
support this 32-bit No-MMU target.

There's no substantial code change except definations and config
options.

Signed-off-by: Yimin Gu <ustcymgu@gmail.com>
---
 extra/Configs/Config.in      |  9 +++++++++
 extra/Configs/Config.riscv32 | 14 ++++++++++++++
 2 files changed, 23 insertions(+)
 create mode 100644 extra/Configs/Config.riscv32

(limited to 'extra')

diff --git a/extra/Configs/Config.in b/extra/Configs/Config.in
index 1c41d77ff..6bbb6f572 100644
--- a/extra/Configs/Config.in
+++ b/extra/Configs/Config.in
@@ -39,6 +39,7 @@ choice
 	default TARGET_or1k if DESIRED_TARGET_ARCH = "or1k"
 	default TARGET_powerpc if DESIRED_TARGET_ARCH = "powerpc"
 	default TARGET_riscv64 if DESIRED_TARGET_ARCH = "riscv64"
+	default TARGET_riscv32 if DESIRED_TARGET_ARCH = "riscv32"
 	default TARGET_sh if DESIRED_TARGET_ARCH = "sh"
 	default TARGET_sparc if DESIRED_TARGET_ARCH = "sparc"
 	default TARGET_sparc64 if DESIRED_TARGET_ARCH = "sparc64"
@@ -125,6 +126,9 @@ config TARGET_powerpc
 config TARGET_riscv64
 	bool "riscv64"
 
+config TARGET_riscv32
+	bool "riscv32"
+
 config TARGET_sh
 	bool "superh"
 
@@ -260,6 +264,10 @@ if TARGET_riscv64
 source "extra/Configs/Config.riscv64"
 endif
 
+if TARGET_riscv32
+source "extra/Configs/Config.riscv32"
+endif
+
 if TARGET_sh
 source "extra/Configs/Config.sh"
 endif
@@ -565,6 +573,7 @@ config UCLIBC_HAS_LINUXTHREADS
 	select UCLIBC_HAS_REALTIME
 	depends on !TARGET_aarch64 && \
 		   !TARGET_riscv64 && \
+		   !TARGET_riscv32 && \
 		   !TARGET_metag
 	help
 	  If you want to compile uClibc with Linuxthreads support, then answer Y.
diff --git a/extra/Configs/Config.riscv32 b/extra/Configs/Config.riscv32
new file mode 100644
index 000000000..304d30f70
--- /dev/null
+++ b/extra/Configs/Config.riscv32
@@ -0,0 +1,14 @@
+#
+# For a description of the syntax of this configuration file,
+# see extra/config/Kconfig-language.txt
+#
+
+config TARGET_ARCH
+	string
+	default "riscv32"
+
+config FORCE_OPTIONS_FOR_ARCH
+	bool
+	default y
+	select ARCH_LITTLE_ENDIAN
+	select ARCH_HAS_MMU
-- 
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