From bab3fdfd61b3488e1879bc3e53ac17f41d2e8b67 Mon Sep 17 00:00:00 2001
From: Miquel Sabaté Solà <mikisabate@gmail.com>
Date: Wed, 20 Nov 2024 15:40:31 +0000
Subject: linux: Add a program to test the hwprobe syscall
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RISC-V on Linux has a hwprobe system call which allows you to discover
what is supported by the running kernel.

Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
---
 arch/riscv/linux/Makefile | 60 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 arch/riscv/linux/Makefile

(limited to 'arch/riscv/linux/Makefile')

diff --git a/arch/riscv/linux/Makefile b/arch/riscv/linux/Makefile
new file mode 100644
index 0000000..9b813ff
--- /dev/null
+++ b/arch/riscv/linux/Makefile
@@ -0,0 +1,60 @@
+##
+# By default everything is silent. If you want to change this behavior, simply
+# assign V=1 when calling make.
+
+V =
+ifeq ($(strip $(V)),)
+	E = @echo
+	Q = @
+else
+	E = @\#
+	Q =
+endif
+
+##
+# Compile options. You can use CROSS_COMPILE just like on the Linux Kernel. You
+# can also determine the ISA to be used, which defaults to my VisionFive2 board.
+# I did not go too much into the rabbit hole of platform-specific flags because
+# everything is in assembly anyways and everything is statically linked. Hence
+# no `-mcpu`, no `-mtune`, no funny business.
+
+CC       = $(CROSS_COMPILE)gcc
+LD       = $(CROSS_COMPILE)ld
+ISA     ?= rv64imafdc_zicntr_zicsr_zifencei_zihpm_zca_zcd_zba_zbb
+WARNINGS = -Werror -Wpedantic -Wall -Wextra -Wcast-align -Wcast-qual -Winit-self \
+           -Wmissing-include-dirs -Wredundant-decls -Wshadow -Wsign-conversion \
+           -Wswitch-default -Wundef -Wunreachable-code -Wmissing-noreturn
+CCFLAGS  = $(WARNINGS) -march=$(ISA)
+LDFLAGS  =
+
+
+# You can pass an optional `DEBUG` variable to manipulate the build type.
+DEBUG =
+ifeq ($(strip $(DEBUG)),)
+	CCFLAGS += -O3
+else
+	CCFLAGS += -g
+endif
+
+##
+# Paths.
+
+SRC  = $(wildcard *.c)
+EXES = $(SRC:.c=)
+
+##
+# Targets
+
+.PHONY: all
+all: clean $(EXES)
+
+.PHONY: build
+build: $(EXES)
+
+.c:
+	$(E) "	CC	" $(*F)
+	$(Q) $(CC) $(CCFLAGS) $< -o $@
+
+.PHONY: clean
+clean:
+	$(Q) rm -f $(EXES)
-- 
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