From 2b93d53f62bfb7420dc12f6fa2cf01edb397feed Mon Sep 17 00:00:00 2001
From: Yifan Wu <shinbokuow@163.com>
Date: Sun, 14 Jul 2024 20:50:53 +0800
Subject: [PATCH] buildtools: feat #135: Check the version of QEMU ahead

---
 os/Makefile                  | 12 ++++++++----
 os/scripts/qemu-ver-check.sh | 26 ++++++++++++++++++++++++++
 2 files changed, 34 insertions(+), 4 deletions(-)
 create mode 100644 os/scripts/qemu-ver-check.sh

diff --git a/os/Makefile b/os/Makefile
index 460f6f22..a4c7967d 100644
--- a/os/Makefile
+++ b/os/Makefile
@@ -61,19 +61,23 @@ QEMU_ARGS := -machine virt \
 			 -bios $(BOOTLOADER) \
 			 -device loader,file=$(KERNEL_BIN),addr=$(KERNEL_ENTRY_PA)
 
-run-inner: build
+QEMU_NAME := qemu-system-riscv64
+qemu-version-check:
+	@sh scripts/qemu-ver-check.sh $(QEMU_NAME)
+
+run-inner: qemu-version-check build
 	@qemu-system-riscv64 $(QEMU_ARGS)
 
-debug: build
+debug: qemu-version-check build
 	@tmux new-session -d \
 		"qemu-system-riscv64 $(QEMU_ARGS) -s -S" && \
 		tmux split-window -h "riscv64-unknown-elf-gdb -ex 'file $(KERNEL_ELF)' -ex 'set arch riscv:rv64' -ex 'target remote localhost:1234'" && \
 		tmux -2 attach-session -d
 
-gdbserver: build
+gdbserver: qemu-version-check build
 	@qemu-system-riscv64 $(QEMU_ARGS) -s -S
 
 gdbclient:
 	@riscv64-unknown-elf-gdb -ex 'file $(KERNEL_ELF)' -ex 'set arch riscv:rv64' -ex 'target remote localhost:1234'
 
-.PHONY: build env kernel clean disasm disasm-vim run-inner gdbserver gdbclient
+.PHONY: build env kernel clean disasm disasm-vim run-inner gdbserver gdbclient qemu-version-check
diff --git a/os/scripts/qemu-ver-check.sh b/os/scripts/qemu-ver-check.sh
new file mode 100644
index 00000000..8c20456c
--- /dev/null
+++ b/os/scripts/qemu-ver-check.sh
@@ -0,0 +1,26 @@
+#!/bin/sh
+
+# Argument1: The filename of qemu executable, e.g. qemu-system-riscv64
+QEMU_PATH=$(which $1)
+RET=$?
+MINIMUM_MAJOR_VERSION=7
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+NC='\033[0m'
+if [ $RET != 0 ]
+then
+    echo "$1 not found"
+    exit 1
+else
+    QEMU_VERSION=$($1 --version|head -n 1|awk '{print $4}')
+    MAJOR_VERSION=$(echo $QEMU_VERSION|cut -c1-1)
+    if [ $MAJOR_VERSION -lt $MINIMUM_MAJOR_VERSION ]
+    then
+        echo "${RED}Error: Required major version of QEMU is ${MINIMUM_MAJOR_VERSION}, " \
+             "but current is ${QEMU_VERSION}.${NC}"
+        exit 1
+    else
+        echo "${GREEN}QEMU version is ${QEMU_VERSION}(>=${MINIMUM_MAJOR_VERSION}), OK!${NC}"
+        exit 0
+    fi
+fi