buildtools: feat #135: Check the version of QEMU ahead

os/Makefile

@@ -90,20 +90,23 @@ fdt:
  @qemu-system-riscv64 -M 128m -machine virt,dumpdtb=virt.out
  fdtdump virt.out
 
-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 fs-img gdbserver gdbclient fdt
+.PHONY: build env kernel clean disasm disasm-vim run-inner fs-img gdbserver gdbclient fdt qemu-version-check

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