fix issues

run.sh

@@ -4,4 +4,14 @@ set -xue
 # QEMU path
 QEMU=qemu-system-riscv32
 
-$QEMU -machine virt -bios default -nographic -serial mon:stdio --no-reboot
+# Path to clang and compiler flags
+CC=clang
+CFLAGS="-std=c11 -O2 -g3 -Wall -Wextra --target=riscv32-unknown-elf -fno-stack-protector -ffreestanding -nostdlib"
+
+# Build the kernel
+$CC $CFLAGS -Wl,-Tkernel.ld -Wl,-Map=kernel.map -o kernel.elf \
+    kernel.c
+
+# Start QEMU
+$QEMU -machine virt -bios default -nographic -serial mon:stdio --no-reboot \
+    -kernel kernel.elf