使得DragonOS kernel 能为riscv64编译通过(尚未能启动) (#457)

* 使得DragonOS kernel 能为riscv64编译通过(尚未能启动)

* 修正了系统调用号声明不正确的问题，同时添加了编译配置文档

kernel/Makefile

@@ -1,17 +1,40 @@
+# 导入环境变量
+include ../env.mk
+
+export ARCH ?= x86_64
+# 如果是x86_64, 则使用x86_64-unknown-none.json作为target
+ifeq ($(ARCH), x86_64)
+	export TARGET_JSON=arch/x86_64/x86_64-unknown-none.json
+else ifeq ($(ARCH), riscv64)
+	export TARGET_JSON=riscv64imac-unknown-none-elf
+endif
+
+export CARGO_ZBUILD=-Z build-std=core,alloc,compiler_builtins -Z build-std-features=compiler-builtins-mem
+
+.PHONY: ECHO
+ECHO:
+	@echo "$@"
 
 all: 
 	@if [ -z $$DragonOS_GCC ]; then echo "\033[31m  [错误]尚未安装DragonOS交叉编译器, 请使用tools文件夹下的build_gcc_toolchain.sh脚本安装  \033[0m"; exit 1; fi
-	$(MAKE) -C src all
+	$(MAKE) -C src all ARCH=$(ARCH) || (sh -c "echo 内核编译失败" && exit 1)
 	
 
 clean:
 	rm -f Cargo.lock
-	$(MAKE) -C src clean
+	$(MAKE) -C src clean ARCH=$(ARCH)
 
 .PHONY: fmt
 fmt:
 	cargo fmt --all $(FMT_CHECK)
 
+.PHONY: check
+check: ECHO
+# @echo "Checking kernel... ARCH=$(ARCH)"
+# @exit 1
+ifeq ($(ARCH), x86_64)
+	@cargo +nightly-2023-01-21 check --workspace $(CARGO_ZBUILD) --message-format=json --target ./src/$(TARGET_JSON)
+else ifeq ($(ARCH), riscv64)
+	@cargo +nightly-2023-01-21 check --workspace $(CARGO_ZBUILD) --message-format=json --target $(TARGET_JSON)
+endif
 
-check:
-	cargo +nightly-2023-01-21 check --workspace --message-format=json --target ./src/arch/x86_64/x86_64-unknown-none.json