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/src/Makefile

@@ -15,11 +15,21 @@ LDFLAGS_UNWIND =
 RUSTFLAGS_UNWIND =
 ifeq ($(UNWIND_ENABLE), yes)
     CFLAGS_UNWIND = -funwind-tables
+ifeq ($(ARCH), x86_64)
     LDFLAGS_UNWIND = --eh-frame-hdr
+endif
     RUSTFLAGS_UNWIND = -Cforce-unwind-tables -Clink-arg=-Wl,eh_frame.ld 
 endif
 
-CFLAGS = $(GLOBAL_CFLAGS) -fno-pie $(CFLAGS_UNWIND) -I $(shell pwd) -I $(shell pwd)/include -I $(shell pwd)/arch/x86_64/include
+RUSTFLAGS = $(RUSTFLAGS_UNWIND)
+
+CFLAGS = $(GLOBAL_CFLAGS) -fno-pie $(CFLAGS_UNWIND) -I $(shell pwd) -I $(shell pwd)/include
+
+ifeq ($(ARCH), x86_64)
+	CFLAGS +=  -I $(shell pwd)/arch/x86_64/include
+else ifeq ($(ARCH), riscv64)
+	CFLAGS +=  -I $(shell pwd)/arch/riscv64/include
+endif
 
 export ASFLAGS := --64
 
@@ -30,12 +40,47 @@ kernel_subdirs := common driver debug exception smp syscall ktest libs time
 
 
 kernel_rust:
-	RUSTFLAGS="$(RUSTFLAGS_UNWIND)" cargo +nightly-2023-01-21 build --release --target ./arch/x86_64/x86_64-unknown-none.json
+ifeq ($(ARCH), riscv64)
+	RUSTFLAGS="$(RUSTFLAGS)" cargo +nightly-2023-01-21 $(CARGO_ZBUILD) build --release --target riscv64imac-unknown-none-elf
+else
+	RUSTFLAGS="$(RUSTFLAGS)" cargo +nightly-2023-01-21 $(CARGO_ZBUILD) build --release --target $(TARGET_JSON)
+endif
 
 all: kernel
 
+# if x86_64
+ifeq ($(ARCH), x86_64)
+	$(MAKE) __link_x86_64_kernel
+else ifeq ($(ARCH), riscv64)
+	$(MAKE) __link_riscv64_kernel
+endif
+	
+	@echo "Kernel Build Done."
+
+ECHO:
+	@echo "$@"
+
+$(kernel_subdirs): ECHO
+
+	$(MAKE) -C $@ all CFLAGS="$(CFLAGS)" ASFLAGS="$(ASFLAGS)"  kernel_root_path="$(shell pwd)"
+
+kernel: $(kernel_subdirs) kernel_rust
+
+__link_riscv64_kernel:
 	@echo "Linking kernel..."
-	$(LD) -b elf64-x86-64 -z muldefs $(LDFLAGS_UNWIND) -o kernel $(shell find . -name "*.o") ../target/x86_64-unknown-none/release/libdragonos_kernel.a -T link.lds --no-relax
+	$(LD) -b elf64-littleriscv -z muldefs $(LDFLAGS_UNWIND) -o kernel $(shell find . -name "*.o") ../target/riscv64imac-unknown-none-elf/release/libdragonos_kernel.a -T arch/riscv64/link.ld --no-relax
+	$(OBJCOPY) -I elf64-littleriscv -O elf64-littleriscv -R ".eh_frame" kernel ../../bin/kernel/kernel.elf
+	rm kernel
+
+# 构建uboot的scr文件
+	@echo "Generating kernel scr file..."
+	@mkdir -p $(ROOT_PATH)/bin/sysroot/boot/
+	@mkimage -A riscv -T script -d arch/riscv64/boot/bootscript.cmd $(ROOT_PATH)/bin/sysroot/boot/boot.scr 
+
+
+__link_x86_64_kernel:
+	@echo "Linking kernel..."
+	$(LD) -b elf64-x86-64 -z muldefs $(LDFLAGS_UNWIND) -o kernel $(shell find . -name "*.o") ../target/x86_64-unknown-none/release/libdragonos_kernel.a -T arch/x86_64/link.lds --no-relax
 # 生成kallsyms
 	current_dir=$(pwd)
 	
@@ -49,7 +94,7 @@ all: kernel
 # 重新链接
 	@echo "Re-Linking kernel..."
 	@echo $(shell find . -name "*.o")
-	$(LD) -b elf64-x86-64 -z muldefs $(LDFLAGS_UNWIND) -o kernel $(shell find . -name "*.o") ../target/x86_64-unknown-none/release/libdragonos_kernel.a ./debug/kallsyms.o  -T link.lds --no-relax
+	$(LD) -b elf64-x86-64 -z muldefs $(LDFLAGS_UNWIND) -o kernel $(shell find . -name "*.o") ../target/x86_64-unknown-none/release/libdragonos_kernel.a ./debug/kallsyms.o  -T arch/x86_64/link.lds --no-relax
 	@echo "Generating kernel ELF file..."
 # 生成内核文件
 ifeq ($(UNWIND_ENABLE), yes)
@@ -57,21 +102,10 @@ ifeq ($(UNWIND_ENABLE), yes)
 else
 	$(OBJCOPY) -I elf64-x86-64 -O elf64-x86-64 -R ".eh_frame" kernel ../../bin/kernel/kernel.elf
 endif
-	@echo "Kernel Build Done."
-
-ECHO:
-	@echo "$@"
-
-$(kernel_subdirs): ECHO
-
-	$(MAKE) -C $@ all CFLAGS="$(CFLAGS)" ASFLAGS="$(ASFLAGS)"  kernel_root_path="$(shell pwd)"
-
-kernel: $(kernel_subdirs) kernel_rust
-	
-
+	rm kernel
 
 clean: 
-	cargo clean
+	@cargo clean
 	rm -rf $(GARBAGE)
 	@list='$(kernel_subdirs)'; for subdir in $$list; do \
 		echo "Clean in dir: $$subdir";\