Add bbl as bootloader

Cargo.toml

@@ -38,5 +38,8 @@ simple-filesystem = { git = "https://github.com/wangrunji0408/SimpleFileSystem-R
 bit-allocator = { path = "crate/bit-allocator" }
 ucore-memory = { path = "crate/memory" }
 
+[target.riscv32i-unknown-none.dependencies]
+riscv = { git = "https://github.com/riscv-rust/riscv" }
+
 [build-dependencies]
 cc = "1.0"

Makefile

@@ -1,5 +1,6 @@
 # Examples:
 # 	make run					Run in debug
+# 	make justrun				Run in debug without build
 #	make run int=1				Run with interrupt info by QEMU
 # 	make run mode=release		Run in release
 #	make run LOG=error			Run with log level: error
@@ -8,15 +9,15 @@
 # 	make asm					Open the deassemble file of the last build
 # 	make clean					Clean
 
-arch ?= riscv
+arch ?= riscv32
 kernel := build/kernel-$(arch).bin
 iso := build/os-$(arch).iso
 target ?= $(arch)-blog_os
-ifeq ($(arch), riscv)
+ifeq ($(arch), riscv32)
 target := riscv32i-unknown-none
 endif
 mode ?= debug
-rust_os := target/$(target)/$(mode)/librust_ucore.a
+rust_lib := target/$(target)/$(mode)/librust_ucore.a
 
 boot_src := src/arch/$(arch)/boot
 linker_script := $(boot_src)/linker.ld
@@ -28,6 +29,9 @@ user_image_files := $(wildcard user/*.img)
 user_object_files := $(patsubst user/%.img, build/user/%.o, $(user_image_files))
 SFSIMG := user/ucore32.img
 qemu_opts := -cdrom $(iso) -smp 4 -serial mon:stdio -drive file=$(SFSIMG),media=disk,cache=writeback
+ifeq ($(arch), riscv32)
+qemu_opts := -machine virt -kernel $(iso) -nographic
+endif
 features := use_apic
 
 LOG ?= debug
@@ -65,17 +69,18 @@ else
 uname := $(shell uname)
 endif
 
-ifeq ($(uname), Linux)
-prefix :=
-else
+ifeq ($(uname), Darwin)
 prefix := x86_64-elf-
 endif
+ifeq ($(arch), riscv32)
+prefix := riscv32-unknown-elf-
+endif
 
 ld := $(prefix)ld
 objdump := $(prefix)objdump
 cc := $(prefix)gcc
 
-.PHONY: all clean run iso kernel build asm doc
+.PHONY: all clean run iso build asm doc justrun
 
 all: $(kernel)
 
@@ -85,7 +90,9 @@ clean:
 doc:
 	@cargo rustdoc -- --document-private-items
 
-run: $(iso)
+run: $(iso) justrun
+
+justrun:
 	@qemu-system-$(arch) $(qemu_opts) || [ $$? -eq 11 ] # run qemu and assert it exit 11
 
 debug: $(iso)
@@ -98,22 +105,35 @@ build: iso
 asm:
 	@$(objdump) -dS $(kernel) | less
 
-$(iso): $(kernel) $(grub_cfg)
+build/os-x86_64.iso: $(kernel) $(grub_cfg)
 	@mkdir -p build/isofiles/boot/grub
 	@cp $(kernel) build/isofiles/boot/kernel.bin
 	@cp $(grub_cfg) build/isofiles/boot/grub
 	@grub-mkrescue -o $(iso) build/isofiles 2> /dev/null
 	@rm -r build/isofiles
 
-$(kernel): kernel $(rust_os) $(assembly_object_files) $(linker_script)
+build/os-riscv32.iso: $(kernel)
+	@cd riscv-pk && \
+	 mkdir -p build && \
+	 cd build && \
+	 ../configure \
+	 	--enable-logo \
+	 	--prefix=$(RISCV) \
+	 	--disable-fp-emulation \
+	 	--host=riscv32-unknown-elf \
+	 	--with-payload=../../build/kernel-riscv32.bin && \
+	 make && \
+	 cp bbl ../../$@
+
+$(kernel): $(rust_lib) $(assembly_object_files) $(linker_script)
 	@$(ld) -n --gc-sections -T $(linker_script) -o $(kernel) \
-		$(assembly_object_files) $(rust_os)
+		$(assembly_object_files) $(rust_lib)
 
-kernel:
+$(rust_lib):
 	@RUST_TARGET_PATH=$(shell pwd) CC=$(cc) xargo build $(build_args)
 
 # compile assembly files
-build/arch/$(arch)/boot/%.o: $(boot_src)/%.asm
+build/arch/x86_64/boot/%.o: $(boot_src)/%.asm
 	@mkdir -p $(shell dirname $@)
 	@nasm -felf64 $< -o $@
 

README.md

@@ -1,5 +1,15 @@
 # RustOS for x86_64 SMP
 
+## Port to RISCV (WIP)
+
+2018年计算机系统综合实验
+
+[Project Wiki](http://os.cs.tsinghua.edu.cn/oscourse/csproject2018/group05)
+
+[Documents](./docs/RISCV.md)
+
+## Summary
+
 [![Build Status](https://travis-ci.org/wangrunji0408/RustOS.svg?branch=master)](https://travis-ci.org/wangrunji0408/RustOS)
 
 A project of THU OS2018 spring.

build.rs

@@ -4,12 +4,14 @@ use std::fs::File;
 use std::io::{Write, Result};
 
 fn main() {
-    cc::Build::new()
-		.file("src/arch/x86_64/driver/apic/lapic.c")
-		.file("src/arch/x86_64/driver/keyboard/keyboard.c")
-		.flag("-mcmodel=large")
-		.compile("cobj");
-	gen_vector_asm().unwrap();
+	if std::env::var("TARGET").unwrap().starts_with("x86_64") {
+		cc::Build::new()
+			.file("src/arch/x86_64/driver/apic/lapic.c")
+			.file("src/arch/x86_64/driver/keyboard/keyboard.c")
+			.flag("-mcmodel=large")
+			.compile("cobj");
+		gen_vector_asm().unwrap();
+	}
 }
 
 fn gen_vector_asm() -> Result<()> {

docs/RISCV.md

@@ -0,0 +1,15 @@
+# RISCV 移植记录
+
+## 开发环境
+
+* [riscv-rust/rust](https://github.com/riscv-rust/rust)：使用[官方发布的二进制版本+源码](https://github.com/riscv-rust/rust/releases/tag/riscv-rust-1.26.0-1-dev)
+* [riscv-gnu-toolchain](https://github.com/riscv/riscv-gnu-toolchain)：使用OS2018腾讯云中使用的预编译版本
+
+具体配置过程详见[Dockerfile](../riscv-env/Dockerfile)
+
+## BootLoader
+
+参考[bbl-ucore](https://github.com/ring00/bbl-ucore)及后续的[ucore_os_lab for RISCV32](https://github.com/chyyuu/ucore_os_lab/tree/riscv32-priv-1.10)，使用[bbl](https://github.com/riscv/riscv-pk.git)作为BootLoader。
+
+然而官方版本和bbl-ucore中的fork版本都无法正常编译，使用的是[ucore_os_lab中的修改版本](https://github.com/chyyuu/ucore_os_lab/tree/riscv32-priv-1.10/riscv-pk)。
+

src/arch/riscv32/boot/entry.S

@@ -0,0 +1,18 @@
+    .section .text,"ax",%progbits
+    .globl kern_entry
+kern_entry:
+    # la sp, bootstacktop
+    auipc sp, %hi(bootstacktop)
+    addi sp, sp, %lo(bootstacktop)
+
+    # tail rust_main
+    auipc t1, %hi(rust_main)
+    jalr zero, t1, %lo(rust_main)
+
+.section .data
+    .align 12  #PGSHIFT
+    .global bootstack
+bootstack:
+    .space 4096 * 8  #KSTACKSIZE
+    .global bootstacktop
+bootstacktop:

src/arch/riscv32/boot/linker.ld

@@ -0,0 +1,53 @@
+/* Copy from bbl-ucore : https://ring00.github.io/bbl-ucore      */
+
+/* Simple linker script for the ucore kernel.
+   See the GNU ld 'info' manual ("info ld") to learn the syntax. */
+
+OUTPUT_ARCH(riscv)
+ENTRY(kern_entry)
+
+BASE_ADDRESS = 0xC0000000;
+
+SECTIONS
+{
+    /* Load the kernel at this address: "." means the current address */
+    . = BASE_ADDRESS;
+
+    .text : {
+        *(.text.kern_entry .text .stub .text.* .gnu.linkonce.t.*)
+    }
+
+    PROVIDE(etext = .); /* Define the 'etext' symbol to this value */
+
+    .rodata : {
+        *(.rodata .rodata.* .gnu.linkonce.r.*)
+    }
+
+    /* Adjust the address for the data segment to the next page */
+    . = ALIGN(0x1000);
+
+    /* The data segment */
+    .data : {
+        *(.data)
+        *(.data.*)
+    }
+
+    .sdata : {
+        *(.sdata)
+        *(.sdata.*)
+    }
+
+    PROVIDE(edata = .);
+
+    .bss : {
+        *(.bss)
+        *(.bss.*)
+        *(.sbss*)
+    }
+
+    PROVIDE(end = .);
+
+    /DISCARD/ : {
+        *(.eh_frame .note.GNU-stack)
+    }
+}

src/arch/riscv32/mod.rs

@@ -0,0 +1,3 @@
+global_asm!(include_str!("boot/entry.S"));
+
+extern crate riscv;

src/lib.rs

@@ -15,6 +15,7 @@
 #![feature(panic_implementation)]
 #![feature(panic_info_message)]
 #![feature(universal_impl_trait)]
+#![feature(global_asm)]
 #![no_std]
 
 
@@ -94,6 +95,16 @@ mod sync;
 #[path = "arch/x86_64/mod.rs"]
 mod arch;
 
+#[cfg(target_arch = "riscv")]
+#[path = "arch/riscv32/mod.rs"]
+mod arch;
+
+#[no_mangle]
+#[cfg(target_arch = "riscv")]
+pub extern fn rust_main() -> ! {
+    loop {}
+}
+
 /// The entry point of Rust kernel
 #[no_mangle]
 #[cfg(target_arch = "x86_64")]