init: repo

.idea/.gitignore

@@ -0,0 +1,5 @@
+# 默认忽略的文件
+/shelf/
+/workspace.xml
+# 基于编辑器的 HTTP 客户端请求
+/httpRequests/

.idea/modules.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/rCore.iml" filepath="$PROJECT_DIR$/.idea/rCore.iml" />
+    </modules>
+  </component>
+</project>

.idea/rCore.iml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="EMPTY_MODULE" version="4">
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/os/src" isTestSource="false" />
+      <excludeFolder url="file://$MODULE_DIR$/os/target" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

os/.cargo/config.toml

@@ -0,0 +1,8 @@
+[build]
+target = "riscv64gc-unknown-none-elf"
+
+[target.riscv64gc-unknown-none-elf]
+rustflags = [
+    "-Clink-arg=-Tsrc/linker.ld",
+    "-Cforce-frame-pointers=yes"
+]

os/.gitignore

@@ -0,0 +1 @@
+/target

os/Cargo.lock

@@ -0,0 +1,34 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "os"
+version = "0.1.0"
+dependencies = [
+ "sbi-rt",
+]
+
+[[package]]
+name = "sbi-rt"
+version = "0.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8c113c53291db8ac141e01f43224ed488b8d6001ab66737b82e04695a43a42b7"
+dependencies = [
+ "sbi-spec",
+]
+
+[[package]]
+name = "sbi-spec"
+version = "0.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6d4027cf9bb591a9fd0fc0e283be6165c5abe96cb73e9f0e24738c227f425377"
+dependencies = [
+ "static_assertions",
+]
+
+[[package]]
+name = "static_assertions"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"

os/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "os"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+sbi-rt = { version = "0.0.2", features = ["legacy"] }

os/run.sh

@@ -0,0 +1,7 @@
+cargo build --release
+
+qemu-system-riscv64 \
+    -machine virt \
+    -nographic \
+    -bios ../bootloader/rustsbi-qemu.bin \
+    -device loader,file=target/riscv64gc-unknown-none-elf/release/os

os/src/console.rs

@@ -0,0 +1,33 @@
+use core::fmt;
+use core::fmt::Write;
+use crate::sbi::console_print;
+
+struct Stdout;
+
+impl Write for Stdout {
+    fn write_str(&mut self, s: &str) -> fmt::Result {
+        for c in s.chars() {
+            console_print(c as usize);
+        }
+
+        Ok(())
+    }
+}
+
+pub fn print(args: fmt::Arguments) {
+    Stdout.write_fmt(args).unwrap()
+}
+
+#[macro_export]
+macro_rules! print {
+    ($fmt: literal $(, $($arg: tt)+)?) => {
+        $crate::console::print(format_args!($fmt $(, $($arg)+)?));
+    }
+}
+
+#[macro_export]
+macro_rules! println {
+    ($fmt: literal $(, $($arg: tt)+)?) => {
+        $crate::console::print(format_args!(concat!($fmt, "\n") $(, $($arg)+)?));
+    }
+}

os/src/entry.asm

@@ -0,0 +1,12 @@
+    .section .text.entry
+    .global _start
+  _start:
+    la sp, boot_stack_top
+    call rust_main
+
+    .section .bss.stack
+    .global boot_stack_lower_bound
+  boot_stack_lower_bound:
+    .space 4096 * 16
+    .global boot_stack_top
+  boot_stack_top:

os/src/linker.ld

@@ -0,0 +1,48 @@
+OUTPUT_ARCH(riscv)
+ENTRY(_start)
+BASE_ADDRESS = 0x80200000;
+
+SECTIONS
+{
+    . = BASE_ADDRESS;
+    skernel = .;
+
+    stext = .;
+    .text : {
+        *(.text.entry)
+        *(.text .text.*)
+    }
+
+    . = ALIGN(4K);
+    etext = .;
+    srodata = .;
+    .rodata : {
+        *(.rodata .rodata.*)
+        *(.srodata .srodata.*)
+    }
+
+    . = ALIGN(4K);
+    erodata = .;
+    sdata = .;
+    .data : {
+        *(.data .data.*)
+        *(.sdata .sdata.*)
+    }
+
+    . = ALIGN(4K);
+    edata = .;
+    .bss : {
+        *(.bss.stack)
+        sbss = .;
+        *(.bss .bss.*)
+        *(.sbss .sbss.*)
+    }
+
+    . = ALIGN(4K);
+    ebss = .;
+    ekernel = .;
+
+    /DISCARD/ : {
+        *(.eh_frame)
+    }
+}

os/src/main.rs

@@ -0,0 +1,19 @@
+#![no_std]
+#![no_main]
+
+use core::arch::global_asm;
+use crate::utils::clear_bss;
+
+mod utils;
+mod sbi;
+mod console;
+
+global_asm!(include_str!("entry.asm"));
+
+#[no_mangle]
+fn rust_main() -> ! {
+    clear_bss();
+    println!("Hello, rCore!");
+    sbi::shutdown(false);
+}
+

os/src/sbi.rs

@@ -0,0 +1,16 @@
+pub fn console_print(c: usize) {
+    #[allow(deprecated)]
+    sbi_rt::legacy::console_putchar(c);
+}
+
+pub fn shutdown(failure: bool) -> ! {
+    use sbi_rt::{system_reset, Shutdown, NoReason, SystemFailure};
+
+    if failure {
+        system_reset(Shutdown, SystemFailure);
+    } else {
+        system_reset(Shutdown, NoReason);
+    }
+
+    unreachable!()
+}

os/src/utils.rs

@@ -0,0 +1,31 @@
+use core::panic::PanicInfo;
+use crate::println;
+use crate::sbi::shutdown;
+
+#[panic_handler]
+fn panic(info: &PanicInfo) -> ! {
+    if let Some(location) = info.location() {
+        println!("Panicked at {}:{} {}.",
+            location.file(),
+            location.line(),
+            info.message()
+        );
+    } else {
+        println!("Panicked: {}.", info.message());
+    }
+
+    shutdown(true)
+}
+
+pub fn clear_bss() {
+    extern "C" {
+        fn sbss();
+        fn ebss();
+    }
+
+    for m in sbss as usize..ebss as usize {
+        unsafe {
+            (m as *mut u8).write_volatile(0)
+        }
+    }
+}