buildtools: feat #135: Check the version of QEMU ahead

User should call sys_framebuffer_flush only once after the modification
on the framebuffer has been completed.
This commit also renames some gui apps.

.dockerignore

@@ -1 +1,2 @@
-*/*
+*/*
+!rust-toolchain.toml

Dockerfile

@@ -1,88 +1,72 @@
 # syntax=docker/dockerfile:1
-# This Dockerfile is adapted from https://github.com/LearningOS/rCore-Tutorial-v3/blob/main/Dockerfile
+
-# with the following major updates:
+# Stage 1 Build QEMU
-# - ubuntu 18.04 -> 20.04
+# - https://www.qemu.org/download/
-# - qemu 5.0.0 -> 7.0.0
+# - https://wiki.qemu.org/Hosts/Linux#Building_QEMU_for_Linux
-# - Extensive comments linking to relevant documentation
+# - https://wiki.qemu.org/Documentation/Platforms/RISCV
-FROM ubuntu:20.04
+
+FROM ubuntu:20.04 as build_qemu
 
 ARG QEMU_VERSION=7.0.0
-ARG GDB_VERSION=14.1
-ARG HOME=/root
 
-# 0. Install general tools
+RUN sed -i 's/archive.ubuntu.com/mirrors.tuna.tsinghua.edu.cn/g' /etc/apt/sources.list && \ 
-ARG DEBIAN_FRONTEND=noninteractive
+    sed -i 's/security.ubuntu.com/mirrors.tuna.tsinghua.edu.cn/g' /etc/apt/sources.list && \ 
-RUN apt-get update && \
+    apt-get update && \
-    apt-get install -y \
+    DEBIAN_FRONTEND=noninteractive apt-get install -y wget build-essential libglib2.0-dev libfdt-dev libpixman-1-dev zlib1g-dev ninja-build
-    curl \
-    git \
-    python3 \
-    wget
 
-# 1. Set up QEMU RISC-V
-# - https://learningos.github.io/rust-based-os-comp2022/0setup-devel-env.html#qemu
-# - https://www.qemu.org/download/
-# - https://wiki.qemu.org/Documentation/Platforms/RISCV
-# - https://risc-v-getting-started-guide.readthedocs.io/en/latest/linux-qemu.html
-
-# 1.1. Download source
-WORKDIR ${HOME}
 RUN wget https://download.qemu.org/qemu-${QEMU_VERSION}.tar.xz && \
-    tar xvJf qemu-${QEMU_VERSION}.tar.xz
+    tar xf qemu-${QEMU_VERSION}.tar.xz && \
-
+    cd qemu-${QEMU_VERSION} && \ 
-RUN wget https://ftp.gnu.org/gnu/gdb/gdb-${GDB_VERSION}.tar.xz && \
+    ./configure --target-list=riscv64-softmmu,riscv64-linux-user && \
-    tar xvJf gdb-${GDB_VERSION}.tar.xz
-
-# 1.2. Install dependencies
-# - https://risc-v-getting-started-guide.readthedocs.io/en/latest/linux-qemu.html#prerequisites
-RUN apt-get install -y \
-    autoconf automake autotools-dev curl libmpc-dev libmpfr-dev libgmp-dev \
-    gawk build-essential bison flex texinfo gperf libtool patchutils bc \
-    zlib1g-dev libexpat-dev git \
-    ninja-build pkg-config libglib2.0-dev libpixman-1-dev libsdl2-dev \
-    libncurses5-dev python2 python2-dev libreadline-dev tmux
-
-
-# 1.3. Build and install from source
-WORKDIR ${HOME}/qemu-${QEMU_VERSION}
-RUN ./configure --target-list=riscv64-softmmu,riscv64-linux-user && \
     make -j$(nproc) && \
     make install
 
-WORKDIR ${HOME}/gdb-${GDB_VERSION}
+# Stage 2 Set Lab Environment
-RUN ./configure --prefix=/usr/local --target=riscv64-unknown-elf --enable-tui=yes && \
+FROM ubuntu:20.04 as build
-    make -j$(nproc) && \
-    make install
 
-# 1.4. Clean up
+WORKDIR /tmp
-WORKDIR ${HOME}
-RUN rm -rf qemu-${QEMU_VERSION} qemu-${QEMU_VERSION}.tar.xz ${HOME}/gdb-${GDB_VERSION} gdb-${GDB_VERSION}.tar.xz
 
-# 1.5. Sanity checking
+# 2.0. Install general tools
-RUN qemu-system-riscv64 --version && \
+RUN sed -i 's/archive.ubuntu.com/mirrors.tuna.tsinghua.edu.cn/g' /etc/apt/sources.list && \ 
-    qemu-riscv64 --version
+    apt-get update && \
+    DEBIAN_FRONTEND=noninteractive apt-get install -y jq curl git python3 wget build-essential \
+    # qemu dependency
+    libglib2.0-0 libfdt1 libpixman-1-0 zlib1g \
+    # gdb
+    gdb-multiarch
 
-# 2. Set up Rust
+# 2.1. Copy qemu
-# - https://learningos.github.io/rust-based-os-comp2022/0setup-devel-env.html#qemu
+COPY --from=build_qemu /usr/local/bin/* /usr/local/bin
+
+# 2.2. Install Rust
 # - https://www.rust-lang.org/tools/install
-# - https://github.com/rust-lang/docker-rust/blob/master/Dockerfile-debian.template
-
-# 2.1. Install
 ENV RUSTUP_HOME=/usr/local/rustup \
     CARGO_HOME=/usr/local/cargo \
     PATH=/usr/local/cargo/bin:$PATH \
-    RUST_VERSION=nightly
+    RUSTUP_DIST_SERVER=https://mirrors.ustc.edu.cn/rust-static \
-RUN set -eux; \
+    RUSTUP_UPDATE_ROOT=https://mirrors.ustc.edu.cn/rust-static/rustup 
-    curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs -o rustup-init; \
+RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | \
-    chmod +x rustup-init; \
+    sh -s -- -y --no-modify-path --profile minimal --default-toolchain nightly
-    ./rustup-init -y --no-modify-path --profile minimal --default-toolchain $RUST_VERSION; \
-    rm rustup-init; \
-    chmod -R a+w $RUSTUP_HOME $CARGO_HOME;
 
-# 2.2. Sanity checking
+# 2.3. Build env for labs
-RUN rustup --version && \
+# See os/Makefile `env:` for example.
+# This avoids having to wait for these steps each time using a new container.
+COPY rust-toolchain.toml rust-toolchain.toml
+RUN rustup target add riscv64gc-unknown-none-elf && \
+    cargo install toml-cli cargo-binutils && \
+    RUST_VERSION=$(toml get -r rust-toolchain.toml toolchain.channel) && \
+    Components=$(toml get -r rust-toolchain.toml toolchain.components | jq -r 'join(" ")') && \
+    rustup install $RUST_VERSION && \
+    rustup component add --toolchain $RUST_VERSION $Components
+
+# 2.4. Set GDB
+RUN ln -s /usr/bin/gdb-multiarch /usr/bin/riscv64-unknown-elf-gdb
+
+# Stage 3 Sanity checking
+FROM build as test
+RUN qemu-system-riscv64 --version && \
+    qemu-riscv64 --version && \
+    rustup --version && \
     cargo --version && \
-    rustc --version
+    rustc --version && \
-
+    riscv64-unknown-elf-gdb --version
-# Ready to go
-WORKDIR ${HOME}

Makefile

@@ -1,11 +1,11 @@
-DOCKER_NAME ?= rcore-tutorial-v3
+DOCKER_TAG ?= rcore-tutorial-v3:latest
 .PHONY: docker build_docker
 	
 docker:
-	docker run --rm -it -v ${PWD}:/mnt -w /mnt ${DOCKER_NAME} bash
+	docker run --rm -it -v ${PWD}:/mnt -w /mnt --name rcore-tutorial-v3 ${DOCKER_TAG} bash
 
 build_docker: 
-	docker build -t ${DOCKER_NAME} .
+	docker build -t ${DOCKER_TAG} --target build .
 
 fmt:
 	cd easy-fs; cargo fmt; cd ../easy-fs-fuse cargo fmt; cd ../os ; cargo fmt; cd ../user; cargo fmt; cd ..

os/Makefile

@@ -90,20 +90,23 @@ fdt:
 	@qemu-system-riscv64 -M 128m -machine virt,dumpdtb=virt.out
 	fdtdump virt.out
 
-run-inner: build
+QEMU_NAME := qemu-system-riscv64
+qemu-version-check:
+	@sh scripts/qemu-ver-check.sh $(QEMU_NAME)
+
+run-inner: qemu-version-check build
 	@qemu-system-riscv64 $(QEMU_ARGS)
 
-debug: build
+debug: qemu-version-check build
 	@tmux new-session -d \
 		"qemu-system-riscv64 $(QEMU_ARGS) -s -S" && \
 		tmux split-window -h "riscv64-unknown-elf-gdb -ex 'file $(KERNEL_ELF)' -ex 'set arch riscv:rv64' -ex 'target remote localhost:1234'" && \
 		tmux -2 attach-session -d
 
-
+gdbserver: qemu-version-check build
-gdbserver: build
 	@qemu-system-riscv64 $(QEMU_ARGS) -s -S
 
 gdbclient:
 	@riscv64-unknown-elf-gdb -ex 'file $(KERNEL_ELF)' -ex 'set arch riscv:rv64' -ex 'target remote localhost:1234'
 
-.PHONY: build env kernel clean disasm disasm-vim run-inner fs-img gdbserver gdbclient fdt
+.PHONY: build env kernel clean disasm disasm-vim run-inner fs-img gdbserver gdbclient fdt qemu-version-check

os/scripts/qemu-ver-check.sh

@@ -0,0 +1,26 @@
+#!/bin/sh
+
+# Argument1: The filename of qemu executable, e.g. qemu-system-riscv64
+QEMU_PATH=$(which $1)
+RET=$?
+MINIMUM_MAJOR_VERSION=7
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+NC='\033[0m'
+if [ $RET != 0 ]
+then
+    echo "$1 not found"
+    exit 1
+else
+    QEMU_VERSION=$($1 --version|head -n 1|awk '{print $4}')
+    MAJOR_VERSION=$(echo $QEMU_VERSION|cut -c1-1)
+    if [ $MAJOR_VERSION -lt $MINIMUM_MAJOR_VERSION ]
+    then
+        echo "${RED}Error: Required major version of QEMU is ${MINIMUM_MAJOR_VERSION}, " \
+             "but current is ${QEMU_VERSION}.${NC}"
+        exit 1
+    else
+        echo "${GREEN}QEMU version is ${QEMU_VERSION}(>=${MINIMUM_MAJOR_VERSION}), OK!${NC}"
+        exit 0
+    fi
+fi

os/src/mm/memory_set.rs

@@ -77,7 +77,7 @@ impl MemorySet {
     pub fn push(&mut self, mut map_area: MapArea, data: Option<&[u8]>) {
         map_area.map(&mut self.page_table);
         if let Some(data) = data {
-            map_area.copy_data(&mut self.page_table, data);
+            map_area.copy_data(&self.page_table, data);
         }
         self.areas.push(map_area);
     }
@@ -316,7 +316,7 @@ impl MapArea {
     }
     /// data: start-aligned but maybe with shorter length
     /// assume that all frames were cleared before
-    pub fn copy_data(&mut self, page_table: &mut PageTable, data: &[u8]) {
+    pub fn copy_data(&mut self, page_table: &PageTable, data: &[u8]) {
         assert_eq!(self.map_type, MapType::Framed);
         let mut start: usize = 0;
         let mut current_vpn = self.vpn_range.get_start();

os/src/task/mod.rs

@@ -127,6 +127,13 @@ pub fn exit_current_and_run_next(exit_code: i32) {
         process_inner.memory_set.recycle_data_pages();
         // drop file descriptors
         process_inner.fd_table.clear();
+        // Remove all tasks except for the main thread itself.
+        // This is because we are still using the kstack under the TCB
+        // of the main thread. This TCB, including its kstack, will be
+        // deallocated when the process is reaped via waitpid.
+        while process_inner.tasks.len() > 1 {
+            process_inner.tasks.pop();
+        }
     }
     drop(process);
     // we do not have to save task context

rust-toolchain.toml

@@ -1,6 +1,6 @@
 [toolchain]
 profile = "minimal"
 # use the nightly version of the last stable toolchain, see <https://forge.rust-lang.org/>
-channel = "nightly-2024-01-18"
+channel = "nightly-2024-05-01"
-components = ["rust-src", "llvm-tools-preview", "rustfmt", "clippy"]
+components = ["rust-src", "llvm-tools", "rustfmt", "clippy"]
 targets = ["riscv64gc-unknown-none-elf"]

user/src/bin/adder_peterson_spin.rs

@@ -8,7 +8,7 @@ extern crate user_lib;
 extern crate alloc;
 
 use alloc::vec::Vec;
-use core::ptr::{addr_of, addr_of_mut, read_volatile};
+use core::ptr::addr_of_mut;
 use core::sync::atomic::{compiler_fence, Ordering};
 use user_lib::{exit, get_time, thread_create, waittid};
 
@@ -39,7 +39,7 @@ unsafe fn lock(id: usize) {
     // Otherwise the compiler will assume that they will never
     // be changed on this thread. Thus, they will be accessed
     // only once!
-    while read_volatile(addr_of!(FLAG[j])) && read_volatile(addr_of!(TURN)) == j {}
+    while vload!(FLAG[j]) && vload!(TURN) == j {}
 }
 
 unsafe fn unlock(id: usize) {

user/src/bin/adder_simple_spin.rs

@@ -6,7 +6,7 @@ extern crate user_lib;
 extern crate alloc;
 
 use alloc::vec::Vec;
-use core::ptr::{addr_of, addr_of_mut, read_volatile};
+use core::ptr::addr_of_mut;
 use user_lib::{exit, get_time, thread_create, waittid};
 
 static mut A: usize = 0;
@@ -25,7 +25,7 @@ unsafe fn critical_section(t: &mut usize) {
 }
 
 unsafe fn lock() {
-    while read_volatile(addr_of!(OCCUPIED)) {}
+    while vload!(OCCUPIED) {}
     OCCUPIED = true;
 }
 

user/src/bin/eisenberg.rs

@@ -8,7 +8,6 @@ extern crate core;
 
 use alloc::vec::Vec;
 use core::{
-    ptr::{addr_of, addr_of_mut, read_volatile, write_volatile},
     sync::atomic::{AtomicUsize, Ordering},
 };
 use user_lib::{exit, sleep, thread_create, waittid};
@@ -44,15 +43,15 @@ unsafe fn eisenberg_enter_critical(id: usize) {
     /* announce that we want to enter */
     loop {
         println!("Thread[{}] try enter", id);
-        write_volatile(addr_of_mut!(FLAG[id]), FlagState::Want);
+        vstore!(FLAG[id], FlagState::Want);
         loop {
             /* check if any with higher priority is `Want` or `In` */
             let mut prior_thread: Option<usize> = None;
-            let turn = read_volatile(addr_of!(TURN));
+            let turn = vload!(TURN);
             let ring_id = if id < turn { id + THREAD_NUM } else { id };
             // FLAG.iter() may lead to some errors, use for-loop instead
             for i in turn..ring_id {
-                if read_volatile(addr_of!(FLAG[i % THREAD_NUM])) != FlagState::Out {
+                if vload!(FLAG[i % THREAD_NUM]) != FlagState::Out {
                     prior_thread = Some(i % THREAD_NUM);
                     break;
                 }
@@ -68,13 +67,13 @@ unsafe fn eisenberg_enter_critical(id: usize) {
             sleep(1);
         }
         /* now tentatively claim the resource */
-        write_volatile(addr_of_mut!(FLAG[id]), FlagState::In);
+        vstore!(FLAG[id], FlagState::In);
         /* enforce the order of `claim` and `conflict check`*/
         memory_fence!();
         /* check if anthor thread is also `In`, which imply a conflict*/
         let mut conflict = false;
         for i in 0..THREAD_NUM {
-            if i != id && read_volatile(addr_of!(FLAG[i])) == FlagState::In {
+            if i != id && vload!(FLAG[i]) == FlagState::In {
                 conflict = true;
             }
         }
@@ -85,7 +84,7 @@ unsafe fn eisenberg_enter_critical(id: usize) {
         /* no need to sleep */
     }
     /* clain the trun */
-    write_volatile(addr_of_mut!(TURN), id);
+    vstore!(TURN, id);
     println!("Thread[{}] enter", id);
 }
 
@@ -95,14 +94,14 @@ unsafe fn eisenberg_exit_critical(id: usize) {
     let ring_id = id + THREAD_NUM;
     for i in (id + 1)..ring_id {
         let idx = i % THREAD_NUM;
-        if read_volatile(addr_of!(FLAG[idx])) == FlagState::Want {
+        if vload!(FLAG[idx]) == FlagState::Want {
             next = idx;
             break;
         }
     }
-    write_volatile(addr_of_mut!(TURN), next);
+    vstore!(TURN, next);
     /* All done */
-    write_volatile(addr_of_mut!(FLAG[id]), FlagState::Out);
+    vstore!(FLAG[id], FlagState::Out);
     println!("Thread[{}] exit, give turn to {}", id, next);
 }
 

user/src/bin/gui_move.rs

@@ -0,0 +1,82 @@
+#![no_std]
+#![no_main]
+
+extern crate user_lib;
+extern crate alloc;
+
+use user_lib::console::getchar;
+use user_lib::{Display, VIRTGPU_XRES, VIRTGPU_YRES};
+
+use embedded_graphics::pixelcolor::Rgb888;
+use embedded_graphics::prelude::{Drawable, Point, RgbColor, Size};
+use embedded_graphics::primitives::Primitive;
+use embedded_graphics::primitives::{PrimitiveStyle, Rectangle};
+use embedded_graphics::draw_target::DrawTarget;
+
+const INIT_X: i32 = 640;
+const INIT_Y: i32 = 400;
+const RECT_SIZE: u32 = 40;
+
+pub struct DrawingBoard {
+    disp: Display,
+    latest_pos: Point,
+}
+
+impl DrawingBoard {
+    pub fn new() -> Self {
+        Self {
+            disp: Display::new(Size::new(VIRTGPU_XRES, VIRTGPU_YRES)),
+            latest_pos: Point::new(INIT_X, INIT_Y),
+        }
+    }
+    fn paint(&mut self) {
+        Rectangle::with_center(self.latest_pos, Size::new(RECT_SIZE, RECT_SIZE))
+            .into_styled(PrimitiveStyle::with_stroke(Rgb888::WHITE, 1))
+            .draw(&mut self.disp)
+            .ok();
+    }
+    fn unpaint(&mut self) {
+        Rectangle::with_center(self.latest_pos, Size::new(RECT_SIZE, RECT_SIZE))
+            .into_styled(PrimitiveStyle::with_stroke(Rgb888::BLACK, 1))
+            .draw(&mut self.disp)
+            .ok();
+    }
+    pub fn move_rect(&mut self, dx: i32, dy: i32) {
+        let new_x = self.latest_pos.x + dx;
+        let new_y = self.latest_pos.y + dy;
+        let r = (RECT_SIZE / 2) as i32;
+        if new_x > r && new_x + r < (VIRTGPU_XRES as i32) && new_y > r && new_y + r < (VIRTGPU_YRES as i32) {
+            self.unpaint();
+            self.latest_pos.x = new_x;
+            self.latest_pos.y = new_y;
+            self.paint();
+        }
+    }
+}
+
+const LF: u8 = 0x0au8;
+const CR: u8 = 0x0du8;
+#[no_mangle]
+pub fn main() -> i32 {
+    let mut board = DrawingBoard::new();
+    let _ = board.disp.clear(Rgb888::BLACK).unwrap();
+    board.disp.flush();
+    loop {
+        let c = getchar();
+        if c == LF || c == CR {
+            break;
+        }
+        let mut moved = true;
+        match c {
+            b'w' => board.move_rect(0, -10),
+            b'a' => board.move_rect(-10, 0),
+            b's' => board.move_rect(0, 10),
+            b'd' => board.move_rect(10, 0),
+            _ => moved = false,
+        }
+        if moved {
+            board.disp.flush();
+        }
+    }
+    0
+}

user/src/bin/gui_shape.rs

@@ -44,18 +44,6 @@ impl DrawingBoard {
         .draw(&mut self.disp)
         .ok();
     }
-    fn unpaint(&mut self) {
-        Rectangle::with_center(self.latest_pos, Size::new(RECT_SIZE, RECT_SIZE))
-            .into_styled(PrimitiveStyle::with_stroke(Rgb888::BLACK, 10))
-            .draw(&mut self.disp)
-            .ok();
-    }
-    pub fn move_rect(&mut self, dx: i32, dy: i32) {
-        self.unpaint();
-        self.latest_pos.x += dx;
-        self.latest_pos.y += dy;
-        self.paint();
-    }
 }
 
 #[no_mangle]
@@ -64,8 +52,8 @@ pub fn main() -> i32 {
     let _ = board.disp.clear(Rgb888::BLACK).unwrap();
     for _ in 0..5 {
         board.latest_pos.x += RECT_SIZE as i32 + 20;
-        //board.latest_pos.y += i;
         board.paint();
     }
+    board.disp.flush();
     0
 }

user/src/bin/gui_snake.rs

@@ -328,7 +328,7 @@ const CR: u8 = 0x0du8;
 #[no_mangle]
 pub fn main() -> i32 {
     let mut disp = Display::new(Size::new(VIRTGPU_XRES, VIRTGPU_YRES));
-    let mut game = SnakeGame::<20, Rgb888>::new(1280, 800, 20, 20, Rgb888::RED, Rgb888::YELLOW, 50);
+    let mut game = SnakeGame::<20, Rgb888>::new(1280, 800, 20, 20, Rgb888::RED, Rgb888::YELLOW, 200);
     let _ = disp.clear(Rgb888::BLACK).unwrap();
     loop {
         if key_pressed() {
@@ -345,7 +345,8 @@ pub fn main() -> i32 {
         }
         let _ = disp.clear(Rgb888::BLACK).unwrap();
         game.draw(&mut disp);
-        sleep(10);
+        disp.flush();
+        sleep(40);
     }
     0
 }

user/src/bin/gui_tri.rs

@@ -19,5 +19,6 @@ pub fn main() -> i32 {
             }
         }
     });
+    disp.flush();
     0
 }

user/src/bin/gui_uart.rs

@@ -1,125 +0,0 @@
-#![no_std]
-#![no_main]
-
-#[macro_use]
-extern crate user_lib;
-extern crate alloc;
-
-use user_lib::console::getchar;
-use user_lib::{framebuffer, framebuffer_flush};
-
-use embedded_graphics::pixelcolor::Rgb888;
-use embedded_graphics::prelude::{Drawable, Point, RgbColor, Size};
-use embedded_graphics::primitives::Primitive;
-use embedded_graphics::primitives::{PrimitiveStyle, Rectangle};
-use embedded_graphics::{draw_target::DrawTarget, prelude::OriginDimensions};
-
-pub const VIRTGPU_XRES: usize = 1280;
-pub const VIRTGPU_YRES: usize = 800;
-pub const VIRTGPU_LEN: usize = VIRTGPU_XRES * VIRTGPU_YRES * 4;
-
-const INIT_X: i32 = 640;
-const INIT_Y: i32 = 400;
-const RECT_SIZE: u32 = 40;
-
-pub struct Display {
-    pub size: Size,
-    pub point: Point,
-    //pub fb: Arc<&'static mut [u8]>,
-    pub fb: &'static mut [u8],
-}
-
-impl Display {
-    pub fn new(size: Size, point: Point) -> Self {
-        let fb_ptr = framebuffer() as *mut u8;
-        println!(
-            "Hello world from user mode program! 0x{:X} , len {}",
-            fb_ptr as usize, VIRTGPU_LEN
-        );
-        let fb =
-            unsafe { core::slice::from_raw_parts_mut(fb_ptr as *mut u8, VIRTGPU_LEN as usize) };
-        Self { size, point, fb }
-    }
-}
-
-impl OriginDimensions for Display {
-    fn size(&self) -> Size {
-        self.size
-    }
-}
-
-impl DrawTarget for Display {
-    type Color = Rgb888;
-
-    type Error = core::convert::Infallible;
-
-    fn draw_iter<I>(&mut self, pixels: I) -> Result<(), Self::Error>
-    where
-        I: IntoIterator<Item = embedded_graphics::Pixel<Self::Color>>,
-    {
-        pixels.into_iter().for_each(|px| {
-            let idx = ((self.point.y + px.0.y) * VIRTGPU_XRES as i32 + self.point.x + px.0.x)
-                as usize
-                * 4;
-            if idx + 2 >= self.fb.len() {
-                return;
-            }
-            self.fb[idx] = px.1.b();
-            self.fb[idx + 1] = px.1.g();
-            self.fb[idx + 2] = px.1.r();
-        });
-        framebuffer_flush();
-        Ok(())
-    }
-}
-
-pub struct DrawingBoard {
-    disp: Display,
-    latest_pos: Point,
-}
-
-impl DrawingBoard {
-    pub fn new() -> Self {
-        Self {
-            disp: Display::new(Size::new(1280, 800), Point::new(0, 0)),
-            latest_pos: Point::new(INIT_X, INIT_Y),
-        }
-    }
-    fn paint(&mut self) {
-        Rectangle::with_center(self.latest_pos, Size::new(RECT_SIZE, RECT_SIZE))
-            .into_styled(PrimitiveStyle::with_stroke(Rgb888::WHITE, 1))
-            .draw(&mut self.disp)
-            .ok();
-    }
-    fn unpaint(&mut self) {
-        Rectangle::with_center(self.latest_pos, Size::new(RECT_SIZE, RECT_SIZE))
-            .into_styled(PrimitiveStyle::with_stroke(Rgb888::BLACK, 1))
-            .draw(&mut self.disp)
-            .ok();
-    }
-    pub fn move_rect(&mut self, dx: i32, dy: i32) {
-        self.unpaint();
-        self.latest_pos.x += dx;
-        self.latest_pos.y += dy;
-        self.paint();
-    }
-}
-
-const LF: u8 = 0x0au8;
-const CR: u8 = 0x0du8;
-#[no_mangle]
-pub fn main() -> i32 {
-    // let fb_ptr = framebuffer() as *mut u8;
-    let mut board = DrawingBoard::new();
-    let _ = board.disp.clear(Rgb888::BLACK).unwrap();
-    for i in 0..20 {
-        let c = getchar();
-        if c == LF || c == CR {
-            break;
-        }
-        board.latest_pos.x += i;
-        board.latest_pos.y += i;
-        board.paint();
-    }
-    0
-}

user/src/bin/peterson.rs

@@ -7,7 +7,6 @@ extern crate alloc;
 extern crate core;
 
 use alloc::vec::Vec;
-use core::ptr::{addr_of, addr_of_mut, read_volatile, write_volatile};
 use core::sync::atomic::{AtomicUsize, Ordering};
 use user_lib::{exit, sleep, thread_create, waittid};
 const N: usize = 1000;
@@ -30,10 +29,10 @@ fn critical_test_exit() {
 
 unsafe fn peterson_enter_critical(id: usize, peer_id: usize) {
     // println!("Thread[{}] try enter", id);
-    write_volatile(addr_of_mut!(FLAG[id]), true);
+    vstore!(FLAG[id], true);
-    write_volatile(addr_of_mut!(TURN), peer_id);
+    vstore!(TURN, peer_id);
     memory_fence!();
-    while read_volatile(addr_of!(FLAG[peer_id])) && read_volatile(addr_of!(TURN)) == peer_id {
+    while vload!(FLAG[peer_id]) && vload!(TURN) == peer_id {
         // println!("Thread[{}] enter fail", id);
         sleep(1);
         // println!("Thread[{}] retry enter", id);
@@ -42,7 +41,7 @@ unsafe fn peterson_enter_critical(id: usize, peer_id: usize) {
 }
 
 unsafe fn peterson_exit_critical(id: usize) {
-    write_volatile(addr_of_mut!(FLAG[id]), false);
+    vstore!(FLAG[id], false);
     // println!("Thread[{}] exit", id);
 }
 

user/src/io.rs

@@ -32,6 +32,8 @@ impl Display {
     }
     pub fn paint_on_framebuffer(&mut self, p: impl FnOnce(&mut [u8]) -> ()) {
         p(self.framebuffer());
+    }
+    pub fn flush(&self) {
         framebuffer_flush();
     }
 }
@@ -60,7 +62,6 @@ impl DrawTarget for Display {
             self.fb[idx + 1] = px.1.g();
             self.fb[idx + 2] = px.1.r();
         });
-        framebuffer_flush();
         Ok(())
     }
 }

user/src/lib.rs

@@ -70,15 +70,17 @@ fn main(_argc: usize, _argv: &[&str]) -> i32 {
 
 #[macro_export]
 macro_rules! vstore {
-    ($var_ref: expr, $value: expr) => {
+    ($var: expr, $value: expr) => {
-        unsafe { core::intrinsics::volatile_store($var_ref as *const _ as _, $value) }
+        // unsafe { core::intrinsics::volatile_store($var_ref as *const _ as _, $value) }
+        unsafe { core::ptr::write_volatile(core::ptr::addr_of_mut!($var), $value); }
     };
 }
 
 #[macro_export]
 macro_rules! vload {
-    ($var_ref: expr) => {
+    ($var: expr) => {
-        unsafe { core::intrinsics::volatile_load($var_ref as *const _ as _) }
+        // unsafe { core::intrinsics::volatile_load($var_ref as *const _ as _) }
+        unsafe { core::ptr::read_volatile(core::ptr::addr_of!($var)) }
     };
 }