diff --git a/kernel/Cargo.lock b/kernel/Cargo.lock
index 6c6b307..99030d5 100644
--- a/kernel/Cargo.lock
+++ b/kernel/Cargo.lock
@@ -1,3 +1,5 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
 [[package]]
 name = "aarch64"
 version = "2.2.2"
diff --git a/kernel/Cargo.toml b/kernel/Cargo.toml
index 36ad8af..b6c5217 100644
--- a/kernel/Cargo.toml
+++ b/kernel/Cargo.toml
@@ -11,7 +11,9 @@ authors = [
     "koumingyang <1761674434@qq.com>",
     "lcy1996 <992195697@qq.com>",
     "chenqiuhao <haohao0924@126.com>",
-    "maoyuchaxue <wangjt15@mails.tsinghua.edu.cn>"
+    "maoyuchaxue <wangjt15@mails.tsinghua.edu.cn>",
+    "Jiajie Chen <jiegec@qq.com>",
+    "chyyuu <yuchen@mail.tsinghua.edu.cn>"
 ]
 
 [features]
diff --git a/kernel/Makefile b/kernel/Makefile
index fbe27b6..c011e0e 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -250,7 +250,10 @@ else ifeq ($(arch), riscv32)
 		src/arch/riscv32/atomic.patch
 	@cargo xbuild $(build_args)
 else ifeq ($(arch), riscv64)
-	@./build-rv64
+	@-patch -p0 -N -b \
+		$(shell rustc --print sysroot)/lib/rustlib/src/rust/src/libcore/sync/atomic.rs \
+		src/arch/riscv32/atomic.patch
+	@cargo xbuild $(build_args)
 else ifeq ($(arch), aarch64)
 	@cargo xbuild $(build_args)
 endif
diff --git a/kernel/build-rv64 b/kernel/build-rv64
deleted file mode 100755
index b4d467f..0000000
--- a/kernel/build-rv64
+++ /dev/null
@@ -1,678 +0,0 @@
-#!/bin/bash
-# The contents are adopted from xbuild verbose output.
-# Output files are in target/${ARCH}/debug
-#
-# By default riscv64 is built. To build for riscv32,
-#		set the environment variable `RV32` to "1"
-set -e
-
-if [[ ${RV32} = 1 ]]; then
-	TARGET_ARCH=riscv32
-	CFLAGS="-march=rv32imac -mabi=ilp32"
-else
-	TARGET_ARCH=riscv64
-	CFLAGS="-march=rv64imac -mabi=lp64"
-fi
-UCORE_USER_IMAGE="../user/img/ucore-${TARGET_ARCH}.img"
-LLC=$PWD/../tools/llc
-RUST_SRC_PATH=$(rustc --print sysroot)/lib/rustlib/src/rust/src
-CARGO_PATH=~/.cargo
-LLC_ARCH=${TARGET_ARCH}
-OUTDIR=$PWD/target/${TARGET_ARCH}/debug
-TARGET_JSON=$PWD/targets/${TARGET_ARCH}.json
-CC=${TARGET_ARCH}-unknown-elf-gcc
-AR=${TARGET_ARCH}-unknown-elf-ar
-OBJCOPY=${TARGET_ARCH}-unknown-elf-objcopy
-QEMU=qemu-system-${TARGET_ARCH}
-export SMP=4
-
-#============================================================================
-# Check env before build
-
-mkdir -p ${OUTDIR}
-
-# auto download K210 SDK lib
-if [[ ${board} = k210 ]] && ! [[ -f ${OUTDIR}/libkendryte.a ]]
-then
-    wget https://github.com/wangrunji0408/RustOS/releases/download/v0.1/libkendryte.a
-    mv libkendryte.a ${OUTDIR}
-fi
-
-# auto download llc
-if ! [[ -f ${LLC} ]]
-then
-    cd ../tools
-if [[ $(uname) = Linux ]]; then
-    wget https://github.com/wangrunji0408/RustOS/releases/download/v0.1/llc-ubuntu
-    mv llc-ubuntu llc
-else
-    wget https://github.com/wangrunji0408/RustOS/releases/download/v0.1/llc-macOS
-    mv llc-macOS llc
-fi
-    chmod +x llc
-    cd ../kernel
-fi
-
-# if some crates are not exist, build for riscv32 first
-if ! [[ -f $CARGO_PATH/git/checkouts/bit-vec-437fa4a002bd318d/9861a58/src/lib.rs ]] || ! [[ -z ${TRAVIS_OS_NAME} ]]
-then
-    make kernel arch=riscv32 board=none
-fi
-
-#============================================================================
-# Stupid long implementation
-
-gen_full_rlib() {
-  PWD0=${PWD}
-  cd ${OUTDIR}
-  for X in ${CNAME}.*bc
-  do
-    ${LLC} -march=${LLC_ARCH} -filetype=obj -mattr=+m,+c ${X}
-  done
-  for X in ${CNAME}.*o
-  do
-    ${AR} r lib${CNAME}.rlib ${X}
-  done
-  cd ${PWD0}
-}
-
-#
-# Basic dependencies
-CNAME=core
-if ! [[ -f ${OUTDIR}/${CNAME}.o ]]
-then
-rustc --crate-name ${CNAME} $RUST_SRC_PATH/libcore/lib.rs \
-    --color always --crate-type lib --emit=metadata,llvm-bc \
-    -C opt-level=3 \
-    -C debuginfo=2 \
-    -Z force-unstable-if-unmarked \
-    --out-dir ${OUTDIR} \
-    --target $TARGET_JSON
-gen_full_rlib
-fi
-
-# Note: In recent nightly, compiler_builtins has been removed from rust_src.
-CNAME=compiler_builtins
-if ! [[ -f ${OUTDIR}/${CNAME}.o ]]
-then
-	if [[ -d $CARGO_PATH/registry/src/github.com-1ecc6299db9ec823/compiler_builtins-0.1.5 ]]
-	then
-		COMPILER_BUILTINS_PATH=$CARGO_PATH/registry/src/github.com-1ecc6299db9ec823/compiler_builtins-0.1.5
-	else
-		echo "Cannot find compiler_builtins crate! Please file an issue report"
-	fi
-
-	rustc --crate-name compiler_builtins ${COMPILER_BUILTINS_PATH}/src/lib.rs \
-			--color always --crate-type lib --emit=metadata,llvm-bc \
-			-C opt-level=3 \
-			-C debuginfo=2 \
-			-Z force-unstable-if-unmarked \
-			--cfg 'feature="compiler-builtins"' \
-			--cfg 'feature="mem"' \
-			--out-dir ${OUTDIR} \
-			--target $TARGET_JSON \
-			-L ${OUTDIR}
-	gen_full_rlib
-fi
-
-CNAME=alloc
-if ! [[ -f ${OUTDIR}/${CNAME}.o ]]
-then
-rustc --crate-name alloc $RUST_SRC_PATH/liballoc/lib.rs \
-    --color always --crate-type lib --emit=metadata,llvm-bc \
-    -C opt-level=3 \
-    -C debuginfo=2 \
-    -Z force-unstable-if-unmarked \
-    --out-dir ${OUTDIR} \
-    --target $TARGET_JSON \
-    -L ${OUTDIR}
-gen_full_rlib
-fi
-
-
-CNAME=semver_parser
-if ! [[ -f ${OUTDIR}/${CNAME}.o ]]
-then
-rustc --crate-name semver_parser $CARGO_PATH/registry/src/github.com-1ecc6299db9ec823/semver-parser-0.7.0/src/lib.rs \
-    --color always --crate-type lib --emit=metadata,llvm-bc \
-    -C opt-level=1 \
-    -C debuginfo=2 \
-    -C debug-assertions=on \
-    --out-dir ${OUTDIR} \
-    -L ${OUTDIR} \
-    --cap-lints allow
-gen_full_rlib
-fi
-
-CNAME=cfg_if
-if ! [[ -f ${OUTDIR}/${CNAME}.o ]]
-then
-rustc --crate-name cfg_if $CARGO_PATH/registry/src/github.com-1ecc6299db9ec823/cfg-if-0.1.6/src/lib.rs \
-    --color always --crate-type lib --emit=metadata,llvm-bc \
-    -C opt-level=1 \
-    -C debuginfo=2 \
-    -C debug-assertions=on \
-    --out-dir ${OUTDIR} \
-    --target $TARGET_JSON \
-    -L ${OUTDIR} \
-    --cap-lints allow
-gen_full_rlib
-fi
-
-CNAME=spin
-if ! [[ -f ${OUTDIR}/${CNAME}.o ]]
-then
-rustc --crate-name spin $CARGO_PATH/registry/src/github.com-1ecc6299db9ec823/spin-0.4.10/src/lib.rs \
-    --color always --crate-type lib --emit=metadata,llvm-bc \
-    -C opt-level=1 \
-    -C debuginfo=2 \
-    -C debug-assertions=on \
-    --cfg 'feature="const_fn"' \
-    --cfg 'feature="default"' \
-    --cfg 'feature="once"' \
-    --cfg 'feature="unstable"' \
-    --out-dir ${OUTDIR} \
-    --target $TARGET_JSON \
-    -L ${OUTDIR} \
-    --cap-lints allow
-gen_full_rlib
-fi
-
-CNAME=static_assertions
-if ! [[ -f ${OUTDIR}/${CNAME}.o ]]
-then
-rustc --crate-name static_assertions $CARGO_PATH/registry/src/github.com-1ecc6299db9ec823/static_assertions-0.3.1/src/lib.rs \
-    --color always --crate-type lib --emit=metadata,llvm-bc \
-    -C opt-level=1 \
-    -C debuginfo=2 \
-    -C debug-assertions=on \
-    --out-dir ${OUTDIR} \
-    --target $TARGET_JSON \
-    -L ${OUTDIR} \
-    --cap-lints allow
-gen_full_rlib
-fi
-
-CNAME=bit_field
-if ! [[ -f ${OUTDIR}/${CNAME}.o ]]
-then
-rustc --crate-name bit_field $CARGO_PATH/registry/src/github.com-1ecc6299db9ec823/bit_field-0.9.0/src/lib.rs \
-    --color always --crate-type lib --emit=metadata,llvm-bc \
-    -C opt-level=1 \
-    -C debuginfo=2 \
-    -C debug-assertions=on \
-    --out-dir ${OUTDIR} \
-    --target $TARGET_JSON \
-    -L ${OUTDIR} \
-    --cap-lints allow
-gen_full_rlib
-fi
-
-CNAME=zero
-if ! [[ -f ${OUTDIR}/${CNAME}.o ]]
-then
-rustc --crate-name zero $CARGO_PATH/registry/src/github.com-1ecc6299db9ec823/zero-0.1.2/src/lib.rs \
-    --color always --crate-type lib --emit=metadata,llvm-bc \
-    -C opt-level=1 \
-    -C debuginfo=2 \
-    -C debug-assertions=on \
-    --out-dir ${OUTDIR} \
-    --target $TARGET_JSON \
-    -L ${OUTDIR} \
-    --cap-lints allow
-gen_full_rlib
-fi
-
-CNAME=bit_vec
-if ! [[ -f ${OUTDIR}/${CNAME}.o ]]
-then
-rustc --crate-name bit_vec $CARGO_PATH/git/checkouts/bit-vec-437fa4a002bd318d/9861a58*/src/lib.rs \
-    --color always --crate-type lib --emit=metadata,llvm-bc \
-    -C opt-level=1 \
-    -C debuginfo=2 \
-    -C debug-assertions=on \
-    --out-dir ${OUTDIR} \
-    --target $TARGET_JSON \
-    -L ${OUTDIR} \
-    --cap-lints allow
-gen_full_rlib
-fi
-
-CNAME=bitflags
-if ! [[ -f ${OUTDIR}/${CNAME}.o ]]
-then
-rustc --crate-name bitflags $CARGO_PATH/registry/src/github.com-1ecc6299db9ec823/bitflags-1.0.4/src/lib.rs \
-    --color always --crate-type lib --emit=metadata,llvm-bc \
-    -C opt-level=1 \
-    -C debuginfo=2 \
-    -C debug-assertions=on \
-    --cfg 'feature="default"' \
-    --out-dir ${OUTDIR} \
-    --target $TARGET_JSON \
-    -L ${OUTDIR} \
-    --cap-lints allow
-gen_full_rlib
-fi
-
-CNAME=managed
-if ! [[ -f ${OUTDIR}/${CNAME}.o ]]
-then
-rustc --crate-name managed $CARGO_PATH/registry/src/github.com-1ecc6299db9ec823/managed-0.7.1/src/lib.rs \
-    --color always --crate-type lib --emit=metadata,llvm-bc \
-    -C opt-level=1 \
-    -C debuginfo=2 \
-    -C debug-assertions=on \
-    --cfg 'feature="alloc"' \
-    --cfg 'feature="map"' \
-    --out-dir ${OUTDIR} \
-    --target $TARGET_JSON \
-    -L ${OUTDIR} \
-    --cap-lints allow
-gen_full_rlib
-fi
-
-CNAME=device_tree
-if ! [[ -f ${OUTDIR}/${CNAME}.o ]]
-then
-rustc --crate-name device_tree $CARGO_PATH/git/checkouts/device_tree-rs-7c4f9e86f346d07b/1bd9b4d*/src/lib.rs \
-    --color always --crate-type lib --emit=metadata,llvm-bc \
-    -C opt-level=1 \
-    -C debuginfo=2 \
-    -C debug-assertions=on \
-    --out-dir ${OUTDIR} \
-    --target $TARGET_JSON \
-    -L ${OUTDIR} \
-    --cap-lints allow
-gen_full_rlib
-fi
-
-CNAME=byteorder
-if ! [[ -f ${OUTDIR}/${CNAME}.o ]]
-then
-rustc --crate-name byteorder $CARGO_PATH/registry/src/github.com-1ecc6299db9ec823/byteorder-1.3.1/src/lib.rs \
-    --color always --crate-type lib --emit=metadata,llvm-bc \
-    -C opt-level=1 \
-    -C debuginfo=2 \
-    -C debug-assertions=on \
-    --out-dir ${OUTDIR} \
-    --target $TARGET_JSON \
-    -L ${OUTDIR} \
-    --cap-lints allow
-gen_full_rlib
-fi
-
-CNAME=log
-if ! [[ -f ${OUTDIR}/${CNAME}.o ]]
-then
-rustc --crate-name log $CARGO_PATH/registry/src/github.com-1ecc6299db9ec823/log-0.4.6/src/lib.rs \
-    --color always --crate-type lib --emit=metadata,llvm-bc \
-    -C opt-level=1 \
-    -C debuginfo=2 \
-    -C debug-assertions=on \
-    --out-dir ${OUTDIR} \
-    --target $TARGET_JSON \
-    -L ${OUTDIR} \
-    --cap-lints allow
-gen_full_rlib
-fi
-
-CNAME=smoltcp
-if ! [[ -f ${OUTDIR}/${CNAME}.o ]]
-then
-rustc --crate-name smoltcp $CARGO_PATH/registry/src/github.com-1ecc6299db9ec823/smoltcp-0.5.0/src/lib.rs \
-    --color always --crate-type lib --emit=metadata,llvm-bc \
-    -C opt-level=1 \
-    -C debuginfo=2 \
-    -C debug-assertions=on \
-    --cfg 'feature="alloc"' \
-    --cfg 'feature="log"' \
-    --cfg 'feature="managed"' \
-    --cfg 'feature="proto-igmp"' \
-    --cfg 'feature="proto-ipv4"' \
-    --cfg 'feature="socket-icmp"' \
-    --cfg 'feature="socket-tcp"' \
-    --cfg 'feature="socket-udp"' \
-    --extern bitflags=${OUTDIR}/libbitflags.rlib \
-    --extern byteorder=${OUTDIR}/libbyteorder.rlib \
-    --extern log=${OUTDIR}/liblog.rlib \
-    --extern managed=${OUTDIR}/libmanaged.rlib \
-    --out-dir ${OUTDIR} \
-    --target $TARGET_JSON \
-    -L ${OUTDIR} \
-    --cap-lints allow
-gen_full_rlib
-fi
-
-CNAME=volatile
-if ! [[ -f ${OUTDIR}/${CNAME}.o ]]
-then
-rustc --crate-name volatile $CARGO_PATH/registry/src/github.com-1ecc6299db9ec823/volatile-0.2.5/src/lib.rs \
-    --color always --crate-type lib --emit=metadata,llvm-bc \
-    -C opt-level=1 \
-    -C debuginfo=2 \
-    -C debug-assertions=on \
-    --out-dir ${OUTDIR} \
-    --target $TARGET_JSON \
-    -L ${OUTDIR} \
-    --cap-lints allow
-gen_full_rlib
-fi
-
-CNAME=once
-if ! [[ -f ${OUTDIR}/${CNAME}.o ]]
-then
-rustc --crate-name once $CARGO_PATH/registry/src/github.com-1ecc6299db9ec823/once-0.3.3/src/lib.rs \
-    --color always --crate-type lib --emit=metadata,llvm-bc \
-    -C opt-level=1 \
-    -C debuginfo=2 \
-    -C debug-assertions=on \
-    --out-dir ${OUTDIR} \
-    --target $TARGET_JSON \
-    -L ${OUTDIR} \
-    --cap-lints allow
-gen_full_rlib
-fi
-
-CNAME=bbl
-if ! [[ -f ${OUTDIR}/${CNAME}.o ]]
-then
-rustc --crate-name bbl $PWD/../crate/bbl/src/lib.rs \
-    --color always --crate-type lib --emit=metadata,llvm-bc \
-    -C opt-level=1 \
-    -C debuginfo=2 \
-    -C debug-assertions=on \
-    --out-dir ${OUTDIR} \
-    --target $TARGET_JSON \
-    -L ${OUTDIR}
-gen_full_rlib
-fi
-
-CNAME=linked_list_allocator
-if ! [[ -f ${OUTDIR}/${CNAME}.o ]]
-then
-rustc --crate-name linked_list_allocator $CARGO_PATH/registry/src/github.com-1ecc6299db9ec823/linked_list_allocator-0.6.3/src/lib.rs \
-    --color always --crate-type lib --emit=metadata,llvm-bc \
-    -C opt-level=1 \
-    -C debuginfo=2 \
-    -C debug-assertions=on \
-    --cfg 'feature="default"' \
-    --cfg 'feature="spin"' \
-    --cfg 'feature="use_spin"' \
-    --out-dir ${OUTDIR} \
-    --target $TARGET_JSON \
-    -L ${OUTDIR} \
-    --cap-lints allow
-gen_full_rlib
-fi
-
-CNAME=lazy_static
-if ! [[ -f ${OUTDIR}/${CNAME}.o ]]
-then
-rustc --crate-name lazy_static $CARGO_PATH/registry/src/github.com-1ecc6299db9ec823/lazy_static-1.2.0/src/lib.rs \
-    --color always --crate-type lib --emit=metadata,llvm-bc \
-    -C opt-level=1 \
-    -C debuginfo=2 \
-    -C debug-assertions=on \
-    --cfg 'feature="spin"' \
-    --cfg 'feature="spin_no_std"' \
-    --out-dir ${OUTDIR} \
-    --target $TARGET_JSON \
-    -L ${OUTDIR} \
-    --cap-lints allow
-gen_full_rlib
-fi
-#
-
-CNAME=xmas_elf
-if ! [[ -f ${OUTDIR}/${CNAME}.o ]]
-then
-rustc --crate-name xmas_elf $CARGO_PATH/registry/src/github.com-1ecc6299db9ec823/xmas-elf-0.6.2/src/lib.rs \
-    --color always --crate-type lib --emit=metadata,llvm-bc \
-    -C opt-level=1 \
-    -C debuginfo=2 \
-    -C debug-assertions=on \
-    --out-dir ${OUTDIR} \
-    --target $TARGET_JSON \
-    -L ${OUTDIR} \
-    --cap-lints allow
-gen_full_rlib
-fi
-
-CNAME=bit_allocator
-if ! [[ -f ${OUTDIR}/${CNAME}.o ]]
-then
-rustc --crate-name bit_allocator $PWD/../crate/bit-allocator/src/lib.rs \
-    --color always --crate-type lib --emit=metadata,llvm-bc \
-    -C opt-level=1 \
-    -C debuginfo=2 \
-    -C debug-assertions=on \
-    --out-dir ${OUTDIR} \
-    --target $TARGET_JSON \
-    -L ${OUTDIR}
-gen_full_rlib
-fi
-
-
-CNAME=simple_filesystem
-if ! [[ -f ${OUTDIR}/${CNAME}.o ]]
-then
-rustc --edition=2018 --crate-name simple_filesystem $CARGO_PATH/git/checkouts/simplefilesystem-rust-868ccb44dbeefdea/48b3c26*/src/lib.rs \
-    --color always --crate-type lib --emit=metadata,llvm-bc \
-    -C opt-level=1 \
-    -C debuginfo=2 \
-    -C debug-assertions=on \
-    --out-dir ${OUTDIR} \
-    --target $TARGET_JSON \
-    -L ${OUTDIR} \
-    --extern bit_vec=${OUTDIR}/libbit_vec.rlib \
-    --extern spin=${OUTDIR}/libspin.rlib \
-    --extern static_assertions=${OUTDIR}/libstatic_assertions.rlib \
-    --cap-lints allow
-gen_full_rlib
-fi
-
-CNAME=rcore_process
-if ! [[ -f ${OUTDIR}/${CNAME}.o ]]
-then
-M_MODE="" rustc --edition=2018 --crate-name rcore_process $PWD/../crate/process/src/lib.rs \
-    --color always --crate-type lib --emit=metadata,llvm-bc \
-    -C opt-level=1 \
-    -C debuginfo=2 \
-    -C debug-assertions=on \
-    --out-dir ${OUTDIR} \
-    --target $TARGET_JSON \
-    --extern log=${OUTDIR}/liblog.rlib \
-    --extern spin=${OUTDIR}/libspin.rlib \
-    -L ${OUTDIR}
-gen_full_rlib
-fi
-
-CNAME=rcore_memory
-if ! [[ -f ${OUTDIR}/${CNAME}.o ]]
-then
-rustc --edition=2018 --crate-name rcore_memory $PWD/../crate/memory/src/lib.rs \
-    --color always --crate-type lib --emit=metadata,llvm-bc \
-    -C opt-level=1 \
-    -C debuginfo=2 \
-    -C debug-assertions=on \
-    --out-dir ${OUTDIR} \
-    --target $TARGET_JSON \
-    --extern log=${OUTDIR}/liblog.rlib \
-    -L ${OUTDIR}
-gen_full_rlib
-fi
-
-CNAME=semver
-if ! [[ -f ${OUTDIR}/${CNAME}.o ]]
-then
-rustc --crate-name semver $CARGO_PATH/registry/src/github.com-1ecc6299db9ec823/semver-0.9.0/src/lib.rs \
-    --color always --crate-type lib --emit=metadata,llvm-bc \
-    -C opt-level=1 \
-    -C debuginfo=2 \
-    -C debug-assertions=on \
-    --cfg 'feature="default"' \
-    --out-dir ${OUTDIR} \
-    -L ${OUTDIR} \
-    --extern semver_parser=${OUTDIR}/libsemver_parser.rlib \
-    --cap-lints allow
-gen_full_rlib
-fi
-
-CNAME=rustc_version
-# omit build_script_build
-if ! [[ -f ${OUTDIR}/${CNAME}.o ]]
-then
-rustc --crate-name rustc_version $CARGO_PATH/registry/src/github.com-1ecc6299db9ec823/rustc_version-0.2.3/src/lib.rs \
-    --color always --crate-type lib --emit=metadata,llvm-bc \
-    -C opt-level=1 \
-    -C debuginfo=2 \
-    -C debug-assertions=on \
-    --out-dir ${OUTDIR} \
-    -L ${OUTDIR} \
-    --extern semver=${OUTDIR}/libsemver.rlib \
-    --cap-lints allow
-gen_full_rlib
-fi
-
-CNAME=bare_metal
-# omit build_script_build
-if ! [[ -f ${OUTDIR}/${CNAME}.o ]]
-then
-rustc --crate-name bare_metal $CARGO_PATH/registry/src/github.com-1ecc6299db9ec823/bare-metal-0.2.4/src/lib.rs \
-    --color always --crate-type lib --emit=metadata,llvm-bc \
-    -C opt-level=1 \
-    -C debuginfo=2 \
-    -C debug-assertions=on \
-    --out-dir ${OUTDIR} \
-    --target $TARGET_JSON \
-    -L ${OUTDIR} \
-    --cap-lints allow
-gen_full_rlib
-fi
-
-CNAME=riscv
-if ! [[ -f ${OUTDIR}/${CNAME}.o ]]
-then
-rustc --crate-name riscv $CARGO_PATH/git/checkouts/riscv-1e845b622ce46f1d/ac09fc6*/src/lib.rs \
-    --color always --crate-type lib --emit=metadata,llvm-bc \
-    -C opt-level=1 \
-    -C debuginfo=2 \
-    -C debug-assertions=on \
-    --out-dir ${OUTDIR} \
-    --target $TARGET_JSON \
-    -L ${OUTDIR} \
-    --extern bare_metal=${OUTDIR}/libbare_metal.rlib \
-    --extern bit_field=${OUTDIR}/libbit_field.rlib \
-    --extern bitflags=${OUTDIR}/libbitflags.rlib \
-    --extern log=${OUTDIR}/liblog.rlib \
-    --cap-lints allow
-gen_full_rlib
-fi
-
-
-# Hand generate build.rs
-if ! [[ -f ${OUTDIR}/libatomic_rt.a ]]
-then
-${CC} src/arch/riscv32/compiler_rt.c ${CFLAGS} -O3 -Wno-builtin-declaration-mismatch -c -o ${OUTDIR}/compiler_rt.o
-${AR} r ${OUTDIR}/libatomic_rt.a ${OUTDIR}/compiler_rt.o
-fi
-
-if ! [[ -f ${OUTDIR}/libsfsimg.a ]]
-then
-cat >${OUTDIR}/sfsimg.S <<EOF
-		.section .rodata
-		.align 12
-		.global _user_img_start
-		.global _user_img_end
-_user_img_start:
-		.incbin "${UCORE_USER_IMAGE}"
-_user_img_end:
-EOF
-if ! ${CC} ${OUTDIR}/sfsimg.S ${CFLAGS} -c -o ${OUTDIR}/sfsimg.o
-then
-	echo "You should manually create sfs image!"
-	exit 1
-fi
-${AR} r ${OUTDIR}/libsfsimg.a ${OUTDIR}/sfsimg.o
-fi
-
-#make sfsimg
-
-
-CNAME=rcore
-#if ! [[ -f ${OUTDIR}/${CNAME}.o ]]
-#then
-if [[ ${board} = k210 ]]; then
-    export UCORE_FEATURE_ARGS='--cfg feature="m_mode" --cfg feature="no_mmu" --cfg feature="board_k210"'
-    cp src/arch/riscv32/board/k210/linker.ld src/arch/riscv32/boot/linker64.ld
-elif [[ ${board} = u540 ]]; then
-    export UCORE_FEATURE_ARGS='--cfg feature="sv39" --cfg feature="board_u540"'
-    cp src/arch/riscv32/board/u540/linker.ld src/arch/riscv32/boot/linker64.ld
-else
-    cp src/arch/riscv32/board/u540/linker.ld src/arch/riscv32/boot/linker64.ld
-fi
-rustc --edition=2018 --crate-name rcore src/lib.rs \
-    --color always --crate-type lib --emit=metadata,llvm-bc \
-    -C opt-level=1 \
-    -C debuginfo=2 \
-    -C debug-assertions=on \
-    ${UCORE_FEATURE_ARGS} \
-    --out-dir ${OUTDIR} \
-    --target $TARGET_JSON \
-    -L ${OUTDIR} \
-    --extern bbl=${OUTDIR}/libbbl.rlib \
-    --extern bit_allocator=${OUTDIR}/libbit_allocator.rlib \
-    --extern bit_field=${OUTDIR}/libbit_field.rlib \
-    --extern bitflags=${OUTDIR}/libbitflags.rlib \
-    --extern lazy_static=${OUTDIR}/liblazy_static.rlib \
-    --extern linked_list_allocator=${OUTDIR}/liblinked_list_allocator.rlib \
-    --extern log=${OUTDIR}/liblog.rlib \
-    --extern once=${OUTDIR}/libonce.rlib \
-    --extern riscv=${OUTDIR}/libriscv.rlib \
-    --extern simple_filesystem=${OUTDIR}/libsimple_filesystem.rlib \
-    --extern spin=${OUTDIR}/libspin.rlib \
-    --extern rcore_memory=${OUTDIR}/librcore_memory.rlib \
-    --extern rcore_process=${OUTDIR}/librcore_process.rlib \
-    --extern volatile=${OUTDIR}/libvolatile.rlib \
-    --extern xmas_elf=${OUTDIR}/libxmas_elf.rlib  \
-    --extern device_tree=${OUTDIR}/libdevice_tree.rlib  \
-    --extern smoltcp=${OUTDIR}/libsmoltcp.rlib  \
-    -L native=${OUTDIR} -l static=sfsimg -l static=atomic_rt
-
-gen_full_rlib
-#fi
-
-#if ! [[ -f ${OUTDIR}/rcore ]]
-#then
-if [[ ${board} = k210 ]]; then
-    export LINK_K210='-L native=kendryte'
-fi
-echo "rustc crate-type bin to ${TARGET_JSON}"
-rustc --edition=2018 --crate-name rcore src/main.rs \
-    --color always --crate-type bin --emit=link \
-    -C opt-level=1 \
-    -C debuginfo=2 \
-    -C debug-assertions=on \
-    --out-dir ${OUTDIR} \
-    --target $TARGET_JSON \
-    -L ${OUTDIR} \
-    --extern bbl=${OUTDIR}/libbbl.rlib \
-    --extern bit_allocator=${OUTDIR}/libbit_allocator.rlib \
-    --extern bit_field=${OUTDIR}/libbit_field.rlib \
-    --extern bitflags=${OUTDIR}/libbitflags.rlib \
-    --extern lazy_static=${OUTDIR}/liblazy_static.rlib \
-    --extern linked_list_allocator=${OUTDIR}/liblinked_list_allocator.rlib \
-    --extern log=${OUTDIR}/liblog.rlib \
-    --extern once=${OUTDIR}/libonce.rlib \
-    --extern riscv=${OUTDIR}/libriscv.rlib \
-    --extern simple_filesystem=${OUTDIR}/libsimple_filesystem.rlib \
-    --extern spin=${OUTDIR}/libspin.rlib \
-    --extern rcore=${OUTDIR}/librcore.rlib \
-    --extern rcore_memory=${OUTDIR}/librcore_memory.rlib \
-    --extern rcore_process=${OUTDIR}/librcore_process.rlib \
-    --extern volatile=${OUTDIR}/libvolatile.rlib \
-    --extern xmas_elf=${OUTDIR}/libxmas_elf.rlib \
-    --extern device_tree=${OUTDIR}/libdevice_tree.rlib  \
-    --extern smoltcp=${OUTDIR}/libsmoltcp.rlib  \
-    -L native=${OUTDIR} ${LINK_K210}
-#fi
diff --git a/kernel/build.rs b/kernel/build.rs
index 6d4043f..5adf240 100644
--- a/kernel/build.rs
+++ b/kernel/build.rs
@@ -13,14 +13,6 @@ fn main() {
 			gen_vector_asm().unwrap();
 		}
 		"riscv32" => {
-			println!("cargo:rerun-if-changed=src/arch/riscv32/compiler_rt.c");
-			cc::Build::new()
-				.file("src/arch/riscv32/compiler_rt.c")
-				.flag("-march=rv32imac")
-				.flag("-mabi=ilp32")
-    			.flag("-Wno-builtin-declaration-mismatch")
-    			.flag("-O3")
-				.compile("atomic_rt");
 			if let Ok(file_path) = gen_sfsimg_asm() {
 				cc::Build::new()
 					.file(&file_path)
@@ -29,6 +21,15 @@ fn main() {
 					.compile("sfsimg");
 			}
 		}
+		"riscv64" => {
+			if let Ok(file_path) = gen_sfsimg_asm() {
+				cc::Build::new()
+					.file(&file_path)
+					.flag("-march=rv64imac")
+					.flag("-mabi=lp64")
+					.compile("sfsimg");
+			}
+		}
 		"aarch64" => {
 			if let Ok(file_path) = gen_sfsimg_asm() {
 				cc::Build::new().file(&file_path).compile("sfsimg");
diff --git a/kernel/src/arch/riscv32/compiler_rt.c b/kernel/src/arch/riscv32/compiler_rt.c
deleted file mode 100644
index 8125759..0000000
--- a/kernel/src/arch/riscv32/compiler_rt.c
+++ /dev/null
@@ -1,135 +0,0 @@
-// http://llvm.org/docs/Atomics.html#libcalls-atomic
-
-inline void mb() {
-    __asm__ __volatile__("fence" ::: "memory");
-}
-
-typedef unsigned u32;
-
-// K210 doesn't support atomic operation on 0x40000000 (io port)
-// We have to detect it and move it to 0x80000000
-inline u32* fix_ptr32(u32 *ptr) {
-    return ptr < (u32*)0x80000000?
-            ptr + 0x40000000 / sizeof(u32):
-            ptr;
-}
-
-u32 __atomic_load_1(u32 *ptr) {
-    ptr = fix_ptr32(ptr);
-    return *ptr;
-}
-
-u32 __atomic_load_2(u32 *ptr) {
-    ptr = fix_ptr32(ptr);
-    return *ptr;
-}
-
-// relaxed
-u32 __atomic_load_4(u32 *ptr) {
-    ptr = fix_ptr32(ptr);
-    return *ptr;
-}
-
-// release
-void __atomic_store_4(u32 *ptr, u32 val) {
-    ptr = fix_ptr32(ptr);
-    mb();
-    __asm__ __volatile__("amoswap.w zero, %0, (%1)" :: "r"(val), "r"(ptr) : "memory");
-}
-
-// strong, acquire
-char __atomic_compare_exchange_4(u32* ptr, u32* expected, u32 desired) {
-    ptr = fix_ptr32(ptr);
-    u32 val, expect = *expected, result, ret;
-    while(1) {
-        __asm__ __volatile__("lr.w.aq %0, (%1)" : "=r"(val) : "r"(ptr) : "memory");
-
-        ret = val == expect;
-        if(!ret) {
-            // *expected should always equal to the previous value of *ptr
-            *expected = val;
-            return ret;
-        }
-
-        // Try: *ptr = desired. If success, result == 0, otherwise result != 0.
-        __asm__ __volatile__("sc.w.aq %0, %1, (%2)" : "=r"(result) : "r"(desired), "r"(ptr) : "memory");
-        if(result == 0) {
-            return ret;
-        }
-    }
-}
-
-u32 __atomic_fetch_add_4(u32* ptr, u32 val) {
-    ptr = fix_ptr32(ptr);
-    u32 res;
-    __asm__ __volatile__("amoadd.w %0, %1, (%2)" : "=r"(res) : "r"(val), "r"(ptr) : "memory");
-    return res;
-}
-
-u32 __atomic_fetch_sub_4(u32* ptr, u32 val) {
-    ptr = fix_ptr32(ptr);
-    u32 res;
-    __asm__ __volatile__("amoadd.w %0, %1, (%2)" : "=r"(res) : "r"(-val), "r"(ptr) : "memory");
-    return res;
-}
-
-#if __riscv_xlen == 64
-typedef unsigned long long u64;
-
-// K210 doesn't support atomic operation on 0x40000000 (io port)
-// We have to detect it and move it to 0x80000000
-inline u64* fix_ptr64(u64 *ptr) {
-    return ptr < (u64*)0x80000000?
-            ptr + 0x40000000 / sizeof(u64):
-            ptr;
-}
-
-// relaxed
-u64 __atomic_load_8(u64 *ptr) {
-    ptr = fix_ptr64(ptr);
-    return *ptr;
-}
-
-// release
-void __atomic_store_8(u64 *ptr, u64 val) {
-    ptr = fix_ptr64(ptr);
-    mb();
-    __asm__ __volatile__("amoswap.d zero, %0, (%1)" :: "r"(val), "r"(ptr) : "memory");
-}
-
-// strong, acquire
-char __atomic_compare_exchange_8(u64* ptr, u64* expected, u64 desired) {
-    ptr = fix_ptr64(ptr);
-    u64 val, expect = *expected, result, ret;
-    while(1) {
-        __asm__ __volatile__("lr.d.aq %0, (%1)" : "=r"(val) : "r"(ptr) : "memory");
-
-        ret = val == expect;
-        if(!ret) {
-            // *expected should always equal to the previous value of *ptr
-            *expected = val;
-            return ret;
-        }
-
-        // Try: *ptr = desired. If success, result == 0, otherwise result != 0.
-        __asm__ __volatile__("sc.d.aq %0, %1, (%2)" : "=r"(result) : "r"(desired), "r"(ptr) : "memory");
-        if(result == 0) {
-            return ret;
-        }
-    }
-}
-
-u64 __atomic_fetch_add_8(u64* ptr, u64 val) {
-    ptr = fix_ptr64(ptr);
-    u64 res;
-    __asm__ __volatile__("amoadd.d %0, %1, (%2)" : "=r"(res) : "r"(val), "r"(ptr) : "memory");
-    return res;
-}
-
-u64 __atomic_fetch_sub_8(u64* ptr, u64 val) {
-    ptr = fix_ptr64(ptr);
-    u64 res;
-    __asm__ __volatile__("amoadd.d %0, %1, (%2)" : "=r"(res) : "r"(-val), "r"(ptr) : "memory");
-    return res;
-}
-#endif
diff --git a/kernel/targets/riscv32.json b/kernel/targets/riscv32.json
index 9430baf..377a0e5 100644
--- a/kernel/targets/riscv32.json
+++ b/kernel/targets/riscv32.json
@@ -7,7 +7,7 @@
   "os": "none",
   "arch": "riscv32",
   "cpu": "generic-rv32",
-  "features": "",
+  "features": "+m,+a,+c",
   "max-atomic-width": "32",
   "linker": "rust-lld",
   "linker-flavor": "ld.lld",
diff --git a/kernel/targets/riscv64.json b/kernel/targets/riscv64.json
index 7cf840a..7448021 100644
--- a/kernel/targets/riscv64.json
+++ b/kernel/targets/riscv64.json
@@ -7,8 +7,8 @@
   "os": "none",
   "arch": "riscv64",
   "cpu": "generic-rv64",
-  "features": "",
-  "max-atomic-width": "32",
+  "features": "+m,+a,+c",
+  "max-atomic-width": "64",
   "linker": "rust-lld",
   "linker-flavor": "ld.lld",
   "pre-link-args": {