diff --git a/.travis.yml b/.travis.yml
index c244505..63c2356 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -51,6 +51,7 @@ install:
     fi
 
 script:
+  - cd ucore
   - mkdir build && cd build
   - cmake -DARCH=$ARCH ..
   - make
diff --git a/CMakeLists.txt b/ucore/CMakeLists.txt
similarity index 100%
rename from CMakeLists.txt
rename to ucore/CMakeLists.txt
diff --git a/src/arch/aarch64/arch.h b/ucore/src/arch/aarch64/arch.h
similarity index 100%
rename from src/arch/aarch64/arch.h
rename to ucore/src/arch/aarch64/arch.h
diff --git a/src/arch/aarch64/atomic.h b/ucore/src/arch/aarch64/atomic.h
similarity index 100%
rename from src/arch/aarch64/atomic.h
rename to ucore/src/arch/aarch64/atomic.h
diff --git a/src/arch/aarch64/initcode.S b/ucore/src/arch/aarch64/initcode.S
similarity index 100%
rename from src/arch/aarch64/initcode.S
rename to ucore/src/arch/aarch64/initcode.S
diff --git a/src/arch/i386/arch.h b/ucore/src/arch/i386/arch.h
similarity index 100%
rename from src/arch/i386/arch.h
rename to ucore/src/arch/i386/arch.h
diff --git a/src/arch/i386/atomic.h b/ucore/src/arch/i386/atomic.h
similarity index 100%
rename from src/arch/i386/atomic.h
rename to ucore/src/arch/i386/atomic.h
diff --git a/src/arch/i386/initcode.S b/ucore/src/arch/i386/initcode.S
similarity index 100%
rename from src/arch/i386/initcode.S
rename to ucore/src/arch/i386/initcode.S
diff --git a/src/arch/riscv/arch.h b/ucore/src/arch/riscv/arch.h
similarity index 100%
rename from src/arch/riscv/arch.h
rename to ucore/src/arch/riscv/arch.h
diff --git a/src/arch/riscv/atomic.h b/ucore/src/arch/riscv/atomic.h
similarity index 100%
rename from src/arch/riscv/atomic.h
rename to ucore/src/arch/riscv/atomic.h
diff --git a/src/arch/riscv/initcode.S b/ucore/src/arch/riscv/initcode.S
similarity index 100%
rename from src/arch/riscv/initcode.S
rename to ucore/src/arch/riscv/initcode.S
diff --git a/src/arch/riscv/sbi.h b/ucore/src/arch/riscv/sbi.h
similarity index 100%
rename from src/arch/riscv/sbi.h
rename to ucore/src/arch/riscv/sbi.h
diff --git a/src/badarg.c b/ucore/src/badarg.c
similarity index 100%
rename from src/badarg.c
rename to ucore/src/badarg.c
diff --git a/src/badsegment.c b/ucore/src/badsegment.c
similarity index 100%
rename from src/badsegment.c
rename to ucore/src/badsegment.c
diff --git a/src/divzero.c b/ucore/src/divzero.c
similarity index 100%
rename from src/divzero.c
rename to ucore/src/divzero.c
diff --git a/src/exit.c b/ucore/src/exit.c
similarity index 100%
rename from src/exit.c
rename to ucore/src/exit.c
diff --git a/src/faultread.c b/ucore/src/faultread.c
similarity index 100%
rename from src/faultread.c
rename to ucore/src/faultread.c
diff --git a/src/faultreadkernel.c b/ucore/src/faultreadkernel.c
similarity index 100%
rename from src/faultreadkernel.c
rename to ucore/src/faultreadkernel.c
diff --git a/src/forktest.c b/ucore/src/forktest.c
similarity index 100%
rename from src/forktest.c
rename to ucore/src/forktest.c
diff --git a/src/forktree.c b/ucore/src/forktree.c
similarity index 100%
rename from src/forktree.c
rename to ucore/src/forktree.c
diff --git a/src/hello.c b/ucore/src/hello.c
similarity index 100%
rename from src/hello.c
rename to ucore/src/hello.c
diff --git a/src/libs/defs.h b/ucore/src/libs/defs.h
similarity index 100%
rename from src/libs/defs.h
rename to ucore/src/libs/defs.h
diff --git a/src/libs/dirent.h b/ucore/src/libs/dirent.h
similarity index 100%
rename from src/libs/dirent.h
rename to ucore/src/libs/dirent.h
diff --git a/src/libs/elf.h b/ucore/src/libs/elf.h
similarity index 100%
rename from src/libs/elf.h
rename to ucore/src/libs/elf.h
diff --git a/src/libs/error.h b/ucore/src/libs/error.h
similarity index 100%
rename from src/libs/error.h
rename to ucore/src/libs/error.h
diff --git a/src/libs/hash.c b/ucore/src/libs/hash.c
similarity index 100%
rename from src/libs/hash.c
rename to ucore/src/libs/hash.c
diff --git a/src/libs/list.h b/ucore/src/libs/list.h
similarity index 100%
rename from src/libs/list.h
rename to ucore/src/libs/list.h
diff --git a/src/libs/printfmt.c b/ucore/src/libs/printfmt.c
similarity index 100%
rename from src/libs/printfmt.c
rename to ucore/src/libs/printfmt.c
diff --git a/src/libs/rand.c b/ucore/src/libs/rand.c
similarity index 100%
rename from src/libs/rand.c
rename to ucore/src/libs/rand.c
diff --git a/src/libs/skew_heap.h b/ucore/src/libs/skew_heap.h
similarity index 100%
rename from src/libs/skew_heap.h
rename to ucore/src/libs/skew_heap.h
diff --git a/src/libs/stat.h b/ucore/src/libs/stat.h
similarity index 100%
rename from src/libs/stat.h
rename to ucore/src/libs/stat.h
diff --git a/src/libs/stdarg.h b/ucore/src/libs/stdarg.h
similarity index 100%
rename from src/libs/stdarg.h
rename to ucore/src/libs/stdarg.h
diff --git a/src/libs/stdio.h b/ucore/src/libs/stdio.h
similarity index 100%
rename from src/libs/stdio.h
rename to ucore/src/libs/stdio.h
diff --git a/src/libs/stdlib.h b/ucore/src/libs/stdlib.h
similarity index 100%
rename from src/libs/stdlib.h
rename to ucore/src/libs/stdlib.h
diff --git a/src/libs/string.c b/ucore/src/libs/string.c
similarity index 100%
rename from src/libs/string.c
rename to ucore/src/libs/string.c
diff --git a/src/libs/string.h b/ucore/src/libs/string.h
similarity index 100%
rename from src/libs/string.h
rename to ucore/src/libs/string.h
diff --git a/src/libs/unistd.h b/ucore/src/libs/unistd.h
similarity index 100%
rename from src/libs/unistd.h
rename to ucore/src/libs/unistd.h
diff --git a/src/ls.c b/ucore/src/ls.c
similarity index 100%
rename from src/ls.c
rename to ucore/src/ls.c
diff --git a/src/matrix.c b/ucore/src/matrix.c
similarity index 100%
rename from src/matrix.c
rename to ucore/src/matrix.c
diff --git a/src/pgdir.c b/ucore/src/pgdir.c
similarity index 100%
rename from src/pgdir.c
rename to ucore/src/pgdir.c
diff --git a/src/priority.c b/ucore/src/priority.c
similarity index 100%
rename from src/priority.c
rename to ucore/src/priority.c
diff --git a/src/sfs_filetest1.c b/ucore/src/sfs_filetest1.c
similarity index 100%
rename from src/sfs_filetest1.c
rename to ucore/src/sfs_filetest1.c
diff --git a/src/sh.c b/ucore/src/sh.c
similarity index 100%
rename from src/sh.c
rename to ucore/src/sh.c
diff --git a/src/sleep.c b/ucore/src/sleep.c
similarity index 100%
rename from src/sleep.c
rename to ucore/src/sleep.c
diff --git a/src/sleepkill.c b/ucore/src/sleepkill.c
similarity index 100%
rename from src/sleepkill.c
rename to ucore/src/sleepkill.c
diff --git a/src/softint.c b/ucore/src/softint.c
similarity index 100%
rename from src/softint.c
rename to ucore/src/softint.c
diff --git a/src/spin.c b/ucore/src/spin.c
similarity index 100%
rename from src/spin.c
rename to ucore/src/spin.c
diff --git a/src/testbss.c b/ucore/src/testbss.c
similarity index 100%
rename from src/testbss.c
rename to ucore/src/testbss.c
diff --git a/src/ulibs/dir.c b/ucore/src/ulibs/dir.c
similarity index 100%
rename from src/ulibs/dir.c
rename to ucore/src/ulibs/dir.c
diff --git a/src/ulibs/dir.h b/ucore/src/ulibs/dir.h
similarity index 100%
rename from src/ulibs/dir.h
rename to ucore/src/ulibs/dir.h
diff --git a/src/ulibs/file.c b/ucore/src/ulibs/file.c
similarity index 100%
rename from src/ulibs/file.c
rename to ucore/src/ulibs/file.c
diff --git a/src/ulibs/file.h b/ucore/src/ulibs/file.h
similarity index 100%
rename from src/ulibs/file.h
rename to ucore/src/ulibs/file.h
diff --git a/src/ulibs/lock.h b/ucore/src/ulibs/lock.h
similarity index 100%
rename from src/ulibs/lock.h
rename to ucore/src/ulibs/lock.h
diff --git a/src/ulibs/panic.c b/ucore/src/ulibs/panic.c
similarity index 100%
rename from src/ulibs/panic.c
rename to ucore/src/ulibs/panic.c
diff --git a/src/ulibs/stdio.c b/ucore/src/ulibs/stdio.c
similarity index 100%
rename from src/ulibs/stdio.c
rename to ucore/src/ulibs/stdio.c
diff --git a/src/ulibs/syscall.c b/ucore/src/ulibs/syscall.c
similarity index 100%
rename from src/ulibs/syscall.c
rename to ucore/src/ulibs/syscall.c
diff --git a/src/ulibs/syscall.h b/ucore/src/ulibs/syscall.h
similarity index 100%
rename from src/ulibs/syscall.h
rename to ucore/src/ulibs/syscall.h
diff --git a/src/ulibs/ulib.c b/ucore/src/ulibs/ulib.c
similarity index 100%
rename from src/ulibs/ulib.c
rename to ucore/src/ulibs/ulib.c
diff --git a/src/ulibs/ulib.h b/ucore/src/ulibs/ulib.h
similarity index 100%
rename from src/ulibs/ulib.h
rename to ucore/src/ulibs/ulib.h
diff --git a/src/ulibs/umain.c b/ucore/src/ulibs/umain.c
similarity index 100%
rename from src/ulibs/umain.c
rename to ucore/src/ulibs/umain.c
diff --git a/src/waitkill.c b/ucore/src/waitkill.c
similarity index 100%
rename from src/waitkill.c
rename to ucore/src/waitkill.c
diff --git a/src/yield.c b/ucore/src/yield.c
similarity index 100%
rename from src/yield.c
rename to ucore/src/yield.c