diff --git a/kernel/Makefile b/kernel/Makefile
index 0053184..acca445 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -12,11 +12,13 @@
 #   d    = int | in_asm | ...	QEMU debug info
 #   mode = debug | release
 #   LOG  = off | error | warn | info | debug | trace
+#   smp                         SMP core number
 #   board 						Only available on riscv32, build without bbl, run on board
 
 arch ?= riscv32
 mode ?= debug
 LOG  ?= debug
+smp  ?= 1
 
 target := $(arch)-blog_os
 kernel := target/$(target)/$(mode)/ucore
@@ -31,12 +33,12 @@ ifeq ($(arch), x86_64)
 qemu_opts := \
 	-drive format=raw,file=$(bootimage) \
 	-drive format=raw,file=$(SFSIMG),media=disk,cache=writeback \
-	-smp 4 \
+	-smp $(smp) \
 	-serial mon:stdio \
 	-device isa-debug-exit
 endif
 ifeq ($(arch), riscv32)
-qemu_opts := -machine virt -kernel $(bin) -nographic
+qemu_opts := -machine virt -kernel $(bin) -nographic -smp cpus=$(smp)
 endif
 
 ifdef board
@@ -69,7 +71,7 @@ ifeq ($(uname), Darwin)
 prefix := x86_64-elf-
 endif
 ifeq ($(arch), riscv32)
-prefix := riscv64-unknown-elf-
+prefix := riscv32-unknown-elf-
 endif
 
 ld := $(prefix)ld
@@ -118,7 +120,7 @@ else
 	 	--enable-32bit \
 	 	--enable-logo \
 	 	--disable-fp-emulation \
-	 	--host=riscv64-unknown-elf \
+	 	--host=riscv32-unknown-elf \
 	 	--with-payload=$(abspath $(kernel)) && \
 	 make && \
 	 cp bbl ../../kernel/$@
diff --git a/kernel/src/arch/riscv32/boot/entry.asm b/kernel/src/arch/riscv32/boot/entry.asm
index 8bb9268..0485f0e 100644
--- a/kernel/src/arch/riscv32/boot/entry.asm
+++ b/kernel/src/arch/riscv32/boot/entry.asm
@@ -1,14 +1,19 @@
     .section .text.entry
     .globl _start
 _start:
-    lui  sp, %hi(bootstacktop)
-    addi sp, sp, %lo(bootstacktop)
+    add t0, a0, 1
+    slli t0, t0, 16
+    
+    lui sp, %hi(bootstack)
+    addi sp, sp, %lo(bootstack)
+    add sp, sp, t0
+
     call rust_main
 
     .section .bss
     .align 12  #PGSHIFT
     .global bootstack
 bootstack:
-    .space 4096 * 16  #KSTACKSIZE
+    .space 4096 * 16 * 8
     .global bootstacktop
 bootstacktop:
diff --git a/kernel/src/arch/riscv32/mod.rs b/kernel/src/arch/riscv32/mod.rs
index 13d9ad3..298c814 100644
--- a/kernel/src/arch/riscv32/mod.rs
+++ b/kernel/src/arch/riscv32/mod.rs
@@ -7,10 +7,11 @@ pub mod timer;
 pub mod paging;
 pub mod memory;
 pub mod compiler_rt;
+pub mod smp;
 
 #[no_mangle]
-pub extern fn rust_main() -> ! {
-    println!("Hello RISCV! {}", 123);
+pub extern fn rust_main(hartid: usize) -> ! {
+    println!("Hello RISCV! {}", hartid);
     ::logging::init();
     interrupt::init();
     memory::init();
diff --git a/riscv-pk/configure b/riscv-pk/configure
index 49dddf3..6b316db 100755
--- a/riscv-pk/configure
+++ b/riscv-pk/configure
@@ -4084,8 +4084,8 @@ fi
 case "${BUILD_32BIT}" in
   yes|default)
 	echo "Building 32-bit pk"
-	CFLAGS="$default_CFLAGS -march=rv32i -mabi=ilp32"
-	LDFLAGS="-march=rv32i -mabi=ilp32"
+	CFLAGS="$default_CFLAGS -march=rv32ia -mabi=ilp32"
+	LDFLAGS="-march=rv32ia -mabi=ilp32"
 	install_subdir="riscv32-unknown-elf"
 	;;
   *)
diff --git a/riscv-pk/configure.ac b/riscv-pk/configure.ac
index 107a3f2..5a06896 100644
--- a/riscv-pk/configure.ac
+++ b/riscv-pk/configure.ac
@@ -88,8 +88,8 @@ AC_ARG_ENABLE([32bit],
 case "${BUILD_32BIT}" in
   yes|default)
 	echo "Building 32-bit pk"
-	CFLAGS="$default_CFLAGS -march=rv32i -mabi=ilp32"
-	LDFLAGS="-march=rv32i -mabi=ilp32"
+	CFLAGS="$default_CFLAGS -march=rv32ia -mabi=ilp32"
+	LDFLAGS="-march=rv32ia -mabi=ilp32"
 	install_subdir="riscv32-unknown-elf"
 	;;
   *)