diff --git a/arch/arch.c b/arch/arch.c
index 7809cffa..071709a3 100644
--- a/arch/arch.c
+++ b/arch/arch.c
@@ -21,6 +21,8 @@ void arch_init(boot_info_t* boot, int cpu) {
     interrupt_init(cpu);
     platform_end();
   } else {
+#ifdef MP_ENABLE
     ap_init(cpu);
+#endif
   }
 }
\ No newline at end of file
diff --git a/arch/armv7/context.c b/arch/armv7/context.c
index bac58553..a62c6556 100644
--- a/arch/armv7/context.c
+++ b/arch/armv7/context.c
@@ -20,7 +20,7 @@ int context_get_mode(context_t* context) {
 }
 
 void context_init(context_t* context, u32* entry, u32* stack0, u32* stack3,
-                  u32 level) {
+                  u32 level, int cpu) {
   if (context == NULL) {
     return;
   }
diff --git a/arch/armv7/context.h b/arch/armv7/context.h
index 35820f96..aceb2a74 100644
--- a/arch/armv7/context.h
+++ b/arch/armv7/context.h
@@ -10,6 +10,18 @@
 #include "libs/include/types.h"
 #include "platform/platform.h"
 
+
+typedef struct context_t {
+  u32 esp0, ss0, ds0;
+  u32 esp, ss, ds;
+  u32 eip;
+  tss_t* tss;
+  u32* page_dir;
+  u32* kernel_page_dir;
+  u32 level;
+} context_t;
+
+
 typedef struct interrupt_context {
   // manual push
   u32 no;
@@ -56,6 +68,18 @@ typedef struct interrupt_context {
       :                                    \
       : "i"(VEC), "i"(CODE))
 
+#define interrupt_exit_ret()   \
+  asm volatile(                              \ 
+      "mov r0,r0 \n"                           \
+      "ldmfd r0!,{r1,r2}\n"                    \
+      "ldmfd r0!,{r4-r11}\n"                   \
+      "msr psp, r0\n"                          \
+      "mov lr,#0xFFFFFFFD\n"                   \
+      "isb\n"                                  \
+      "bx lr\n"                                \
+                                             : \
+                                             : )
+
 #define interrupt_exit_context(duck_context)   \
   asm volatile(                              \ 
       "ldr r0,%0 \n"                           \
@@ -90,7 +114,9 @@ typedef struct interrupt_context {
 
 #define context_fn(context) context->r6
 #define context_ret(context) context->r0
-
+#define context_set_entry(context, entry) \
+  ((interrupt_context_t*)((context)->esp0))->lr = entry + 4;
+  
 #define context_restore(duck_context)          \
   asm volatile(                              \ 
       "ldr r0,%0 \n"                           \
@@ -111,7 +137,7 @@ typedef struct interrupt_context {
 void context_clone(context_t* context, context_t* src, u32* stack0, u32* stack3,
                    u32* old0, u32* old3);
 void context_init(context_t* context, u32* entry, u32* stack0, u32* stack3,
-                  u32 level);
+                  u32 level, int cpu);
 void context_dump(context_t* c);
 
 
diff --git a/arch/armv7/cpu.c b/arch/armv7/cpu.c
index 43497fca..9e47cf27 100644
--- a/arch/armv7/cpu.c
+++ b/arch/armv7/cpu.c
@@ -278,3 +278,8 @@ void cpu_backtrace(void) {
     topfp = fp;
   }
 }
+
+
+int cpu_get_id(){
+  return 0;
+}
\ No newline at end of file
diff --git a/arch/armv7/cpu.h b/arch/armv7/cpu.h
index 0ea4f9ea..8f1152ed 100644
--- a/arch/armv7/cpu.h
+++ b/arch/armv7/cpu.h
@@ -11,16 +11,6 @@
 
 #define debugger
 
-typedef struct context_t {
-  u32 esp0, ss0, ds0;
-  u32 esp, ss, ds;
-  u32 eip;
-  tss_t* tss;
-  u32* page_dir;
-  u32* kernel_page_dir;
-  u32 level;
-} context_t;
-
 typedef struct cpsr {
   union {
     struct {
diff --git a/boot/arm/SConscript b/boot/arm/SConscript
index 6f0305c5..101e6130 100644
--- a/boot/arm/SConscript
+++ b/boot/arm/SConscript
@@ -22,13 +22,12 @@ boot_source= ['boot_'+env['ARCH']+'.s']
 if env.get('MYLIB'):
     source.append(env.get('MYLIB'))
 
-env.GenerateKernelSize('config.h',['../../init/kernel'])
 
 if env['PLATFORM']=='stm32f4xx':
     linkflags='-nostdlib -nostartfiles -T boot/arm/link-stm32f4xx.ld'
     source=['init_armv7.c']
     boot_source=['boot_armv7.s',]
-    cflags+='-DNO_KSTART'
+    cflags+=' -DNO_KSTART '
 
 elif env['PLATFORM']=='raspi2':
     linkflags='-nostdlib -nostartfiles -T boot/arm/link-raspi2.ld'
@@ -36,8 +35,13 @@ else:
 
     pass
 
-env.Object('boot.o',boot_source,ASFLAGS='')
-env.Program(target ='init.elf', source = source,
-    CFLAGS=cflags,
-    LINKFLAGS= linkflags)
-env.Objcopy('init.bin','init.elf',OBJCOPYFLAGS='-O binary -S --strip-debug')
\ No newline at end of file
+if env['PLATFORM']=='stm32f4xx':
+    env.Object('boot.o',boot_source,ASFLAGS='')
+    env.Object('init.o',source,ASFLAGS='', CFLAGS=cflags,LINKFLAGS= linkflags)
+else:
+    env.GenerateKernelSize('config.h',['../../init/kernel'])
+    env.Object('boot.o',boot_source,ASFLAGS='')
+    env.Program(target ='init.elf', source = source,
+        CFLAGS=cflags,
+        LINKFLAGS= linkflags)
+    env.Objcopy('init.bin','init.elf',OBJCOPYFLAGS='-O binary -S --strip-debug')
\ No newline at end of file
diff --git a/boot/arm/config.h b/boot/arm/config.h
index 1e2fb73c..14764cac 100644
--- a/boot/arm/config.h
+++ b/boot/arm/config.h
@@ -1,5 +1,5 @@
 #ifndef BOOT/ARM/CONFIG_H
 #define BOOT/ARM/CONFIG_H
-#define KERNEL_BLOCK_SIZE 169
-#define KERNEL_SIZE 172948
+#define KERNEL_BLOCK_SIZE 194
+#define KERNEL_SIZE 197672
 #endif
diff --git a/boot/arm/link.ld b/boot/arm/link.ld
index 391e5297..cdeb85e3 100644
--- a/boot/arm/link.ld
+++ b/boot/arm/link.ld
@@ -1,9 +1,36 @@
 ENTRY(_start)
+
+__heap_size  = 0x200;
+__stack_size = 0x200;
+
 SECTIONS
 {
-. = 0x0000;
-.text : { KEEP(*(.text.boot)) *(.text .text.* .gnu.linkonce.t*) }
-.data : {*(.data)}
-.bss : {*(.bss)}
-sp_top = .;
+    . = 0x000;
+    .text : { KEEP(*(.text.boot)) *(.text .text.* .gnu.linkonce.t*) }
+    .data : {*(.data)}
+    .bss : {*(.bss)}
+    .stack :  ALIGN(4) {
+        . = 0x6000;
+        _estack = .;
+        . = . + __stack_size;
+        _stack_abt = .;
+
+        . = . + __stack_size;
+        _stack_undf = .;
+
+        . = . + __stack_size;
+        _stack_irq = .;
+
+        . = . + __stack_size;
+        _stack_svc = .;
+
+
+        . = . + __stack_size*4*4 ;
+        _stack_other = .;
+
+        
+        . = ALIGN(4);
+        _sstack = .;
+    }
+
 }
\ No newline at end of file
diff --git a/init/SConscript b/init/SConscript
index b164cce1..bea0498b 100644
--- a/init/SConscript
+++ b/init/SConscript
@@ -13,7 +13,7 @@ Import('env')
 linkflags=' $LINKFLAGS -Xlinker -Map=kernel.map -T'+env.get('LINKLD')
 
 libs=[
-     '../modules/libdriver.a',
+     '../modules/libmodules.a',
     '../kernel/libyiyiya.a',
     '../arch/libarch.a',
     '../platform/libplatform.a',
@@ -36,8 +36,9 @@ if env.get('ARCHTYPE')=='xtensa':
     pass
 elif env.get('ARCHTYPE')=='arm':
     if env.get('ARCH')=='armv7':
-        kernel.append('../boot/arm/boot_armv7.s')
-        kernel.append('../boot/arm/init_armv7.c')
+        kernel.append('../boot/arm/boot.o')
+        kernel.append('../boot/arm/init.o')
+        pass
     else:
         pass
 if env.get('MYLIB'):
diff --git a/kernel/config.h b/kernel/config.h
index a47fcdfe..fa00175f 100644
--- a/kernel/config.h
+++ b/kernel/config.h
@@ -27,6 +27,8 @@
 
 #define PAGE_SIZE 0x1000
 
+#define MP_ENABLE 1 //多cpu
+
 #elif defined(ARMV7)
 
 #define MAX_FD_NUMBER 50
@@ -66,6 +68,7 @@
 #define THREAD_STACK_SIZE 4096*4
 #define PAGE_SIZE 0x1000
 
+#define MP_ENABLE 1 //多cpu
 #endif
 
 
@@ -79,7 +82,7 @@
 // #define LOG_DEBUG 0
 
 #define MAX_PATH_BUFFER 256 //最长文件路径
-#define MP_ENABLE 1 //多cpu
+
 
 #include "logger.h"
 
diff --git a/kernel/exceptions.c b/kernel/exceptions.c
index daa70fbf..76e6250e 100644
--- a/kernel/exceptions.c
+++ b/kernel/exceptions.c
@@ -208,7 +208,7 @@ INTERRUPT_SERVICE
 void sys_tick_handler() {
   interrupt_entering_code(2, 0);
   interrupt_process(do_schedule);
-  interrupt_exit_context(current_context);
+  interrupt_exit_ret();
 }
 
 INTERRUPT_SERVICE
diff --git a/platform/v3s/init.c b/platform/v3s/init.c
index 46c8c3de..8db13613 100644
--- a/platform/v3s/init.c
+++ b/platform/v3s/init.c
@@ -1,6 +1,5 @@
 #include "init.h"
 
-#include "gpio/v3s.h"
 #include "gpio.h"
 #include "v3s-reg-ccu.h"
 
@@ -146,4 +145,21 @@ void platform_init() {
   // sys_dram_init();
 }
 
-void platform_end() {}
\ No newline at end of file
+void platform_end() {}
+
+
+void ipi_enable(int cpu) {
+
+}
+
+void lcpu_send_start(u32 cpu, u32 entry) {
+
+}
+
+void ipi_send(int cpu, int vec) {
+
+}
+
+void ipi_clear(int cpu) {
+
+}
\ No newline at end of file