diff --git a/src/arch/riscv64/intr/plic.cpp b/src/arch/riscv64/intr/plic.cpp
index f54fff536..27e8877fb 100755
--- a/src/arch/riscv64/intr/plic.cpp
+++ b/src/arch/riscv64/intr/plic.cpp
@@ -34,6 +34,8 @@ static int32_t external_intr(int, char**) {
     auto no = PLIC::get_instance().get();
     // 根据中断号判断设备
     printf("external_intr: 0x%X.\n", no);
+    PLIC::get_instance().do_externel_interrupt(no);
+    info("external_intr done: 0x%X.\n", no);
     return 0;
 }
 
diff --git a/src/device/device_base.cpp b/src/device/device_base.cpp
index 10ca02ca3..35ce680ff 100644
--- a/src/device/device_base.cpp
+++ b/src/device/device_base.cpp
@@ -34,23 +34,34 @@ device_base_t::~device_base_t(void) {
     return;
 }
 
-int device_base_t::read(void) {
-    auto res = drv->read(buf);
+int device_base_t::read(buf_t& _buf) {
+    buf.sector = _buf.sector;
+    auto res   = drv->read(buf);
+
     // 等待中断完成
     while (buf.valid == false) {
         ;
     }
+
+    memcpy(_buf.data, buf.data, COMMON::BUFFFER_SIZE);
+
     buf.valid = false;
+
     return res;
 }
 
-int device_base_t::write(void) {
+int device_base_t::write(buf_t& _buf) {
     auto res = drv->write(buf);
+
     // 等待中断完成
     while (buf.valid == false) {
         ;
     }
+
+    memcpy(buf.data, _buf.data, COMMON::BUFFFER_SIZE);
+
     buf.valid = false;
+
     return res;
 }
 
diff --git a/src/device/include/device_base.h b/src/device/include/device_base.h
index 67137549c..9c4d46632 100644
--- a/src/device/include/device_base.h
+++ b/src/device/include/device_base.h
@@ -63,13 +63,15 @@ class device_base_t {
 
     /**
      * @brief 从设备读
+     * @param  _buf             缓冲区
      */
-    virtual int          read(void);
+    virtual int          read(buf_t& _buf);
 
     /**
      * @brief 向设备写
+     * @param  _buf             缓冲区
      */
-    virtual int          write(void);
+    virtual int          write(buf_t& _buf);
 
     /**
      * @brief ioctl 控制
diff --git a/src/drv/virtio/virtio_mmio_drv.cpp b/src/drv/virtio/virtio_mmio_drv.cpp
index 3c6aedb60..706f8931b 100644
--- a/src/drv/virtio/virtio_mmio_drv.cpp
+++ b/src/drv/virtio/virtio_mmio_drv.cpp
@@ -277,7 +277,6 @@ int virtio_mmio_drv_t::read(buf_t& _buf) {
     req->sector           = _buf.sector;
     req->data             = _buf.data;
     auto ret              = blk_rw(*req);
-    _buf.valid            = true;
     return ret;
 }
 
@@ -288,7 +287,6 @@ int virtio_mmio_drv_t::write(buf_t& _buf) {
     req->sector           = _buf.sector;
     req->data             = _buf.data;
     auto ret              = blk_rw(*req);
-    _buf.valid            = true;
     return ret;
 }
 
diff --git a/src/drv/virtio/virtio_mmio_intr.cpp b/src/drv/virtio/virtio_mmio_intr.cpp
index 54a800781..59361fb13 100644
--- a/src/drv/virtio/virtio_mmio_intr.cpp
+++ b/src/drv/virtio/virtio_mmio_intr.cpp
@@ -80,8 +80,6 @@ static void virtio_blk_handle_used(device_base_t* _dev, uint32_t _usedidx) {
 
     delete req;
 
-    _dev->buf.valid = true;
-
     drv->queue.free_desc(desc1);
     drv->queue.free_desc(desc2);
     drv->queue.free_desc(desc3);
@@ -106,5 +104,7 @@ void virtio_mmio_intr(uint8_t _no) {
 
     drv->queue.virtq->seen_used = drv->queue.virtq->used->idx % len;
 
+    dev->buf.valid              = true;
+
     return;
 }
diff --git a/src/kernel/dev_drv_manager.cpp b/src/kernel/dev_drv_manager.cpp
index 9a8b6acbd..fb00c32e1 100644
--- a/src/kernel/dev_drv_manager.cpp
+++ b/src/kernel/dev_drv_manager.cpp
@@ -21,11 +21,6 @@
 #include "virtio_dev.h"
 #include "virtio_mmio_drv.h"
 
-void virtio_intr_handler(void) {
-    warn("virtio irq handler.\n");
-    return;
-}
-
 void DEV_DRV_MANAGER::show(void) const {
     info("bus count: 0x%X\n", buss.size());
     for (auto i : buss) {
diff --git a/src/kernel/kernel_main.cpp b/src/kernel/kernel_main.cpp
index 19ba7c019..88971b760 100644
--- a/src/kernel/kernel_main.cpp
+++ b/src/kernel/kernel_main.cpp
@@ -56,12 +56,13 @@ void kernel_main(void) {
     TIMER::get_instance().init();
     // 初始化设备
     DEV_DRV_MANAGER::get_instance().init();
-    // 测试设备
-    test_device();
 
     // 允许中断
     CPU::ENABLE_INTR();
 
+    // 测试设备
+    test_device();
+
     // 显示基本信息
     show_info();
     // 进入死循环
diff --git a/src/kernel/test.cpp b/src/kernel/test.cpp
index ea6e82697..c845d37d5 100644
--- a/src/kernel/test.cpp
+++ b/src/kernel/test.cpp
@@ -235,12 +235,14 @@ int test_device(void) {
     device_base_t* dev
       = (device_base_t*)DEV_DRV_MANAGER::get_instance().get_dev_via_intr_no(1);
 
-    dev->buf.sector = 0;
-    dev->read();
+    buf_t buf;
+    buf.sector = 0;
+
+    dev->read(buf);
 
     // fat 第一个扇区的最后两字节
-    assert(dev->buf.data[COMMON::BUFFFER_SIZE - 1] == 0xAA);
-    assert(dev->buf.data[COMMON::BUFFFER_SIZE - 2] == 0x55);
+    assert(buf.data[COMMON::BUFFFER_SIZE - 1] == 0xAA);
+    assert(buf.data[COMMON::BUFFFER_SIZE - 2] == 0x55);
 
     info("device test done.\n");
     return 0;