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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic concept/concept topic concept" role="article" aria-labelledby="ariaid-title1"><span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/ce/ce-key_procedures.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">关键流程设计</h1><div class="date inPage">7 Jun 2024</div><div style="color: gray;">
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Read time: 3 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><section class="- topic/section section" id="ce_key_procedures__section_hhx_y1y_21c" data-ofbid="ce_key_procedures__section_hhx_y1y_21c"><h2 class="- topic/title title sectiontitle">初始化流程</h2>
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<figure class="- topic/fig fig fignone" id="ce_key_procedures__fig_mcc_1by_21c" data-ofbid="ce_key_procedures__fig_mcc_1by_21c"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="ce_key_procedures__image_ihx_y1y_21c" src="../../../images/ce/ce_keyflow.png" alt="ce_keyflow"/></div><br/><figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 1</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">初始化流程</span></figcaption></figure>
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<div class="- topic/p p" data-ofbid="d72614e34__20250121171523">相关的代码流程如下。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="ce_key_procedures__codeblock_uw1_bby_21c" data-ofbid="ce_key_procedures__codeblock_uw1_bby_21c">aic_crypto_probe(pdev);
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|-> ce_dev->base = devm_platform_ioremap_resource(pdev, <span class="hl-number">0</span>);
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|-> ret = devm_request_threaded_irq(dev, irq, aic_crypto_irq_handler,
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| aic_crypto_irq_thread, IRQF_ONESHOT,
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| dev_name(dev), ce_dev);
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|-> ce_dev->clk = devm_clk_get(dev, NULL);
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|-> clk_prepare_enable(ce_dev->clk);
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|-> ce_dev->reset = devm_reset_control_get(dev, NULL);
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|-> reset_control_assert(ce_dev->reset);
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|-> reset_control_deassert(ce_dev->reset);
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|-> aic_crypto_skcipher_accelerator_init(ce_dev);
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| |-> eng = crypto_engine_alloc_init_and_set(ce->dev, true, NULL, true,
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| | ACCEL_QUEUE_MAX_SIZE);
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| |-> kfifo_alloc(&ce->sk_accel.req_fifo, ACCEL_QUEUE_MAX_SIZE, GFP_KERNEL);
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| |-> crypto_engine_start(ce->sk_accel.engine);
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| |-> crypto_register_skcipher(&sk_algs[i].alg);
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|-> aic_crypto_akcipher_accelerator_init(ce_dev);
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|-> aic_crypto_hash_accelerator_init(ce_dev);</pre></div>
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</section><section class="- topic/section section" id="ce_key_procedures__section_khx_y1y_21c" data-ofbid="ce_key_procedures__section_khx_y1y_21c"><h2 class="- topic/title title sectiontitle">数据处理流程</h2>
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<p class="- topic/p p" data-ofbid="d72614e44__20250121171523">由于 CE 中几种类型算法的数据处理流程相似，这里仅以对称密钥算法的数据处理流程为例进行说明。</p>
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<p class="- topic/p p" data-ofbid="d72614e47__20250121171523">在处理步骤上，各种算法都遵循标准化的几个步骤：</p>
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<ol class="- topic/ol ol" id="ce_key_procedures__ol_mhx_y1y_21c" data-ofbid="ce_key_procedures__ol_mhx_y1y_21c"><li class="- topic/li li" data-ofbid="d72614e51__20250121171523">
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<p class="- topic/p p" data-ofbid="d72614e53__20250121171523">从 Crypto Core 层将处理请求传递给 CE 算法</p>
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</li><li class="- topic/li li" data-ofbid="d72614e56__20250121171523">
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<p class="- topic/p p" data-ofbid="d72614e58__20250121171523">CE 算法处理函数将请求转交给(transfer)给对应加速器的 crypto_engine 队列</p>
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</li><li class="- topic/li li" data-ofbid="d72614e61__20250121171523">
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<p class="- topic/p p" data-ofbid="d72614e63__20250121171523">crypto_engine 中的处理线程从队列中取出请求，调用对应的 prepare/do_one_req 进行处理</p>
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</li><li class="- topic/li li" data-ofbid="d72614e66__20250121171523">
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<p class="- topic/p p" data-ofbid="d72614e68__20250121171523">do_one_req 回调函数中，将对应的请求交给硬件处理</p>
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</li><li class="- topic/li li" data-ofbid="d72614e71__20250121171523">
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<p class="- topic/p p" data-ofbid="d72614e73__20250121171523">在中断处理函数中，取出结果，返回给调用者</p>
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</li></ol>
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<div class="- topic/p p" data-ofbid="d72614e77__20250121171523">对称密钥算法的具体处理调用流程如下所示。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="ce_key_procedures__codeblock_exp_bby_21c" data-ofbid="ce_key_procedures__codeblock_exp_bby_21c">aic_skcipher_aes_ecb_encrypt(req);
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|-> aic_skcipher_crypt(req, FLG_AES | FLG_ECB);
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|-> crypto_transfer_skcipher_request_to_engine(eng, req);
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crypto_engine
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|-> aic_skcipher_prepare_req(engine, req);
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|-> aic_skcipher_do_one_req(engine, req);
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|-> aic_crypto_enqueue_task(ce, algo, rctx->phy_task);
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aic_crypto_irq_thread(<strong class="hl-keyword">int</strong> irq, <strong class="hl-keyword">void</strong> *arg);
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|-> aic_skcipher_handle_irq(ce_dev);
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|-> crypto_finalize_skcipher_request(ce->sk_accel.engine, req, err);
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|-> aic_skcipher_unprepare_req(engine, req);
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|-> req.complete(req, err);</pre></div>
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<p class="- topic/p p" data-ofbid="d72614e83__20250121171523">除了上述的大处理流程，还有一个关键点需要注意，就是 <strong class="+ topic/ph hi-d/b ph b">数据的对齐处理</strong> 。用户发起数据处理请求时， 提供了输入和输出的数据缓冲区，然而这些数据缓冲区对 CE
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而言有两个问题：</p>
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<ol class="- topic/ol ol" id="ce_key_procedures__ol_phx_y1y_21c" data-ofbid="ce_key_procedures__ol_phx_y1y_21c"><li class="- topic/li li" data-ofbid="d72614e90__20250121171523">
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<p class="- topic/p p" data-ofbid="d72614e92__20250121171523">这些缓冲区是虚拟地址空间的内存，并不一定是物理连续的内存空间</p>
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</li><li class="- topic/li li" data-ofbid="d72614e95__20250121171523">
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<p class="- topic/p p" data-ofbid="d72614e97__20250121171523">缓冲区的开始地址并不一定是对齐的，不一定满足 CE 的地址对齐要求</p>
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</li></ol>
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<p class="- topic/p p" data-ofbid="d72614e101__20250121171523">因此需要对输入和输出的数据做一些处理。</p>
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<p class="- topic/p p" data-ofbid="d72614e104__20250121171523">一个简单的处理方式是对输入和输出的数据，一律复制到驱动新申请的物理连续的缓冲区中， 使用该空间作为 CE 的硬件工作缓冲区，处理完成之后再复制到用户提供的输出缓冲区。
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但是对每一笔数据都会有额外的两次数据拷贝操作，对于处理大量数据的应用场景，效率较低。</p>
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<p class="- topic/p p" data-ofbid="d72614e107__20250121171523">为了兼顾数据处理效率，CE 驱动针对可能出现的情况，做了几个分类， <strong class="+ topic/ph hi-d/b ph b">原则上尽量避免数据拷贝</strong> 。</p>
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<ol class="- topic/ol ol" id="ce_key_procedures__ol_rhx_y1y_21c" data-ofbid="ce_key_procedures__ol_rhx_y1y_21c"><li class="- topic/li li" data-ofbid="d72614e114__20250121171523">
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<p class="- topic/p p" data-ofbid="d72614e116__20250121171523">输入缓冲区和输出缓冲区 CE 都无法使用</p>
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<p class="- topic/p p" data-ofbid="d72614e119__20250121171523">此种情况 CE 驱动为输入和输出缓冲区分配物理连续的工作缓冲区，并且需要对输入和输出数据进行复制。</p>
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</li><li class="- topic/li li" data-ofbid="d72614e122__20250121171523">
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<p class="- topic/p p" data-ofbid="d72614e124__20250121171523">输入缓冲区 CE 可用，输出缓冲区 CE 不可用</p>
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<p class="- topic/p p" data-ofbid="d72614e127__20250121171523">此种情况 CE 驱动为输出缓冲区分配物理连续的工作缓冲区，CE 将数据处理完成之后，再复制到用户提供的输出缓冲区。</p>
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</li><li class="- topic/li li" data-ofbid="d72614e130__20250121171523">
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<p class="- topic/p p" data-ofbid="d72614e132__20250121171523">输入缓冲区 CE 不可用，输出缓冲区 CE 可用</p>
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<p class="- topic/p p" data-ofbid="d72614e135__20250121171523">此种情况 CE 驱动为输入缓冲区分配物理连续的工作缓冲区，CE 驱动先将输入数据复制到工作缓冲区， 再启动 CE 处理，直接输出到输出缓冲区。</p>
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</li><li class="- topic/li li" data-ofbid="d72614e138__20250121171523"><p class="- topic/p p" data-ofbid="d72614e139__20250121171523">输入缓冲区和输出缓冲区都是 CE 可用</p><p class="- topic/p p" data-ofbid="d72614e141__20250121171523">此种情况效率最高，CE 直接使用用户提供的输入输出缓冲区。</p><div class="- topic/p p" data-ofbid="d72614e143__20250121171523"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="ce_key_procedures__image_shx_y1y_21c" src="../../../images/ce/ce_data_buffer_for_ce.png" alt="ce_data_buffer_for_ce"/></div><br/></div></li></ol>
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<p class="- topic/p p" data-ofbid="d72614e149__20250121171523">当用户处理大量数据时，为了提高系统的处理效率，应为输入和输出数据申请按页对齐的缓冲区，这样 CE 驱动可以直接使用，避免额外的复制操作。</p>
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</section><section class="- topic/section section" id="ce_key_procedures__section_thx_y1y_21c" data-ofbid="ce_key_procedures__section_thx_y1y_21c"><h2 class="- topic/title title sectiontitle">中断处理流程</h2>
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<p class="- topic/p p" data-ofbid="d72614e157__20250121171523">CE 驱动的中断处理比较简单，采用线程化的 IRQ 处理方式实现。</p>
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<div class="- topic/p p" data-ofbid="d72614e160__20250121171523">当中断发生时，首先在 irq handler 函数中保存当前的 IRQ
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状态寄存器和错误状态寄存器的值。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="ce_key_procedures__codeblock_z5z_cby_21c" data-ofbid="ce_key_procedures__codeblock_z5z_cby_21c"><strong class="hl-keyword">static</strong> irqreturn_t aic_crypto_irq_handler(<strong class="hl-keyword">int</strong> irq, <strong class="hl-keyword">void</strong> *arg)
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{
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<strong class="hl-keyword">struct</strong> aic_crypto_dev *ce_dev = arg;
|
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ce_dev->irq_status = readl(ce_dev->base + CE_REG_ISR);
|
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ce_dev->err_status = readl(ce_dev->base + CE_REG_ERR);
|
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writel(ce_dev->irq_status, ce_dev->base + CE_REG_ISR);
|
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<strong class="hl-keyword">return</strong> IRQ_WAKE_THREAD;
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}</pre></div>
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<div class="- topic/p p" data-ofbid="d72614e165__20250121171523">然后唤醒对应的处理线程，根据中断状态值，调用对应算法加速器的 IRQ
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处理函数。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="ce_key_procedures__codeblock_y32_dby_21c" data-ofbid="ce_key_procedures__codeblock_y32_dby_21c"><strong class="hl-keyword">static</strong> irqreturn_t aic_crypto_irq_thread(<strong class="hl-keyword">int</strong> irq, <strong class="hl-keyword">void</strong> *arg)
|
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{
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<strong class="hl-keyword">struct</strong> aic_crypto_dev *ce_dev = arg;
|
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<strong class="hl-keyword">if</strong> (ce_dev->irq_status & (<span class="hl-number">0x1</span> << DMA_CHAN_SK_ACCELERATOR))
|
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|
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aic_skcipher_handle_irq(ce_dev);
|
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|
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<strong class="hl-keyword">if</strong> (ce_dev->irq_status & (<span class="hl-number">0x1</span> << DMA_CHAN_AK_ACCELERATOR))
|
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|
|
aic_akcipher_handle_irq(ce_dev);
|
|||
|
|
<strong class="hl-keyword">if</strong> (ce_dev->irq_status & (<span class="hl-number">0x1</span> << DMA_CHAN_HASH_ACCELERATOR))
|
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|
|
aic_hash_handle_irq(ce_dev);
|
|||
|
|
<strong class="hl-keyword">return</strong> IRQ_HANDLED;
|
|||
|
|
}</pre></div>
|
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<div class="- topic/p p" data-ofbid="d72614e170__20250121171523">如前面所述，各算法加速器的 IRQ
|
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|
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处理函数只做相关资源的释放，以及请求处理完成的通知。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="ce_key_procedures__codeblock_d5h_dby_21c" data-ofbid="ce_key_procedures__codeblock_d5h_dby_21c">aic_skcipher_handle_irq(ce_dev);
|
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|
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|-> crypto_finalize_skcipher_request(ce->sk_accel.engine, req, err);
|
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|
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|-> aic_skcipher_unprepare_req(engine, req);
|
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|
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|-> req.complete(req, err);</pre></div>
|
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</section></div></article></main></div>
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<div class=" wh_topic_toc "><div class="wh_topic_label">在本页上</div><ul><li class="section-item"><div class="section-title"><a href="#ce_key_procedures__section_hhx_y1y_21c" data-tocid="ce_key_procedures__section_hhx_y1y_21c">初始化流程</a></div></li><li class="section-item"><div class="section-title"><a href="#ce_key_procedures__section_khx_y1y_21c" data-tocid="ce_key_procedures__section_khx_y1y_21c">数据处理流程</a></div></li><li class="section-item"><div class="section-title"><a href="#ce_key_procedures__section_thx_y1y_21c" data-tocid="ce_key_procedures__section_thx_y1y_21c">中断处理流程</a></div></li></ul></div>
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