{"id":16516,"date":"2024-11-18T16:43:36","date_gmt":"2024-11-18T08:43:36","guid":{"rendered":"https:\/\/fwq.ai\/blog\/16516\/"},"modified":"2024-11-18T16:43:36","modified_gmt":"2024-11-18T08:43:36","slug":"risc-v-sifive-u54%e5%86%85%e6%a0%b8-%e4%b8%ad%e6%96%ad%e5%92%8c%e5%bc%82%e5%b8%b8%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/16516\/","title":{"rendered":"RISC-V SiFive 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 \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<ul>\n<li>\n<pre>mret\u6307\u4ee4\u8fdb\u5165\u7528\u6237\u6a21\u5f0f\u3002Note\uff1a\u53ea\u6709\u4e00\u7ec4\u7528\u6237\u5bc4\u5b58\u5668&nbsp;(x1&nbsp;-&nbsp;x31)&nbsp;\u7528\u4e8e\u6240\u6709\u6743\u9650\u7ea7\u522b\uff0c\u56e0\u6b64\u5e94\u7528\u8f6f\u4ef6\u8d1f\u8d23\u5728\u8fdb\u5165\u548c\u9000\u51fa\u4e0d\u540c\u7ea7\u522b\u65f6\u4fdd\u5b58\u548c\u6062\u590d\u72b6\u6001\u3002\u672c\u5730\u4e2d\u65ad&nbsp;\u8f6f\u4ef6\u4e2d\u65ad\uff08\u4e2d\u65ad&nbsp;ID&nbsp;#3\uff09\uff1a\u901a\u8fc7\u5199\u5165\u7279\u5b9a&nbsp;hart&nbsp;\u7684\u5185\u5b58\u6620\u5c04\u4e2d\u65ad\u6302\u8d77\u5bc4\u5b58\u5668&nbsp;msip&nbsp;\u6765\u89e6\u53d1\u3002\u5b9a\u65f6\u5668\u4e2d\u65ad\uff1a\u5f53\u5bc4\u5b58\u5668&nbsp;mtime&nbsp;\u5927\u4e8e\u6216\u7b49\u4e8e\u5bc4\u5b58\u5668&nbsp;mtimecmp&nbsp;\u5e76\u4e14\u4e24\u4e2a\u5bc4\u5b58\u5668\u90fd\u662f&nbsp;CLINT&nbsp;\u5185\u5b58\u6620\u5c04\u7684\u4e00\u90e8\u5206\u65f6\uff0c\u4f1a\u89e6\u53d1\u5b9a\u65f6\u5668\u4e2d\u65ad\uff08\u4e2d\u65ad&nbsp;ID&nbsp;#7\uff09\u3002mtime&nbsp;\u548c&nbsp;mtimecmp&nbsp;\u5bc4\u5b58\u5668\u901a\u5e38\u4ec5\u5728\u673a\u5668\u6a21\u5f0f\u4e0b\u53ef\u7528\uff0c\u9664\u975e&nbsp;PMP&nbsp;\u6388\u4e88\u7528\u6237\u6216\u7ba1\u7406\u5458\u6a21\u5f0f\u8bbf\u95ee\u5b83\u4eec\u6240\u5728\u7684\u5185\u5b58\u6620\u5c04\u533a\u57df\u7684\u6743\u9650\u3002\u5168\u5c40\u4e2d\u65ad\u901a\u5e38\u9996\u5148\u8def\u7531\u5230&nbsp;PLIC\uff0c\u7136\u540e\u4f7f\u7528\u5916\u90e8\u4e2d\u65ad\u8fdb\u5165&nbsp;hart\uff08\u4e2d\u65ad&nbsp;ID&nbsp;#11\uff09\u4e2d\u65ad\u64cd\u4f5c&nbsp;\u5728\u7279\u6743\u6a21\u5f0f&nbsp;m&nbsp;\u5185\uff0c\u5982\u679c\u76f8\u5173\u7684\u5168\u5c40\u4e2d\u65ad\u4f7f\u80fd&nbsp;{ie}&nbsp;\u6e05\u96f6\uff0c\u5219\u5728\u8be5\u7279\u6743\u6a21\u5f0f\u4e0b\u4e0d\u4f1a\u4ea7\u751f\u4efb\u4f55\u4e2d\u65ad\uff0c\u4f46\u66f4\u9ad8\u7279\u6743\u6a21\u5f0f\u4e0b\u7684\u5f85\u51b3\u542f\u7528\u4e2d\u65ad\u5c06\u62a2\u5360\u5f53\u524d\u6267\u884c\u3002\u5982\u679c\u8bbe\u7f6e\u4e86&nbsp;{ie}\uff0c\u5219\u5728\u76f8\u540c\u7279\u6743\u6a21\u5f0f\u4e0b\u5904\u4e8e\u66f4\u9ad8\u4e2d\u65ad\u7ea7\u522b\u7684\u6302\u8d77\u542f\u7528\u4e2d\u65ad\u5c06\u62a2\u5360\u5f53\u524d\u6267\u884c\u5e76\u8fd0\u884c\u66f4\u9ad8\u4e2d\u65ad\u7ea7\u522b\u7684\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u3002\u5f53\u53d1\u751f\u4e2d\u65ad\u6216\u540c\u6b65\u5f02\u5e38\u65f6\uff0c\u4f1a\u4fee\u6539\u7279\u6743\u6a21\u5f0f\u4ee5\u53cd\u6620\u65b0\u7684\u7279\u6743\u6a21\u5f0f\u3002\u5904\u7406\u7a0b\u5e8f\u7279\u6743\u6a21\u5f0f\u7684\u5168\u5c40\u4e2d\u65ad\u4f7f\u80fd\u4f4d\u88ab\u6e05\u9664\u4e2d\u65ad\u8fdb\u5165\u548c\u9000\u51fa\u5f53\u4e2d\u65ad\u53d1\u751f\u65f6\uff1a\u2022&nbsp;mstatus.MIE&nbsp;\u7684\u503c\u88ab\u590d\u5236\u5230mcause.MPIE&nbsp;\u4e2d\uff0c\u7136\u540emstatus.MIE&nbsp;\u88ab\u6e05\u9664\uff0c\u6709\u6548\u5730\u7981\u7528\u4e86\u4e2d\u65ad\u3002\u2022&nbsp;\u4e2d\u65ad\u524d\u7684\u7279\u6743\u6a21\u5f0f\u5728mstatus.MPP&nbsp;\u4e2d\u7f16\u7801\u3002\u2022&nbsp;\u5f53\u524d&nbsp;pc&nbsp;\u88ab\u590d\u5236\u5230&nbsp;mepc&nbsp;\u5bc4\u5b58\u5668\u4e2d\uff0c\u7136\u540e\u5c06&nbsp;pc&nbsp;\u8bbe\u7f6e\u4e3a&nbsp;mtvec&nbsp;\u6307\u5b9a\u7684\u503c\u6b64\u65f6\uff0c\u63a7\u5236\u6743\u79fb\u4ea4\u7ed9\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u4e2d\u7684\u8f6f\u4ef6\uff0c\u5e76\u7981\u7528\u4e2d\u65ad\u3002\u6267\u884c&nbsp;mret&nbsp;\u6307\u4ee4\u65f6\uff0c\u4f1a\u53d1\u751f\u4ee5\u4e0b\u60c5\u51b5\uff1a\u2022&nbsp;\u7279\u6743\u6a21\u5f0f\u8bbe\u7f6e\u4e3a\u5728&nbsp;mstatus.MPP&nbsp;\u4e2d\u7f16\u7801\u7684\u503c\u3002\u2022&nbsp;\u5168\u5c40\u4e2d\u65ad\u4f7f\u80fd&nbsp;mstatus.MIE&nbsp;\u8bbe\u7f6e\u4e3a&nbsp;mcause.MPIE&nbsp;\u7684\u503c\u3002\u2022&nbsp;pc&nbsp;\u8bbe\u7f6e\u4e3amepc&nbsp;\u7684\u503c\u3002\u6b64\u65f6\uff0c\u63a7\u5236\u6743\u4ea4\u7ed9\u8f6f\u4ef6\u3002\u4e2d\u65ad\u63a7\u5236\u548c\u72b6\u6001\u5bc4\u5b58\u5668&nbsp;Machine&nbsp;Status&nbsp;Register&nbsp;(mstatus)mstatus&nbsp;\u5bc4\u5b58\u5668\u8ddf\u8e2a\u5e76\u63a7\u5236&nbsp;hart&nbsp;\u7684\u5f53\u524d\u64cd\u4f5c\u72b6\u6001\uff0c\u5305\u62ec\u662f\u5426\u542f\u7528\u4e2d\u65ad\u3002\u901a\u8fc7\u8bbe\u7f6e&nbsp;mstatus&nbsp;\u4e2d\u7684&nbsp;MIE&nbsp;\u4f4d\u6765\u542f\u7528\u4e2d\u65ad\u3002\u5728\u5199\u5165&nbsp;mstatus.MIE=1&nbsp;\u4e4b\u524d\uff0c\u5efa\u8bae\u5148\u5728&nbsp;mie&nbsp;\u4e2d\u5f00\u542f\u4e2d\u65ad\u3002Machine&nbsp;Trap&nbsp;Vector&nbsp;(mtvec)mtvec&nbsp;\u5bc4\u5b58\u5668\u6709\u4e24\u4e2a\u4e3b\u8981\u529f\u80fd\uff1a\u5b9a\u4e49\u9677\u9631\u5411\u91cf\u7684\u57fa\u5730\u5740\uff0c\u4ee5\u53ca\u8bbe\u7f6e&nbsp;U54\u5185\u6838\u5904\u7406\u4e2d\u65ad\u7684\u6a21\u5f0f\u3002\u5bf9\u4e8e&nbsp;Direct&nbsp;\u548c&nbsp;Vectored&nbsp;\u6a21\u5f0f\uff0c\u4e2d\u65ad\u5904\u7406\u6a21\u5f0f\u5728&nbsp;mtvec&nbsp;\u5bc4\u5b58\u5668\u7684&nbsp;MODE&nbsp;\u5b57\u6bb5\u4e2d\u5b9a\u4e49\u3002mtvec&nbsp;\u5bc4\u5b58\u5668\u5728\u8868&nbsp;86&nbsp;\u4e2d\u63cf\u8ff0\uff0cmtvec.MODE&nbsp;\u5b57\u6bb5\u5728\u8868&nbsp;87&nbsp;\u4e2d\u63cf\u8ff0\u3002Mode&nbsp;Direct\u5728\u76f4\u63a5\u6a21\u5f0f\u4e0b\u64cd\u4f5c\u65f6\uff0c\u6240\u6709\u4e2d\u65ad\u548c\u5f02\u5e38\u90fd\u4f1a\u6355\u83b7\u5230&nbsp;mtvec.BASE&nbsp;\u5730\u5740\u3002\u5728\u9677\u9631\u5904\u7406\u7a0b\u5e8f\u5185\u90e8\uff0c\u8f6f\u4ef6\u5fc5\u987b\u8bfb\u53d6&nbsp;mcause&nbsp;\u5bc4\u5b58\u5668\u4ee5\u786e\u5b9a\u89e6\u53d1\u9677\u9631\u7684\u539f\u56e0\u3002\u5728\u76f4\u63a5\u6a21\u5f0f\u4e0b\u64cd\u4f5c\u65f6\uff0cBASE&nbsp;\u5fc5\u987b\u662f&nbsp;4&nbsp;\u5b57\u8282\u5bf9\u9f50\u7684\u3002Mode&nbsp;Vectored\u5728\u5411\u91cf\u6a21\u5f0f\u4e0b\u8fd0\u884c\u65f6\uff0c\u4e2d\u65ad\u5c06&nbsp;pc&nbsp;\u8bbe\u7f6e\u4e3a&nbsp;mtvec.BASE&nbsp;+&nbsp;4&nbsp;\u00d7&nbsp;\u5f02\u5e38\u4ee3\u7801\uff08mcause.EXCCODE\uff09\u3002\u4f8b\u5982\uff0c\u5982\u679c\u53d1\u751f\u673a\u5668\u5b9a\u65f6\u5668\u4e2d\u65ad\uff0c\u5219\u5c06&nbsp;pc&nbsp;\u8bbe\u7f6e\u4e3a&nbsp;mtvec.BASE&nbsp;+&nbsp;0x1C\u3002\u901a\u5e38\uff0c\u9677\u9631\u5411\u91cf\u8868\u586b\u5145\u6709\u8df3\u8f6c\u6307\u4ee4\uff0c\u4ee5\u5c06\u63a7\u5236\u8f6c\u79fb\u5230\u7279\u5b9a\u4e8e\u4e2d\u65ad\u7684\u9677\u9631\u5904\u7406\u7a0b\u5e8f\u3002\u5728\u5411\u91cf\u4e2d\u65ad\u6a21\u5f0f\u4e0b\uff0cBASE&nbsp;\u5fc5\u987b\u662f&nbsp;256&nbsp;\u5b57\u8282\u5bf9\u9f50\u7684\u3002\u6240\u6709\u673a\u5668\u5916\u90e8\u4e2d\u65ad\uff08\u5168\u5c40\u4e2d\u65ad\uff09\u90fd\u6620\u5c04\u5230\u5f02\u5e38\u4ee3\u7801&nbsp;11\u3002\u56e0\u6b64\uff0c\u5f53\u542f\u7528\u4e2d\u65ad\u5411\u91cf\u65f6\uff0cpc&nbsp;\u8bbe\u7f6e\u4e3a\u4efb\u4f55\u5168\u5c40\u4e2d\u65ad\u7684\u5730\u5740&nbsp;mtvec.BASE&nbsp;+&nbsp;0x2C\u3002Machine&nbsp;Interrupt&nbsp;Enable&nbsp;(mie)\u901a\u8fc7\u8bbe\u7f6e&nbsp;mie&nbsp;\u5bc4\u5b58\u5668\u4e2d\u7684\u76f8\u5e94\u4f4d\u6765\u542f\u7528\u5404\u4e2a\u4e2d\u65ad\u3002Machine&nbsp;Interrupt&nbsp;Pending&nbsp;(mip)\u673a\u5668\u4e2d\u65ad\u6302\u8d77&nbsp;(mip)&nbsp;\u5bc4\u5b58\u5668\u6307\u793a\u5f53\u524d\u54ea\u4e9b\u4e2d\u65ad\u5904\u4e8e\u6302\u8d77\u72b6\u6001\u3002\u7279\u6743\u6a21\u5f0f\u4e2d\u65ad&nbsp;U54\u5185\u6838\u652f\u6301\u6709\u9009\u62e9\u5730\u5c06\u4e2d\u65ad\u548c\u5f02\u5e38\u5b9a\u5411\u5230S\u6a21\u5f0f\u3002\u8be5\u529f\u80fd\u7531\u4e2d\u65ad\u548c\u5f02\u5e38\u59d4\u6258CSR\u5904\u7406\uff1amideleg\u548cmedeleg\u3002S\u6a21\u5f0f\u4e2d\u65ad\u548c\u5f02\u5e38\u53ef\u4ee5\u901a\u8fc7stvec\u3001sip\u3001sie&nbsp;\u548c&nbsp;scause&nbsp;\u7ba1\u7406\u3002\u5728M\u6a21\u5f0f\u4e0b\uff0c\u8f6f\u4ef6\u8fd8\u53ef\u4ee5\u76f4\u63a5\u5199\u5165SIP\u5bc4\u5b58\u5668\uff0c\u4ece\u800c\u6709\u6548\u5730\u5411S\u6a21\u5f0f\u53d1\u9001\u4e2d\u65ad\u3002\u8fd9\u5bf9\u4e8e\u5b9a\u65f6\u5668\u548c\u8f6f\u4ef6\u4e2d\u65ad\u7279\u522b\u6709\u7528\uff0c\u56e0\u4e3a\u53ef\u80fd\u9700\u8981\u5728M\u6a21\u5f0f\u548cS\u6a21\u5f0f\u4e0b\u5904\u7406\u8fd9\u4e9b\u4e2d\u65ad\u3002Delegation&nbsp;Registers&nbsp;(mideleg&nbsp;and&nbsp;medeleg)\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u6240\u6709\u7684trap\u90fd\u5728M\u6a21\u5f0f\u4e0b\u5904\u7406\u3002M\u6a21\u5f0f\u4e0b\u8f6f\u4ef6\u53ef\u4ee5\u901a\u8fc7CSR&nbsp;\u6709\u9009\u62e9\u5730\u5c06\u4e2d\u65ad\u548c\u5f02\u5e38\u59d4\u6258\u7ed9S\u6a21\u5f0f\u3002\u5177\u4f53\u7684\u6620\u5c04\u5982\u8868&nbsp;92&nbsp;\u548c\u8868&nbsp;93&nbsp;\u3002\u6ce8\u610f\uff0c\u672c\u5730\u4e2d\u65ad\u53ef\u4ee5\u59d4\u6258\u7ed9M\u6a21\u5f0f\u3002Supervisor&nbsp;Status&nbsp;Register&nbsp;(sstatus)\u4e0eM\u6a21\u5f0f\u7c7b\u4f3c\uff0cS\u6a21\u5f0f\u6709\u4e00\u4e2a\u5bc4\u5b58\u5668\uff0c\u4e13\u95e8\u7528\u4e8e\u8ddf\u8e2a&nbsp;hart&nbsp;\u7684\u5f53\u524d\u72b6\u6001\uff0c\u79f0\u4e3a&nbsp;sstatus\u3002sstatus&nbsp;\u5b9e\u9645\u4e0a\u662f&nbsp;mstatus&nbsp;\u7684\u53d7\u9650\u89c6\u56fe\uff0c\u56e0\u4e3a\u5bf9&nbsp;sstatus&nbsp;\u6240\u505a\u7684\u66f4\u6539\u53cd\u6620\u5728&nbsp;mstatus&nbsp;\u4e2d\u3002\u901a\u8fc7\u5728&nbsp;sstatus&nbsp;\u4e2d\u8bbe\u7f6e&nbsp;SIE&nbsp;\u4f4d\u5e76\u5728&nbsp;sie&nbsp;\u5bc4\u5b58\u5668\u4e2d\u542f\u7528\u6240\u9700\u7684\u5355\u4e2a\u4e2d\u65ad\u6765\u542f\u7528\u4e2d\u65ad\u3002Supervisor&nbsp;Interrupt&nbsp;Enable&nbsp;Register&nbsp;(sie)\u901a\u8fc7\u5728&nbsp;sie&nbsp;\u5bc4\u5b58\u5668\u4e2d\u8bbe\u7f6e\u9002\u5f53\u7684\u4f4d\u6765\u542f\u7528\u7ba1\u7406\u5458\u4e2d\u65ad\u3002Supervisor&nbsp;Interrupt&nbsp;Pending&nbsp;(sip)S\u6a21\u5f0f\u4e2d\u65ad\u6302\u8d77&nbsp;(sip)&nbsp;\u5bc4\u5b58\u5668\u6307\u793a\u5f53\u524d\u54ea\u4e9b\u4e2d\u65ad\u6302\u8d77\u3002Supervisor&nbsp;Cause&nbsp;Register&nbsp;(scause)\u5f53S\u6a21\u5f0f\u4e0b\u6355\u83b7\u9677\u9631\u65f6\uff0c\u5c06\u5bfc\u81f4\u9677\u9631\u7684\u4e8b\u4ef6\u7684\u4ee3\u7801\u5199\u5165&nbsp;cause\u3002\u5f53\u5bfc\u81f4\u9677\u9631\u7684\u4e8b\u4ef6\u662f\u4e2d\u65ad\u65f6\uff0c\u6700\u9ad8\u6709\u6548\u4f4d\nscause&nbsp;\u8bbe\u7f6e\u4e3a&nbsp;1\uff0c\u6700\u4f4e\u6709\u6548\u4f4d\u8868\u793a\u4e2d\u65ad\u53f7\uff0c\u4f7f\u7528\u4e0e&nbsp;sip&nbsp;\u4e2d\u7684\u4f4d\u7f6e\u76f8\u540c\u7684\u7f16\u7801\u3002\u4f8b\u5982\uff0cS\u6a21\u5f0f\u5b9a\u65f6\u5668\u4e2d\u65ad\u5bfc\u81f4&nbsp;cause&nbsp;\u88ab\u8bbe\u7f6e\u4e3a&nbsp;0x8000_0000_0000_0005\u3002scause&nbsp;\u4e5f\u7528\u4e8e\u6307\u793a\u540c\u6b65\u5f02\u5e38\u7684\u539f\u56e0\uff0c\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0cscause&nbsp;\u7684\u6700\u9ad8\u6709\u6548\u4f4d\u8bbe\u7f6e\u4e3a&nbsp;0\u3002\u6709\u5173\u540c\u6b65\u5f02\u5e38\u4ee3\u7801\u7684\u5217\u8868\uff0c\u8bf7\u53c2\u89c1\u8868&nbsp;98\u3002Supervisor&nbsp;Trap&nbsp;Vector&nbsp;(stvec)\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u6240\u6709\u4e2d\u65ad\u90fd\u4f1a\u6355\u83b7\u5230&nbsp;stvec&nbsp;\u5bc4\u5b58\u5668\u4e2d\u5b9a\u4e49\u7684\u5355\u4e2a\u5730\u5740\u3002\u7531\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u8bfb\u53d6\u539f\u56e0\u5e76\u505a\u51fa\u76f8\u5e94\u7684\u53cd\u5e94\u3002RISC\u2011V&nbsp;\u548c&nbsp;U54&nbsp;\u5185\u6838\u8fd8\u652f\u6301\u9009\u62e9\u6027\u5730\u542f\u7528\u4e2d\u65ad\u5411\u91cf\u7684\u80fd\u529b\u3002\u5f53\u542f\u7528\u5411\u91cf\u65f6\uff0c\u5728&nbsp;sie&nbsp;\u4e2d\u5b9a\u4e49\u7684\u6bcf\u4e2a\u4e2d\u65ad\u90fd\u4f1a\u9677\u5165\u5230\u5b83\u81ea\u5df1\u7684\u7279\u5b9a\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u4e2d\u3002\u5f53&nbsp;stvec&nbsp;\u5bc4\u5b58\u5668\u7684&nbsp;MODE&nbsp;\u5b57\u6bb5\u8bbe\u7f6e\u4e3a&nbsp;1&nbsp;\u65f6\uff0c\u5411\u91cf\u4e2d\u65ad\u88ab\u542f\u7528\u3002\u5982\u679c\u5411\u91cf\u4e2d\u65ad\u88ab\u7981\u7528&nbsp;(stvec.MODE=0)\uff0c\u6240\u6709\u4e2d\u65ad\u90fd\u4f1a\u9677\u5165&nbsp;stvec.BASE&nbsp;\u5730\u5740\u3002\u5982\u679c\u542f\u7528\u77e2\u91cf\u4e2d\u65ad&nbsp;(stvec.MODE=1)\uff0c\u4e2d\u65ad\u5c06&nbsp;pc&nbsp;\u8bbe\u7f6e\u4e3a&nbsp;stvec.BASE&nbsp;+&nbsp;4&nbsp;\u00d7&nbsp;\u5f02\u5e38\u4ee3\u7801&nbsp;(scause.EXCCODE)\u3002\u4f8b\u5982\uff0c\u5982\u679c\u53d1\u751f\u7ba1\u7406\u5b9a\u65f6\u5668\u4e2d\u65ad\uff0c\u5219&nbsp;pc&nbsp;\u8bbe\u7f6e\u4e3a&nbsp;stvec.BASE&nbsp;+&nbsp;0x14\u3002\u901a\u5e38\uff0c\u9677\u9631\u5411\u91cf\u8868\u4e2d\u586b\u5145\u6709\u8df3\u8f6c\u6307\u4ee4\uff0c\u4ee5\u5c06\u63a7\u5236\u8f6c\u79fb\u5230\u7279\u5b9a\u4e8e\u4e2d\u65ad\u7684\u9677\u9631\u5904\u7406\u7a0b\u5e8f\u3002\u5728\u5411\u91cf\u4e2d\u65ad\u6a21\u5f0f\u4e0b\uff0cBASE&nbsp;\u5fc5\u987b\u662f&nbsp;128&nbsp;\u5b57\u8282\u5bf9\u9f50\u7684\u3002\u6240\u6709\u4e3b\u7ba1\u5916\u90e8\u4e2d\u65ad\uff08\u5168\u5c40\u4e2d\u65ad\uff09\u90fd\u6620\u5c04\u5230\u5f02\u5e38\u4ee3\u7801&nbsp;9\u3002\u56e0\u6b64\uff0c\u5f53\u542f\u7528\u4e2d\u65ad\u5411\u91cf\u65f6\uff0cpc&nbsp;\u88ab\u8bbe\u7f6e\u4e3a\u4efb\u4f55\u5168\u5c40\u4e2d\u65ad\u7684\u5730\u5740&nbsp;stvec.BASE&nbsp;+&nbsp;0x24\u3002Delegated&nbsp;Interrupt&nbsp;Handling\u63a5\u53d7\u59d4\u6d3e\u9677\u9631\u540e\uff0c\u4f1a\u53d1\u751f\u4ee5\u4e0b\u60c5\u51b5\uff1asstatus.SIE&nbsp;\u7684\u503c\u88ab\u590d\u5236\u5230&nbsp;sstatus.SPIE\uff0c\u7136\u540e&nbsp;sstatus.SIE&nbsp;\u88ab\u6e05\u9664\uff0c\u6709\u6548\u5730\u7981\u7528\u4e2d\u65ad\u3002\u5f53\u524dpc\u88ab\u590d\u5236\u5230sepc\u5bc4\u5b58\u5668\u4e2d\uff0c\u7136\u540epc\u88ab\u8bbe\u7f6e\u4e3astvec\u7684\u503c\u3002\u5728\u542f\u7528\u77e2\u91cf\u4e2d\u65ad\u7684\u60c5\u51b5\u4e0b\uff0cpc&nbsp;\u8bbe\u7f6e\u4e3a&nbsp;stvec.BASE&nbsp;+&nbsp;4&nbsp;\u00d7&nbsp;\u5f02\u5e38\u4ee3\u7801&nbsp;(scause.EXCCODE)\u3002\u4e2d\u65ad\u524d\u7684\u7279\u6743\u6a21\u5f0f\u7f16\u7801\u5728&nbsp;sstatus.SPP&nbsp;\u4e2d\u6b64\u65f6\uff0c\u63a7\u5236\u6743\u79fb\u4ea4\u7ed9\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u4e2d\u7684\u8f6f\u4ef6\uff0c\u4e2d\u65ad\u88ab\u7981\u7528\u3002\u53ef\u4ee5\u901a\u8fc7\u663e\u5f0f\u8bbe\u7f6e&nbsp;sstatus.SIE&nbsp;\u6216\u6267\u884c&nbsp;SRET&nbsp;\u6307\u4ee4\u9000\u51fa\u5904\u7406\u7a0b\u5e8f\u6765\u91cd\u65b0\u542f\u7528\u4e2d\u65ad\u3002\u6267\u884c&nbsp;SRET&nbsp;\u6307\u4ee4\u65f6\uff0c\u4f1a\u53d1\u751f\u4ee5\u4e0b\u60c5\u51b5\uff1a\u7279\u6743\u6a21\u5f0f\u8bbe\u7f6e\u4e3a&nbsp;sstatus.SPP&nbsp;\u4e2d\u7f16\u7801\u7684\u503cstatus.SPIE&nbsp;\u7684\u503c\u88ab\u590d\u5236\u5230&nbsp;status.SIE<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236  <\/li>\n<li>  pc \u8bbe\u7f6e\u4e3a sepc \u7684\u503c <\/li>\n<\/ul>\n<p style=\"padding-top: 8px;padding-bottom: 8px;line-height: 26px\">\u6b64\u65f6\uff0c\u63a7\u5236\u6743\u4ea4\u7ed9\u4e86\u8f6f\u4ef6<\/p>\n<h2> <span style=\"padding: 2px 10px 1px;border-top-right-radius: 3px;border-top-left-radius: 3px;margin-right: 3px\">\u4e2d\u65ad\u5ef6\u8fdf<\/span><span style=\"vertical-align: bottom;border-bottom: 36px solid #efebe9;border-right: 20px solid transparent\"> <\/span> <\/h2>\n<p style=\"padding-top: 8px;padding-bottom: 8px;line-height: 26px\"><strong>U54\u5185\u6838\u7684\u4e2d\u65ad\u5ef6\u8fdf\u4e3a\u56db\u4e2a external_source_for_core_N_clock \u5468\u671f<\/strong>\uff0c\u8ba1\u7b97\u65b9\u5f0f\u662f\u4ece\u5411 hart \u53d1\u9001\u4e2d\u65ad\u4fe1\u53f7\u5230\u5904\u7406\u7a0b\u5e8f\u7684\u7b2c\u4e00\u4e2a\u6307\u4ee4\u83b7\u53d6\u6240\u9700\u7684\u5468\u671f\u6570\u3002<\/p>\n<p style=\"padding-top: 8px;padding-bottom: 8px;line-height: 26px\">\u901a\u8fc7 PLIC \u8def\u7531\u7684\u5168\u5c40\u4e2d\u65ad\u4f1a\u5bfc\u81f4\u4e09\u4e2a\u65f6\u949f\u5468\u671f\u7684\u989d\u5916\u5ef6\u8fdf\uff0c\u5176\u4e2d PLIC \u7531\u65f6\u949f\u8ba1\u65f6\u3002\u8fd9\u610f\u5473\u7740\u5168\u5c40\u4e2d\u65ad\u7684\u603b\u5ef6\u8fdf\uff08\u4ee5\u5468\u671f\u4e3a\u5355\u4f4d\uff09\u4e3a\uff1a4 + 3 \u00d7 (external_source_for_core_N_clock Hz \u00f7 clock Hz)\u3002\u8fd9\u662f\u6700\u4f73\u60c5\u51b5\u4e0b\u7684\u5faa\u73af\u8ba1\u6570\uff0c\u5e76\u5047\u5b9a\u5904\u7406\u7a0b\u5e8f\u5df2\u7f13\u5b58\u3002\u5b83\u6ca1\u6709\u8003\u8651\u6765\u81ea\u5916\u56f4\u6e90\u7684\u989d\u5916\u5ef6\u8fdf<\/p>\n<h2> <span style=\"padding: 2px 10px 1px;border-top-right-radius: 3px;border-top-left-radius: 3px;margin-right: 3px\">\u4e0d\u53ef\u5c4f\u853d\u4e2d\u65ad<\/span><span style=\"vertical-align: bottom;border-bottom: 36px solid #efebe9;border-right: 20px solid transparent\"> <\/span> <\/h2>\n<p style=\"padding-top: 8px;padding-bottom: 8px;line-height: 26px\">rnmi\uff08\u53ef\u6062\u590d\u4e0d\u53ef\u5c4f\u853d\u4e2d\u65ad\uff09\u4e2d\u65ad\u4fe1\u53f7\u662f hart \u7684\u7535\u5e73\u654f\u611f\u8f93\u5165\u3002\u4e0d\u53ef\u5c4f\u853d\u4e2d\u65ad\u6bd4 hart \u4e0a\u7684\u4efb\u4f55\u5176\u4ed6\u4e2d\u65ad\u6216\u5f02\u5e38\u5177\u6709\u66f4\u9ad8\u7684\u4f18\u5148\u7ea7\uff0c\u5e76\u4e14\u4e0d\u80fd\u88ab\u8f6f\u4ef6\u7981\u7528\u3002\u5177\u4f53\u6765\u8bf4\uff0c\u5b83\u4eec\u4e0d\u4f1a\u901a\u8fc7\u6e05\u9664 mstatus.mie \u5bc4\u5b58\u5668\u6765\u7981\u7528\u3002<\/p>\n<h3>Handler Addresses<\/h3>\n<p style=\"padding-top: 8px;padding-bottom: 8px;line-height: 26px\">NMI \u6709\u4e00\u4e2a\u5173\u8054\u7684\u5f02\u5e38\u9677\u9631\u5904\u7406\u7a0b\u5e8f\u5730\u5740\u3002\u8be5\u5730\u5740\u7531\u5916\u90e8\u8f93\u5165\u4fe1\u53f7\u8bbe\u7f6e\u3002<\/p>\n<h3>RNMI CSRs<\/h3>\n<p style=\"padding-top: 8px;padding-bottom: 8px;line-height: 26px\">\u8fd9\u4e9b M \u6a21\u5f0f CSR \u542f\u7528\u53ef\u6062\u590d\u975e\u5c4f\u853d\u4e2d\u65ad (RNMI)\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/001\/275\/014\/607a6bb8ffd9957ceed8595503dac893-0.png\" class=\"aligncenter\" title=\"RISC-V SiFive U54\u5185\u6838\u2014\u2014\u4e2d\u65ad\u548c\u5f02\u5e38\u8be6\u89e3\u63d2\u56fe\" alt=\"RISC-V SiFive U54\u5185\u6838\u2014\u2014\u4e2d\u65ad\u548c\u5f02\u5e38\u8be6\u89e3\u63d2\u56fe\" \/>  <\/p>\n<ul>\n<li>  mnscratch CSR \u62e5\u6709\u4e00\u4e2a 64 \u4f4d\u8bfb\u5199\u5bc4\u5b58\u5668\uff0c\u5b83\u4f7f NMI \u9677\u9631\u5904\u7406\u7a0b\u5e8f\u80fd\u591f\u4fdd\u5b58\u548c\u6062\u590d\u88ab\u4e2d\u65ad\u7684\u4e0a\u4e0b\u6587\u3002 <\/li>\n<li>  mnepc CSR \u662f\u4e00\u4e2a 64 \u4f4d\u8bfb\u5199\u5bc4\u5b58\u5668\uff0c\u5728\u8fdb\u5165 NMI \u9677\u9631\u5904\u7406\u7a0b\u5e8f\u65f6\uff0c\u5b83\u4fdd\u5b58\u63a5\u53d7\u4e2d\u65ad\u7684\u6307\u4ee4\u7684 PC\u3002mnepc \u7684\u6700\u4f4e\u4f4d\u786c\u8fde\u7ebf\u4e3a\u96f6\u3002 <\/li>\n<li>  mncause CSR \u5305\u542b NMI \u7684\u539f\u56e0\uff0c\u7b2c 63 \u4f4d\u8bbe\u7f6e\u4e3a 1\uff0c\u5e76\u4e14 NMI \u539f\u56e0\u7f16\u7801\u5728\u6700\u4f4e\u6709\u6548\u4f4d\u4e2d\uff0c\u5982\u679c\u4e0d\u652f\u6301 NMI \u539f\u56e0\uff0c\u5219\u4e3a\u96f6\u3002mncause \u7684\u4f4e\u4f4d\uff0c\u5b9a\u4e49\u4e3a exception_code\uff0c\u5982\u4e0b\uff1a <\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/001\/275\/014\/607a6bb8ffd9957ceed8595503dac893-1.png\" class=\"aligncenter\" title=\"RISC-V SiFive U54\u5185\u6838\u2014\u2014\u4e2d\u65ad\u548c\u5f02\u5e38\u8be6\u89e3\u63d2\u56fe1\" alt=\"RISC-V SiFive U54\u5185\u6838\u2014\u2014\u4e2d\u65ad\u548c\u5f02\u5e38\u8be6\u89e3\u63d2\u56fe1\" \/>  <\/p>\n<ul>\n<li>  mnstatus CSR \u5305\u542b\u4e00\u4e2a\u4e24\u4f4d\u5b57\u6bb5\uff0c\u5728\u8fdb\u5165\u9677\u9631\u5904\u7406\u7a0b\u5e8f\u65f6\uff0c\u5b83\u5305\u542b\u4ee5\u4e0e mstatus.mpp \u76f8\u540c\u7684\u65b9\u5f0f\u7f16\u7801\u7684\u4e2d\u65ad\u4e0a\u4e0b\u6587\u7684\u7279\u6743\u6a21\u5f0f <\/li>\n<\/ul>\n<h3>MNRET Instruction<\/h3>\n<p style=\"padding-top: 8px;padding-bottom: 8px;line-height: 26px\">\u6b64\u4ec5 M \u6a21\u5f0f\u6307\u4ee4\u4f7f\u7528 mnepc \u548c mnstatus \u4e2d\u7684\u503c\u5206\u522b\u8fd4\u56de\u4e2d\u65ad\u4e0a\u4e0b\u6587\u7684\u7a0b\u5e8f\u8ba1\u6570\u5668\u548c\u7279\u6743\u6a21\u5f0f\u3002\u8be5\u6307\u4ee4\u8fd8\u8bbe\u7f6e\u5185\u90e8 rnmie \u72b6\u6001\u4f4d\u3002<\/p>\n<p style=\"padding-top: 8px;padding-bottom: 8px;line-height: 26px\">\u7f16\u7801\u4e0e MRET \u76f8\u540c\uff0c\u9664\u4e86\u7b2c 30 \u4f4d\u8bbe\u7f6e\uff08\u5373 funct7=0111000\uff09\u3002\u4f8b\u5982\uff1a<\/p>\n<pre>.word&nbsp;0x70200073&nbsp;\/\/&nbsp;opcode&nbsp;for&nbsp;MNRET&nbsp;(return&nbsp;from&nbsp;RNMI)<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<h3>RNMI Operation<\/h3>\n<p style=\"padding-top: 8px;padding-bottom: 8px;line-height: 26px\">\u5f53\u68c0\u6d4b\u5230RNMI\u4e2d\u65ad\u65f6\uff0c\u5c06\u4e2d\u65ad\u7684PC\u5199\u5165mnepc CSR\uff0cRNMI\u7684\u7c7b\u578b\u5199\u5165mncause CSR\uff0c\u4e2d\u65ad\u4e0a\u4e0b\u6587\u7684\u7279\u6743\u6a21\u5f0f\u5199\u5165mnstatus CSR\u3002\u5185\u90e8\u5fae\u4f53\u7cfb\u7ed3\u6784\u72b6\u6001\u4f4d rnmie \u88ab\u6e05\u9664\u4ee5\u6307\u793a\u5904\u7406\u5668\u5904\u4e8e RNMI \u5904\u7406\u7a0b\u5e8f\u4e2d\u5e76\u4e14\u4e0d\u80fd\u63a5\u53d7\u65b0\u7684 RNMI \u4e2d\u65ad\u3002\u6e05\u9664\u65f6\uff0c\u5185\u90e8 rnmie \u4f4d\u8fd8\u4f1a\u7981\u7528\u6240\u6709\u5176\u4ed6\u4e2d\u65ad<\/p>\n<blockquote style=\"border-top: none;border-right: none;border-bottom: none;font-size: 0.9em;overflow: auto;padding: 10px 10px 10px 20px;margin-bottom: 20px;margin-top: 20px\">\n<p style=\"font-size: 16px;padding-top: 8px;padding-bottom: 8px;color: black;line-height: 26px\">\u8fd9\u4e9b\u4e2d\u65ad\u88ab\u79f0\u4e3a\u4e0d\u53ef\u5c4f\u853d\u7684\uff0c\u56e0\u4e3a\u8f6f\u4ef6\u65e0\u6cd5\u5c4f\u853d\u4e2d\u65ad\u3002\u4f46\u662f\uff0c\u4e3a\u4e86\u6b63\u786e\u64cd\u4f5c\uff0c\u5fc5\u987b\u63a8\u8fdf\u540c\u4e00\u4e2d\u65ad\u7684\u5176\u4ed6\u5b9e\u4f8b\uff0c\u76f4\u5230\u5904\u7406\u7a0b\u5e8f\u5b8c\u6210\uff0c\u56e0\u6b64\u5185\u90e8\u72b6\u6001\u4f4d<\/p>\n<\/blockquote>\n<p style=\"padding-top: 8px;padding-bottom: 8px;line-height: 26px\">RNMI \u5904\u7406\u7a0b\u5e8f\u53ef\u4ee5\u4f7f\u7528 MNRET \u6307\u4ee4\uff08\u5728\u7b2c 7.11.3 \u8282\u4e2d\u63cf\u8ff0\uff09\u6062\u590d\u539f\u59cb\u6267\u884c\uff0c\u8be5\u6307\u4ee4\u4ece mnepc \u6062\u590d PC\uff0c\u4ece mnstatus \u6062\u590d\u7279\u6743\u6a21\u5f0f\uff0c\u5e76\u8bbe\u7f6e\u5185\u90e8 rnmie \u72b6\u6001\u4f4d\uff0c\u91cd\u65b0\u542f\u7528\u5176\u4ed6\u4e2d\u65ad\u3002<\/p>\n<p style=\"padding-top: 8px;padding-bottom: 8px;line-height: 26px\">\u5982\u679chart\u5728rnmie\u4f4d\u6e05\u96f6\u65f6\u9047\u5230\u5f02\u5e38\uff0c\u5219\u5c06\u5f02\u5e38\u72b6\u6001\u5199\u5165mepc\u548cmcause\uff0cmstatus.mpp\u8bbe\u7f6e\u4e3aM-mode\uff0chart\u8df3\u8f6c\u5230RNMI\u5f02\u5e38\u5904\u7406\u7a0b\u5e8f\u5730\u5740\u3002<\/p>\n<blockquote style=\"border-top: none;border-right: none;border-bottom: none;font-size: 0.9em;overflow: auto;padding: 10px 10px 10px 20px;margin-bottom: 20px;margin-top: 20px\">\n<p style=\"font-size: 16px;padding-top: 8px;padding-bottom: 8px;color: black;line-height: 26px\">RNMI \u5904\u7406\u7a0b\u5e8f\u4e2d\u7684\u9677\u9631\u53ea\u6709\u5728\u5904\u7406\u7a0b\u5e8f\u6b63\u5728\u670d\u52a1\u53d1\u751f\u5728\u673a\u5668\u6a21\u5f0f\u4e4b\u5916\u7684\u4e2d\u65ad\u65f6\u53d1\u751f\u65f6\u624d\u80fd\u6062\u590d\u3002<\/p>\n<\/blockquote>\n<p>\u4ee5\u4e0a\u5c31\u662fRISC-V SiFive U54\u5185\u6838\u2014\u2014\u4e2d\u65ad\u548c\u5f02\u5e38\u8be6\u89e3\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>mstatus.MIE&nbsp;\u5199\u5165&nbsp;0\uff08\u9ed8\u8ba4\u590d\u4f4d\u503c\uff09\u6765\u5168\u5c40\u7981\u7528\u4e2d\u65ad\u3002\u5c06\u673a\u5668\u6a21\u5f0f\u5f02\u5e38\u5904\u7406\u7a0b\u5e8f\u7684\u57fa\u5730\u5740\u5199\u5165&nbsp;mtvec&nbsp;CSR\u3002\u8fd9\u662f\u4efb\u4f55\u5f15\u5bfc\u6d41\u7a0b\u4e2d\u7684\u5fc5\u9700\u6b65\u9aa4\u3002\u5c06&nbsp;mstatus.MPP&nbsp;\u5199\u5165&nbsp;0&nbsp;\u4ee5\u5c06\u4e4b\u524d\u7684\u6a21\u5f0f\u8bbe\u7f6e\u4e3a&nbsp;User\uff0c\u8fd9\u5141\u8bb8\u6211\u4eec\u8fd4\u56de\u5230\u8be5\u6a21\u5f0f\u3002\u8bbe\u7f6e\u7269\u7406\u5185\u5b58\u4fdd\u62a4&nbsp;(PMP)&nbsp;\u533a\u57df\u4ee5\u5c06\u6240\u9700\u533a\u57df\u6388\u4e88\u7528\u6237\u548c\u4e3b\u7ba1\u6a21\u5f0f\uff0c\u5e76\u53ef\u9009\u62e9\u4ece\u673a\u5668\u6a21\u5f0f\u64a4\u6d88\u6743\u9650\u3002\u7528\u4e3b\u7ba1\u6a21\u5f0f\u5f02\u5e38\u5904\u7406\u7a0b\u5e8f\u7684\u57fa\u5730\u5740\u5199\u5165&nbsp;stvec&nbsp;CSR\u3002\u7f16\u5199&nbsp;medeleg&nbsp;\u5bc4\u5b58\u5668\uff0c\u5c06\u5f02\u5e38\u59d4\u6258\u7ed9\u4e3b\u7ba1\u6a21\u5f0f\u3002\u8003\u8651&nbsp;ECALL&nbsp;\u548c\u9875\u9762\u9519\u8bef\u5f02\u5e38\u3002\u7f16\u5199&nbsp;mstatus.FS&nbsp;\u4ee5\u542f\u7528\u6d6e\u70b9\uff08\u5982\u679c\u652f\u6301\uff09\u3002\u5c06\u673a\u5668\u6a21\u5f0f\u7528\u6237\u5bc4\u5b58\u5668\u5b58\u50a8\u5230\u5806\u6808\u6216\u5e94\u7528\u7a0b\u5e8f\u7279\u5b9a\u7684\u5e27\u6307\u9488\u3002\u7528\u7528\u6237\u6001\u8f6f\u4ef6\u7684\u5165\u53e3\u70b9\u7f16\u5199mepc \u767b\u5f55\u540e\u590d\u5236 mret\u6307\u4ee4\u8fdb\u5165\u7528\u6237\u6a21\u5f0f\u3002Note\uff1a\u53ea\u6709\u4e00\u7ec4\u7528\u6237\u5bc4\u5b58\u5668&nbsp;(x1&nbsp;&#8211;&nbsp;x31)&nbsp;\u7528\u4e8e\u6240\u6709\u6743\u9650\u7ea7\u522b\uff0c\u56e0\u6b64\u5e94\u7528\u8f6f\u4ef6\u8d1f\u8d23\u5728\u8fdb\u5165\u548c\u9000\u51fa\u4e0d\u540c\u7ea7\u522b\u65f6\u4fdd\u5b58\u548c\u6062\u590d\u72b6\u6001\u3002\u672c\u5730\u4e2d\u65ad&nbsp;\u8f6f\u4ef6\u4e2d\u65ad\uff08\u4e2d\u65ad&nbsp;ID&nbsp;#3\uff09\uff1a\u901a\u8fc7\u5199\u5165\u7279\u5b9a&nbsp;hart&nbsp;\u7684\u5185\u5b58\u6620\u5c04\u4e2d\u65ad\u6302\u8d77\u5bc4\u5b58\u5668&nbsp;msip&nbsp;\u6765\u89e6\u53d1\u3002\u5b9a\u65f6\u5668\u4e2d\u65ad\uff1a\u5f53\u5bc4\u5b58\u5668&nbsp;mtime&nbsp;\u5927\u4e8e\u6216\u7b49\u4e8e\u5bc4\u5b58\u5668&nbsp;mtimecmp&nbsp;\u5e76\u4e14\u4e24\u4e2a\u5bc4\u5b58\u5668\u90fd\u662f&nbsp;CLINT&nbsp;\u5185\u5b58\u6620\u5c04\u7684\u4e00\u90e8\u5206\u65f6\uff0c\u4f1a\u89e6\u53d1\u5b9a\u65f6\u5668\u4e2d\u65ad\uff08\u4e2d\u65ad&nbsp;ID&nbsp;#7\uff09\u3002mtime&nbsp;\u548c&nbsp;mtimecmp&nbsp;\u5bc4\u5b58\u5668\u901a\u5e38\u4ec5\u5728\u673a\u5668\u6a21\u5f0f\u4e0b\u53ef\u7528\uff0c\u9664\u975e&nbsp;PMP&nbsp;\u6388\u4e88\u7528\u6237\u6216\u7ba1\u7406\u5458\u6a21\u5f0f\u8bbf\u95ee\u5b83\u4eec\u6240\u5728\u7684\u5185\u5b58\u6620\u5c04\u533a\u57df\u7684\u6743\u9650\u3002\u5168\u5c40\u4e2d\u65ad\u901a\u5e38\u9996\u5148\u8def\u7531\u5230&nbsp;PLIC\uff0c\u7136\u540e\u4f7f\u7528\u5916\u90e8\u4e2d\u65ad\u8fdb\u5165&nbsp;hart\uff08\u4e2d\u65ad&nbsp;ID&nbsp;#11\uff09\u4e2d\u65ad\u64cd\u4f5c&nbsp;\u5728\u7279\u6743\u6a21\u5f0f&nbsp;m&nbsp;\u5185\uff0c\u5982\u679c\u76f8\u5173\u7684\u5168\u5c40\u4e2d\u65ad\u4f7f\u80fd&nbsp;{ie}&nbsp;\u6e05\u96f6\uff0c\u5219\u5728\u8be5\u7279\u6743\u6a21\u5f0f\u4e0b\u4e0d\u4f1a\u4ea7\u751f\u4efb\u4f55\u4e2d\u65ad\uff0c\u4f46\u66f4\u9ad8\u7279\u6743\u6a21\u5f0f\u4e0b\u7684\u5f85\u51b3\u542f\u7528\u4e2d\u65ad\u5c06\u62a2\u5360\u5f53\u524d\u6267\u884c\u3002\u5982\u679c\u8bbe\u7f6e\u4e86&nbsp;{ie}\uff0c\u5219\u5728\u76f8\u540c\u7279\u6743\u6a21\u5f0f\u4e0b\u5904\u4e8e\u66f4\u9ad8\u4e2d\u65ad\u7ea7\u522b\u7684\u6302\u8d77\u542f\u7528\u4e2d\u65ad\u5c06\u62a2\u5360\u5f53\u524d\u6267\u884c\u5e76\u8fd0\u884c\u66f4\u9ad8\u4e2d\u65ad\u7ea7\u522b\u7684\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u3002\u5f53\u53d1\u751f\u4e2d\u65ad\u6216\u540c\u6b65\u5f02\u5e38\u65f6\uff0c\u4f1a\u4fee\u6539\u7279\u6743\u6a21\u5f0f\u4ee5\u53cd\u6620\u65b0\u7684\u7279\u6743\u6a21\u5f0f\u3002\u5904\u7406\u7a0b\u5e8f\u7279\u6743\u6a21\u5f0f\u7684\u5168\u5c40\u4e2d\u65ad\u4f7f\u80fd\u4f4d\u88ab\u6e05\u9664\u4e2d\u65ad\u8fdb\u5165\u548c\u9000\u51fa\u5f53\u4e2d\u65ad\u53d1\u751f\u65f6\uff1a\u2022&nbsp;mstatus.MIE&nbsp;\u7684\u503c\u88ab\u590d\u5236\u5230mcause.MPIE&nbsp;\u4e2d\uff0c\u7136\u540emstatus.MIE&nbsp;\u88ab\u6e05\u9664\uff0c\u6709\u6548\u5730\u7981\u7528\u4e86\u4e2d\u65ad\u3002\u2022&nbsp;\u4e2d\u65ad\u524d\u7684\u7279\u6743\u6a21\u5f0f\u5728mstatus.MPP&nbsp;\u4e2d\u7f16\u7801\u3002\u2022&nbsp;\u5f53\u524d&nbsp;pc&nbsp;\u88ab\u590d\u5236\u5230&nbsp;mepc&nbsp;\u5bc4\u5b58\u5668\u4e2d\uff0c\u7136\u540e\u5c06&nbsp;pc&nbsp;\u8bbe\u7f6e\u4e3a&nbsp;mtvec&nbsp;\u6307\u5b9a\u7684\u503c\u6b64\u65f6\uff0c\u63a7\u5236\u6743\u79fb\u4ea4\u7ed9\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u4e2d\u7684\u8f6f\u4ef6\uff0c\u5e76\u7981\u7528\u4e2d\u65ad\u3002\u6267\u884c&nbsp;mret&nbsp;\u6307\u4ee4\u65f6\uff0c\u4f1a\u53d1\u751f\u4ee5\u4e0b\u60c5\u51b5\uff1a\u2022&nbsp;\u7279\u6743\u6a21\u5f0f\u8bbe\u7f6e\u4e3a\u5728&nbsp;mstatus.MPP&nbsp;\u4e2d\u7f16\u7801\u7684\u503c\u3002\u2022&nbsp;\u5168\u5c40\u4e2d\u65ad\u4f7f\u80fd&nbsp;mstatus.MIE&nbsp;\u8bbe\u7f6e\u4e3a&nbsp;mcause.MPIE&nbsp;\u7684\u503c\u3002\u2022&nbsp;pc&nbsp;\u8bbe\u7f6e\u4e3amepc&nbsp;\u7684\u503c\u3002\u6b64\u65f6\uff0c\u63a7\u5236\u6743\u4ea4\u7ed9\u8f6f\u4ef6\u3002\u4e2d\u65ad\u63a7\u5236\u548c\u72b6\u6001\u5bc4\u5b58\u5668&nbsp;Machine&nbsp;Status&nbsp;Register&nbsp;(mstatus)mstatus&nbsp;\u5bc4\u5b58\u5668\u8ddf\u8e2a\u5e76\u63a7\u5236&nbsp;hart&nbsp;\u7684\u5f53\u524d\u64cd\u4f5c\u72b6\u6001\uff0c\u5305\u62ec\u662f\u5426\u542f\u7528\u4e2d\u65ad\u3002\u901a\u8fc7\u8bbe\u7f6e&nbsp;mstatus&nbsp;\u4e2d\u7684&nbsp;MIE&nbsp;\u4f4d\u6765\u542f\u7528\u4e2d\u65ad\u3002\u5728\u5199\u5165&nbsp;mstatus.MIE=1&nbsp;\u4e4b\u524d\uff0c\u5efa\u8bae\u5148\u5728&nbsp;mie&nbsp;\u4e2d\u5f00\u542f\u4e2d\u65ad\u3002Machine&nbsp;Trap&nbsp;Vector&nbsp;(mtvec)mtvec&nbsp;\u5bc4\u5b58\u5668\u6709\u4e24\u4e2a\u4e3b\u8981\u529f\u80fd\uff1a\u5b9a\u4e49\u9677\u9631\u5411\u91cf\u7684\u57fa\u5730\u5740\uff0c\u4ee5\u53ca\u8bbe\u7f6e&nbsp;U54\u5185\u6838\u5904\u7406\u4e2d\u65ad\u7684\u6a21\u5f0f\u3002\u5bf9\u4e8e&nbsp;Direct&nbsp;\u548c&nbsp;Vectored&nbsp;\u6a21\u5f0f\uff0c\u4e2d\u65ad\u5904\u7406\u6a21\u5f0f\u5728&nbsp;mtvec&nbsp;\u5bc4\u5b58\u5668\u7684&nbsp;MODE&nbsp;\u5b57\u6bb5\u4e2d\u5b9a\u4e49\u3002mtvec&nbsp;\u5bc4\u5b58\u5668\u5728\u8868&nbsp;86&nbsp;\u4e2d\u63cf\u8ff0\uff0cmtvec.MODE&nbsp;\u5b57\u6bb5\u5728\u8868&nbsp;87&nbsp;\u4e2d\u63cf\u8ff0\u3002Mode&nbsp;Direct\u5728\u76f4\u63a5\u6a21\u5f0f\u4e0b\u64cd\u4f5c\u65f6\uff0c\u6240\u6709\u4e2d\u65ad\u548c\u5f02\u5e38\u90fd\u4f1a\u6355\u83b7\u5230&nbsp;mtvec.BASE&nbsp;\u5730\u5740\u3002\u5728\u9677\u9631\u5904\u7406\u7a0b\u5e8f\u5185\u90e8\uff0c\u8f6f\u4ef6\u5fc5\u987b\u8bfb\u53d6&nbsp;mcause&nbsp;\u5bc4\u5b58\u5668\u4ee5\u786e\u5b9a\u89e6\u53d1\u9677\u9631\u7684\u539f\u56e0\u3002\u5728\u76f4\u63a5\u6a21\u5f0f\u4e0b\u64cd\u4f5c\u65f6\uff0cBASE&nbsp;\u5fc5\u987b\u662f&nbsp;4&nbsp;\u5b57\u8282\u5bf9\u9f50\u7684\u3002Mode&nbsp;Vectored\u5728\u5411\u91cf\u6a21\u5f0f\u4e0b\u8fd0\u884c\u65f6\uff0c\u4e2d\u65ad\u5c06&nbsp;pc&nbsp;\u8bbe\u7f6e\u4e3a&nbsp;mtvec.BASE&nbsp;+&nbsp;4&nbsp;\u00d7&nbsp;\u5f02\u5e38\u4ee3\u7801\uff08mcause.EXCCODE\uff09\u3002\u4f8b\u5982\uff0c\u5982\u679c\u53d1\u751f\u673a\u5668\u5b9a\u65f6\u5668\u4e2d\u65ad\uff0c\u5219\u5c06&nbsp;pc&nbsp;\u8bbe\u7f6e\u4e3a&nbsp;mtvec.BASE&nbsp;+&nbsp;0x1C\u3002\u901a\u5e38\uff0c\u9677\u9631\u5411\u91cf\u8868\u586b\u5145\u6709\u8df3\u8f6c\u6307\u4ee4\uff0c\u4ee5\u5c06\u63a7\u5236\u8f6c\u79fb\u5230\u7279\u5b9a\u4e8e\u4e2d\u65ad\u7684\u9677\u9631\u5904\u7406\u7a0b\u5e8f\u3002\u5728\u5411\u91cf\u4e2d\u65ad\u6a21\u5f0f\u4e0b\uff0cBASE&nbsp;\u5fc5\u987b\u662f&nbsp;256&nbsp;\u5b57\u8282\u5bf9\u9f50\u7684\u3002\u6240\u6709\u673a\u5668\u5916\u90e8\u4e2d\u65ad\uff08\u5168\u5c40\u4e2d\u65ad\uff09\u90fd\u6620\u5c04\u5230\u5f02\u5e38\u4ee3\u7801&nbsp;11\u3002\u56e0\u6b64\uff0c\u5f53\u542f\u7528\u4e2d\u65ad\u5411\u91cf\u65f6\uff0cpc&nbsp;\u8bbe\u7f6e\u4e3a\u4efb\u4f55\u5168\u5c40\u4e2d\u65ad\u7684\u5730\u5740&nbsp;mtvec.BASE&nbsp;+&nbsp;0x2C\u3002Machine&nbsp;Interrupt&nbsp;Enable&nbsp;(mie)\u901a\u8fc7\u8bbe\u7f6e&nbsp;mie&nbsp;\u5bc4\u5b58\u5668\u4e2d\u7684\u76f8\u5e94\u4f4d\u6765\u542f\u7528\u5404\u4e2a\u4e2d\u65ad\u3002Machine&nbsp;Interrupt&nbsp;Pending&nbsp;(mip)\u673a\u5668\u4e2d\u65ad\u6302\u8d77&nbsp;(mip)&nbsp;\u5bc4\u5b58\u5668\u6307\u793a\u5f53\u524d\u54ea\u4e9b\u4e2d\u65ad\u5904\u4e8e\u6302\u8d77\u72b6\u6001\u3002\u7279\u6743\u6a21\u5f0f\u4e2d\u65ad&nbsp;U54\u5185\u6838\u652f\u6301\u6709\u9009\u62e9\u5730\u5c06\u4e2d\u65ad\u548c\u5f02\u5e38\u5b9a\u5411\u5230S\u6a21\u5f0f\u3002\u8be5\u529f\u80fd\u7531\u4e2d\u65ad\u548c\u5f02\u5e38\u59d4\u6258CSR\u5904\u7406\uff1amideleg\u548cmedeleg\u3002S\u6a21\u5f0f\u4e2d\u65ad\u548c\u5f02\u5e38\u53ef\u4ee5\u901a\u8fc7stvec\u3001sip\u3001sie&nbsp;\u548c&nbsp;scause&nbsp;\u7ba1\u7406\u3002\u5728M\u6a21\u5f0f\u4e0b\uff0c\u8f6f\u4ef6\u8fd8\u53ef\u4ee5\u76f4\u63a5\u5199\u5165SIP\u5bc4\u5b58\u5668\uff0c\u4ece\u800c\u6709\u6548\u5730\u5411S\u6a21\u5f0f\u53d1\u9001\u4e2d\u65ad\u3002\u8fd9\u5bf9\u4e8e\u5b9a\u65f6\u5668\u548c\u8f6f\u4ef6\u4e2d\u65ad\u7279\u522b\u6709\u7528\uff0c\u56e0\u4e3a\u53ef\u80fd\u9700\u8981\u5728M\u6a21\u5f0f\u548cS\u6a21\u5f0f\u4e0b\u5904\u7406\u8fd9\u4e9b\u4e2d\u65ad\u3002Delegation&nbsp;Registers&nbsp;(mideleg&nbsp;and&nbsp;medeleg)\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u6240\u6709\u7684trap\u90fd\u5728M\u6a21\u5f0f\u4e0b\u5904\u7406\u3002M\u6a21\u5f0f\u4e0b\u8f6f\u4ef6\u53ef\u4ee5\u901a\u8fc7CSR&nbsp;\u6709\u9009\u62e9\u5730\u5c06\u4e2d\u65ad\u548c\u5f02\u5e38\u59d4\u6258\u7ed9S\u6a21\u5f0f\u3002\u5177\u4f53\u7684\u6620\u5c04\u5982\u8868&nbsp;92&nbsp;\u548c\u8868&nbsp;93&nbsp;\u3002\u6ce8\u610f\uff0c\u672c\u5730\u4e2d\u65ad\u53ef\u4ee5\u59d4\u6258\u7ed9M\u6a21\u5f0f\u3002Supervisor&nbsp;Status&nbsp;Register&nbsp;(sstatus)\u4e0eM\u6a21\u5f0f\u7c7b\u4f3c\uff0cS\u6a21\u5f0f\u6709\u4e00\u4e2a\u5bc4\u5b58\u5668\uff0c\u4e13\u95e8\u7528\u4e8e\u8ddf\u8e2a&nbsp;hart&nbsp;\u7684\u5f53\u524d\u72b6\u6001\uff0c\u79f0\u4e3a&nbsp;sstatus\u3002sstatus&nbsp;\u5b9e\u9645\u4e0a\u662f&nbsp;mstatus&nbsp;\u7684\u53d7\u9650\u89c6\u56fe\uff0c\u56e0\u4e3a\u5bf9&nbsp;sstatus&nbsp;\u6240\u505a\u7684\u66f4\u6539\u53cd\u6620\u5728&nbsp;mstatus&nbsp;\u4e2d\u3002\u901a\u8fc7\u5728&nbsp;sstatus&nbsp;\u4e2d\u8bbe\u7f6e&nbsp;SIE&nbsp;\u4f4d\u5e76\u5728&nbsp;sie&nbsp;\u5bc4\u5b58\u5668\u4e2d\u542f\u7528\u6240\u9700\u7684\u5355\u4e2a\u4e2d\u65ad\u6765\u542f\u7528\u4e2d\u65ad\u3002Supervisor&nbsp;Interrupt&nbsp;Enable&nbsp;Register&nbsp;(sie)\u901a\u8fc7\u5728&nbsp;sie&nbsp;\u5bc4\u5b58\u5668\u4e2d\u8bbe\u7f6e\u9002\u5f53\u7684\u4f4d\u6765\u542f\u7528\u7ba1\u7406\u5458\u4e2d\u65ad\u3002Supervisor&nbsp;Interrupt&nbsp;Pending&nbsp;(sip)S\u6a21\u5f0f\u4e2d\u65ad\u6302\u8d77&nbsp;(sip)&nbsp;\u5bc4\u5b58\u5668\u6307\u793a\u5f53\u524d\u54ea\u4e9b\u4e2d\u65ad\u6302\u8d77\u3002Supervisor&nbsp;Cause&nbsp;Register&nbsp;(scause)\u5f53S\u6a21\u5f0f\u4e0b\u6355\u83b7\u9677\u9631\u65f6\uff0c\u5c06\u5bfc\u81f4\u9677\u9631\u7684\u4e8b\u4ef6\u7684\u4ee3\u7801\u5199\u5165&nbsp;cause\u3002\u5f53\u5bfc\u81f4\u9677\u9631\u7684\u4e8b\u4ef6\u662f\u4e2d\u65ad\u65f6\uff0c\u6700\u9ad8\u6709\u6548\u4f4d scause&nbsp;\u8bbe\u7f6e\u4e3a&nbsp;1\uff0c\u6700\u4f4e\u6709\u6548\u4f4d\u8868\u793a\u4e2d\u65ad\u53f7\uff0c\u4f7f\u7528\u4e0e&nbsp;sip&nbsp;\u4e2d\u7684\u4f4d\u7f6e\u76f8\u540c\u7684\u7f16\u7801\u3002\u4f8b\u5982\uff0cS\u6a21\u5f0f\u5b9a\u65f6\u5668\u4e2d\u65ad\u5bfc\u81f4&nbsp;cause&nbsp;\u88ab\u8bbe\u7f6e\u4e3a&nbsp;0x8000_0000_0000_0005\u3002scause&nbsp;\u4e5f\u7528\u4e8e\u6307\u793a\u540c\u6b65\u5f02\u5e38\u7684\u539f\u56e0\uff0c\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0cscause&nbsp;\u7684\u6700\u9ad8\u6709\u6548\u4f4d\u8bbe\u7f6e\u4e3a&nbsp;0\u3002\u6709\u5173\u540c\u6b65\u5f02\u5e38\u4ee3\u7801\u7684\u5217\u8868\uff0c\u8bf7\u53c2\u89c1\u8868&nbsp;98\u3002Supervisor&nbsp;Trap&nbsp;Vector&nbsp;(stvec)\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u6240\u6709\u4e2d\u65ad\u90fd\u4f1a\u6355\u83b7\u5230&nbsp;stvec&nbsp;\u5bc4\u5b58\u5668\u4e2d\u5b9a\u4e49\u7684\u5355\u4e2a\u5730\u5740\u3002\u7531\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u8bfb\u53d6\u539f\u56e0\u5e76\u505a\u51fa\u76f8\u5e94\u7684\u53cd\u5e94\u3002RISC\u2011V&nbsp;\u548c&nbsp;U54&nbsp;\u5185\u6838\u8fd8\u652f\u6301\u9009\u62e9\u6027\u5730\u542f\u7528\u4e2d\u65ad\u5411\u91cf\u7684\u80fd\u529b\u3002\u5f53\u542f\u7528\u5411\u91cf\u65f6\uff0c\u5728&nbsp;sie&nbsp;\u4e2d\u5b9a\u4e49\u7684\u6bcf\u4e2a\u4e2d\u65ad\u90fd\u4f1a\u9677\u5165\u5230\u5b83\u81ea\u5df1\u7684\u7279\u5b9a\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u4e2d\u3002\u5f53&nbsp;stvec&nbsp;\u5bc4\u5b58\u5668\u7684&nbsp;MODE&nbsp;\u5b57\u6bb5\u8bbe\u7f6e\u4e3a&nbsp;1&nbsp;\u65f6\uff0c\u5411\u91cf\u4e2d\u65ad\u88ab\u542f\u7528\u3002\u5982\u679c\u5411\u91cf\u4e2d\u65ad\u88ab\u7981\u7528&nbsp;(stvec.MODE=0)\uff0c\u6240\u6709\u4e2d\u65ad\u90fd\u4f1a\u9677\u5165&nbsp;stvec.BASE&nbsp;\u5730\u5740\u3002\u5982\u679c\u542f\u7528\u77e2\u91cf\u4e2d\u65ad&nbsp;(stvec.MODE=1)\uff0c\u4e2d\u65ad\u5c06&nbsp;pc&nbsp;\u8bbe\u7f6e\u4e3a&nbsp;stvec.BASE&nbsp;+&nbsp;4&nbsp;\u00d7&nbsp;\u5f02\u5e38\u4ee3\u7801&nbsp;(scause.EXCCODE)\u3002\u4f8b\u5982\uff0c\u5982\u679c\u53d1\u751f\u7ba1\u7406\u5b9a\u65f6\u5668\u4e2d\u65ad\uff0c\u5219&nbsp;pc&nbsp;\u8bbe\u7f6e\u4e3a&nbsp;stvec.BASE&nbsp;+&nbsp;0x14\u3002\u901a\u5e38\uff0c\u9677\u9631\u5411\u91cf\u8868\u4e2d\u586b\u5145\u6709\u8df3\u8f6c\u6307\u4ee4\uff0c\u4ee5\u5c06\u63a7\u5236\u8f6c\u79fb\u5230\u7279\u5b9a\u4e8e\u4e2d\u65ad\u7684\u9677\u9631\u5904\u7406\u7a0b\u5e8f\u3002\u5728\u5411\u91cf\u4e2d\u65ad\u6a21\u5f0f\u4e0b\uff0cBASE&nbsp;\u5fc5\u987b\u662f&nbsp;128&nbsp;\u5b57\u8282\u5bf9\u9f50\u7684\u3002\u6240\u6709\u4e3b\u7ba1\u5916\u90e8\u4e2d\u65ad\uff08\u5168\u5c40\u4e2d\u65ad\uff09\u90fd\u6620\u5c04\u5230\u5f02\u5e38\u4ee3\u7801&nbsp;9\u3002\u56e0\u6b64\uff0c\u5f53\u542f\u7528\u4e2d\u65ad\u5411\u91cf\u65f6\uff0cpc&nbsp;\u88ab\u8bbe\u7f6e\u4e3a\u4efb\u4f55\u5168\u5c40\u4e2d\u65ad\u7684\u5730\u5740&nbsp;stvec.BASE&nbsp;+&nbsp;0x24\u3002Delegated&nbsp;Interrupt&nbsp;Handling\u63a5\u53d7\u59d4\u6d3e\u9677\u9631\u540e\uff0c\u4f1a\u53d1\u751f\u4ee5\u4e0b\u60c5\u51b5\uff1asstatus.SIE&nbsp;\u7684\u503c\u88ab\u590d\u5236\u5230&nbsp;sstatus.SPIE\uff0c\u7136\u540e&nbsp;sstatus.SIE&nbsp;\u88ab\u6e05\u9664\uff0c\u6709\u6548\u5730\u7981\u7528\u4e2d\u65ad\u3002\u5f53\u524dpc\u88ab\u590d\u5236\u5230sepc\u5bc4\u5b58\u5668\u4e2d\uff0c\u7136\u540epc\u88ab\u8bbe\u7f6e\u4e3astvec\u7684\u503c\u3002\u5728\u542f\u7528\u77e2\u91cf\u4e2d\u65ad\u7684\u60c5\u51b5\u4e0b\uff0cpc&nbsp;\u8bbe\u7f6e\u4e3a&nbsp;stvec.BASE&nbsp;+&nbsp;4&nbsp;\u00d7&nbsp;\u5f02\u5e38\u4ee3\u7801&nbsp;(scause.EXCCODE)\u3002\u4e2d\u65ad\u524d\u7684\u7279\u6743\u6a21\u5f0f\u7f16\u7801\u5728&nbsp;sstatus.SPP&nbsp;\u4e2d\u6b64\u65f6\uff0c\u63a7\u5236\u6743\u79fb\u4ea4\u7ed9\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u4e2d\u7684\u8f6f\u4ef6\uff0c\u4e2d\u65ad\u88ab\u7981\u7528\u3002\u53ef\u4ee5\u901a\u8fc7\u663e\u5f0f\u8bbe\u7f6e&nbsp;sstatus.SIE&nbsp;\u6216\u6267\u884c&nbsp;SRET&nbsp;\u6307\u4ee4\u9000\u51fa\u5904\u7406\u7a0b\u5e8f\u6765\u91cd\u65b0\u542f\u7528\u4e2d\u65ad\u3002\u6267\u884c&nbsp;SRET&nbsp;\u6307\u4ee4\u65f6\uff0c\u4f1a\u53d1\u751f\u4ee5\u4e0b\u60c5\u51b5\uff1a\u7279\u6743\u6a21\u5f0f\u8bbe\u7f6e\u4e3a&nbsp;sstatus.SPP&nbsp;\u4e2d\u7f16\u7801\u7684\u503cstatus.SPIE&nbsp;\u7684\u503c\u88ab\u590d\u5236\u5230&nbsp;status.SIE \u767b\u5f55\u540e\u590d\u5236 pc \u8bbe\u7f6e\u4e3a sepc \u7684\u503c \u6b64\u65f6\uff0c\u63a7\u5236\u6743\u4ea4\u7ed9\u4e86\u8f6f\u4ef6 \u4e2d\u65ad\u5ef6\u8fdf U54\u5185\u6838\u7684\u4e2d\u65ad\u5ef6\u8fdf\u4e3a\u56db\u4e2a external_source_for_core_N_clock \u5468\u671f\uff0c\u8ba1\u7b97\u65b9\u5f0f\u662f\u4ece\u5411 hart \u53d1\u9001\u4e2d\u65ad\u4fe1\u53f7\u5230\u5904\u7406\u7a0b\u5e8f\u7684\u7b2c\u4e00\u4e2a\u6307\u4ee4\u83b7\u53d6\u6240\u9700\u7684\u5468\u671f\u6570\u3002 \u901a\u8fc7 PLIC \u8def\u7531\u7684\u5168\u5c40\u4e2d\u65ad\u4f1a\u5bfc\u81f4\u4e09\u4e2a\u65f6\u949f\u5468\u671f\u7684\u989d\u5916\u5ef6\u8fdf\uff0c\u5176\u4e2d PLIC \u7531\u65f6\u949f\u8ba1\u65f6\u3002\u8fd9\u610f\u5473\u7740\u5168\u5c40\u4e2d\u65ad\u7684\u603b\u5ef6\u8fdf\uff08\u4ee5\u5468\u671f\u4e3a\u5355\u4f4d\uff09\u4e3a\uff1a4 + 3 \u00d7 (external_source_for_core_N_clock Hz \u00f7 clock Hz)\u3002\u8fd9\u662f\u6700\u4f73\u60c5\u51b5\u4e0b\u7684\u5faa\u73af\u8ba1\u6570\uff0c\u5e76\u5047\u5b9a\u5904\u7406\u7a0b\u5e8f\u5df2\u7f13\u5b58\u3002\u5b83\u6ca1\u6709\u8003\u8651\u6765\u81ea\u5916\u56f4\u6e90\u7684\u989d\u5916\u5ef6\u8fdf \u4e0d\u53ef\u5c4f\u853d\u4e2d\u65ad rnmi\uff08\u53ef\u6062\u590d\u4e0d\u53ef\u5c4f\u853d\u4e2d\u65ad\uff09\u4e2d\u65ad\u4fe1\u53f7\u662f hart \u7684\u7535\u5e73\u654f\u611f\u8f93\u5165\u3002\u4e0d\u53ef\u5c4f\u853d\u4e2d\u65ad\u6bd4 hart \u4e0a\u7684\u4efb\u4f55\u5176\u4ed6\u4e2d\u65ad\u6216\u5f02\u5e38\u5177\u6709\u66f4\u9ad8\u7684\u4f18\u5148\u7ea7\uff0c\u5e76\u4e14\u4e0d\u80fd\u88ab\u8f6f\u4ef6\u7981\u7528\u3002\u5177\u4f53\u6765\u8bf4\uff0c\u5b83\u4eec\u4e0d\u4f1a\u901a\u8fc7\u6e05\u9664 mstatus.mie \u5bc4\u5b58\u5668\u6765\u7981\u7528\u3002 Handler Addresses NMI \u6709\u4e00\u4e2a\u5173\u8054\u7684\u5f02\u5e38\u9677\u9631\u5904\u7406\u7a0b\u5e8f\u5730\u5740\u3002\u8be5\u5730\u5740\u7531\u5916\u90e8\u8f93\u5165\u4fe1\u53f7\u8bbe\u7f6e\u3002 RNMI CSRs \u8fd9\u4e9b M \u6a21\u5f0f CSR \u542f\u7528\u53ef\u6062\u590d\u975e\u5c4f\u853d\u4e2d\u65ad (RNMI)\u3002 mnscratch CSR \u62e5\u6709\u4e00\u4e2a 64 \u4f4d\u8bfb\u5199\u5bc4\u5b58\u5668\uff0c\u5b83\u4f7f NMI 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