{"id":17772,"date":"2026-06-10T08:50:38","date_gmt":"2026-06-10T00:50:38","guid":{"rendered":"https:\/\/ab123.xyz\/?p=17772"},"modified":"2026-06-10T08:50:38","modified_gmt":"2026-06-10T00:50:38","slug":"risc-v-%e4%b8%ad%e6%96%ad%e6%8e%a7%e5%88%b6%e5%99%a8-plic-%e9%85%8d%e7%bd%ae%e4%b8%8e%e4%b8%ad%e6%96%ad%e5%bb%b6%e8%bf%9f%e4%bc%98%e5%8c%96%e6%8a%80%e5%b7%a7","status":"publish","type":"post","link":"https:\/\/ab123.xyz\/?p=17772","title":{"rendered":"RISC-V \u4e2d\u65ad\u63a7\u5236\u5668 (PLIC) \u914d\u7f6e\u4e0e\u4e2d\u65ad\u5ef6\u8fdf\u4f18\u5316\u6280\u5de7"},"content":{"rendered":"<p>\u5728\u5b9e\u65f6\u5d4c\u5165\u5f0f\u7cfb\u7edf\u4e0e\u9ad8\u6027\u80fd\u8ba1\u7b97\u573a\u666f\u4e2d\uff0cRISC-V \u5e73\u53f0\u7ea7\u4e2d\u65ad\u63a7\u5236\u5668 (PLIC) \u7684\u914d\u7f6e\u6548\u7387\u76f4\u63a5\u5f71\u54cd\u4e2d\u65ad\u5ef6\u8fdf\u548c\u7cfb\u7edf\u54cd\u5e94\u901f\u5ea6\u3002\u672c\u6587\u7cfb\u7edf\u4ecb\u7ecd PLIC \u7684\u6838\u5fc3\u529f\u80fd\u3001\u914d\u7f6e\u65b9\u6cd5\u53ca\u5ef6\u8fdf\u4f18\u5316\u7b56\u7565\uff0c\u5e76\u63a8\u8350\u6743\u5a01\u5de5\u5177\u4e0e\u5b66\u4e60\u8d44\u6e90\u3002<\/p>\n<h2>PLIC \u529f\u80fd\u4e0e\u67b6\u6784\u4f18\u52bf<\/h2>\n<p>PLIC (Platform-Level Interrupt Controller) \u662f RISC-V \u6807\u51c6\u4e2d\u8d1f\u8d23\u7ba1\u7406\u5916\u90e8\u4e2d\u65ad\u7684\u63a7\u5236\u5668\u3002\u5b83\u652f\u6301\u591a\u7ea7\u4f18\u5148\u7ea7\u3001\u591a\u76ee\u6807 hart \u5206\u53d1\u4ee5\u53ca\u4e2d\u65ad\u5411\u91cf\u5316\uff0c\u53ef\u7075\u6d3b\u9002\u914d\u4ece IoT \u5230\u670d\u52a1\u5668\u7b49\u591a\u79cd\u573a\u666f\u3002\u4e0e\u4f20\u7edf\u4e2d\u65ad\u63a7\u5236\u5668\u76f8\u6bd4\uff0cPLIC \u901a\u8fc7\u5168\u5c40\u4f18\u5148\u7ea7\u77e9\u9635\u548c\u4e2d\u65ad\u6458\u53d6\u673a\u5236\uff0c\u663e\u8457\u964d\u4f4e\u4e2d\u65ad\u51b2\u7a81\u6982\u7387\u3002<\/p>\n<h3>\u6838\u5fc3\u7279\u6027<\/h3>\n<ul>\n<li>\u652f\u6301\u6700\u591a 1023 \u4e2a\u5916\u90e8\u4e2d\u65ad\u6e90\uff0c\u6bcf\u4e2a\u4e2d\u65ad\u53ef\u72ec\u7acb\u914d\u7f6e\u4f18\u5148\u7ea7\u3002<\/li>\n<li>\u652f\u6301\u591a\u4e2a\u76ee\u6807 Hart\uff08\u786c\u4ef6\u7ebf\u7a0b\uff09\uff0c\u4e2d\u65ad\u53ef\u5b9a\u5411\u81f3\u7279\u5b9a\u6838\u5fc3\u3002<\/li>\n<li>\u63d0\u4f9b\u4e2d\u65ad\u5b8c\u6210\u901a\u77e5\u4e0e\u4f18\u5148\u7ea7\u9608\u503c\u63a7\u5236\uff0c\u63d0\u5347\u5d4c\u5957\u4e2d\u65ad\u6548\u7387\u3002<\/li>\n<\/ul>\n<h2>PLIC \u914d\u7f6e\u6b65\u9aa4\u8be6\u89e3<\/h2>\n<p>\u6b63\u786e\u914d\u7f6e PLIC \u662f\u4f18\u5316\u4e2d\u65ad\u5ef6\u8fdf\u7684\u524d\u63d0\u3002\u4ee5\u4e0b\u4e3a\u5178\u578b\u914d\u7f6e\u6d41\u7a0b\uff1a<\/p>\n<h3>\u5bc4\u5b58\u5668\u521d\u59cb\u5316<\/h3>\n<ul>\n<li>\u8bbe\u7f6e\u5168\u5c40\u4f18\u5148\u7ea7\u9608\u503c\u5bc4\u5b58\u5668 (threshold)\uff0c\u9ed8\u8ba4 0 \u8868\u793a\u4f7f\u80fd\u6240\u6709\u4e2d\u65ad\u3002<\/li>\n<li>\u4e3a\u6bcf\u4e2a\u4e2d\u65ad\u6e90\u5728\u4f18\u5148\u7ea7\u5bc4\u5b58\u5668\u4e2d\u5199\u5165 1-7 \u7684\u4f18\u5148\u7ea7\u503c\u3002<\/li>\n<li>\u901a\u8fc7\u4e2d\u65ad\u4f7f\u80fd\u5bc4\u5b58\u5668 (enable) \u6309 bit \u5f00\u542f\u6240\u9700\u4e2d\u65ad\u3002<\/li>\n<\/ul>\n<h3>\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u4f18\u5316<\/h3>\n<p>\u5728\u4e2d\u65ad\u670d\u52a1\u4f8b\u7a0b (ISR) \u4e2d\uff0c\u5e94\u91c7\u7528\u201c\u5148\u6458\u53d6\u540e\u5904\u7406\u201d\u6a21\u5f0f\uff1a\u9996\u5148\u8bfb\u53d6 claim\/complete \u5bc4\u5b58\u5668\u83b7\u53d6\u4e2d\u65ad\u53f7\uff0c\u518d\u6267\u884c\u5177\u4f53\u5904\u7406\uff0c\u6700\u540e\u5199 complete \u5bc4\u5b58\u5668\u91ca\u653e\u4e2d\u65ad\u3002\u907f\u514d\u5728 ISR \u5185\u8fdb\u884c\u957f\u65f6\u95f4\u8fd0\u7b97\u6216 I\/O \u7b49\u5f85\u3002<\/p>\n<h2>\u4e2d\u65ad\u5ef6\u8fdf\u4f18\u5316\u6280\u5de7<\/h2>\n<h3>\u786c\u4ef6\u7ea7\u52a0\u901f<\/h3>\n<ul>\n<li>\u4f7f\u7528 PLIC \u7684\u786c\u4ef6\u5411\u91cf\u4e2d\u65ad\u6a21\u5f0f (Vectored Interrupt)\uff0c\u51cf\u5c11\u4e2d\u65ad\u67e5\u627e\u5f00\u9500\u3002<\/li>\n<li>\u5c06\u9ad8\u9891\u4e2d\u65ad\u914d\u7f6e\u4e3a\u6700\u9ad8\u4f18\u5148\u7ea7\uff0c\u5e76\u7ed1\u5b9a\u81f3\u4e13\u7528 Hart\uff0c\u907f\u514d\u6838\u95f4\u4e89\u7528\u3002<\/li>\n<\/ul>\n<h3>\u8f6f\u4ef6\u7b56\u7565<\/h3>\n<ul>\n<li>\u5229\u7528\u4f18\u5148\u7ea7\u9608\u503c\u5c4f\u853d\u4f4e\u4f18\u5148\u7ea7\u4e2d\u65ad\uff0c\u51cf\u5c11\u9891\u7e41\u7684\u4e0a\u4e0b\u6587\u5207\u6362\u3002<\/li>\n<li>\u7ed3\u5408 RISC-V \u7684 WFI \u6307\u4ee4\u4e0e PLIC \u7684\u4e2d\u65ad\u5524\u9192\u673a\u5236\uff0c\u964d\u4f4e\u7a7a\u95f2\u529f\u8017\u540c\u65f6\u4fdd\u6301\u4f4e\u5ef6\u8fdf\u3002<\/li>\n<li>\u91c7\u7528\u4e2d\u65ad\u805a\u5408 (Interrupt Coalescing) \u6280\u672f\uff0c\u5c06\u77ed\u65f6\u95f4\u5185\u91cd\u590d\u4e2d\u65ad\u5408\u5e76\u5904\u7406\u3002<\/li>\n<\/ul>\n<h2>\u63a8\u8350\u5de5\u5177\u4e0e\u6743\u5a01\u8d44\u6e90<\/h2>\n<p>RISC-V \u56fd\u9645\u57fa\u91d1\u4f1a\u63d0\u4f9b\u4e86\u8be6\u5c3d\u7684 PLIC \u89c4\u8303\u6587\u6863\u548c\u53c2\u8003\u5b9e\u73b0\u3002\u5f00\u53d1\u8005\u53ef\u901a\u8fc7\u5b98\u65b9\u4ed3\u5e93\u83b7\u53d6\u6700\u65b0\u5bc4\u5b58\u5668\u5b9a\u4e49\u4e0e\u914d\u7f6e\u793a\u4f8b\u3002\u6b64\u5916\uff0c\u5f00\u6e90\u9879\u76ee <em>riscv-plic-driver<\/em> \u63d0\u4f9b\u4e86 Linux \u4e0e\u88f8\u673a\u73af\u5883\u4e0b\u7684\u9a71\u52a8\u6a21\u677f\uff0c\u652f\u6301\u5feb\u901f\u9a8c\u8bc1\u5ef6\u8fdf\u4f18\u5316\u6548\u679c\u3002<\/p>\n<p>\u8bbf\u95ee <a href=\"https:\/\/riscv.org\/\" target=\"_blank\">RISC-V \u5b98\u65b9\u7f51\u7ad9<\/a> \u83b7\u53d6\u6700\u65b0\u89c4\u8303\u3001\u5f00\u53d1\u5de5\u5177\u53ca\u793e\u533a\u6848\u4f8b\u3002<\/p>\n<h2>\u6700\u65b0\u70ed\u70b9\u65b0\u95fb<\/h2>\n<p>\u3010\u6807\u9898\u3011\u4e2d\u56fd\u6210\u529f\u53d1\u5c04\u9065\u611f\u56db\u5341\u4e8c\u53f702\u661f\uff0c\u52a9\u529b\u56fd\u571f\u8d44\u6e90\u666e\u67e5<br \/>\u3010\u5206\u7c7b\u3011\u79d1\u6280<br \/>\u3010\u6b63\u6587\u3011\u6211\u56fd\u5728\u897f\u660c\u536b\u661f\u53d1\u5c04\u4e2d\u5fc3\u4f7f\u7528\u957f\u5f81\u4e8c\u53f7\u4e01\u8fd0\u8f7d\u706b\u7bad\uff0c\u6210\u529f\u5c06\u9065\u611f\u56db\u5341\u4e8c\u53f702\u661f\u9001\u5165\u9884\u5b9a\u8f68\u9053\u3002\u8be5\u536b\u661f\u4e3b\u8981\u7528\u4e8e\u79d1\u5b66\u8bd5\u9a8c\u3001\u56fd\u571f\u8d44\u6e90\u666e\u67e5\u7b49\u9886\u57df\uff0c\u8fdb\u4e00\u6b65\u63d0\u5347\u4e86\u6211\u56fd\u7a7a\u95f4\u5bf9\u5730\u89c2\u6d4b\u80fd\u529b\u3002<br \/>\u3010\u6765\u6e90\u3011\u65b0\u534e\u793e\u5b98\u65b9\u62a5\u9053<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u5b9e\u65f6\u5d4c\u5165\u5f0f\u7cfb\u7edf\u4e0e\u9ad8\u6027\u80fd\u8ba1\u7b97\u573a\u666f\u4e2d\uff0cRISC-V \u5e73\u53f0\u7ea7\u4e2d\u65ad\u63a7\u5236\u5668 (PLIC) \u7684\u914d\u7f6e\u6548\u7387\u76f4\u63a5\u5f71\u54cd\u4e2d\u65ad\u5ef6\u8fdf\u548c [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[21134,20932,21135,21137,21136],"class_list":["post-17772","post","type-post","status-publish","format-standard","hentry","category-4","tag-plic-","tag-risc-v","tag-21135","tag-21137","tag-21136"],"_links":{"self":[{"href":"https:\/\/ab123.xyz\/index.php?rest_route=\/wp\/v2\/posts\/17772","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ab123.xyz\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ab123.xyz\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ab123.xyz\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ab123.xyz\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=17772"}],"version-history":[{"count":1,"href":"https:\/\/ab123.xyz\/index.php?rest_route=\/wp\/v2\/posts\/17772\/revisions"}],"predecessor-version":[{"id":17773,"href":"https:\/\/ab123.xyz\/index.php?rest_route=\/wp\/v2\/posts\/17772\/revisions\/17773"}],"wp:attachment":[{"href":"https:\/\/ab123.xyz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=17772"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ab123.xyz\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=17772"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ab123.xyz\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=17772"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}