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<a href="https://gitlab.rtems.org/zhengxiaojun">xiaojun zheng</a>
commented on a
discussion on <a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/113#note_112238">bsps/aarch64/shared/start/start.S</a>:
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span id="LC219" class="line" lang="armasm"><span class="nl">_el1_start</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">:</span></span>
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span id="LC220" class="line" lang="armasm"></span>
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<td class="old_line diff-line-num" data-linenumber="221" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
221
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<td class="new_line diff-line-num" data-linenumber="221" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
221
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span id="LC221" class="line" lang="armasm"><span class="cp" style="color: #999999; font-weight: 600;">#ifdef RTEMS_SMP</span></span>
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222
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<td class="new_line diff-line-num old" data-linenumber="222" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: inherit;" align="right" bgcolor="#f9d7dc">
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<td class="line_content old" style="padding: inherit;" bgcolor="#fbe9eb"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>-<span id="LC222" class="line" lang="armasm"> <span class="err" style="color: #a61717; background-color: #e3d2d2;">/</span><span class="k" style="font-weight: 600;">*</span> <span class="nv" style="color: #008080;">Read</span> <span class="nv" style="color: #008080;">MPIDR</span> <span class="nv" style="color: #008080;">and</span> <span class="nv" style="color: #008080;">get</span> <span class="nv" style="color: #008080;">current</span> <span class="nv" style="color: #008080;">processor</span> <span class="nv" style="color: #008080;">index</span> <span class="o" style="font-weight: 600;">*/</span></span>
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<td class="old_line diff-line-num old" data-linenumber="223" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: inherit;" align="right" bgcolor="#f9d7dc">
223
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<td class="new_line diff-line-num old" data-linenumber="222" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: inherit;" align="right" bgcolor="#f9d7dc">
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<td class="line_content old" style="padding: inherit;" bgcolor="#fbe9eb"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>-<span id="LC223" class="line" lang="armasm"> <span class="nb" style="color: #0086b3;">mrs</span> <span class="nv" style="color: #008080;">x7</span><span class="o" style="font-weight: 600;">,</span> <span class="nv" style="color: #008080;">mpidr_el1</span></span>
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<td class="old_line diff-line-num old" data-linenumber="224" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: inherit;" align="right" bgcolor="#f9d7dc">
224
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<td class="new_line diff-line-num old" data-linenumber="222" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: inherit;" align="right" bgcolor="#f9d7dc">
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<td class="line_content old" style="padding: inherit;" bgcolor="#fbe9eb"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>-<span id="LC224" class="line" lang="armasm"> <span class="nb" style="color: #0086b3;">and</span> <span class="nv" style="color: #008080;">x7</span><span class="o" style="font-weight: 600;">,</span> <span class="nv" style="color: #008080;">x7</span><span class="o" style="font-weight: 600;">,</span> <span class="o" style="font-weight: 600;">#</span><span class="mh" style="color: #009999;">0xff</span></span>
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<td class="old_line diff-line-num new" data-linenumber="225" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
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<td class="new_line diff-line-num new" data-linenumber="222" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
222
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC222" class="line" lang="armasm"> <span class="nb" style="color: #0086b3;">ldr</span> <span class="nv" style="color: #008080;">x3</span><span class="o" style="font-weight: 600;">,</span> <span class="o" style="font-weight: 600;">=</span><span class="nv" style="color: #008080;">aarch64_cpu_boot_params</span></span>
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<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial"><code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0; font-weight: inherit; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>aarch64_cpu_boot_params</code> is not the map table, it is a global variable used to store the core index that core0 want to start, so the core can setup stack pointer correctly. If call <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>_AArch64_Get_current_processor</code> here, how to decide whether to call default implementation or the map implementation? And the function should be callable from assembly code, I think use a global variable here can reduce complexity.</p>
<p dir="auto" style="color: #28272d; margin: 0;" align="initial">The patch provided two functions aarch64_get/set_cpu_hwid() to visit the map table, in fact, only the get function is nessary for now, if the hwid is loaded from dts maybe set function is needed. And the map table can be static.</p>
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