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<p style="color: #777777;">
<a href="https://gitlab.rtems.org/sebhub">Sebastian Huber</a>
started a new
discussion on <a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/113#note_112155">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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220
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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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<td class="old_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">
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">The approach with this table is quite complicated and not necessary for most systems. Why can't you simply call a function which is provided by the BSP? For example:</p>
<div class="gl-relative markdown-code-block js-markdown-code">
<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style="display: block; font-size: 90%; color: #28272d; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: monospace; word-break: break-all; word-wrap: break-word; background-color: #ffffff; -premailer-cellpadding: 0; -premailer-cellspacing: 0; -premailer-width: 100%; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;"><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; white-space: pre; margin-top: 0; 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; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">#ifdef RTEMS_SMP</span>
<span id="LC2" class="line" lang="plaintext"> bl _AArch64_Get_current_processor</span>
<span id="LC3" class="line" lang="plaintext"> ...</span></code></pre>
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<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">The default implementation is:</p>
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<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style="display: block; font-size: 90%; color: #28272d; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: monospace; word-break: break-all; word-wrap: break-word; background-color: #ffffff; -premailer-cellpadding: 0; -premailer-cellspacing: 0; -premailer-width: 100%; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;"><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; white-space: pre; margin-top: 0; 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; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">FUNCTION_ENTRY(_AArch64_Get_current_processor)</span>
<span id="LC2" class="line" lang="plaintext"> mrs x0, mpidr_el1</span>
<span id="LC3" class="line" lang="plaintext"> and x0, x0, #0xff</span>
<span id="LC4" class="line" lang="plaintext">FUNCTION_END(_AArch64_Get_current_processor)</span></code></pre>
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