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<a href="https://gitlab.rtems.org/DonutAnees">Mohammed Anees</a>
commented on a
discussion on <a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1121#note_153396">bsps/i386/shared/irq/apic.c</a>:
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<td class="new_line diff-line-num new" data-linenumber="34" 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="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style="display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;">+<span class="line" data-lang="c"></span>
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<td class="new_line diff-line-num new" data-linenumber="35" 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">
35
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style="display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;">+<span class="line" data-lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kt" style="color: #445588; font-weight: 600;">void</span> <span class="nf" style="color: #990000; font-weight: 600;">wait_ipi</span><span class="p">(</span><span class="kt" style="color: #445588; font-weight: 600;">void</span><span class="p">)</span></span>
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<td class="new_line diff-line-num new" data-linenumber="36" 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">
36
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style="display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;">+<span class="line" data-lang="c"><span class="p">{</span></span>
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<td class="new_line diff-line-num new" data-linenumber="37" 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">
37
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style="display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;">+<span class="line" data-lang="c"> <span class="kt" style="color: #445588; font-weight: 600;">int</span> <span class="n" style="color: #333333;">to</span><span class="p">,</span> <span class="n" style="color: #333333;">send_status</span><span class="p">;</span></span>
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<td class="new_line diff-line-num new" data-linenumber="38" 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">
38
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style="display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;">+<span class="line" data-lang="c"> <span class="n" style="color: #333333;">to</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #009999;">0</span><span class="p">;</span></span>
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<td class="new_line diff-line-num new" data-linenumber="39" 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">
39
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style="display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;">+<span class="line" data-lang="c"> <span class="k" style="font-weight: 600;">do</span> <span class="p">{</span></span>
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<td class="new_line diff-line-num new" data-linenumber="40" 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">
40
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style="display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;">+<span class="line" data-lang="c"> <span class="n" style="color: #333333;">UDELAY</span><span class="p">(</span><span class="mi" style="color: #009999;">100</span><span class="p">);</span></span>
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<td class="new_line diff-line-num new" data-linenumber="41" 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">
41
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style="display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;">+<span class="line" data-lang="c"> <span class="n" style="color: #333333;">send_status</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333333;">i386_lapic_base</span><span class="p">[</span><span class="n" style="color: #333333;">LAPIC_REGISTER_ICR_LOW</span><span class="p">]</span> <span class="o" style="font-weight: 600;">&</span> <span class="n" style="color: #333333;">LAPIC_ICR_STATUS_PEND</span><span class="p">;</span></span>
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<td class="new_line diff-line-num new" data-linenumber="42" 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">
42
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style="display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;">+<span class="line" data-lang="c"> <span class="p">}</span> <span class="k" style="font-weight: 600;">while</span> <span class="p">(</span><span class="n" style="color: #333333;">send_status</span> <span class="o" style="font-weight: 600;">&&</span> <span class="p">(</span><span class="n" style="color: #333333;">to</span><span class="o" style="font-weight: 600;">++</span> <span class="o" style="font-weight: 600;"><</span> <span class="mi" style="color: #009999;">1000</span><span class="p">));</span> </span>
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style="display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;">+<span class="line" data-lang="c"><span class="p">}</span></span>
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style="display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;">+<span class="line" data-lang="c"></span>
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<td class="new_line diff-line-num new" data-linenumber="45" 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">
45
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style="display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;">+<span class="line" data-lang="c"><span class="kt" style="color: #445588; font-weight: 600;">void</span></span>
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<td class="new_line diff-line-num new" data-linenumber="46" 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">
46
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style="display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;">+<span class="line" data-lang="c"><span class="nf" style="color: #990000; font-weight: 600;">lapic_clear_errors</span><span class="p">(</span><span class="kt" style="color: #445588; font-weight: 600;">void</span><span class="p">)</span></span>
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47
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style="display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;">+<span class="line" data-lang="c"><span class="p">{</span></span>
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<td class="new_line diff-line-num new" data-linenumber="48" 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">
48
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style="display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;">+<span class="line" data-lang="c"> <span class="n" style="color: #333333;">i386_lapic_base</span><span class="p">[</span><span class="n" style="color: #333333;">LAPIC_REGISTER_ESR</span><span class="p">]</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #009999;">0</span><span class="p">;</span></span>
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<td class="new_line diff-line-num new" data-linenumber="49" 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">
49
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style="display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;">+<span class="line" data-lang="c"> <span class="p">(</span><span class="kt" style="color: #445588; font-weight: 600;">void</span><span class="p">)</span> <span class="n" style="color: #333333;">i386_lapic_base</span><span class="p">[</span><span class="n" style="color: #333333;">LAPIC_REGISTER_ESR</span><span class="p">];</span></span>
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<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial"><a class="no-attachment-icon gfm" href="https://gitlab.rtems.org/-/project/26/uploads/b999e789ff82bc5aa18e49ba426997ed/Screenshot_2026-06-27_at_5.09.08_PM.png" target="_blank" rel="noopener noreferrer" data-canonical-src="/uploads/b999e789ff82bc5aa18e49ba426997ed/Screenshot_2026-06-27_at_5.09.08_PM.png" data-link="true" style="margin-top: 0px;"><img src="https://gitlab.rtems.org/-/project/26/uploads/b999e789ff82bc5aa18e49ba426997ed/Screenshot_2026-06-27_at_5.09.08_PM.png" alt="Screenshot 2026-06-27 at 5.09.08 PM.png" width="415" height="129" data-canonical-src="/uploads/b999e789ff82bc5aa18e49ba426997ed/Screenshot_2026-06-27_at_5.09.08_PM.png" class="gfm" style="max-width: 100%; height: auto; margin-top: 0px; vertical-align: baseline; object-fit: contain; object-position: top;"></a></p>
<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">the read is emitted but i think its because i386_lapic_base is declared volatile. Removing the volatile qualifier causes the compiler to optimize the read away</p>
<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">i looked at the origin implementation from which the code was derived from, I dont see any confirmation on the read there either - <a href="http://www.uruk.org/mps/smp-imps.c" rel="nofollow noreferrer noopener" target="_blank" style="margin-top: 0px;">http://www.uruk.org/mps/smp-imps.c</a></p>
<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial"><a href="https://cgit.freebsd.org/src/tree/sys/x86/x86/local_apic.c" rel="nofollow noreferrer noopener" target="_blank" style="margin-top: 0px;">https://cgit.freebsd.org/src/tree/sys/x86/x86/local_apic.c</a> I also checked the freebsd implementation, when clearing the ESR during LAPIC setup, it only writes 0 to the ESR and does not read it back, the intel</p>
<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial"><a class="no-attachment-icon gfm" href="https://gitlab.rtems.org/-/project/26/uploads/fe0979354c9ba76a055dc8cb8cc036ae/Screenshot_2026-06-27_at_5.35.03_PM.png" target="_blank" rel="noopener noreferrer" data-canonical-src="/uploads/fe0979354c9ba76a055dc8cb8cc036ae/Screenshot_2026-06-27_at_5.35.03_PM.png" data-link="true" style="margin-top: 0px;"><img src="https://gitlab.rtems.org/-/project/26/uploads/fe0979354c9ba76a055dc8cb8cc036ae/Screenshot_2026-06-27_at_5.35.03_PM.png" alt="Screenshot 2026-06-27 at 5.35.03 PM.png" width="504" height="104" data-canonical-src="/uploads/fe0979354c9ba76a055dc8cb8cc036ae/Screenshot_2026-06-27_at_5.35.03_PM.png" class="gfm" style="max-width: 100%; height: auto; margin-top: 0px; vertical-align: baseline; object-fit: contain; object-position: top;"></a></p>
<p dir="auto" style="color: #3a383f; margin: 0px;" align="initial">i have built and run the tests without the read and that did not cause any problems, the intel developer manual doesnt seem to mention anything explicitly about this read either, maybe this read can be removed?</p>
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