[PATCH 0/6 gnumach] Preparation for parallel SMP init
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[PATCH 0/6 gnumach] Preparation for parallel SMP init
From
Damien Zammit
Subject
[PATCH 0/6 gnumach] Preparation for parallel SMP init
Date
Mon, 09 Dec 2024 12:17:15 +0000
Hi,
This patchset consists of 6 patches that have been tested **not** to break
both smp and non-smp systems, but get us closer to having smp working fully.
The rationale for going with parallel init for smp is that APICs are not
individually addressible for more than 8 cpus (in logical mode) or 16 cpus
(in physical mode), unless it is a Pentium 4 or Xeon processor, where you may
address 256 individual APIC ids. Also, if the physical apic id > 0xf, you can't
address it at all with physical mode on modern non-Xeon cpus.
Therefore, to support INIT and STARTUP on > 8 cpus, we need to use
a physical IPI that broadcasts to all apics except BSP itself.
I think this is the only way to address all the cpus to wake up.
So, we need parallel smp init.
I am working on a branch to get this working but currently the remainder
of my patches hang the system occasionally, so I have not included any here.
Damien
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[PATCH 0/6 gnumach] Preparation for parallel SMP init
Damien Zammit
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[PATCH 1/6 gnumach] i386/cpuboot: Simplify for legibility
Damien Zammit
2024/12/09
Re: [PATCH 1/6 gnumach] i386/cpuboot: Simplify for legibility
Samuel Thibault
2024/12/09
[PATCH 2/6 gnumach] i386/cpuboot: Dont use CPU_NUMBER_NO_STACK() early
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Re: [PATCH 2/6 gnumach] i386/cpuboot: Dont use CPU_NUMBER_NO_STACK() early
Samuel Thibault
2024/12/09
[PATCH 3/6 gnumach] i386/cpuboot: Write gs selector correctly
Damien Zammit
2024/12/09
Re: [PATCH 3/6 gnumach] i386/cpuboot: Write gs selector correctly
Samuel Thibault
2024/12/09
[PATCH 4/6 gnumach] pmap: Separate temporary_mapping from set_page_dir
Damien Zammit
2024/12/09
Re: [PATCH 4/6 gnumach] pmap: Separate temporary_mapping from set_page_dir
Samuel Thibault
2024/12/09
[PATCH 5/6 gnumach] smp: Use logical destination not physical apic id
Damien Zammit
2024/12/09
Re: [PATCH 5/6 gnumach] smp: Use logical destination not physical apic id
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2024/12/09
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