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[metal] Add a uprintf() routine, for non-emergency boot logging #905

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merged 4 commits into from
Oct 25, 2023
Merged

[metal] Add a uprintf() routine, for non-emergency boot logging #905

merged 4 commits into from
Oct 25, 2023

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tkchia
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@tkchia tkchia commented Oct 7, 2023

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@tkchia tkchia mentioned this pull request Oct 7, 2023
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tkchia commented Oct 7, 2023 •
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I am proposing to add a uprintf() routine which kind of works like kprintf() but — on bare metal — is more suited for non-emergency informational messages.

Currently, on bare metal with VGA, kprintf() is very crash-proof and does not need to dynamically allocate memory for a video "back buffer", but this makes it extremely slow when it needs to scroll the screen (on a real PC). The proposed uprintf() routine works faster, at the expense of being less crash-proof.

Thank you!

@tkchia tkchia marked this pull request as ready for review October 7, 2023 19:40
jart
jart requested changes Oct 25, 2023
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libc/intrin/kprintf.h Show resolved Hide resolved
tkchia added 4 commits October 25, 2023 20:55
[metal] Add a uprintf() routine, for non-emergency boot logging
e686585
[metal] _Really_ push forward timing of VGA TTY initialization
0364ec2
[metal] Do something useful with uprintf()
9f6fdf9
[metal] Locate some ACPI tables, for later hardware detection
84dfeb5 
Specifically the code now tries to find the ACPI RSDP,
RSDT/XSDT, FADT, & MADT tables, whether in legacy BIOS
bootup mode or in a UEFI bootup.  These are useful for
figuring out how to (re)enable asynchronous interrupts
in legacy 8259 PIC mode.
@tkchia tkchia requested a review from jart October 25, 2023 21:11
@jart jart merged commit ed17d30 into jart:master Oct 25, 2023
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G4Vi pushed a commit to G4Vi/cosmopolitan that referenced this pull request Jan 19, 2024
@tkchia @G4Vi
[metal] Add a uprintf() routine, for non-emergency boot logging (jart…
add8edc 
…#905)

* [metal] Add a uprintf() routine, for non-emergency boot logging
* [metal] _Really_ push forward timing of VGA TTY initialization
* [metal] Do something useful with uprintf()
* [metal] Locate some ACPI tables, for later hardware detection

Specifically the code now tries to find the ACPI RSDP,
RSDT/XSDT, FADT, & MADT tables, whether in legacy BIOS
bootup mode or in a UEFI bootup.  These are useful for
figuring out how to (re)enable asynchronous interrupts
in legacy 8259 PIC mode.
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@jart jart jart approved these changes

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@tkchia @jart