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

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* [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.
This commit is contained in:
tkchia 2023-10-26 05:32:20 +08:00 • committed by GitHub
parent 062b2d776e
commit ed17d3008b
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25 changed files with 999 additions and 36 deletions
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4
libc/vga/rlinit-init-vga.S
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@ -91,12 +91,12 @@
vga_console:
.endobj vga_console,globl,hidden
.previous
.init.start 305,_init_vga
.init.start 101,_init_vga
push %rdi
push %rsi
call _vga_init
pop %rsi
pop %rdi
.init.end 305,_init_vga
.init.end 101,_init_vga
.yoink sys_writev_vga
.yoink sys_readv_vga