mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-07-13 06:29:11 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

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

Browse source 
* [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
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
25 changed files with 999 additions and 36 deletions
Download patch file Download diff file Expand all files Collapse all files

80
libc/irq/acpi-fadt.c Normal file
View file

@ -0,0 +1,80 @@
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ This is free and unencumbered software released into the public domain. │
│ │
│ Anyone is free to copy, modify, publish, use, compile, sell, or │
│ distribute this software, either in source code form or as a compiled │
│ binary, for any purpose, commercial or non-commercial, and by any │
│ means. │
│ │
│ In jurisdictions that recognize copyright laws, the author or authors │
│ of this software dedicate any and all copyright interest in the │
│ software to the public domain. We make this dedication for the benefit │
│ of the public at large and to the detriment of our heirs and │
│ successors. We intend this dedication to be an overt act of │
│ relinquishment in perpetuity of all present and future rights to this │
│ software under copyright law. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, │
│ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF │
│ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. │
│ IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR │
│ OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, │
│ ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR │
│ OTHER DEALINGS IN THE SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/dce.h"
#include "libc/intrin/kprintf.h"
#include "libc/irq/acpi.internal.h"
#ifdef __x86_64__
textstartup static void _AcpiDsdtInit(uintptr_t dsdt_phy) {
const AcpiTableDsdt *dsdt;
size_t length;
if (!dsdt_phy) {
KWARNF("FADT: no DSDT");
return;
}
dsdt = _AcpiMapTable(dsdt_phy);
KINFOF("FADT: DSDT @ %p", dsdt);
length = dsdt->Header.Length;
if (length <= offsetof(AcpiTableDsdt, Aml)) {
KWARNF("DSDT: no AML?");
return;
}
/* TODO: parse AML to discover hardware configuration */
}
textstartup void _AcpiFadtInit(void) {
if (IsMetal()) {
const AcpiTableFadt *fadt;
size_t length;
uint16_t flags;
uintptr_t dsdt_phy = 0;
if (!_AcpiSuccess(_AcpiGetTable("FACP", 0, (void **)&fadt))) {
KINFOF("no FADT found");
return;
}
length = fadt->Header.Length;
KINFOF("FADT @ %p,+%#zx", fadt, length);
_Static_assert(offsetof(AcpiTableFadt, Dsdt) == 40);
_Static_assert(offsetof(AcpiTableFadt, BootFlags) == 109);
_Static_assert(offsetof(AcpiTableFadt, XDsdt) == 140);
if (length >= offsetof(AcpiTableFadt, BootFlags) + sizeof(fadt->BootFlags))
{
_AcpiBootFlags = flags = fadt->BootFlags;
KINFOF("FADT: boot flags %#x", (unsigned)flags);
}
if (length >= offsetof(AcpiTableFadt, XDsdt) + sizeof(fadt->XDsdt) &&
fadt->XDsdt) {
dsdt_phy = fadt->XDsdt;
} else if (length >= offsetof(AcpiTableFadt, Dsdt) + sizeof(fadt->Dsdt)) {
dsdt_phy = fadt->Dsdt;
}
_AcpiDsdtInit(dsdt_phy);
}
}
#endif /* __x86_64__ */