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https://github.com/jart/cosmopolitan.git
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ed17d3008b
* [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.
80 lines
4 KiB
C
80 lines
4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ This is free and unencumbered software released into the public domain. │
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│ │
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│ Anyone is free to copy, modify, publish, use, compile, sell, or │
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│ distribute this software, either in source code form or as a compiled │
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│ binary, for any purpose, commercial or non-commercial, and by any │
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│ means. │
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│ │
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│ In jurisdictions that recognize copyright laws, the author or authors │
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│ of this software dedicate any and all copyright interest in the │
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│ software to the public domain. We make this dedication for the benefit │
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│ of the public at large and to the detriment of our heirs and │
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│ successors. We intend this dedication to be an overt act of │
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│ relinquishment in perpetuity of all present and future rights to this │
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│ software under copyright law. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, │
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│ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF │
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│ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. │
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│ IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR │
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│ OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, │
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│ ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR │
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│ OTHER DEALINGS IN THE SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/dce.h"
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#include "libc/intrin/kprintf.h"
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#include "libc/irq/acpi.internal.h"
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#ifdef __x86_64__
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textstartup static void _AcpiDsdtInit(uintptr_t dsdt_phy) {
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const AcpiTableDsdt *dsdt;
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size_t length;
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if (!dsdt_phy) {
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KWARNF("FADT: no DSDT");
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return;
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}
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dsdt = _AcpiMapTable(dsdt_phy);
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KINFOF("FADT: DSDT @ %p", dsdt);
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length = dsdt->Header.Length;
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if (length <= offsetof(AcpiTableDsdt, Aml)) {
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KWARNF("DSDT: no AML?");
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return;
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}
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/* TODO: parse AML to discover hardware configuration */
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}
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textstartup void _AcpiFadtInit(void) {
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if (IsMetal()) {
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const AcpiTableFadt *fadt;
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size_t length;
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uint16_t flags;
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uintptr_t dsdt_phy = 0;
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if (!_AcpiSuccess(_AcpiGetTable("FACP", 0, (void **)&fadt))) {
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KINFOF("no FADT found");
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return;
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}
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length = fadt->Header.Length;
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KINFOF("FADT @ %p,+%#zx", fadt, length);
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_Static_assert(offsetof(AcpiTableFadt, Dsdt) == 40);
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_Static_assert(offsetof(AcpiTableFadt, BootFlags) == 109);
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_Static_assert(offsetof(AcpiTableFadt, XDsdt) == 140);
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if (length >= offsetof(AcpiTableFadt, BootFlags) + sizeof(fadt->BootFlags))
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{
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_AcpiBootFlags = flags = fadt->BootFlags;
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KINFOF("FADT: boot flags %#x", (unsigned)flags);
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}
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if (length >= offsetof(AcpiTableFadt, XDsdt) + sizeof(fadt->XDsdt) &&
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fadt->XDsdt) {
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dsdt_phy = fadt->XDsdt;
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} else if (length >= offsetof(AcpiTableFadt, Dsdt) + sizeof(fadt->Dsdt)) {
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dsdt_phy = fadt->Dsdt;
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}
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_AcpiDsdtInit(dsdt_phy);
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}
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}
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#endif /* __x86_64__ */
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