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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.
81 lines
3.9 KiB
C
81 lines
3.9 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/inttypes.h"
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#include "libc/irq/acpi.internal.h"
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#ifdef __x86_64__
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textstartup void _AcpiMadtInit(void) {
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if (IsMetal()) {
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const AcpiTableMadt *madt;
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size_t length, num_io_apics = 0;
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const char *madt_end, *p;
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const AcpiSubtableHeader *h;
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const AcpiMadtIoApic **icp;
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uint32_t flags;
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if (!_AcpiSuccess(_AcpiGetTable("APIC", 0, (void **)&madt))) {
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KINFOF("no MADT found");
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return;
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}
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length = madt->Header.Length;
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if (length < sizeof(*madt)) {
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KDIEF("MADT has short length %#zx", length);
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}
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_AcpiMadtFlags = flags = madt->Flags;
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KINFOF("MADT @ %p, flags %#" PRIx32, madt, flags);
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madt_end = (char *)madt + length;
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p = madt->Subtable;
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while (p != madt_end) {
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h = (const AcpiSubtableHeader *)p;
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switch (h->Type) {
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case kAcpiMadtIoApic:
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++num_io_apics;
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}
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p += h->Length;
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}
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KINFOF("MADT: %zu I/O APIC(s)", num_io_apics);
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icp = _AcpiOsAllocate(num_io_apics * sizeof(const AcpiMadtIoApic *));
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if (icp) {
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_AcpiIoApics = icp;
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p = madt->Subtable;
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while (p != madt_end) {
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h = (const AcpiSubtableHeader *)p;
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switch (h->Type) {
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case kAcpiMadtIoApic:
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*icp++ = (const AcpiMadtIoApic *)p;
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}
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p += h->Length;
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}
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_AcpiNumIoApics = num_io_apics;
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} else {
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KWARNF("MADT: no memory for I/O APICs");
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}
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}
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}
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#endif /* __x86_64__ */
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