mirror of
https://github.com/RGBCube/serenity
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9132596b8e
This will somwhat help unify them also under the same SysFS directory in the commit. Also, it feels much more like this change reflects the reality that both ACPI and the BIOS are part of the firmware on x86 computers.
80 lines
2 KiB
C++
80 lines
2 KiB
C++
/*
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* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Bus/PCI/API.h>
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#include <Kernel/Bus/PCI/Access.h>
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#include <Kernel/Bus/PCI/Initializer.h>
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#include <Kernel/Bus/PCI/SysFSPCI.h>
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#include <Kernel/CommandLine.h>
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#include <Kernel/Firmware/ACPI/Parser.h>
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#include <Kernel/IO.h>
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#include <Kernel/Panic.h>
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#include <Kernel/Sections.h>
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namespace Kernel {
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namespace PCI {
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static bool test_pci_io();
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UNMAP_AFTER_INIT static PCIAccessLevel detect_optimal_access_type(PCIAccessLevel boot_determined)
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{
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if (!ACPI::is_enabled() || !ACPI::Parser::the()->find_table("MCFG").has_value())
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return PCIAccessLevel::IOAddressing;
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if (boot_determined != PCIAccessLevel::IOAddressing)
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return boot_determined;
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if (test_pci_io())
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return PCIAccessLevel::IOAddressing;
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PANIC("No PCI bus access method detected!");
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}
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UNMAP_AFTER_INIT void initialize()
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{
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auto boot_determined = kernel_command_line().pci_access_level();
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switch (detect_optimal_access_type(boot_determined)) {
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case PCIAccessLevel::MemoryAddressing: {
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auto mcfg = ACPI::Parser::the()->find_table("MCFG");
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VERIFY(mcfg.has_value());
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auto success = Access::initialize_for_memory_access(mcfg.value());
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VERIFY(success);
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break;
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}
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case PCIAccessLevel::IOAddressing: {
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auto success = Access::initialize_for_io_access();
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VERIFY(success);
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break;
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}
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default:
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VERIFY_NOT_REACHED();
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}
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PCI::PCIBusSysFSDirectory::initialize();
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PCI::enumerate([&](const Address& address, ID id) {
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dmesgln("{} {}", address, id);
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});
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}
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UNMAP_AFTER_INIT bool test_pci_io()
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{
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dmesgln("Testing PCI via manual probing...");
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u32 tmp = 0x80000000;
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IO::out32(PCI_ADDRESS_PORT, tmp);
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tmp = IO::in32(PCI_ADDRESS_PORT);
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if (tmp == 0x80000000) {
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dmesgln("PCI IO supported");
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return true;
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}
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dmesgln("PCI IO not supported");
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return false;
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}
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}
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}
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