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75 lines
1.8 KiB
C++
75 lines
1.8 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/ACPI/Parser.h>
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#include <Kernel/CommandLine.h>
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#include <Kernel/IO.h>
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#include <Kernel/PCI/IOAccess.h>
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#include <Kernel/PCI/Initializer.h>
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#include <Kernel/PCI/MMIOAccess.h>
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#include <Kernel/PCI/WindowedMMIOAccess.h>
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#include <Kernel/Panic.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").is_null())
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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::MappingPerDevice:
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WindowedMMIOAccess::initialize(ACPI::Parser::the()->find_table("MCFG"));
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break;
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case PCIAccessLevel::MappingPerBus:
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MMIOAccess::initialize(ACPI::Parser::the()->find_table("MCFG"));
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break;
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case PCIAccessLevel::IOAddressing:
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IOAccess::initialize();
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break;
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default:
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VERIFY_NOT_REACHED();
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}
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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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