mirror of
https://github.com/SerenityOS/serenity
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81 lines
2.7 KiB
C++
81 lines
2.7 KiB
C++
/*
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* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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/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 Access::Type detect_optimal_access_type(bool mmio_allowed)
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{
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if (mmio_allowed && ACPI::is_enabled() && !ACPI::Parser::the()->find_table("MCFG").is_null())
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return Access::Type::MMIO;
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if (test_pci_io())
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return Access::Type::IO;
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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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bool mmio_allowed = kernel_command_line().is_mmio_enabled();
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if (detect_optimal_access_type(mmio_allowed) == Access::Type::MMIO)
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MMIOAccess::initialize(ACPI::Parser::the()->find_table("MCFG"));
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else
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IOAccess::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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