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8abbb7e090
Now the kernel supports 2 ECAM access methods. MMIOAccess was renamed to WindowedMMIOAccess and is what we had until now - each device that is detected on boot is assigned to a memory-mapped window, so IO operations on multiple devices can occur simultaneously due to creating multiple virtual mappings, hence the name is a memory-mapped window. This commit adds a new class called MMIOAccess (not to be confused with the old MMIOAccess class). This class creates one memory-mapped window. On each IO operation on a configuration space of a device, it maps the requested PCI bus region to that window. Therefore it holds a SpinLock during the operation to ensure that no other PCI bus region was mapped during the call. A user can choose to either use PCI ECAM with memory-mapped window for each device, or for an entire bus. By default, the kernel prefers to map the entire PCI bus region.
94 lines
3.1 KiB
C++
94 lines
3.1 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/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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