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https://github.com/RGBCube/serenity
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25ea7461a0
A couple of things were changed: 1. Semantic changes - PCI segments are now called PCI domains, to better match what they are really. It's also the name that Linux gave, and it seems that Wikipedia also uses this name. We also remove PCI::ChangeableAddress, because it was used in the past but now it's no longer being used. 2. There are no WindowedMMIOAccess or MMIOAccess classes anymore, as they made a bunch of unnecessary complexity. Instead, Windowed access is removed entirely (this was tested, but never was benchmarked), so we are left with IO access and memory access options. The memory access option is essentially mapping the PCI bus (from the chosen PCI domain), to virtual memory as-is. This means that unless needed, at any time, there is only one PCI bus being mapped, and this is changed if access to another PCI bus in the same PCI domain is needed. For now, we don't support mapping of different PCI buses from different PCI domains at the same time, because basically it's still a non-issue for most machines out there. 2. OOM-safety is increased, especially when constructing the Access object. It means that we pre-allocating any needed resources, and we try to find PCI domains (if requested to initialize memory access) after we attempt to construct the Access object, so it's possible to fail at this point "gracefully". 3. All PCI API functions are now separated into a different header file, which means only "clients" of the PCI subsystem API will need to include that header file. 4. Functional changes - we only allow now to enumerate the bus after a hardware scan. This means that the old method "enumerate_hardware" is removed, so, when initializing an Access object, the initializing function must call rescan on it to force it to find devices. This makes it possible to fail rescan, and also to defer it after construction from both OOM-safety terms and hotplug capabilities.
78 lines
1.9 KiB
C++
78 lines
1.9 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/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/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").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::MemoryAddressing: {
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auto success = Access::initialize_for_memory_access(ACPI::Parser::the()->find_table("MCFG"));
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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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