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Kernel/PCI: Don't use x86 initialization methods in non-x86 builds

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Using the IO address space is only relevant for x86 machines, so let's
not compile instructions to access the PCI configuration space when we
don't target x86 platforms.
This commit is contained in:
Liav A 2022-09-02 10:02:16 +03:00 committed by Linus Groh
parent 4555cac639
commit 0a220a413f
Notes: sideshowbarker 2024-07-17 06:48:27 +09:00 
Author: https://github.com/supercomputer7
Commit: https://github.com/SerenityOS/serenity/commit/0a220a413f
Pull-request: https://github.com/SerenityOS/serenity/pull/15173
Reviewed-by: https://github.com/linusg
3 changed files with 10 additions and 0 deletions
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6
Kernel/Bus/PCI/Initializer.cpp
View file

@ -23,6 +23,7 @@ static bool test_pci_io();
UNMAP_AFTER_INIT static PCIAccessLevel detect_optimal_access_type()
{
#if ARCH(I386) || ARCH(X86_64)
auto boot_determined = kernel_command_line().pci_access_level();
if (!ACPI::is_enabled() || !ACPI::Parser::the()->find_table("MCFG"sv).has_value())
return PCIAccessLevel::IOAddressing;
@ -32,6 +33,7 @@ UNMAP_AFTER_INIT static PCIAccessLevel detect_optimal_access_type()
if (!g_pci_access_io_probe_failed)
return PCIAccessLevel::IOAddressing;
#endif
PANIC("No PCI bus access method detected!");
}
@ -44,17 +46,21 @@ UNMAP_AFTER_INIT void initialize()
return;
switch (detect_optimal_access_type()) {
case PCIAccessLevel::MemoryAddressing: {
// FIXME: There are other arch-specific methods to find the memory range
// for accessing the PCI configuration space.
auto mcfg = ACPI::Parser::the()->find_table("MCFG"sv);
VERIFY(mcfg.has_value());
auto success = Access::initialize_for_multiple_pci_domains(mcfg.value());
VERIFY(success);
break;
}
#if ARCH(I386) || ARCH(X86_64)
case PCIAccessLevel::IOAddressing: {
auto success = Access::initialize_for_one_pci_domain();
VERIFY(success);
break;
}
#endif
default:
VERIFY_NOT_REACHED();
}

2
Kernel/CommandLine.cpp
View file

@ -149,8 +149,10 @@ UNMAP_AFTER_INIT PCIAccessLevel CommandLine::pci_access_level() const
auto value = lookup("pci"sv).value_or("ecam"sv);
if (value == "ecam"sv)
return PCIAccessLevel::MemoryAddressing;
#if ARCH(I386) || ARCH(X86_64)
if (value == "io"sv)
return PCIAccessLevel::IOAddressing;
#endif
if (value == "none"sv)
return PCIAccessLevel::None;
PANIC("Unknown PCI ECAM setting: {}", value);

2
Kernel/CommandLine.h
View file

@ -32,7 +32,9 @@ enum class AcpiFeatureLevel {
enum class PCIAccessLevel {
None,
#if ARCH(I386) || ARCH(X86_64)
IOAddressing,
#endif
MemoryAddressing,
};