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Kernel: Change PCI access commandline option to also represent no access

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This change allow the user to request the kernel to not use any PCI
resources/devices at all.

Also, don't try to initialize devices that rely on PCI if disabled.
This commit is contained in:
Liav A 2022-01-21 16:09:05 +02:00 • committed by Andreas Kling
parent 6bf59cbb1b
commit f6e635938f
5 changed files with 25 additions and 8 deletions
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13
Kernel/CommandLine.cpp
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@ -142,14 +142,21 @@ UNMAP_AFTER_INIT bool CommandLine::is_vmmouse_enabled() const
UNMAP_AFTER_INIT PCIAccessLevel CommandLine::pci_access_level() const
{
auto value = lookup("pci_ecam"sv).value_or("on"sv);
if (value == "on"sv)
auto value = lookup("pci"sv).value_or("ecam"sv);
if (value == "ecam"sv)
return PCIAccessLevel::MemoryAddressing;
if (value == "off"sv)
if (value == "io"sv)
return PCIAccessLevel::IOAddressing;
if (value == "none"sv)
return PCIAccessLevel::None;
PANIC("Unknown PCI ECAM setting: {}", value);
}
UNMAP_AFTER_INIT bool CommandLine::is_pci_disabled() const
{
return lookup("pci"sv).value_or("ecam"sv) == "none"sv;
}
UNMAP_AFTER_INIT bool CommandLine::is_legacy_time_enabled() const
{
return lookup("time"sv).value_or("modern"sv) == "legacy"sv;