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PCI: Add list of capabilities for each device during first enumeration

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This commit is contained in:
Liav A 2020-12-18 17:37:51 +02:00 • committed by Andreas Kling
parent 9d10eb473d
commit 85b4256d10
4 changed files with 44 additions and 3 deletions
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24
Kernel/PCI/Access.cpp
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@ -129,6 +129,30 @@ void enumerate(Function<void(Address, ID)> callback)
Access::the().enumerate(callback);
}
Optional<u8> get_capabilities_pointer(Address address)
{
if (PCI::read16(address, PCI_STATUS) & (1 << 4)) {
return PCI::read8(address, PCI_CAPABILITIES_POINTER);
}
return {};
}
Vector<Capability> get_capabilities(Address address)
{
auto capabilities_pointer = PCI::get_capabilities_pointer(address);
if (!capabilities_pointer.has_value())
return {};
Vector<Capability> capabilities;
auto capability_pointer = capabilities_pointer.value();
while (capability_pointer != 0) {
u16 capability_header = PCI::read16(address, capability_pointer);
u8 capability_id = capability_header & 0xff;
capability_pointer = capability_header >> 8;
capabilities.append({ capability_id, capability_pointer });
}
return capabilities;
}
void raw_access(Address address, u32 field, size_t access_size, u32 value)
{
ASSERT(access_size != 0);