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Kernel: Simplify scanning BIOS/EBDA and MP parser initialization

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Add a MappedROM::find_chunk_starting_with() helper since that's a very
common usage pattern in clients of this code.

Also convert MultiProcessorParser from a persistent singleton object
to a temporary object constructed via a failable factory function.
This commit is contained in:
Andreas Kling 2020-05-22 13:34:53 +02:00
parent 84b7bc5e14
commit 4b847810bf
8 changed files with 47 additions and 101 deletions
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14
Kernel/ACPI/MultiProcessorParser.h
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@ -189,25 +189,21 @@ struct [[gnu::packed]] CompatibilityBusAddressSpaceModifierEntry
class PCIInterruptOverrideMetadata;
class MultiProcessorParser {
class MultiProcessorParser final {
public:
static MultiProcessorParser& the();
static OwnPtr<MultiProcessorParser> autodetect();
static bool is_initialized();
static void initialize();
Vector<PCIInterruptOverrideMetadata> get_pci_interrupt_redirections();
protected:
MultiProcessorParser();
private:
explicit MultiProcessorParser(PhysicalAddress floating_pointer);
void parse_configuration_table();
void parse_floating_pointer_data();
Vector<u8> get_pci_bus_ids() const;
PhysicalAddress search_floating_pointer();
PhysicalAddress search_floating_pointer_in_ebda();
PhysicalAddress search_floating_pointer_in_bios_area();
static Optional<PhysicalAddress> find_floating_pointer();
PhysicalAddress m_floating_pointer;
PhysicalAddress m_configuration_table;