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Kernel: Introduce the ACPI subsystem

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ACPI subsystem includes 3 types of parsers that are created during
runtime, each one capable of parsing ACPI tables at different level.

ACPIParser is the most basic parser which is essentialy a parser that
can't parse anything useful, due to a user request to disable ACPI
support in a kernel boot parameter.

ACPIStaticParser is a derived class from ACPIParser, which is able to
parse only static data (e.g. FADT, HPET, MCFG and other tables), thus
making it not able to parse AML (ACPI Machine Language) nor to support
handling of hardware events and power management. This type of parser
can be created with a kernel boot parameter.

ACPIDynamicParser is a derived class from ACPIStaticParser, which
includes all the capabilities of the latter, but *should* implement an
AML interpretation, (by building the ACPI AML namespace) and handling
power & hardware events. Currently the methods to support AML
interpretation are not implemented.
This type of parser is created automatically during runtime if the user
didn't specify a boot parameter related to ACPI initialization.

Also, adding strncmp function definition in StdLib.h, to be able to use
it in ACPIStaticParser class.
This commit is contained in:
Liav A 2019-12-31 13:01:09 +02:00 • committed by Andreas Kling
parent 331f37d1a8
commit 1e1a6a57ed
8 changed files with 894 additions and 0 deletions
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42
Kernel/ACPI/ACPIStaticParser.h Normal file
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#pragma once
#include <ACPI/ACPIParser.h>
#include <AK/OwnPtr.h>
class ACPIStaticParser : ACPIParser {
public:
static void initialize(ACPI_RAW::RSDPDescriptor20& rsdp);
static void initialize_without_rsdp();
static bool is_initialized();
virtual ACPI_RAW::SDTHeader* find_table(const char* sig) override;
virtual void do_acpi_reboot() override;
virtual void do_acpi_shutdown() override;
virtual bool is_operable() override { return m_operable; }
protected:
ACPIStaticParser();
explicit ACPIStaticParser(ACPI_RAW::RSDPDescriptor20&);
virtual void mmap(VirtualAddress preferred_vaddr, PhysicalAddress paddr, u32) override;
virtual void mmap_region(Region& region, PhysicalAddress paddr) override;
private:
void locate_static_data();
void locate_all_aml_tables();
void locate_main_system_description_table();
void initialize_main_system_description_table();
ACPI_RAW::SDTHeader& find_fadt();
void init_fadt();
ACPI_RAW::RSDPDescriptor20* search_rsdp();
// Early pointers that are needed really for initializtion only...
ACPI_RAW::RSDPDescriptor20* m_rsdp;
ACPI_RAW::SDTHeader* m_main_system_description_table;
OwnPtr<ACPI::MainSystemDescriptionTable> m_main_sdt;
OwnPtr<ACPI::FixedACPIData> m_fadt;
Vector<ACPI_RAW::SDTHeader*> m_aml_tables_ptrs;
bool m_xsdt_supported;
};