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Kernel: Create support for PCI ECAM

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The new PCI subsystem is initialized during runtime.
PCI::Initializer is supposed to be called during early boot, to
perform a few tests, and initialize the proper configuration space
access mechanism. Kernel boot parameters can be specified by a user to
determine what tests will occur, to aid debugging on problematic
machines.
After that, PCI::Initializer should be dismissed.

PCI::IOAccess is a class that is derived from PCI::Access
class and implements PCI configuration space access mechanism via x86
IO ports.
PCI::MMIOAccess is a class that is derived from PCI::Access
and implements PCI configurtaion space access mechanism via memory
access.

The new PCI subsystem also supports determination of IO/MMIO space
needed by a device by checking a given BAR.
In addition, Every device or component that use the PCI subsystem has
changed to match the last changes.
This commit is contained in:
Liav A 2019-12-31 13:04:30 +02:00 • committed by Andreas Kling
parent d85874be4b
commit e5ffa960d7
20 changed files with 878 additions and 16 deletions
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22
Kernel/PCI/Initializer.h Normal file
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#pragma once
#include <AK/Types.h>
#include <Kernel/ACPI/Definitions.h>
#include <Kernel/PCI/Definitions.h>
class PCI::Initializer {
public:
static PCI::Initializer& the();
void initialize_pci_mmio_access(ACPI_RAW::MCFG& mcfg);
void initialize_pci_io_access();
void test_and_initialize(bool disable_pci_mmio, bool pci_force_probing);
static void dismiss();
private:
~Initializer();
Initializer();
bool test_acpi();
bool test_pci_io(bool pci_force_probing);
bool test_pci_mmio();
void initialize_pci_mmio_access_after_test();
};