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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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53
Kernel/PCI/MMIOAccess.h Normal file
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#pragma once
#include <AK/HashMap.h>
#include <AK/OwnPtr.h>
#include <AK/Types.h>
#include <Kernel/ACPI/Definitions.h>
#include <Kernel/PCI/Access.h>
#include <Kernel/VM/PhysicalRegion.h>
#include <Kernel/VM/Region.h>
class PCI::MMIOAccess final : public PCI::Access {
public:
static void initialize(ACPI_RAW::MCFG&);
virtual void enumerate_all(Function<void(Address, ID)>&) override final;
virtual String get_access_type() override final { return "MMIO-Access"; };
protected:
MMIOAccess(ACPI_RAW::MCFG&);
private:
virtual u8 read8_field(Address address, u32) override final;
virtual u16 read16_field(Address address, u32) override final;
virtual u32 read32_field(Address address, u32) override final;
virtual void write8_field(Address address, u32, u8) override final;
virtual void write16_field(Address address, u32, u16) override final;
virtual void write32_field(Address address, u32, u32) override final;
void map_device(Address address);
void mmap(VirtualAddress preferred_vaddr, PhysicalAddress paddr, u32);
void mmap_region(Region& region, PhysicalAddress paddr);
virtual u32 get_segments_count();
virtual u8 get_segment_start_bus(u32);
virtual u8 get_segment_end_bus(u32);
ACPI_RAW::MCFG& m_mcfg;
HashMap<u16, MMIOSegment*>& m_segments;
OwnPtr<Region> m_mmio_segment;
};
class PCI::MMIOSegment {
public:
MMIOSegment(PhysicalAddress, u8, u8);
u8 get_start_bus();
u8 get_end_bus();
size_t get_size();
PhysicalAddress get_paddr();
private:
PhysicalAddress m_base_addr;
u8 m_start_bus;
u8 m_end_bus;
};