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Kernel: Map PCI devices only once during boot

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Instead of mapping a 4KB region to access device configuration space
each time we call one of the PCI helpers, just map them once during
the boot process.
Then, if we request to access one of those devices, we can ask the
PCI subsystem to give us the virtual address where the device's
configuration space is mapped.
This commit is contained in:
Liav A 2020-10-31 22:24:01 +02:00 • committed by Andreas Kling
parent 0aeef47abd
commit 6131048a5f
4 changed files with 95 additions and 60 deletions
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18
Kernel/PCI/MMIOAccess.h
View file

@ -27,6 +27,7 @@
#pragma once
#include <AK/HashMap.h>
#include <AK/NonnullOwnPtrVector.h>
#include <AK/OwnPtr.h>
#include <AK/Types.h>
#include <Kernel/ACPI/Definitions.h>
@ -39,6 +40,18 @@
namespace Kernel {
namespace PCI {
class DeviceConfigurationSpaceMapping {
public:
DeviceConfigurationSpaceMapping(Address, const MMIOSegment&);
VirtualAddress vaddr() const { return m_mapped_region->vaddr(); };
PhysicalAddress paddr() const { return m_mapped_region->physical_page(0)->paddr(); }
const Address& address() const { return m_device_address; };
private:
Address m_device_address;
NonnullOwnPtr<Region> m_mapped_region;
};
class MMIOAccess final : public Access {
public:
static void initialize(PhysicalAddress mcfg);
@ -57,14 +70,13 @@ private:
virtual u16 read16_field(Address address, u32) override;
virtual u32 read32_field(Address address, u32) override;
void map_device(Address address);
Optional<VirtualAddress> get_device_configuration_space(Address address);
virtual u8 segment_start_bus(u32) const override;
virtual u8 segment_end_bus(u32) const override;
PhysicalAddress m_mcfg;
HashMap<u16, MMIOSegment> m_segments;
OwnPtr<Region> m_mmio_window_region;
ChangeableAddress m_mapped_address;
NonnullOwnPtrVector<DeviceConfigurationSpaceMapping> m_mapped_device_regions;
};
}