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6131048a5f
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.
83 lines
3.2 KiB
C++
83 lines
3.2 KiB
C++
/*
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* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/HashMap.h>
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#include <AK/NonnullOwnPtrVector.h>
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#include <AK/OwnPtr.h>
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#include <AK/Types.h>
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#include <Kernel/ACPI/Definitions.h>
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#include <Kernel/PCI/Access.h>
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#include <Kernel/VM/AnonymousVMObject.h>
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#include <Kernel/VM/PhysicalRegion.h>
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#include <Kernel/VM/Region.h>
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#include <Kernel/VM/VMObject.h>
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namespace Kernel {
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namespace PCI {
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class DeviceConfigurationSpaceMapping {
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public:
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DeviceConfigurationSpaceMapping(Address, const MMIOSegment&);
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VirtualAddress vaddr() const { return m_mapped_region->vaddr(); };
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PhysicalAddress paddr() const { return m_mapped_region->physical_page(0)->paddr(); }
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const Address& address() const { return m_device_address; };
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private:
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Address m_device_address;
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NonnullOwnPtr<Region> m_mapped_region;
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};
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class MMIOAccess final : public Access {
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public:
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static void initialize(PhysicalAddress mcfg);
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protected:
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explicit MMIOAccess(PhysicalAddress mcfg);
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private:
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virtual const char* access_type() const override { return "MMIO-Access"; };
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virtual u32 segment_count() const override;
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virtual void enumerate_hardware(Function<void(Address, ID)>) override;
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virtual void write8_field(Address address, u32, u8) override;
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virtual void write16_field(Address address, u32, u16) override;
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virtual void write32_field(Address address, u32, u32) override;
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virtual u8 read8_field(Address address, u32) override;
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virtual u16 read16_field(Address address, u32) override;
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virtual u32 read32_field(Address address, u32) override;
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Optional<VirtualAddress> get_device_configuration_space(Address address);
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virtual u8 segment_start_bus(u32) const override;
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virtual u8 segment_end_bus(u32) const override;
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PhysicalAddress m_mcfg;
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HashMap<u16, MMIOSegment> m_segments;
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NonnullOwnPtrVector<DeviceConfigurationSpaceMapping> m_mapped_device_regions;
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};
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}
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}
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