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https://github.com/RGBCube/serenity
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8abbb7e090
Now the kernel supports 2 ECAM access methods. MMIOAccess was renamed to WindowedMMIOAccess and is what we had until now - each device that is detected on boot is assigned to a memory-mapped window, so IO operations on multiple devices can occur simultaneously due to creating multiple virtual mappings, hence the name is a memory-mapped window. This commit adds a new class called MMIOAccess (not to be confused with the old MMIOAccess class). This class creates one memory-mapped window. On each IO operation on a configuration space of a device, it maps the requested PCI bus region to that window. Therefore it holds a SpinLock during the operation to ensure that no other PCI bus region was mapped during the call. A user can choose to either use PCI ECAM with memory-mapped window for each device, or for an entire bus. By default, the kernel prefers to map the entire PCI bus region.
92 lines
3.3 KiB
C++
92 lines
3.3 KiB
C++
/*
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* Copyright (c) 2021, 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/SpinLock.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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#define PCI_MMIO_CONFIG_SPACE_SIZE 4096
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class MMIOAccess : public Access {
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public:
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class MMIOSegment {
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public:
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MMIOSegment(PhysicalAddress, u8, u8);
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u8 get_start_bus() const;
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u8 get_end_bus() const;
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size_t get_size() const;
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PhysicalAddress get_paddr() const;
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private:
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PhysicalAddress m_base_addr;
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u8 m_start_bus;
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u8 m_end_bus;
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};
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static void initialize(PhysicalAddress mcfg);
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private:
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PhysicalAddress determine_memory_mapped_bus_region(u32 segment, u8 bus) const;
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void map_bus_region(u32, u8);
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VirtualAddress get_device_configuration_space(Address address);
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SpinLock<u8> m_access_lock;
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u8 m_mapped_bus { 0 };
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OwnPtr<Region> m_mapped_region;
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protected:
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explicit MMIOAccess(PhysicalAddress mcfg);
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virtual const char* access_type() const override { return "MMIOAccess"; };
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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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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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};
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}
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}
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