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serenity/Kernel/PCI/Access.h

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Meta: Add license header to source files As suggested by Joshua, this commit adds the 2-clause BSD license as a comment block to the top of every source file. For the first pass, I've just added myself for simplicity. I encourage everyone to add themselves as copyright holders of any file they've added or modified in some significant way. If I've added myself in error somewhere, feel free to replace it with the appropriate copyright holder instead. Going forward, all new source files should include a license header.
2020-01-18 09:38:21 +01:00
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
Kernel: Create support for PCI ECAM 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.
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#pragma once
#include <AK/String.h>
#include <Kernel/PCI/Definitions.h>
class PCI::Access {
public:
virtual void enumerate_all(Function<void(Address, ID)>&) = 0;
virtual u8 get_interrupt_line(Address address) { return read8_field(address, PCI_INTERRUPT_LINE); }
virtual u32 get_BAR0(Address address) { return read32_field(address, PCI_BAR0); }
virtual u32 get_BAR1(Address address) { return read32_field(address, PCI_BAR1); }
virtual u32 get_BAR2(Address address) { return read32_field(address, PCI_BAR2); }
virtual u32 get_BAR3(Address address) { return read32_field(address, PCI_BAR3); }
virtual u32 get_BAR4(Address address) { return read32_field(address, PCI_BAR4); }
virtual u32 get_BAR5(Address address) { return read32_field(address, PCI_BAR5); }
Kernel: Remove problematic memory mapping methods mmap() & mmap_region() methods are removed from ACPI & DMI components, and we replace them with the new MM.allocate_kernel_region() helper. Instead of doing a raw calculation for each VM address, from now on we can use helper functions to do perform those calculations in a neat, reusable and readable way.
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virtual size_t get_BAR_Space_Size(Address address, u8 bar_number)
Kernel: Create support for PCI ECAM 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.
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{
// See PCI Spec 2.3, Page 222
ASSERT(bar_number < 6);
u8 field = (PCI_BAR0 + (bar_number << 2));
u32 bar_reserved = read32_field(address, field);
write32_field(address, field, 0xFFFFFFFF);
u32 space_size = read32_field(address, field);
write32_field(address, field, bar_reserved);
space_size &= 0xfffffff0;
space_size = (~space_size) + 1;
return space_size;
}
Kernel: Detect devices when enumerating the PCI bus Instead of making each driver to enumerate the PCI bus itself, PCI::Initializer will call detect_devices() to do one enumeration of the bus.
2020-02-02 01:52:51 +02:00
virtual ID get_id(Address address) final;
Kernel: Create support for PCI ECAM 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.
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virtual u8 get_revision_id(Address address) { return read8_field(address, PCI_REVISION_ID); }
virtual u8 get_subclass(Address address) { return read8_field(address, PCI_SUBCLASS); }
virtual u8 get_class(Address address) { return read8_field(address, PCI_CLASS); }
virtual u16 get_subsystem_id(Address address) { return read16_field(address, PCI_SUBSYSTEM_ID); }
virtual u16 get_subsystem_vendor_id(Address address) { return read16_field(address, PCI_SUBSYSTEM_VENDOR_ID); }
virtual u16 read_type(Address address) { return (read8_field(address, PCI_CLASS) << 8u) | read8_field(address, PCI_SUBCLASS); }
virtual void enable_bus_mastering(Address) final;
virtual void disable_bus_mastering(Address) final;
virtual void enumerate_bus(int type, u8 bus, Function<void(Address, ID)>&) final;
virtual void enumerate_functions(int type, u8 bus, u8 slot, u8 function, Function<void(Address, ID)>& callback) final;
virtual void enumerate_slot(int type, u8 bus, u8 slot, Function<void(Address, ID)>& callback) final;
static Access& the();
static bool is_initialized();
virtual uint32_t get_segments_count() = 0;
virtual uint8_t get_segment_start_bus(u32 segment) = 0;
virtual uint8_t get_segment_end_bus(u32 segment) = 0;
virtual String get_access_type() = 0;
protected:
Access();
virtual u8 read8_field(Address address, u32 field) = 0;
virtual u16 read16_field(Address address, u32 field) = 0;
virtual u32 read32_field(Address address, u32 field) = 0;
virtual void write8_field(Address address, u32 field, u8 value) = 0;
virtual void write16_field(Address address, u32 field, u16 value) = 0;
virtual void write32_field(Address address, u32 field, u32 value) = 0;
};
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