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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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20 changed files with 878 additions and 16 deletions
62
Kernel/PCI/Access.h
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62
Kernel/PCI/Access.h
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#pragma once
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#include <AK/String.h>
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#include <Kernel/PCI/Definitions.h>
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class PCI::Access {
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public:
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virtual void enumerate_all(Function<void(Address, ID)>&) = 0;
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virtual u8 get_interrupt_line(Address address) { return read8_field(address, PCI_INTERRUPT_LINE); }
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virtual u32 get_BAR0(Address address) { return read32_field(address, PCI_BAR0); }
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virtual u32 get_BAR1(Address address) { return read32_field(address, PCI_BAR1); }
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virtual u32 get_BAR2(Address address) { return read32_field(address, PCI_BAR2); }
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virtual u32 get_BAR3(Address address) { return read32_field(address, PCI_BAR3); }
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virtual u32 get_BAR4(Address address) { return read32_field(address, PCI_BAR4); }
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virtual u32 get_BAR5(Address address) { return read32_field(address, PCI_BAR5); }
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virtual u32 get_BAR_Space_Size(Address address, u8 bar_number)
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{
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// See PCI Spec 2.3, Page 222
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ASSERT(bar_number < 6);
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u8 field = (PCI_BAR0 + (bar_number << 2));
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u32 bar_reserved = read32_field(address, field);
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write32_field(address, field, 0xFFFFFFFF);
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u32 space_size = read32_field(address, field);
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write32_field(address, field, bar_reserved);
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space_size &= 0xfffffff0;
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space_size = (~space_size) + 1;
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return space_size;
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}
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virtual u8 get_revision_id(Address address) { return read8_field(address, PCI_REVISION_ID); }
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virtual u8 get_subclass(Address address) { return read8_field(address, PCI_SUBCLASS); }
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virtual u8 get_class(Address address) { return read8_field(address, PCI_CLASS); }
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virtual u16 get_subsystem_id(Address address) { return read16_field(address, PCI_SUBSYSTEM_ID); }
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virtual u16 get_subsystem_vendor_id(Address address) { return read16_field(address, PCI_SUBSYSTEM_VENDOR_ID); }
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virtual u16 read_type(Address address) { return (read8_field(address, PCI_CLASS) << 8u) | read8_field(address, PCI_SUBCLASS); }
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virtual void enable_bus_mastering(Address) final;
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virtual void disable_bus_mastering(Address) final;
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virtual void enumerate_bus(int type, u8 bus, Function<void(Address, ID)>&) final;
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virtual void enumerate_functions(int type, u8 bus, u8 slot, u8 function, Function<void(Address, ID)>& callback) final;
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virtual void enumerate_slot(int type, u8 bus, u8 slot, Function<void(Address, ID)>& callback) final;
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static Access& the();
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static bool is_initialized();
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virtual uint32_t get_segments_count() = 0;
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virtual uint8_t get_segment_start_bus(u32 segment) = 0;
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virtual uint8_t get_segment_end_bus(u32 segment) = 0;
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virtual String get_access_type() = 0;
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protected:
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Access();
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virtual u8 read8_field(Address address, u32 field) = 0;
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virtual u16 read16_field(Address address, u32 field) = 0;
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virtual u32 read32_field(Address address, u32 field) = 0;
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virtual void write8_field(Address address, u32 field, u8 value) = 0;
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virtual void write16_field(Address address, u32 field, u16 value) = 0;
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virtual void write32_field(Address address, u32 field, u32 value) = 0;
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};
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