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Kernel: Create support for PCI ECAM

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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.
This commit is contained in:
Liav A 2019-12-31 13:04:30 +02:00 • committed by Andreas Kling
parent d85874be4b
commit e5ffa960d7
20 changed files with 878 additions and 16 deletions
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62
Kernel/PCI/Access.h Normal file
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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); }
virtual u32 get_BAR_Space_Size(Address address, u8 bar_number)
{
// 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;
}
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;
};