mirror of
https://github.com/RGBCube/serenity
synced 2025-05-19 18:35:06 +00:00
1596ee241f
The simple PCI::HostBridge class implements access to the PCI configuration space by using x86 IO instructions. Therefore, it should be put in the Arch/x86/PCI directory so it can be easily omitted for non-x86 builds.
62 lines
2.2 KiB
C++
62 lines
2.2 KiB
C++
/*
|
|
* Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <Kernel/Arch/x86/IO.h>
|
|
#include <Kernel/Arch/x86/PCI/Controller/HostBridge.h>
|
|
#include <Kernel/Bus/PCI/Access.h>
|
|
#include <Kernel/Sections.h>
|
|
|
|
namespace Kernel::PCI {
|
|
|
|
NonnullOwnPtr<HostBridge> HostBridge::must_create_with_io_access()
|
|
{
|
|
PCI::Domain domain { 0, 0, 0xff };
|
|
return adopt_own_if_nonnull(new (nothrow) HostBridge(domain)).release_nonnull();
|
|
}
|
|
|
|
HostBridge::HostBridge(PCI::Domain const& domain)
|
|
: HostController(domain)
|
|
{
|
|
}
|
|
|
|
static u32 io_address_for_pci_field(BusNumber bus, DeviceNumber device, FunctionNumber function, u8 field)
|
|
{
|
|
return 0x80000000u | (bus.value() << 16u) | (device.value() << 11u) | (function.value() << 8u) | (field & 0xfc);
|
|
}
|
|
|
|
void HostBridge::write8_field(BusNumber bus, DeviceNumber device, FunctionNumber function, u32 field, u8 value)
|
|
{
|
|
IO::out32(PCI::address_port, io_address_for_pci_field(bus, device, function, field));
|
|
IO::out8(PCI::value_port + (field & 3), value);
|
|
}
|
|
void HostBridge::write16_field(BusNumber bus, DeviceNumber device, FunctionNumber function, u32 field, u16 value)
|
|
{
|
|
IO::out32(PCI::address_port, io_address_for_pci_field(bus, device, function, field));
|
|
IO::out16(PCI::value_port + (field & 2), value);
|
|
}
|
|
void HostBridge::write32_field(BusNumber bus, DeviceNumber device, FunctionNumber function, u32 field, u32 value)
|
|
{
|
|
IO::out32(PCI::address_port, io_address_for_pci_field(bus, device, function, field));
|
|
IO::out32(PCI::value_port, value);
|
|
}
|
|
|
|
u8 HostBridge::read8_field(BusNumber bus, DeviceNumber device, FunctionNumber function, u32 field)
|
|
{
|
|
IO::out32(PCI::address_port, io_address_for_pci_field(bus, device, function, field));
|
|
return IO::in8(PCI::value_port + (field & 3));
|
|
}
|
|
u16 HostBridge::read16_field(BusNumber bus, DeviceNumber device, FunctionNumber function, u32 field)
|
|
{
|
|
IO::out32(PCI::address_port, io_address_for_pci_field(bus, device, function, field));
|
|
return IO::in16(PCI::value_port + (field & 2));
|
|
}
|
|
u32 HostBridge::read32_field(BusNumber bus, DeviceNumber device, FunctionNumber function, u32 field)
|
|
{
|
|
IO::out32(PCI::address_port, io_address_for_pci_field(bus, device, function, field));
|
|
return IO::in32(PCI::value_port);
|
|
}
|
|
|
|
}
|