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Kernel/PCI: Move IO based HostBridge code to x86 arch-specific directory

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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.
This commit is contained in:
Liav A
2022-09-02 13:41:48 +03:00
committed by Linus Groh
parent a02c9c9569
commit 1596ee241f
Notes: sideshowbarker 2024-07-17 10:16:43 +09:00 
Author: https://github.com/supercomputer7
Commit: https://github.com/SerenityOS/serenity/commit/1596ee241f
Pull-request: https://github.com/SerenityOS/serenity/pull/15173
Reviewed-by: https://github.com/linusg
9 changed files with 113 additions and 90 deletions
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62
Kernel/Arch/x86/PCI/Controller/HostBridge.cpp Normal file
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/*
* 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);
}
}