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/*
* Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/ByteReader.h>
#include <AK/Platform.h>
#include <AK/Types.h>
#if ARCH(X86_64)
# include <Kernel/Arch/x86_64/IO.h>
#endif
#include <Kernel/Bus/PCI/Definitions.h>
#include <Kernel/Memory/TypedMapping.h>
#include <Kernel/PhysicalAddress.h>
namespace Kernel {
class IOWindow {
public:
enum class SpaceType {
#if ARCH(X86_64)
IO,
#endif
Memory,
};
SpaceType space_type() const { return m_space_type; }
#if ARCH(X86_64)
static ErrorOr<NonnullOwnPtr<IOWindow>> create_for_io_space(IOAddress, u64 space_length);
#endif
static ErrorOr<NonnullOwnPtr<IOWindow>> create_for_pci_device_bar(PCI::DeviceIdentifier const&, PCI::HeaderType0BaseRegister, u64 space_length);
static ErrorOr<NonnullOwnPtr<IOWindow>> create_for_pci_device_bar(PCI::DeviceIdentifier const&, PCI::HeaderType0BaseRegister);
ErrorOr<NonnullOwnPtr<IOWindow>> create_from_io_window_with_offset(u64 offset, u64 space_length);
ErrorOr<NonnullOwnPtr<IOWindow>> create_from_io_window_with_offset(u64 offset);
u8 read8(u64 offset);
u16 read16(u64 offset);
u32 read32(u64 offset);
void write8(u64 offset, u8);
void write16(u64 offset, u16);
void write32(u64 offset, u32);
// Note: These methods are useful in exceptional cases where we need to do unaligned
// access. This mostly happens on emulators and hypervisors (such as VMWare) because they don't enforce aligned access
// to IO and sometimes even require such access, so we have to use these functions.
void write32_unaligned(u64 offset, u32);
u32 read32_unaligned(u64 offset);
bool operator==(IOWindow const& other) const = delete;
bool operator!=(IOWindow const& other) const = delete;
bool operator>(IOWindow const& other) const = delete;
bool operator>=(IOWindow const& other) const = delete;
bool operator<(IOWindow const& other) const = delete;
bool operator<=(IOWindow const& other) const = delete;
~IOWindow();
PhysicalAddress as_physical_memory_address() const;
#if ARCH(X86_64)
IOAddress as_io_address() const;
#endif
private:
explicit IOWindow(NonnullOwnPtr<Memory::TypedMapping<u8 volatile>>);
u8 volatile* as_memory_address_pointer();
#if ARCH(X86_64)
struct IOAddressData {
public:
IOAddressData(u64 address, u64 space_length)
: m_address(address)
, m_space_length(space_length)
{
}
u64 address() const { return m_address; }
u64 space_length() const { return m_space_length; }
private:
u64 m_address { 0 };
u64 m_space_length { 0 };
};
explicit IOWindow(NonnullOwnPtr<IOAddressData>);
#endif
bool is_access_in_range(u64 offset, size_t byte_size_access) const;
bool is_access_aligned(u64 offset, size_t byte_size_access) const;
template<typename T>
ALWAYS_INLINE void in(u64 start_offset, T& data)
{
#if ARCH(X86_64)
if (m_space_type == SpaceType::IO) {
data = as_io_address().offset(start_offset).in<T>();
return;
}
#endif
VERIFY(m_space_type == SpaceType::Memory);
VERIFY(m_memory_mapped_range);
// Note: For memory-mapped IO we simply never allow unaligned access as it
// can cause problems with strict bare metal hardware. For example, some XHCI USB controllers
// might completely lock up because of an unaligned memory access to their registers.
VERIFY((start_offset % sizeof(T)) == 0);
data = *(T volatile*)(as_memory_address_pointer() + start_offset);
}
template<typename T>
ALWAYS_INLINE void out(u64 start_offset, T value)
{
#if ARCH(X86_64)
if (m_space_type == SpaceType::IO) {
VERIFY(m_io_range);
as_io_address().offset(start_offset).out<T>(value);
return;
}
#endif
VERIFY(m_space_type == SpaceType::Memory);
VERIFY(m_memory_mapped_range);
// Note: For memory-mapped IO we simply never allow unaligned access as it
// can cause problems with strict bare metal hardware. For example, some XHCI USB controllers
// might completely lock up because of an unaligned memory access to their registers.
VERIFY((start_offset % sizeof(T)) == 0);
*(T volatile*)(as_memory_address_pointer() + start_offset) = value;
}
SpaceType m_space_type { SpaceType::Memory };
OwnPtr<Memory::TypedMapping<u8 volatile>> m_memory_mapped_range;
#if ARCH(X86_64)
OwnPtr<IOAddressData> m_io_range;
#endif
};
}
template<>
struct AK::Formatter<Kernel::IOWindow> : AK::Formatter<FormatString> {
ErrorOr<void> format(FormatBuilder& builder, Kernel::IOWindow const& value)
{
#if ARCH(X86_64)
if (value.space_type() == Kernel::IOWindow::SpaceType::IO)
return Formatter<FormatString>::format(builder, "{}"sv, value.as_io_address());
#endif
VERIFY(value.space_type() == Kernel::IOWindow::SpaceType::Memory);
return Formatter<FormatString>::format(builder, "Memory {}"sv, value.as_physical_memory_address());
}
};
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