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/** @file
Device IO protocol as defined in the EFI 1.10 specification.
Device IO is used to abstract hardware access to devices. It includes
memory mapped IO, IO, PCI Config space, and DMA.
Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#ifndef __DEVICE_IO_H__
#define __DEVICE_IO_H__
#define EFI_DEVICE_IO_PROTOCOL_GUID \
{ \
0xaf6ac311, 0x84c3, 0x11d2, {0x8e, 0x3c, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b } \
}
typedef struct _EFI_DEVICE_IO_PROTOCOL EFI_DEVICE_IO_PROTOCOL;
///
/// Protocol GUID name defined in EFI1.1.
///
#define DEVICE_IO_PROTOCOL EFI_DEVICE_IO_PROTOCOL_GUID
///
/// Protocol defined in EFI1.1.
///
typedef EFI_DEVICE_IO_PROTOCOL EFI_DEVICE_IO_INTERFACE;
///
/// Device IO Access Width
///
typedef enum {
IO_UINT8 = 0,
IO_UINT16 = 1,
IO_UINT32 = 2,
IO_UINT64 = 3,
//
// Below enumerations are added in "Extensible Firmware Interface Specification,
// Version 1.10, Specification Update, Version 001".
//
MMIO_COPY_UINT8 = 4,
MMIO_COPY_UINT16 = 5,
MMIO_COPY_UINT32 = 6,
MMIO_COPY_UINT64 = 7
} EFI_IO_WIDTH;
/**
Enables a driver to access device registers in the appropriate memory or I/O space.
@param This A pointer to the EFI_DEVICE_IO_INTERFACE instance.
@param Width Signifies the width of the I/O operations.
@param Address The base address of the I/O operations.
@param Count The number of I/O operations to perform.
@param Buffer For read operations, the destination buffer to store the results. For write
operations, the source buffer to write data from. If
Width is MMIO_COPY_UINT8, MMIO_COPY_UINT16,
MMIO_COPY_UINT32, or MMIO_COPY_UINT64, then
Buffer is interpreted as a base address of an I/O operation such as Address.
@retval EFI_SUCCESS The data was read from or written to the device.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
@retval EFI_INVALID_PARAMETER Width is invalid.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_DEVICE_IO)(
IN EFI_DEVICE_IO_PROTOCOL *This,
IN EFI_IO_WIDTH Width,
IN UINT64 Address,
IN UINTN Count,
IN OUT VOID *Buffer
);
typedef struct {
EFI_DEVICE_IO Read;
EFI_DEVICE_IO Write;
} EFI_IO_ACCESS;
/**
Provides an EFI Device Path for a PCI device with the given PCI configuration space address.
@param This A pointer to the EFI_DEVICE_IO_INTERFACE instance.
@param PciAddress The PCI configuration space address of the device whose Device Path
is going to be returned.
@param PciDevicePath A pointer to the pointer for the EFI Device Path for PciAddress.
Memory for the Device Path is allocated from the pool.
@retval EFI_SUCCESS The PciDevicePath returns a pointer to a valid EFI Device Path.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
@retval EFI_UNSUPPORTED The PciAddress does not map to a valid EFI Device Path.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PCI_DEVICE_PATH)(
IN EFI_DEVICE_IO_PROTOCOL *This,
IN UINT64 PciAddress,
IN OUT EFI_DEVICE_PATH_PROTOCOL **PciDevicePath
);
typedef enum {
///
/// A read operation from system memory by a bus master.
///
EfiBusMasterRead,
///
/// A write operation to system memory by a bus master.
///
EfiBusMasterWrite,
///
/// Provides both read and write access to system memory
/// by both the processor and a bus master. The buffer is
/// coherent from both the processor's and the bus master's
/// point of view.
///
EfiBusMasterCommonBuffer
} EFI_IO_OPERATION_TYPE;
/**
Provides the device-specific addresses needed to access system memory.
@param This A pointer to the EFI_DEVICE_IO_INTERFACE instance.
@param Operation Indicates if the bus master is going to read or write to system memory.
@param HostAddress The system memory address to map to the device.
@param NumberOfBytes On input, the number of bytes to map.
On output, the number of bytes that were mapped.
@param DeviceAddress The resulting map address for the bus master device to use to access the
hosts HostAddress.
@param Mapping A resulting value to pass to Unmap().
@retval EFI_SUCCESS The range was mapped for the returned NumberOfBytes.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
@retval EFI_UNSUPPORTED The HostAddress cannot be mapped as a common buffer.
@retval EFI_INVALID_PARAMETER The Operation or HostAddress is undefined.
@retval EFI_DEVICE_ERROR The system hardware could not map the requested address.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_IO_MAP)(
IN EFI_DEVICE_IO_PROTOCOL *This,
IN EFI_IO_OPERATION_TYPE Operation,
IN EFI_PHYSICAL_ADDRESS *HostAddress,
IN OUT UINTN *NumberOfBytes,
OUT EFI_PHYSICAL_ADDRESS *DeviceAddress,
OUT VOID **Mapping
);
/**
Completes the Map() operation and releases any corresponding resources.
@param This A pointer to the EFI_DEVICE_IO_INTERFACE instance.
@param Mapping A resulting value to pass to Unmap().
@retval EFI_SUCCESS The range was mapped for the returned NumberOfBytes.
@retval EFI_DEVICE_ERROR The system hardware could not map the requested address.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_IO_UNMAP)(
IN EFI_DEVICE_IO_PROTOCOL *This,
IN VOID *Mapping
);
/**
Allocates pages that are suitable for an EFIBusMasterCommonBuffer mapping.
@param This A pointer to the EFI_DEVICE_IO_INTERFACE instance.
@param Type The type allocation to perform.
@param MemoryType The type of memory to allocate, EfiBootServicesData or
EfiRuntimeServicesData.
@param Pages The number of pages to allocate.
@param HostAddress A pointer to store the base address of the allocated range.
@retval EFI_SUCCESS The requested memory pages were allocated.
@retval EFI_OUT_OF_RESOURCES The memory pages could not be allocated.
@retval EFI_INVALID_PARAMETER The requested memory type is invalid.
@retval EFI_UNSUPPORTED The requested HostAddress is not supported on
this platform.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_IO_ALLOCATE_BUFFER)(
IN EFI_DEVICE_IO_PROTOCOL *This,
IN EFI_ALLOCATE_TYPE Type,
IN EFI_MEMORY_TYPE MemoryType,
IN UINTN Pages,
IN OUT EFI_PHYSICAL_ADDRESS *HostAddress
);
/**
Flushes any posted write data to the device.
@param This A pointer to the EFI_DEVICE_IO_INTERFACE instance.
@retval EFI_SUCCESS The buffers were flushed.
@retval EFI_DEVICE_ERROR The buffers were not flushed due to a hardware error.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_IO_FLUSH)(
IN EFI_DEVICE_IO_PROTOCOL *This
);
/**
Frees pages that were allocated with AllocateBuffer().
@param This A pointer to the EFI_DEVICE_IO_INTERFACE instance.
@param Pages The number of pages to free.
@param HostAddress The base address of the range to free.
@retval EFI_SUCCESS The requested memory pages were allocated.
@retval EFI_NOT_FOUND The requested memory pages were not allocated with
AllocateBuffer().
@retval EFI_INVALID_PARAMETER HostAddress is not page aligned or Pages is invalid.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_IO_FREE_BUFFER)(
IN EFI_DEVICE_IO_PROTOCOL *This,
IN UINTN Pages,
IN EFI_PHYSICAL_ADDRESS HostAddress
);
///
/// This protocol provides the basic Memory, I/O, and PCI interfaces that
/// are used to abstract accesses to devices.
///
struct _EFI_DEVICE_IO_PROTOCOL {
///
/// Allows reads and writes to memory mapped I/O space.
///
EFI_IO_ACCESS Mem;
///
/// Allows reads and writes to I/O space.
///
EFI_IO_ACCESS Io;
///
/// Allows reads and writes to PCI configuration space.
///
EFI_IO_ACCESS Pci;
EFI_IO_MAP Map;
EFI_PCI_DEVICE_PATH PciDevicePath;
EFI_IO_UNMAP Unmap;
EFI_IO_ALLOCATE_BUFFER AllocateBuffer;
EFI_IO_FLUSH Flush;
EFI_IO_FREE_BUFFER FreeBuffer;
};
extern EFI_GUID gEfiDeviceIoProtocolGuid;
#endif
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