2 This code abstracts the CPU IO Protocol which installed by some platform or chipset-specific
3 PEIM that abstracts the processor-visible I/O operations.
5 Copyright (c) 2007, Intel Corporation
6 All rights reserved. This program and the accompanying materials
7 are licensed and made available under the terms and conditions of the BSD License
8 which accompanies this distribution. The full text of the license may be found at
9 http://opensource.org/licenses/bsd-license.php
11 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
12 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
16 @par Revision Reference:
17 CPU IO Protocol is defined in Framework of EFI CPU IO Protocol Spec
27 #define EFI_CPU_IO_PROTOCOL_GUID \
29 0xB0732526, 0x38C8, 0x4b40, {0x88, 0x77, 0x61, 0xC7, 0xB0, 0x6A, 0xAC, 0x45 } \
32 typedef struct _EFI_CPU_IO_PROTOCOL EFI_CPU_IO_PROTOCOL
;
35 // *******************************************************
36 // EFI_CPU_IO_PROTOCOL_WIDTH
37 // *******************************************************
44 EfiCpuIoWidthFifoUint8
,
45 EfiCpuIoWidthFifoUint16
,
46 EfiCpuIoWidthFifoUint32
,
47 EfiCpuIoWidthFifoUint64
,
48 EfiCpuIoWidthFillUint8
,
49 EfiCpuIoWidthFillUint16
,
50 EfiCpuIoWidthFillUint32
,
51 EfiCpuIoWidthFillUint64
,
53 } EFI_CPU_IO_PROTOCOL_WIDTH
;
56 // *******************************************************
57 // EFI_CPU_IO_PROTOCOL_IO_MEM
58 // *******************************************************
61 Enables a driver to access memory-mapped registers in the EFI system memory space.
62 Or, Enables a driver to access registers in the EFI CPU I/O space.
64 @param This A pointer to the EFI_CPU_IO_PROTOCOL instance.
65 @param Width Signifies the width of the I/O or Memory operation.
66 @param Address The base address of the I/O or Memoryoperation.
67 @param Count The number of I/O or Memory operations to perform.
68 The number of bytes moved is Width size * Count, starting at Address.
69 @param Buffer For read operations, the destination buffer to store the results.
70 For write operations, the source buffer from which to write data.
72 @retval EFI_SUCCESS The data was read from or written to the EFI system.
73 @retval EFI_INVALID_PARAMETER Width is invalid for this EFI system.Or Buffer is NULL.
74 @retval EFI_UNSUPPORTED The Buffer is not aligned for the given Width.
75 Or,The address range specified by Address, Width, and Count is not valid for this EFI system.
80 (EFIAPI
*EFI_CPU_IO_PROTOCOL_IO_MEM
)(
81 IN EFI_CPU_IO_PROTOCOL
*This
,
82 IN EFI_CPU_IO_PROTOCOL_WIDTH Width
,
89 // *******************************************************
90 // EFI_CPU_IO_PROTOCOL_ACCESS
91 // *******************************************************
94 EFI_CPU_IO_PROTOCOL_IO_MEM Read
;
95 EFI_CPU_IO_PROTOCOL_IO_MEM Write
;
96 } EFI_CPU_IO_PROTOCOL_ACCESS
;
99 // *******************************************************
100 // EFI_CPU_IO_PROTOCOL
101 // *******************************************************
104 Provides the basic memory and I/O interfaces that are used to abstract
105 accesses to devices in a system.
108 Allows reads from memory-mapped I/O space.
111 Allows writes to memory-mapped I/O space.
114 Allows reads from I/O space.
117 Allows writes to I/O space.
120 struct _EFI_CPU_IO_PROTOCOL
{
121 EFI_CPU_IO_PROTOCOL_ACCESS Mem
;
122 EFI_CPU_IO_PROTOCOL_ACCESS Io
;
125 extern EFI_GUID gEfiCpuIoProtocolGuid
;