1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
|
/*++
Copyright (c) 2006, Intel Corporation
All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
Module Name:
CpuIo.c
Abstract:
This is the code that publishes the CPU I/O Protocol.
The intent herein is to have a single I/O service that can load
as early as possible, extend into runtime, and be layered upon by
the implementations of architectural protocols and the PCI Root
Bridge I/O Protocol.
--*/
//
// Include common header file for this module.
//
#include "CommonHeader.h"
#include <CpuDriver.h>
#define IA32_MAX_IO_ADDRESS 0xFFFF
#define IA32_MAX_MEM_ADDRESS 0xFFFFFFFF
EFI_CPU_IO_PROTOCOL mCpuIoProtocol;
EFI_STATUS
CpuIoCheckAddressRange (
IN EFI_CPU_IO_PROTOCOL_WIDTH Width,
IN UINT64 Address,
IN UINTN Count,
IN VOID *Buffer,
IN UINT64 Limit
);
EFI_STATUS
EFIAPI
CpuMemoryServiceRead (
IN EFI_CPU_IO_PROTOCOL *This,
IN EFI_CPU_IO_PROTOCOL_WIDTH Width,
IN UINT64 Address,
IN UINTN Count,
IN OUT VOID *Buffer
)
/*++
Routine Description:
Perform the Memory Access Read service for the CPU I/O Protocol
Arguments:
Pointer to an instance of the CPU I/O Protocol
Width of the Memory Access
Address of the Memory access
Count of the number of accesses to perform
Pointer to the buffer to read or write from memory
Returns:
Status
EFI_SUCCESS - The data was read from or written to the EFI
System.
EFI_INVALID_PARAMETER - Width is invalid for this EFI System.
EFI_INVALID_PARAMETER - Buffer is NULL.
EFI_UNSUPPORTED - The Buffer is not aligned for the given Width.
EFI_UNSUPPORTED - The address range specified by Address, Width,
and Count is not valid for this EFI System.
--*/
// TODO: This - add argument and description to function comment
{
EFI_STATUS Status;
if (!Buffer) {
return EFI_INVALID_PARAMETER;
}
Status = CpuIoCheckAddressRange (Width, Address, Count, Buffer, IA32_MAX_MEM_ADDRESS);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Do nothing for Nt32 version
//
return EFI_SUCCESS;
}
EFI_STATUS
EFIAPI
CpuMemoryServiceWrite (
IN EFI_CPU_IO_PROTOCOL *This,
IN EFI_CPU_IO_PROTOCOL_WIDTH Width,
IN UINT64 Address,
IN UINTN Count,
IN OUT VOID *Buffer
)
/*++
Routine Description:
Perform the Memory Access Read service for the CPU I/O Protocol
Arguments:
Pointer to an instance of the CPU I/O Protocol
Width of the Memory Access
Address of the Memory access
Count of the number of accesses to perform
Pointer to the buffer to read or write from memory
Returns:
Status
EFI_SUCCESS - The data was read from or written to the EFI System.
EFI_INVALID_PARAMETER - Width is invalid for this EFI System.
EFI_INVALID_PARAMETER - Buffer is NULL.
EFI_UNSUPPORTED - The Buffer is not aligned for the given Width.
EFI_UNSUPPORTED - The address range specified by Address, Width, and
Count is not valid for this EFI System.
--*/
// TODO: This - add argument and description to function comment
{
EFI_STATUS Status;
if (!Buffer) {
return EFI_INVALID_PARAMETER;
}
Status = CpuIoCheckAddressRange (Width, Address, Count, Buffer, IA32_MAX_MEM_ADDRESS);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Do nothing for Nt32 version
//
return EFI_SUCCESS;
}
EFI_STATUS
EFIAPI
CpuIoServiceRead (
IN EFI_CPU_IO_PROTOCOL *This,
IN EFI_CPU_IO_PROTOCOL_WIDTH Width,
IN UINT64 UserAddress,
IN UINTN Count,
IN OUT VOID *UserBuffer
)
/*++
Routine Description:
This is the service that implements the I/O read
Arguments:
Pointer to an instance of the CPU I/O Protocol
Width of the Memory Access
Address of the I/O access
Count of the number of accesses to perform
Pointer to the buffer to read or write from I/O space
Returns:
Status
EFI_SUCCESS - The data was read from or written to the EFI System.
EFI_INVALID_PARAMETER - Width is invalid for this EFI System.
EFI_INVALID_PARAMETER - Buffer is NULL.
EFI_UNSUPPORTED - The Buffer is not aligned for the given Width.
EFI_UNSUPPORTED - The address range specified by Address, Width, and
Count is not valid for this EFI System.
--*/
// TODO: This - add argument and description to function comment
// TODO: UserAddress - add argument and description to function comment
// TODO: UserBuffer - add argument and description to function comment
{
UINTN Address;
EFI_STATUS Status;
if (!UserBuffer) {
return EFI_INVALID_PARAMETER;
}
Address = (UINTN) UserAddress;
if (Width >= EfiCpuIoWidthMaximum) {
return EFI_INVALID_PARAMETER;
}
Status = CpuIoCheckAddressRange (Width, Address, Count, UserBuffer, IA32_MAX_IO_ADDRESS);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Do nothing for Nt32 version
//
return EFI_SUCCESS;
}
EFI_STATUS
EFIAPI
CpuIoServiceWrite (
IN EFI_CPU_IO_PROTOCOL *This,
IN EFI_CPU_IO_PROTOCOL_WIDTH Width,
IN UINT64 UserAddress,
IN UINTN Count,
IN OUT VOID *UserBuffer
)
/*++
Routine Description:
This is the service that implements the I/O Write
Arguments:
Pointer to an instance of the CPU I/O Protocol
Width of the Memory Access
Address of the I/O access
Count of the number of accesses to perform
Pointer to the buffer to read or write from I/O space
Returns:
Status
Status
EFI_SUCCESS - The data was read from or written to the EFI System.
EFI_INVALID_PARAMETER - Width is invalid for this EFI System.
EFI_INVALID_PARAMETER - Buffer is NULL.
EFI_UNSUPPORTED - The Buffer is not aligned for the given Width.
EFI_UNSUPPORTED - The address range specified by Address, Width, and
Count is not valid for this EFI System.
--*/
// TODO: This - add argument and description to function comment
// TODO: UserAddress - add argument and description to function comment
// TODO: UserBuffer - add argument and description to function comment
{
UINTN Address;
EFI_STATUS Status;
if (!UserBuffer) {
return EFI_INVALID_PARAMETER;
}
Address = (UINTN) UserAddress;
if (Width >= EfiCpuIoWidthMaximum) {
return EFI_INVALID_PARAMETER;
}
Status = CpuIoCheckAddressRange (Width, Address, Count, UserBuffer, IA32_MAX_IO_ADDRESS);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Do nothing for Nt32 version
//
return EFI_SUCCESS;
}
EFI_STATUS
CpuIoCheckAddressRange (
IN EFI_CPU_IO_PROTOCOL_WIDTH Width,
IN UINT64 Address,
IN UINTN Count,
IN VOID *Buffer,
IN UINT64 Limit
)
/*++
Routine Description:
TODO: Add function description
Arguments:
Width - TODO: add argument description
Address - TODO: add argument description
Count - TODO: add argument description
Buffer - TODO: add argument description
Limit - TODO: add argument description
Returns:
EFI_UNSUPPORTED - TODO: Add description for return value
EFI_UNSUPPORTED - TODO: Add description for return value
EFI_UNSUPPORTED - TODO: Add description for return value
EFI_SUCCESS - TODO: Add description for return value
--*/
{
UINTN AlignMask;
if (Address > Limit) {
return EFI_UNSUPPORTED;
}
//
// For FiFo type, the target address won't increase during the access, so treat count as 1
//
if (Width >= EfiCpuIoWidthFifoUint8 && Width <= EfiCpuIoWidthFifoUint64) {
Count = 1;
}
Width = Width & 0x03;
if (Address - 1 + (1 << Width) * Count > Limit) {
return EFI_UNSUPPORTED;
}
AlignMask = (1 << Width) - 1;
if ((UINTN) Buffer & AlignMask) {
return EFI_UNSUPPORTED;
}
return EFI_SUCCESS;
}
|
