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1 | /** @file\r | |
2 | I/O Library. This file has compiler specifics for Microsft C as there is no\r | |
3 | ANSI C standard for doing IO.\r | |
4 | \r | |
5 | MSC - uses intrinsic functions and the optimize will remove the function call\r | |
6 | overhead.\r | |
7 | \r | |
8 | We don't advocate putting compiler specifics in libraries or drivers but there\r | |
9 | is no other way to make this work.\r | |
10 | \r | |
11 | Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>\r | |
12 | This program and the accompanying materials\r | |
13 | are licensed and made available under the terms and conditions of the BSD License\r | |
14 | which accompanies this distribution. The full text of the license may be found at\r | |
15 | http://opensource.org/licenses/bsd-license.php.\r | |
16 | \r | |
17 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
18 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
19 | \r | |
20 | **/\r | |
21 | \r | |
22 | \r | |
23 | \r | |
24 | #include "BaseIoLibIntrinsicInternal.h"\r | |
25 | \r | |
26 | //\r | |
27 | // Microsoft Visual Studio 7.1 Function Prototypes for I/O Intrinsics.\r | |
28 | //\r | |
29 | \r | |
30 | int _inp (unsigned short port);\r | |
31 | unsigned short _inpw (unsigned short port);\r | |
32 | unsigned long _inpd (unsigned short port);\r | |
33 | int _outp (unsigned short port, int databyte );\r | |
34 | unsigned short _outpw (unsigned short port, unsigned short dataword );\r | |
35 | unsigned long _outpd (unsigned short port, unsigned long dataword );\r | |
36 | void _ReadWriteBarrier (void);\r | |
37 | \r | |
38 | #pragma intrinsic(_inp)\r | |
39 | #pragma intrinsic(_inpw)\r | |
40 | #pragma intrinsic(_inpd)\r | |
41 | #pragma intrinsic(_outp)\r | |
42 | #pragma intrinsic(_outpw)\r | |
43 | #pragma intrinsic(_outpd)\r | |
44 | #pragma intrinsic(_ReadWriteBarrier)\r | |
45 | \r | |
46 | //\r | |
47 | // _ReadWriteBarrier() forces memory reads and writes to complete at the point\r | |
48 | // in the call. This is only a hint to the compiler and does emit code.\r | |
49 | // In past versions of the compiler, _ReadWriteBarrier was enforced only\r | |
50 | // locally and did not affect functions up the call tree. In Visual C++\r | |
51 | // 2005, _ReadWriteBarrier is enforced all the way up the call tree.\r | |
52 | //\r | |
53 | \r | |
54 | /**\r | |
55 | Reads an 8-bit I/O port.\r | |
56 | \r | |
57 | Reads the 8-bit I/O port specified by Port. The 8-bit read value is returned.\r | |
58 | This function must guarantee that all I/O read and write operations are\r | |
59 | serialized.\r | |
60 | \r | |
61 | If 8-bit I/O port operations are not supported, then ASSERT().\r | |
62 | \r | |
63 | @param Port The I/O port to read.\r | |
64 | \r | |
65 | @return The value read.\r | |
66 | \r | |
67 | **/\r | |
68 | UINT8\r | |
69 | EFIAPI\r | |
70 | IoRead8 (\r | |
71 | IN UINTN Port\r | |
72 | )\r | |
73 | {\r | |
74 | UINT8 Value;\r | |
75 | \r | |
76 | _ReadWriteBarrier ();\r | |
77 | Value = (UINT8)_inp ((UINT16)Port);\r | |
78 | _ReadWriteBarrier ();\r | |
79 | return Value;\r | |
80 | }\r | |
81 | \r | |
82 | /**\r | |
83 | Writes an 8-bit I/O port.\r | |
84 | \r | |
85 | Writes the 8-bit I/O port specified by Port with the value specified by Value\r | |
86 | and returns Value. This function must guarantee that all I/O read and write\r | |
87 | operations are serialized.\r | |
88 | \r | |
89 | If 8-bit I/O port operations are not supported, then ASSERT().\r | |
90 | \r | |
91 | @param Port The I/O port to write.\r | |
92 | @param Value The value to write to the I/O port.\r | |
93 | \r | |
94 | @return The value written to the I/O port.\r | |
95 | \r | |
96 | **/\r | |
97 | UINT8\r | |
98 | EFIAPI\r | |
99 | IoWrite8 (\r | |
100 | IN UINTN Port,\r | |
101 | IN UINT8 Value\r | |
102 | )\r | |
103 | {\r | |
104 | _ReadWriteBarrier ();\r | |
105 | (UINT8)_outp ((UINT16)Port, Value);\r | |
106 | _ReadWriteBarrier ();\r | |
107 | return Value;\r | |
108 | }\r | |
109 | \r | |
110 | /**\r | |
111 | Reads a 16-bit I/O port.\r | |
112 | \r | |
113 | Reads the 16-bit I/O port specified by Port. The 16-bit read value is returned.\r | |
114 | This function must guarantee that all I/O read and write operations are\r | |
115 | serialized.\r | |
116 | \r | |
117 | If 16-bit I/O port operations are not supported, then ASSERT().\r | |
118 | If Port is not aligned on a 16-bit boundary, then ASSERT().\r | |
119 | \r | |
120 | @param Port The I/O port to read.\r | |
121 | \r | |
122 | @return The value read.\r | |
123 | \r | |
124 | **/\r | |
125 | UINT16\r | |
126 | EFIAPI\r | |
127 | IoRead16 (\r | |
128 | IN UINTN Port\r | |
129 | )\r | |
130 | {\r | |
131 | UINT16 Value;\r | |
132 | \r | |
133 | ASSERT ((Port & 1) == 0);\r | |
134 | _ReadWriteBarrier ();\r | |
135 | Value = _inpw ((UINT16)Port);\r | |
136 | _ReadWriteBarrier ();\r | |
137 | return Value;\r | |
138 | }\r | |
139 | \r | |
140 | /**\r | |
141 | Writes a 16-bit I/O port.\r | |
142 | \r | |
143 | Writes the 16-bit I/O port specified by Port with the value specified by Value\r | |
144 | and returns Value. This function must guarantee that all I/O read and write\r | |
145 | operations are serialized.\r | |
146 | \r | |
147 | If 16-bit I/O port operations are not supported, then ASSERT().\r | |
148 | If Port is not aligned on a 16-bit boundary, then ASSERT().\r | |
149 | \r | |
150 | @param Port The I/O port to write.\r | |
151 | @param Value The value to write to the I/O port.\r | |
152 | \r | |
153 | @return The value written to the I/O port.\r | |
154 | \r | |
155 | **/\r | |
156 | UINT16\r | |
157 | EFIAPI\r | |
158 | IoWrite16 (\r | |
159 | IN UINTN Port,\r | |
160 | IN UINT16 Value\r | |
161 | )\r | |
162 | {\r | |
163 | ASSERT ((Port & 1) == 0);\r | |
164 | _ReadWriteBarrier ();\r | |
165 | _outpw ((UINT16)Port, Value);\r | |
166 | _ReadWriteBarrier ();\r | |
167 | return Value;\r | |
168 | }\r | |
169 | \r | |
170 | /**\r | |
171 | Reads a 32-bit I/O port.\r | |
172 | \r | |
173 | Reads the 32-bit I/O port specified by Port. The 32-bit read value is returned.\r | |
174 | This function must guarantee that all I/O read and write operations are\r | |
175 | serialized.\r | |
176 | \r | |
177 | If 32-bit I/O port operations are not supported, then ASSERT().\r | |
178 | If Port is not aligned on a 32-bit boundary, then ASSERT().\r | |
179 | \r | |
180 | @param Port The I/O port to read.\r | |
181 | \r | |
182 | @return The value read.\r | |
183 | \r | |
184 | **/\r | |
185 | UINT32\r | |
186 | EFIAPI\r | |
187 | IoRead32 (\r | |
188 | IN UINTN Port\r | |
189 | )\r | |
190 | {\r | |
191 | UINT32 Value;\r | |
192 | \r | |
193 | ASSERT ((Port & 3) == 0);\r | |
194 | _ReadWriteBarrier ();\r | |
195 | Value = _inpd ((UINT16)Port);\r | |
196 | _ReadWriteBarrier ();\r | |
197 | return Value;\r | |
198 | }\r | |
199 | \r | |
200 | /**\r | |
201 | Writes a 32-bit I/O port.\r | |
202 | \r | |
203 | Writes the 32-bit I/O port specified by Port with the value specified by Value\r | |
204 | and returns Value. This function must guarantee that all I/O read and write\r | |
205 | operations are serialized.\r | |
206 | \r | |
207 | If 32-bit I/O port operations are not supported, then ASSERT().\r | |
208 | If Port is not aligned on a 32-bit boundary, then ASSERT().\r | |
209 | \r | |
210 | @param Port The I/O port to write.\r | |
211 | @param Value The value to write to the I/O port.\r | |
212 | \r | |
213 | @return The value written to the I/O port.\r | |
214 | \r | |
215 | **/\r | |
216 | UINT32\r | |
217 | EFIAPI\r | |
218 | IoWrite32 (\r | |
219 | IN UINTN Port,\r | |
220 | IN UINT32 Value\r | |
221 | )\r | |
222 | {\r | |
223 | ASSERT ((Port & 3) == 0);\r | |
224 | _ReadWriteBarrier ();\r | |
225 | _outpd ((UINT16)Port, Value);\r | |
226 | _ReadWriteBarrier ();\r | |
227 | return Value;\r | |
228 | }\r |