]>
Commit | Line | Data |
---|---|---|
d074a8e1 | 1 | /** @file\r |
2 | I/O Library. This file has compiler specifics for ICC as there\r | |
3 | is no ANSI C standard for doing IO.\r | |
4 | \r | |
4dd6f840 HT |
5 | Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>\r |
6 | This program and the accompanying materials are\r | |
d074a8e1 | 7 | licensed and made available under the terms and conditions of the BSD License\r |
8 | which accompanies this distribution. The full text of the license may be found at\r | |
35a17154 | 9 | http://opensource.org/licenses/bsd-license.php.\r |
d074a8e1 | 10 | \r |
11 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
12 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
13 | \r | |
14 | **/\r | |
15 | \r | |
d074a8e1 | 16 | #include "BaseIoLibIntrinsicInternal.h"\r |
17 | \r | |
d074a8e1 | 18 | /**\r |
19 | Reads an 8-bit I/O port.\r | |
20 | \r | |
21 | Reads the 8-bit I/O port specified by Port. The 8-bit read value is returned.\r | |
22 | This function must guarantee that all I/O read and write operations are\r | |
23 | serialized.\r | |
24 | \r | |
25 | If 8-bit I/O port operations are not supported, then ASSERT().\r | |
26 | \r | |
27 | @param Port The I/O port to read.\r | |
28 | \r | |
2281e7a9 | 29 | @return The value read.\r |
d074a8e1 | 30 | \r |
31 | **/\r | |
32 | UINT8\r | |
33 | EFIAPI\r | |
34 | IoRead8 (\r | |
35 | IN UINTN Port\r | |
36 | )\r | |
37 | {\r | |
38 | UINT8 Data;\r | |
39 | \r | |
40 | __asm {\r | |
41 | mov dx, word ptr [Port]\r | |
42 | in al, dx\r | |
43 | \r | |
44 | mov Data, al\r | |
45 | }\r | |
46 | return Data;\r | |
47 | }\r | |
48 | \r | |
49 | /**\r | |
50 | Writes an 8-bit I/O port.\r | |
51 | \r | |
52 | Writes the 8-bit I/O port specified by Port with the value specified by Value\r | |
53 | and returns Value. This function must guarantee that all I/O read and write\r | |
54 | operations are serialized.\r | |
55 | \r | |
56 | If 8-bit I/O port operations are not supported, then ASSERT().\r | |
57 | \r | |
58 | @param Port The I/O port to write.\r | |
59 | @param Value The value to write to the I/O port.\r | |
60 | \r | |
2281e7a9 | 61 | @return The value written the I/O port.\r |
d074a8e1 | 62 | \r |
63 | **/\r | |
64 | UINT8\r | |
65 | EFIAPI\r | |
66 | IoWrite8 (\r | |
67 | IN UINTN Port,\r | |
68 | IN UINT8 Value\r | |
69 | )\r | |
70 | {\r | |
71 | __asm {\r | |
72 | mov al, byte ptr [Value]\r | |
73 | mov dx, word ptr [Port]\r | |
74 | out dx, al\r | |
75 | }\r | |
76 | return Value; \r | |
77 | }\r | |
78 | \r | |
79 | /**\r | |
80 | Reads a 16-bit I/O port.\r | |
81 | \r | |
82 | Reads the 16-bit I/O port specified by Port. The 16-bit read value is returned.\r | |
83 | This function must guarantee that all I/O read and write operations are\r | |
84 | serialized.\r | |
85 | \r | |
86 | If 16-bit I/O port operations are not supported, then ASSERT().\r | |
2281e7a9 | 87 | If Port is not aligned on a 16-bit boundary, then ASSERT().\r |
d074a8e1 | 88 | \r |
89 | @param Port The I/O port to read.\r | |
90 | \r | |
2281e7a9 | 91 | @return The value read.\r |
d074a8e1 | 92 | \r |
93 | **/\r | |
94 | UINT16\r | |
95 | EFIAPI\r | |
96 | IoRead16 (\r | |
97 | IN UINTN Port\r | |
98 | )\r | |
99 | {\r | |
100 | UINT16 Data;\r | |
101 | \r | |
102 | ASSERT ((Port & 1) == 0);\r | |
103 | \r | |
104 | __asm {\r | |
105 | mov dx, word ptr [Port]\r | |
106 | in ax, dx\r | |
107 | mov word ptr [Data], ax\r | |
108 | }\r | |
109 | \r | |
110 | return Data;\r | |
111 | }\r | |
112 | \r | |
113 | /**\r | |
114 | Writes a 16-bit I/O port.\r | |
115 | \r | |
116 | Writes the 16-bit I/O port specified by Port with the value specified by Value\r | |
117 | and returns Value. This function must guarantee that all I/O read and write\r | |
118 | operations are serialized.\r | |
119 | \r | |
120 | If 16-bit I/O port operations are not supported, then ASSERT().\r | |
2281e7a9 | 121 | If Port is not aligned on a 16-bit boundary, then ASSERT().\r |
122 | \r | |
d074a8e1 | 123 | @param Port The I/O port to write.\r |
124 | @param Value The value to write to the I/O port.\r | |
125 | \r | |
2281e7a9 | 126 | @return The value written the I/O port.\r |
d074a8e1 | 127 | \r |
128 | **/\r | |
129 | UINT16\r | |
130 | EFIAPI\r | |
131 | IoWrite16 (\r | |
132 | IN UINTN Port,\r | |
133 | IN UINT16 Value\r | |
134 | )\r | |
135 | {\r | |
136 | ASSERT ((Port & 1) == 0);\r | |
137 | \r | |
138 | __asm {\r | |
139 | mov ax, word ptr [Value]\r | |
140 | mov dx, word ptr [Port]\r | |
141 | out dx, ax\r | |
142 | }\r | |
143 | \r | |
d074a8e1 | 144 | return Value;\r |
145 | }\r | |
146 | \r | |
147 | /**\r | |
148 | Reads a 32-bit I/O port.\r | |
149 | \r | |
150 | Reads the 32-bit I/O port specified by Port. The 32-bit read value is returned.\r | |
151 | This function must guarantee that all I/O read and write operations are\r | |
152 | serialized.\r | |
153 | \r | |
154 | If 32-bit I/O port operations are not supported, then ASSERT().\r | |
2281e7a9 | 155 | If Port is not aligned on a 32-bit boundary, then ASSERT().\r |
156 | \r | |
d074a8e1 | 157 | @param Port The I/O port to read.\r |
158 | \r | |
2281e7a9 | 159 | @return The value read.\r |
d074a8e1 | 160 | \r |
161 | **/\r | |
162 | UINT32\r | |
163 | EFIAPI\r | |
164 | IoRead32 (\r | |
165 | IN UINTN Port\r | |
166 | )\r | |
167 | {\r | |
168 | UINT32 Data;\r | |
169 | \r | |
170 | ASSERT ((Port & 3) == 0);\r | |
171 | \r | |
172 | __asm {\r | |
173 | mov dx, word ptr [Port]\r | |
174 | in eax, dx\r | |
175 | mov dword ptr [Data], eax\r | |
176 | }\r | |
177 | \r | |
178 | return Data;\r | |
179 | }\r | |
180 | \r | |
181 | /**\r | |
182 | Writes a 32-bit I/O port.\r | |
183 | \r | |
184 | Writes the 32-bit I/O port specified by Port with the value specified by Value\r | |
185 | and returns Value. This function must guarantee that all I/O read and write\r | |
186 | operations are serialized.\r | |
187 | \r | |
188 | If 32-bit I/O port operations are not supported, then ASSERT().\r | |
2281e7a9 | 189 | If Port is not aligned on a 32-bit boundary, then ASSERT().\r |
190 | \r | |
d074a8e1 | 191 | @param Port The I/O port to write.\r |
192 | @param Value The value to write to the I/O port.\r | |
193 | \r | |
2281e7a9 | 194 | @return The value written the I/O port.\r |
d074a8e1 | 195 | \r |
196 | **/\r | |
197 | UINT32\r | |
198 | EFIAPI\r | |
199 | IoWrite32 (\r | |
2281e7a9 | 200 | IN UINTN Port,\r |
201 | IN UINT32 Value\r | |
d074a8e1 | 202 | )\r |
203 | {\r | |
204 | ASSERT ((Port & 3) == 0);\r | |
205 | \r | |
206 | __asm {\r | |
207 | mov eax, dword ptr [Value]\r | |
208 | mov dx, word ptr [Port]\r | |
209 | out dx, eax\r | |
210 | }\r | |
211 | \r | |
212 | return Value;\r | |
213 | }\r | |
214 | \r |