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e1f414b6 | 1 | /** @file\r |
2 | I/O Library. This file has compiler specifics for GCC as there is no\r | |
3 | ANSI C standard for doing IO.\r | |
4 | \r | |
5 | GCC - uses EFIAPI assembler. __asm__ calls GAS. __volatile__ makes sure the\r | |
6 | compiler puts the assembler in this exact location. The complex GNUC\r | |
7 | operations are not optimzed. It would be possible to also write these\r | |
8 | with EFIAPI assembler.\r | |
9 | \r | |
10 | We don't advocate putting compiler specifics in libraries or drivers but there\r | |
11 | is no other way to make this work.\r | |
12 | \r | |
373ade0e | 13 | Copyright (c) 2006 - 2008, Intel Corporation<BR>\r |
e1f414b6 | 14 | All rights reserved. This program and the accompanying materials\r |
15 | are licensed and made available under the terms and conditions of the BSD License\r | |
16 | which accompanies this distribution. The full text of the license may be found at\r | |
17 | http://opensource.org/licenses/bsd-license.php\r | |
18 | \r | |
19 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
20 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
21 | \r | |
e1f414b6 | 22 | **/\r |
23 | \r | |
1efcc4ae | 24 | \r |
f734a10a | 25 | #include "BaseIoLibIntrinsicInternal.h"\r |
e1f414b6 | 26 | \r |
2281e7a9 | 27 | /**\r |
28 | Reads an 8-bit I/O port.\r | |
29 | \r | |
30 | Reads the 8-bit I/O port specified by Port. The 8-bit read value is returned.\r | |
31 | This function must guarantee that all I/O read and write operations are\r | |
32 | serialized.\r | |
33 | \r | |
34 | If 8-bit I/O port operations are not supported, then ASSERT().\r | |
35 | \r | |
36 | @param Port The I/O port to read.\r | |
37 | \r | |
38 | @return The value read.\r | |
39 | \r | |
40 | **/\r | |
9de780dc | 41 | __inline__\r |
e1f414b6 | 42 | UINT8\r |
43 | EFIAPI\r | |
44 | IoRead8 (\r | |
45 | IN UINTN Port\r | |
46 | )\r | |
47 | {\r | |
48 | UINT8 Data;\r | |
49 | \r | |
50 | __asm__ __volatile__ ("inb %w1,%b0" : "=a" (Data) : "d" ((UINT16)Port));\r | |
51 | return Data;\r | |
52 | }\r | |
53 | \r | |
2281e7a9 | 54 | /**\r |
55 | Writes an 8-bit I/O port.\r | |
56 | \r | |
57 | Writes the 8-bit I/O port specified by Port with the value specified by Value\r | |
58 | and returns Value. This function must guarantee that all I/O read and write\r | |
59 | operations are 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 write.\r | |
64 | @param Value The value to write to the I/O port.\r | |
65 | \r | |
66 | @return The value written the I/O port.\r | |
67 | \r | |
68 | **/\r | |
9de780dc | 69 | __inline__\r |
e1f414b6 | 70 | UINT8\r |
71 | EFIAPI\r | |
72 | IoWrite8 (\r | |
73 | IN UINTN Port,\r | |
74 | IN UINT8 Value\r | |
75 | )\r | |
76 | {\r | |
77 | __asm__ __volatile__ ("outb %b0,%w1" : : "a" (Value), "d" ((UINT16)Port));\r | |
78 | return Value;;\r | |
79 | }\r | |
80 | \r | |
2281e7a9 | 81 | /**\r |
82 | Reads a 16-bit I/O port.\r | |
83 | \r | |
84 | Reads the 16-bit I/O port specified by Port. The 16-bit read value is returned.\r | |
85 | This function must guarantee that all I/O read and write operations are\r | |
86 | serialized.\r | |
87 | \r | |
88 | If 16-bit I/O port operations are not supported, then ASSERT().\r | |
89 | If Port is not aligned on a 16-bit boundary, then ASSERT().\r | |
90 | \r | |
91 | @param Port The I/O port to read.\r | |
92 | \r | |
93 | @return The value read.\r | |
94 | \r | |
95 | **/\r | |
9de780dc | 96 | __inline__\r |
e1f414b6 | 97 | UINT16\r |
98 | EFIAPI\r | |
99 | IoRead16 (\r | |
100 | IN UINTN Port\r | |
101 | )\r | |
102 | {\r | |
103 | UINT16 Data;\r | |
104 | \r | |
105 | ASSERT ((Port & 1) == 0);\r | |
106 | __asm__ __volatile__ ("inw %w1,%w0" : "=a" (Data) : "d" ((UINT16)Port));\r | |
107 | return Data;\r | |
108 | }\r | |
109 | \r | |
2281e7a9 | 110 | /**\r |
111 | Writes a 16-bit I/O port.\r | |
112 | \r | |
113 | Writes the 16-bit I/O port specified by Port with the value specified by Value\r | |
114 | and returns Value. This function must guarantee that all I/O read and write\r | |
115 | operations are 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 write.\r | |
121 | @param Value The value to write to the I/O port.\r | |
122 | \r | |
123 | @return The value written the I/O port.\r | |
124 | \r | |
125 | **/\r | |
9de780dc | 126 | __inline__\r |
e1f414b6 | 127 | UINT16\r |
128 | EFIAPI\r | |
129 | IoWrite16 (\r | |
130 | IN UINTN Port,\r | |
131 | IN UINT16 Value\r | |
132 | )\r | |
133 | {\r | |
134 | ASSERT ((Port & 1) == 0);\r | |
135 | __asm__ __volatile__ ("outw %w0,%w1" : : "a" (Value), "d" ((UINT16)Port));\r | |
136 | return Value;;\r | |
137 | }\r | |
138 | \r | |
2281e7a9 | 139 | /**\r |
140 | Reads a 32-bit I/O port.\r | |
141 | \r | |
142 | Reads the 32-bit I/O port specified by Port. The 32-bit read value is returned.\r | |
143 | This function must guarantee that all I/O read and write operations are\r | |
144 | serialized.\r | |
145 | \r | |
146 | If 32-bit I/O port operations are not supported, then ASSERT().\r | |
147 | If Port is not aligned on a 32-bit boundary, then ASSERT().\r | |
148 | \r | |
149 | @param Port The I/O port to read.\r | |
150 | \r | |
151 | @return The value read.\r | |
152 | \r | |
153 | **/\r | |
9de780dc | 154 | __inline__\r |
e1f414b6 | 155 | UINT32\r |
156 | EFIAPI\r | |
157 | IoRead32 (\r | |
158 | IN UINTN Port\r | |
159 | )\r | |
160 | {\r | |
161 | UINT32 Data;\r | |
162 | \r | |
163 | ASSERT ((Port & 3) == 0);\r | |
164 | __asm__ __volatile__ ("inl %w1,%0" : "=a" (Data) : "d" ((UINT16)Port));\r | |
165 | return Data;\r | |
166 | }\r | |
167 | \r | |
2281e7a9 | 168 | /**\r |
169 | Writes a 32-bit I/O port.\r | |
170 | \r | |
171 | Writes the 32-bit I/O port specified by Port with the value specified by Value\r | |
172 | and returns Value. This function must guarantee that all I/O read and write\r | |
173 | operations are serialized.\r | |
174 | \r | |
175 | If 32-bit I/O port operations are not supported, then ASSERT().\r | |
176 | If Port is not aligned on a 32-bit boundary, then ASSERT().\r | |
177 | \r | |
178 | @param Port The I/O port to write.\r | |
179 | @param Value The value to write to the I/O port.\r | |
180 | \r | |
181 | @return The value written the I/O port.\r | |
182 | \r | |
183 | **/\r | |
9de780dc | 184 | __inline__\r |
e1f414b6 | 185 | UINT32\r |
186 | EFIAPI\r | |
187 | IoWrite32 (\r | |
188 | IN UINTN Port,\r | |
2281e7a9 | 189 | IN UINT32 Value\r |
e1f414b6 | 190 | )\r |
191 | {\r | |
192 | ASSERT ((Port & 3) == 0);\r | |
193 | __asm__ __volatile__ ("outl %0,%w1" : : "a" (Value), "d" ((UINT16)Port));\r | |
194 | return Value;\r | |
195 | }\r | |
196 | \r |