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878ddf1f | 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 | |
13 | Copyright (c) 2006, Intel Corporation<BR>\r | |
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 | |
22 | Module Name: IoLibGcc.c\r | |
23 | \r | |
24 | **/\r | |
25 | \r | |
26 | #ifdef __GNUC__\r | |
27 | \r | |
28 | /**\r | |
29 | Reads an 8-bit I/O port.\r | |
30 | \r | |
31 | Reads the 8-bit I/O port specified by Port. The 8-bit read value is returned.\r | |
32 | This function must guarantee that all I/O read and write operations are\r | |
33 | serialized.\r | |
34 | \r | |
35 | If 8-bit I/O port operations are not supported, then ASSERT().\r | |
36 | \r | |
37 | @param Port The I/O port to read.\r | |
38 | \r | |
39 | @return The value read.\r | |
40 | \r | |
41 | **/\r | |
42 | __inline__\r | |
43 | UINT8\r | |
44 | EFIAPI\r | |
45 | IoRead8 (\r | |
46 | IN UINTN Port\r | |
47 | )\r | |
48 | {\r | |
49 | UINT8 Data;\r | |
50 | \r | |
51 | __asm__ __volatile__ ("inb %w1,%b0" : "=a" (Data) : "d" ((UINT16)Port));\r | |
52 | return Data;\r | |
53 | }\r | |
54 | \r | |
55 | /**\r | |
56 | Writes an 8-bit I/O port.\r | |
57 | \r | |
58 | Writes the 8-bit I/O port specified by Port with the value specified by Value\r | |
59 | and returns Value. This function must guarantee that all I/O read and write\r | |
60 | operations are serialized.\r | |
61 | \r | |
62 | If 8-bit I/O port operations are not supported, then ASSERT().\r | |
63 | \r | |
64 | @param Port The I/O port to write.\r | |
65 | @param Value The value to write to the I/O port.\r | |
66 | \r | |
67 | @return The value written the I/O port.\r | |
68 | \r | |
69 | **/\r | |
70 | __inline__\r | |
71 | UINT8\r | |
72 | EFIAPI\r | |
73 | IoWrite8 (\r | |
74 | IN UINTN Port,\r | |
75 | IN UINT8 Value\r | |
76 | )\r | |
77 | {\r | |
78 | __asm__ __volatile__ ("outb %b0,%w1" : : "a" (Value), "d" ((UINT16)Port));\r | |
79 | return Value;;\r | |
80 | }\r | |
81 | \r | |
82 | /**\r | |
83 | Reads a 16-bit I/O port.\r | |
84 | \r | |
85 | Reads the 16-bit I/O port specified by Port. The 16-bit read value is returned.\r | |
86 | This function must guarantee that all I/O read and write operations are\r | |
87 | serialized.\r | |
88 | \r | |
89 | If 16-bit I/O port operations are not supported, 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 | |
96 | __inline__\r | |
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 | |
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 | \r | |
119 | @param Port The I/O port to write.\r | |
120 | @param Value The value to write to the I/O port.\r | |
121 | \r | |
122 | @return The value written the I/O port.\r | |
123 | \r | |
124 | **/\r | |
125 | __inline__\r | |
126 | UINT16\r | |
127 | EFIAPI\r | |
128 | IoWrite16 (\r | |
129 | IN UINTN Port,\r | |
130 | IN UINT16 Value\r | |
131 | )\r | |
132 | {\r | |
133 | ASSERT ((Port & 1) == 0);\r | |
134 | __asm__ __volatile__ ("outw %w0,%w1" : : "a" (Value), "d" ((UINT16)Port));\r | |
135 | return Value;;\r | |
136 | }\r | |
137 | \r | |
138 | /**\r | |
139 | Reads a 32-bit I/O port.\r | |
140 | \r | |
141 | Reads the 32-bit I/O port specified by Port. The 32-bit read value is returned.\r | |
142 | This function must guarantee that all I/O read and write operations are\r | |
143 | serialized.\r | |
144 | \r | |
145 | If 32-bit I/O port operations are not supported, then ASSERT().\r | |
146 | \r | |
147 | @param Port The I/O port to read.\r | |
148 | \r | |
149 | @return The value read.\r | |
150 | \r | |
151 | **/\r | |
152 | __inline__\r | |
153 | UINT32\r | |
154 | EFIAPI\r | |
155 | IoRead32 (\r | |
156 | IN UINTN Port\r | |
157 | )\r | |
158 | {\r | |
159 | UINT32 Data;\r | |
160 | \r | |
161 | ASSERT ((Port & 3) == 0);\r | |
162 | __asm__ __volatile__ ("inl %w1,%0" : "=a" (Data) : "d" ((UINT16)Port));\r | |
163 | return Data;\r | |
164 | }\r | |
165 | \r | |
166 | /**\r | |
167 | Writes a 32-bit I/O port.\r | |
168 | \r | |
169 | Writes the 32-bit I/O port specified by Port with the value specified by Value\r | |
170 | and returns Value. This function must guarantee that all I/O read and write\r | |
171 | operations are serialized.\r | |
172 | \r | |
173 | If 32-bit I/O port operations are not supported, then ASSERT().\r | |
174 | \r | |
175 | @param Port The I/O port to write.\r | |
176 | @param Value The value to write to the I/O port.\r | |
177 | \r | |
178 | @return The value written the I/O port.\r | |
179 | \r | |
180 | **/\r | |
181 | __inline__\r | |
182 | UINT32\r | |
183 | EFIAPI\r | |
184 | IoWrite32 (\r | |
185 | IN UINTN Port,\r | |
186 | IN UINT32 Value\r | |
187 | )\r | |
188 | {\r | |
189 | ASSERT ((Port & 3) == 0);\r | |
190 | __asm__ __volatile__ ("outl %0,%w1" : : "a" (Value), "d" ((UINT16)Port));\r | |
191 | return Value;\r | |
192 | }\r | |
193 | \r | |
194 | #endif\r |