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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 | |
e5f461a8 | 13 | Copyright (c) 2006 - 2007, Intel Corporation<BR>\r |
878ddf1f | 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 | |
2ce31132 | 26 | /**\r |
27 | Reads an 8-bit MMIO register.\r | |
28 | \r | |
29 | Reads the 8-bit MMIO register specified by Address. The 8-bit read value is\r | |
30 | returned. This function must guarantee that all MMIO read and write\r | |
31 | operations are serialized.\r | |
32 | \r | |
33 | If 8-bit MMIO register operations are not supported, then ASSERT().\r | |
34 | \r | |
35 | @param Address The MMIO register to read.\r | |
36 | \r | |
37 | @return The value read.\r | |
38 | \r | |
39 | **/\r | |
40 | UINT8\r | |
41 | EFIAPI\r | |
42 | MmioRead8 (\r | |
43 | IN UINTN Address\r | |
44 | )\r | |
45 | {\r | |
46 | return *(volatile UINT8*)Address;\r | |
47 | }\r | |
48 | \r | |
49 | /**\r | |
50 | Writes an 8-bit MMIO register.\r | |
51 | \r | |
52 | Writes the 8-bit MMIO register specified by Address with the value specified\r | |
53 | by Value and returns Value. This function must guarantee that all MMIO read\r | |
54 | and write operations are serialized.\r | |
55 | \r | |
56 | If 8-bit MMIO register operations are not supported, then ASSERT().\r | |
57 | \r | |
58 | @param Address The MMIO register to write.\r | |
59 | @param Value The value to write to the MMIO register.\r | |
60 | \r | |
61 | **/\r | |
62 | UINT8\r | |
63 | EFIAPI\r | |
64 | MmioWrite8 (\r | |
65 | IN UINTN Address,\r | |
66 | IN UINT8 Value\r | |
67 | )\r | |
68 | {\r | |
69 | return *(volatile UINT8*)Address = Value;\r | |
70 | }\r | |
71 | \r | |
72 | /**\r | |
73 | Reads a 16-bit MMIO register.\r | |
74 | \r | |
75 | Reads the 16-bit MMIO register specified by Address. The 16-bit read value is\r | |
76 | returned. This function must guarantee that all MMIO read and write\r | |
77 | operations are serialized.\r | |
78 | \r | |
79 | If 16-bit MMIO register operations are not supported, then ASSERT().\r | |
80 | \r | |
81 | @param Address The MMIO register to read.\r | |
82 | \r | |
83 | @return The value read.\r | |
84 | \r | |
85 | **/\r | |
86 | UINT16\r | |
87 | EFIAPI\r | |
88 | MmioRead16 (\r | |
89 | IN UINTN Address\r | |
90 | )\r | |
91 | {\r | |
92 | ASSERT ((Address & 1) == 0);\r | |
93 | return *(volatile UINT16*)Address;\r | |
94 | }\r | |
95 | \r | |
96 | /**\r | |
97 | Writes a 16-bit MMIO register.\r | |
98 | \r | |
99 | Writes the 16-bit MMIO register specified by Address with the value specified\r | |
100 | by Value and returns Value. This function must guarantee that all MMIO read\r | |
101 | and write operations are serialized.\r | |
102 | \r | |
103 | If 16-bit MMIO register operations are not supported, then ASSERT().\r | |
104 | \r | |
105 | @param Address The MMIO register to write.\r | |
106 | @param Value The value to write to the MMIO register.\r | |
107 | \r | |
108 | **/\r | |
109 | UINT16\r | |
110 | EFIAPI\r | |
111 | MmioWrite16 (\r | |
112 | IN UINTN Address,\r | |
113 | IN UINT16 Value\r | |
114 | )\r | |
115 | {\r | |
116 | ASSERT ((Address & 1) == 0);\r | |
117 | return *(volatile UINT16*)Address = Value;\r | |
118 | }\r | |
119 | \r | |
120 | /**\r | |
121 | Reads a 32-bit MMIO register.\r | |
122 | \r | |
123 | Reads the 32-bit MMIO register specified by Address. The 32-bit read value is\r | |
124 | returned. This function must guarantee that all MMIO read and write\r | |
125 | operations are serialized.\r | |
126 | \r | |
127 | If 32-bit MMIO register operations are not supported, then ASSERT().\r | |
128 | \r | |
129 | @param Address The MMIO register to read.\r | |
130 | \r | |
131 | @return The value read.\r | |
132 | \r | |
133 | **/\r | |
134 | UINT32\r | |
135 | EFIAPI\r | |
136 | MmioRead32 (\r | |
137 | IN UINTN Address\r | |
138 | )\r | |
139 | {\r | |
140 | ASSERT ((Address & 3) == 0);\r | |
141 | return *(volatile UINT32*)Address;\r | |
142 | }\r | |
143 | \r | |
144 | /**\r | |
145 | Writes a 32-bit MMIO register.\r | |
146 | \r | |
147 | Writes the 32-bit MMIO register specified by Address with the value specified\r | |
148 | by Value and returns Value. This function must guarantee that all MMIO read\r | |
149 | and write operations are serialized.\r | |
150 | \r | |
151 | If 32-bit MMIO register operations are not supported, then ASSERT().\r | |
152 | \r | |
153 | @param Address The MMIO register to write.\r | |
154 | @param Value The value to write to the MMIO register.\r | |
155 | \r | |
156 | **/\r | |
157 | UINT32\r | |
158 | EFIAPI\r | |
159 | MmioWrite32 (\r | |
160 | IN UINTN Address,\r | |
161 | IN UINT32 Value\r | |
162 | )\r | |
163 | {\r | |
164 | ASSERT ((Address & 3) == 0);\r | |
165 | return *(volatile UINT32*)Address = Value;\r | |
166 | }\r | |
167 | \r | |
168 | /**\r | |
169 | Reads a 64-bit MMIO register.\r | |
170 | \r | |
171 | Reads the 64-bit MMIO register specified by Address. The 64-bit read value is\r | |
172 | returned. This function must guarantee that all MMIO read and write\r | |
173 | operations are serialized.\r | |
174 | \r | |
175 | If 64-bit MMIO register operations are not supported, then ASSERT().\r | |
176 | \r | |
177 | @param Address The MMIO register to read.\r | |
178 | \r | |
179 | @return The value read.\r | |
180 | \r | |
181 | **/\r | |
182 | UINT64\r | |
183 | EFIAPI\r | |
184 | MmioRead64 (\r | |
185 | IN UINTN Address\r | |
186 | )\r | |
187 | {\r | |
188 | ASSERT ((Address & 7) == 0);\r | |
189 | return *(volatile UINT64*)Address;\r | |
190 | }\r | |
191 | \r | |
192 | /**\r | |
193 | Writes a 64-bit MMIO register.\r | |
194 | \r | |
195 | Writes the 64-bit MMIO register specified by Address with the value specified\r | |
196 | by Value and returns Value. This function must guarantee that all MMIO read\r | |
197 | and write operations are serialized.\r | |
198 | \r | |
199 | If 64-bit MMIO register operations are not supported, then ASSERT().\r | |
200 | \r | |
201 | @param Address The MMIO register to write.\r | |
202 | @param Value The value to write to the MMIO register.\r | |
203 | \r | |
204 | **/\r | |
205 | UINT64\r | |
206 | EFIAPI\r | |
207 | MmioWrite64 (\r | |
208 | IN UINTN Address,\r | |
209 | IN UINT64 Value\r | |
210 | )\r | |
211 | {\r | |
212 | ASSERT ((Address & 7) == 0);\r | |
213 | return *(volatile UINT64*)Address = Value;\r | |
214 | }\r | |
215 | \r | |
216 | \r | |
217 | \r | |
878ddf1f | 218 | /**\r |
219 | Reads an 8-bit I/O port.\r | |
220 | \r | |
221 | Reads the 8-bit I/O port specified by Port. The 8-bit read value is returned.\r | |
222 | This function must guarantee that all I/O read and write operations are\r | |
223 | serialized.\r | |
224 | \r | |
225 | If 8-bit I/O port operations are not supported, then ASSERT().\r | |
226 | \r | |
227 | @param Port The I/O port to read.\r | |
228 | \r | |
229 | @return The value read.\r | |
230 | \r | |
231 | **/\r | |
232 | __inline__\r | |
233 | UINT8\r | |
234 | EFIAPI\r | |
235 | IoRead8 (\r | |
236 | IN UINTN Port\r | |
237 | )\r | |
238 | {\r | |
239 | UINT8 Data;\r | |
240 | \r | |
241 | __asm__ __volatile__ ("inb %w1,%b0" : "=a" (Data) : "d" ((UINT16)Port));\r | |
242 | return Data;\r | |
243 | }\r | |
244 | \r | |
245 | /**\r | |
246 | Writes an 8-bit I/O port.\r | |
247 | \r | |
248 | Writes the 8-bit I/O port specified by Port with the value specified by Value\r | |
249 | and returns Value. This function must guarantee that all I/O read and write\r | |
250 | operations are serialized.\r | |
251 | \r | |
252 | If 8-bit I/O port operations are not supported, then ASSERT().\r | |
253 | \r | |
254 | @param Port The I/O port to write.\r | |
255 | @param Value The value to write to the I/O port.\r | |
256 | \r | |
257 | @return The value written the I/O port.\r | |
258 | \r | |
259 | **/\r | |
260 | __inline__\r | |
261 | UINT8\r | |
262 | EFIAPI\r | |
263 | IoWrite8 (\r | |
264 | IN UINTN Port,\r | |
265 | IN UINT8 Value\r | |
266 | )\r | |
267 | {\r | |
268 | __asm__ __volatile__ ("outb %b0,%w1" : : "a" (Value), "d" ((UINT16)Port));\r | |
269 | return Value;;\r | |
270 | }\r | |
271 | \r | |
272 | /**\r | |
273 | Reads a 16-bit I/O port.\r | |
274 | \r | |
275 | Reads the 16-bit I/O port specified by Port. The 16-bit read value is returned.\r | |
276 | This function must guarantee that all I/O read and write operations are\r | |
277 | serialized.\r | |
278 | \r | |
279 | If 16-bit I/O port operations are not supported, then ASSERT().\r | |
280 | \r | |
281 | @param Port The I/O port to read.\r | |
282 | \r | |
283 | @return The value read.\r | |
284 | \r | |
285 | **/\r | |
286 | __inline__\r | |
287 | UINT16\r | |
288 | EFIAPI\r | |
289 | IoRead16 (\r | |
290 | IN UINTN Port\r | |
291 | )\r | |
292 | {\r | |
293 | UINT16 Data;\r | |
294 | \r | |
295 | ASSERT ((Port & 1) == 0);\r | |
296 | __asm__ __volatile__ ("inw %w1,%w0" : "=a" (Data) : "d" ((UINT16)Port));\r | |
297 | return Data;\r | |
298 | }\r | |
299 | \r | |
300 | /**\r | |
301 | Writes a 16-bit I/O port.\r | |
302 | \r | |
303 | Writes the 16-bit I/O port specified by Port with the value specified by Value\r | |
304 | and returns Value. This function must guarantee that all I/O read and write\r | |
305 | operations are serialized.\r | |
306 | \r | |
307 | If 16-bit I/O port operations are not supported, then ASSERT().\r | |
308 | \r | |
309 | @param Port The I/O port to write.\r | |
310 | @param Value The value to write to the I/O port.\r | |
311 | \r | |
312 | @return The value written the I/O port.\r | |
313 | \r | |
314 | **/\r | |
315 | __inline__\r | |
316 | UINT16\r | |
317 | EFIAPI\r | |
318 | IoWrite16 (\r | |
319 | IN UINTN Port,\r | |
320 | IN UINT16 Value\r | |
321 | )\r | |
322 | {\r | |
323 | ASSERT ((Port & 1) == 0);\r | |
324 | __asm__ __volatile__ ("outw %w0,%w1" : : "a" (Value), "d" ((UINT16)Port));\r | |
325 | return Value;;\r | |
326 | }\r | |
327 | \r | |
328 | /**\r | |
329 | Reads a 32-bit I/O port.\r | |
330 | \r | |
331 | Reads the 32-bit I/O port specified by Port. The 32-bit read value is returned.\r | |
332 | This function must guarantee that all I/O read and write operations are\r | |
333 | serialized.\r | |
334 | \r | |
335 | If 32-bit I/O port operations are not supported, then ASSERT().\r | |
336 | \r | |
337 | @param Port The I/O port to read.\r | |
338 | \r | |
339 | @return The value read.\r | |
340 | \r | |
341 | **/\r | |
342 | __inline__\r | |
343 | UINT32\r | |
344 | EFIAPI\r | |
345 | IoRead32 (\r | |
346 | IN UINTN Port\r | |
347 | )\r | |
348 | {\r | |
349 | UINT32 Data;\r | |
350 | \r | |
351 | ASSERT ((Port & 3) == 0);\r | |
352 | __asm__ __volatile__ ("inl %w1,%0" : "=a" (Data) : "d" ((UINT16)Port));\r | |
353 | return Data;\r | |
354 | }\r | |
355 | \r | |
356 | /**\r | |
357 | Writes a 32-bit I/O port.\r | |
358 | \r | |
359 | Writes the 32-bit I/O port specified by Port with the value specified by Value\r | |
360 | and returns Value. This function must guarantee that all I/O read and write\r | |
361 | operations are serialized.\r | |
362 | \r | |
363 | If 32-bit I/O port operations are not supported, then ASSERT().\r | |
364 | \r | |
365 | @param Port The I/O port to write.\r | |
366 | @param Value The value to write to the I/O port.\r | |
367 | \r | |
368 | @return The value written the I/O port.\r | |
369 | \r | |
370 | **/\r | |
371 | __inline__\r | |
372 | UINT32\r | |
373 | EFIAPI\r | |
374 | IoWrite32 (\r | |
375 | IN UINTN Port,\r | |
376 | IN UINT32 Value\r | |
377 | )\r | |
378 | {\r | |
379 | ASSERT ((Port & 3) == 0);\r | |
380 | __asm__ __volatile__ ("outl %0,%w1" : : "a" (Value), "d" ((UINT16)Port));\r | |
381 | return Value;\r | |
382 | }\r | |
383 | \r |