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1 | /** @file\r |
2 | Virtio Device\r | |
3 | \r | |
4 | DISCLAIMER: the VIRTIO_DEVICE_PROTOCOL introduced here is a work in progress,\r | |
5 | and should not be used outside of the EDK II tree.\r | |
6 | \r | |
7 | Copyright (c) 2013, ARM Ltd. All rights reserved.<BR>\r | |
8 | \r | |
9 | This program and the accompanying materials are licensed and made available\r | |
10 | under the terms and conditions of the BSD License which accompanies this\r | |
11 | distribution. The full text of the license may be found at\r | |
12 | http://opensource.org/licenses/bsd-license.php\r | |
13 | \r | |
14 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT\r | |
15 | WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
16 | \r | |
17 | **/\r | |
18 | \r | |
19 | #ifndef __VIRTIO_DEVICE_H__\r | |
20 | #define __VIRTIO_DEVICE_H__\r | |
21 | \r | |
22 | // VirtIo Specification Revision: Major[31:24].Minor[23:16].Revision[15:0\r | |
23 | #define VIRTIO_SPEC_REVISION(major,minor,revision) \\r | |
24 | ((((major) & 0xFF) << 24) | (((minor) & 0xFF) << 16) | ((revision) & 0xFFFF))\r | |
25 | \r | |
26 | #define VIRTIO_DEVICE_PROTOCOL_GUID { \\r | |
27 | 0xfa920010, 0x6785, 0x4941, {0xb6, 0xec, 0x49, 0x8c, 0x57, 0x9f, 0x16, 0x0a }\\r | |
28 | }\r | |
29 | \r | |
30 | typedef struct _VIRTIO_DEVICE_PROTOCOL VIRTIO_DEVICE_PROTOCOL;\r | |
31 | \r | |
32 | /**\r | |
33 | \r | |
34 | Read a word from the device-specific I/O region of the Virtio Header.\r | |
35 | \r | |
36 | @param[in] This This instance of VIRTIO_DEVICE_PROTOCOL\r | |
37 | \r | |
38 | @param[in] FieldOffset Source offset.\r | |
39 | \r | |
40 | @param[in] FieldSize Source field size in bytes, must be in {1, 2, 4, 8}.\r | |
41 | \r | |
42 | @param[in] BufferSize Number of bytes available in the target buffer. Must\r | |
43 | equal FieldSize.\r | |
44 | \r | |
45 | @param[out] Buffer Target buffer.\r | |
46 | \r | |
47 | @retval EFI_SUCCESS The data was read successfully.\r | |
48 | @retval EFI_UNSUPPORTED The underlying IO device doesn't support the\r | |
49 | provided address offset and read size.\r | |
50 | @retval EFI_OUT_OF_RESOURCES The request could not be completed due to a\r | |
51 | lack of resources.\r | |
52 | @retval EFI_INVALID_PARAMETER One or more parameters are invalid.\r | |
53 | \r | |
54 | **/\r | |
55 | typedef\r | |
56 | EFI_STATUS\r | |
57 | (EFIAPI *VIRTIO_DEVICE_READ) (\r | |
58 | IN VIRTIO_DEVICE_PROTOCOL *This,\r | |
59 | IN UINTN FieldOffset,\r | |
60 | IN UINTN FieldSize,\r | |
61 | IN UINTN BufferSize,\r | |
62 | OUT VOID *Buffer\r | |
63 | );\r | |
64 | \r | |
65 | /**\r | |
66 | \r | |
67 | Write a word to the device-specific I/O region of the Virtio Header.\r | |
68 | \r | |
69 | @param[in] This This instance of VIRTIO_DEVICE_PROTOCOL\r | |
70 | \r | |
71 | @param[in] FieldOffset Destination offset.\r | |
72 | \r | |
73 | @param[in] FieldSize Destination field size in bytes,\r | |
74 | must be in {1, 2, 4, 8}.\r | |
75 | \r | |
76 | @param[out] Value Value to write.\r | |
77 | \r | |
78 | @retval EFI_SUCCESS The data was written successfully.\r | |
79 | @retval EFI_UNSUPPORTED The underlying IO device doesn't support the\r | |
80 | provided address offset and write size.\r | |
81 | @retval EFI_OUT_OF_RESOURCES The request could not be completed due to a\r | |
82 | lack of resources.\r | |
83 | @retval EFI_INVALID_PARAMETER One or more parameters are invalid.\r | |
84 | \r | |
85 | **/\r | |
86 | typedef\r | |
87 | EFI_STATUS\r | |
88 | (EFIAPI *VIRTIO_DEVICE_WRITE) (\r | |
89 | IN VIRTIO_DEVICE_PROTOCOL *This,\r | |
90 | IN UINTN FieldOffset,\r | |
91 | IN UINTN FieldSize,\r | |
92 | IN UINT64 Value\r | |
93 | );\r | |
94 | \r | |
95 | /**\r | |
96 | Read the device features field from the Virtio Header.\r | |
97 | \r | |
98 | @param[in] This This instance of VIRTIO_DEVICE_PROTOCOL\r | |
99 | \r | |
bc8fde6f | 100 | @param[out] DeviceFeatures The device features field.\r |
fc4d1ce5 OM |
101 | \r |
102 | @retval EFI_SUCCESS The data was read successfully.\r | |
103 | @retval EFI_UNSUPPORTED The underlying IO device doesn't support the\r | |
104 | provided address offset and read size.\r | |
105 | @retval EFI_INVALID_PARAMETER DeviceFeatures is NULL\r | |
106 | **/\r | |
107 | typedef\r | |
108 | EFI_STATUS\r | |
109 | (EFIAPI *VIRTIO_GET_DEVICE_FEATURES) (\r | |
110 | IN VIRTIO_DEVICE_PROTOCOL *This,\r | |
bc8fde6f | 111 | OUT UINT64 *DeviceFeatures\r |
fc4d1ce5 OM |
112 | );\r |
113 | \r | |
114 | /**\r | |
115 | Write the guest features field in the Virtio Header.\r | |
116 | \r | |
117 | @param[in] This This instance of VIRTIO_DEVICE_PROTOCOL\r | |
118 | \r | |
bc8fde6f | 119 | @param[in] Features The guest features field\r |
fc4d1ce5 OM |
120 | \r |
121 | **/\r | |
122 | typedef\r | |
123 | EFI_STATUS\r | |
124 | (EFIAPI *VIRTIO_SET_GUEST_FEATURES) (\r | |
125 | IN VIRTIO_DEVICE_PROTOCOL *This,\r | |
bc8fde6f | 126 | IN UINT64 Features\r |
fc4d1ce5 OM |
127 | );\r |
128 | \r | |
129 | /**\r | |
130 | Read the queue address field from the Virtio Header.\r | |
131 | \r | |
132 | QueueAddress is the address of the virtqueue divided by 4096.\r | |
133 | \r | |
134 | @param[in] This This instance of VIRTIO_DEVICE_PROTOCOL\r | |
135 | \r | |
136 | @param[out] QueueAddress The 32-bit queue address field.\r | |
137 | \r | |
138 | @retval EFI_SUCCESS The data was read successfully.\r | |
139 | @retval EFI_UNSUPPORTED The underlying IO device doesn't support the\r | |
140 | provided address offset and read size.\r | |
141 | @retval EFI_INVALID_PARAMETER QueueAddress is NULL\r | |
142 | **/\r | |
143 | typedef\r | |
144 | EFI_STATUS\r | |
145 | (EFIAPI *VIRTIO_GET_QUEUE_ADDRESS) (\r | |
146 | IN VIRTIO_DEVICE_PROTOCOL *This,\r | |
147 | OUT UINT32 *QueueAddress\r | |
148 | );\r | |
149 | \r | |
150 | /**\r | |
151 | Write the queue address field in the Virtio Header.\r | |
152 | \r | |
153 | The parameter Address must be the base address of the virtqueue divided\r | |
154 | by 4096.\r | |
155 | \r | |
156 | @param[in] This This instance of VIRTIO_DEVICE_PROTOCOL\r | |
157 | \r | |
158 | @param[in] Address The 32-bit Queue Address field\r | |
159 | \r | |
160 | @retval EFI_SUCCESS The data was written successfully.\r | |
161 | @retval EFI_UNSUPPORTED The underlying IO device doesn't support the\r | |
162 | provided address offset and write size.\r | |
163 | **/\r | |
164 | typedef\r | |
165 | EFI_STATUS\r | |
166 | (EFIAPI *VIRTIO_SET_QUEUE_ADDRESS) (\r | |
167 | IN VIRTIO_DEVICE_PROTOCOL *This,\r | |
168 | IN UINT32 Address\r | |
169 | );\r | |
170 | \r | |
171 | /**\r | |
172 | \r | |
173 | Write the queue select field in the Virtio Header.\r | |
174 | \r | |
175 | Writing to the queue select field sets the index of the queue to which\r | |
176 | operations such as SetQueueAlign and GetQueueNumMax apply.\r | |
177 | \r | |
178 | @param[in] This This instance of VIRTIO_DEVICE_PROTOCOL\r | |
179 | \r | |
180 | @param[in] Index The index of the queue to select\r | |
181 | \r | |
182 | @retval EFI_SUCCESS The data was written successfully.\r | |
183 | @retval EFI_UNSUPPORTED The underlying IO device doesn't support the\r | |
184 | provided address offset and write size.\r | |
185 | **/\r | |
186 | typedef\r | |
187 | EFI_STATUS\r | |
188 | (EFIAPI *VIRTIO_SET_QUEUE_SEL) (\r | |
189 | IN VIRTIO_DEVICE_PROTOCOL *This,\r | |
190 | IN UINT16 Index\r | |
191 | );\r | |
192 | \r | |
193 | /**\r | |
194 | \r | |
195 | Write the queue notify field in the Virtio Header.\r | |
196 | \r | |
197 | @param[in] This This instance of VIRTIO_DEVICE_PROTOCOL\r | |
198 | \r | |
199 | @param[in] Address The 32-bit Queue Notify field\r | |
200 | \r | |
201 | @retval EFI_SUCCESS The data was written successfully.\r | |
202 | @retval EFI_UNSUPPORTED The underlying IO device doesn't support the\r | |
203 | provided address offset and write size.\r | |
204 | **/\r | |
205 | typedef\r | |
206 | EFI_STATUS\r | |
207 | (EFIAPI *VIRTIO_SET_QUEUE_NOTIFY) (\r | |
208 | IN VIRTIO_DEVICE_PROTOCOL *This,\r | |
209 | IN UINT16 Index\r | |
210 | );\r | |
211 | \r | |
212 | /**\r | |
213 | Write the queue alignment field in the Virtio Header.\r | |
214 | \r | |
215 | The queue to which the alignment applies is selected by the Queue Select\r | |
216 | field.\r | |
217 | \r | |
218 | Note: This operation is not implemented by the VirtIo over PCI. The PCI\r | |
219 | implementation of this protocol returns EFI_SUCCESS.\r | |
220 | \r | |
221 | @param[in] This This instance of VIRTIO_DEVICE_PROTOCOL\r | |
222 | \r | |
223 | @param[in] Alignment The alignment boundary of the Used Ring in bytes.\r | |
224 | Must be a power of 2.\r | |
225 | \r | |
226 | @retval EFI_SUCCESS The data was written successfully.\r | |
227 | @retval EFI_UNSUPPORTED The underlying IO device doesn't support the\r | |
228 | provided address offset and write size.\r | |
229 | **/\r | |
230 | typedef\r | |
231 | EFI_STATUS\r | |
232 | (EFIAPI *VIRTIO_SET_QUEUE_ALIGN) (\r | |
233 | IN VIRTIO_DEVICE_PROTOCOL *This,\r | |
234 | IN UINT32 Alignment\r | |
235 | );\r | |
236 | \r | |
237 | /**\r | |
238 | Write the guest page size.\r | |
239 | \r | |
240 | Note: This operation is not implemented by the VirtIo over PCI. The PCI\r | |
241 | implementation of this protocol returns EFI_SUCCESS.\r | |
242 | \r | |
243 | @param[in] This This instance of VIRTIO_DEVICE_PROTOCOL\r | |
244 | \r | |
245 | @param[in] PageSize Size of the Guest page in bytes.\r | |
246 | Must be a power of 2.\r | |
247 | \r | |
248 | @retval EFI_SUCCESS The data was written successfully.\r | |
249 | @retval EFI_UNSUPPORTED The underlying IO device doesn't support the\r | |
250 | provided address offset and write size.\r | |
251 | **/\r | |
252 | typedef\r | |
253 | EFI_STATUS\r | |
254 | (EFIAPI *VIRTIO_SET_PAGE_SIZE) (\r | |
255 | IN VIRTIO_DEVICE_PROTOCOL *This,\r | |
256 | IN UINT32 PageSize\r | |
257 | );\r | |
258 | \r | |
259 | /**\r | |
260 | \r | |
261 | Get the size of the virtqueue selected by the queue select field.\r | |
262 | \r | |
263 | See Virtio spec Section 2.3\r | |
264 | \r | |
265 | @param[in] This This instance of VIRTIO_DEVICE_PROTOCOL\r | |
266 | \r | |
267 | @param[out] QueueNumMax The size of the virtqueue in bytes.\r | |
268 | Always a power of 2.\r | |
269 | \r | |
270 | @retval EFI_SUCCESS The data was read successfully.\r | |
271 | @retval EFI_UNSUPPORTED The underlying IO device doesn't support the\r | |
272 | provided address offset and read size.\r | |
273 | @retval EFI_INVALID_PARAMETER QueueNumMax is NULL\r | |
274 | **/\r | |
275 | typedef\r | |
276 | EFI_STATUS\r | |
277 | (EFIAPI *VIRTIO_GET_QUEUE_NUM_MAX) (\r | |
278 | IN VIRTIO_DEVICE_PROTOCOL *This,\r | |
279 | OUT UINT16 *QueueNumMax\r | |
280 | );\r | |
281 | \r | |
282 | /**\r | |
283 | \r | |
284 | Write to the QueueNum field in the Virtio Header.\r | |
285 | \r | |
286 | This function only applies to Virtio-MMIO and may be a stub for other\r | |
287 | implementations. See Virtio Spec appendix X.\r | |
288 | \r | |
289 | @param[in] This This instance of VIRTIO_DEVICE_PROTOCOL\r | |
290 | \r | |
291 | @param[in] QueueSize The number of elements in the queue.\r | |
292 | \r | |
293 | @retval EFI_SUCCESS The data was written successfully.\r | |
294 | @retval EFI_UNSUPPORTED The underlying IO device doesn't support the\r | |
295 | provided address offset and write size.\r | |
296 | **/\r | |
297 | typedef\r | |
298 | EFI_STATUS\r | |
299 | (EFIAPI *VIRTIO_SET_QUEUE_NUM) (\r | |
300 | IN VIRTIO_DEVICE_PROTOCOL *This,\r | |
301 | IN UINT16 QueueSize\r | |
302 | );\r | |
303 | \r | |
304 | /**\r | |
305 | \r | |
306 | Get the DeviceStatus field from the Virtio Header.\r | |
307 | \r | |
308 | @param[in] This This instance of VIRTIO_DEVICE_PROTOCOL\r | |
309 | \r | |
310 | @param[out] DeviceStatus The 8-bit value for the Device status field\r | |
311 | \r | |
312 | @retval EFI_SUCCESS The data was read successfully.\r | |
313 | @retval EFI_UNSUPPORTED The underlying IO device doesn't support the\r | |
314 | provided address offset and read size.\r | |
315 | @retval EFI_INVALID_PARAMETER DeviceStatus is NULL\r | |
316 | **/\r | |
317 | typedef\r | |
318 | EFI_STATUS\r | |
319 | (EFIAPI *VIRTIO_GET_DEVICE_STATUS) (\r | |
320 | IN VIRTIO_DEVICE_PROTOCOL *This,\r | |
321 | OUT UINT8 *DeviceStatus\r | |
322 | );\r | |
323 | \r | |
324 | /**\r | |
325 | \r | |
326 | Write the DeviceStatus field in the Virtio Header.\r | |
327 | \r | |
328 | @param[in] This This instance of VIRTIO_DEVICE_PROTOCOL\r | |
329 | \r | |
330 | @param[in] DeviceStatus The 8-bit value for the Device status field\r | |
331 | \r | |
332 | @retval EFI_SUCCESS The data was written successfully.\r | |
333 | @retval EFI_UNSUPPORTED The underlying IO device doesn't support the\r | |
334 | provided address offset and write size.\r | |
335 | **/\r | |
336 | typedef\r | |
337 | EFI_STATUS\r | |
338 | (EFIAPI *VIRTIO_SET_DEVICE_STATUS) (\r | |
339 | IN VIRTIO_DEVICE_PROTOCOL *This,\r | |
340 | IN UINT8 DeviceStatus\r | |
341 | );\r | |
342 | \r | |
343 | \r | |
344 | ///\r | |
345 | /// This protocol provides an abstraction over the VirtIo transport layer\r | |
346 | ///\r | |
347 | /// DISCLAIMER: this protocol is a work in progress, and should not be used\r | |
348 | /// outside of the EDK II tree.\r | |
349 | ///\r | |
350 | struct _VIRTIO_DEVICE_PROTOCOL {\r | |
351 | /// VirtIo Specification Revision encoded with VIRTIO_SPEC_REVISION()\r | |
352 | UINT32 Revision;\r | |
353 | /// From the Virtio Spec\r | |
354 | INT32 SubSystemDeviceId;\r | |
355 | \r | |
356 | VIRTIO_GET_DEVICE_FEATURES GetDeviceFeatures;\r | |
357 | VIRTIO_SET_GUEST_FEATURES SetGuestFeatures;\r | |
358 | \r | |
359 | VIRTIO_GET_QUEUE_ADDRESS GetQueueAddress;\r | |
360 | VIRTIO_SET_QUEUE_ADDRESS SetQueueAddress;\r | |
361 | \r | |
362 | VIRTIO_SET_QUEUE_SEL SetQueueSel;\r | |
363 | \r | |
364 | VIRTIO_SET_QUEUE_NOTIFY SetQueueNotify;\r | |
365 | \r | |
366 | VIRTIO_SET_QUEUE_ALIGN SetQueueAlign;\r | |
367 | VIRTIO_SET_PAGE_SIZE SetPageSize;\r | |
368 | \r | |
369 | VIRTIO_GET_QUEUE_NUM_MAX GetQueueNumMax;\r | |
370 | VIRTIO_SET_QUEUE_NUM SetQueueNum;\r | |
371 | \r | |
372 | VIRTIO_GET_DEVICE_STATUS GetDeviceStatus;\r | |
373 | VIRTIO_SET_DEVICE_STATUS SetDeviceStatus;\r | |
374 | \r | |
375 | // Functions to read/write Device Specific headers\r | |
376 | VIRTIO_DEVICE_WRITE WriteDevice;\r | |
377 | VIRTIO_DEVICE_READ ReadDevice;\r | |
378 | };\r | |
379 | \r | |
380 | extern EFI_GUID gVirtioDeviceProtocolGuid;\r | |
381 | \r | |
382 | #endif\r |