1 |
|
|
/*************************************************************************** |
2 |
|
|
* Copyright (c) 2024 Microsoft Corporation |
3 |
|
|
* |
4 |
|
|
* This program and the accompanying materials are made available under the |
5 |
|
|
* terms of the MIT License which is available at |
6 |
|
|
* https://opensource.org/licenses/MIT. |
7 |
|
|
* |
8 |
|
|
* SPDX-License-Identifier: MIT |
9 |
|
|
**************************************************************************/ |
10 |
|
|
|
11 |
|
|
|
12 |
|
|
/**************************************************************************/ |
13 |
|
|
/**************************************************************************/ |
14 |
|
|
/** */ |
15 |
|
|
/** FileX Component */ |
16 |
|
|
/** */ |
17 |
|
|
/** FileX NAND FLASH Simulator Driver */ |
18 |
|
|
/** */ |
19 |
|
|
/**************************************************************************/ |
20 |
|
|
/**************************************************************************/ |
21 |
|
|
|
22 |
|
|
|
23 |
|
|
/* Include necessary system files. */ |
24 |
|
|
|
25 |
|
|
#include "fx_api.h" |
26 |
|
|
#include "lx_api.h" |
27 |
|
|
|
28 |
|
|
|
29 |
|
|
/* Create a NAND flash control block. */ |
30 |
|
|
|
31 |
|
|
LX_NAND_FLASH nand_flash; |
32 |
|
|
|
33 |
|
|
/* Memory buffer size should be at least 7 * total block count + 2 * page size, |
34 |
|
|
that is 7 * 1024 + 2 * 528 = 8224 bytes */ |
35 |
|
|
ULONG lx_memory_buffer[8224 / sizeof (ULONG)]; |
36 |
|
|
|
37 |
|
|
/* Define the NAND flash simulation initialization function. */ |
38 |
|
|
|
39 |
|
|
UINT _lx_nand_flash_simulator_initialize(LX_NAND_FLASH *nand_flash); |
40 |
|
|
VOID _fx_nand_flash_read_sectors(ULONG logical_sector, ULONG sectors, UCHAR *destination_buffer); |
41 |
|
|
VOID _fx_nand_flash_write_sectors(ULONG logical_sector, ULONG sectors, UCHAR *source_buffer); |
42 |
|
|
|
43 |
|
|
|
44 |
|
|
/* The simulated NAND driver relies on the fx_media_format call to be made prior to |
45 |
|
|
the fx_media_open call. |
46 |
|
|
|
47 |
|
|
fx_media_format(&ram_disk, |
48 |
|
|
_fx_nand_sim_driver, // Driver entry |
49 |
|
|
FX_NULL, // Unused |
50 |
|
|
media_memory, // Media buffer pointer |
51 |
|
|
sizeof(media_memory), // Media buffer size |
52 |
|
|
"MY_NAND_DISK", // Volume Name |
53 |
|
|
1, // Number of FATs |
54 |
|
|
32, // Directory Entries |
55 |
|
|
0, // Hidden sectors |
56 |
|
|
120, // Total sectors |
57 |
|
|
2048, // Sector size |
58 |
|
|
1, // Sectors per cluster |
59 |
|
|
1, // Heads |
60 |
|
|
1); // Sectors per track |
61 |
|
|
|
62 |
|
|
*/ |
63 |
|
|
|
64 |
|
|
|
65 |
|
|
VOID _fx_nand_flash_simulator_driver(FX_MEDIA *media_ptr); |
66 |
|
|
|
67 |
|
|
|
68 |
|
|
/**************************************************************************/ |
69 |
|
|
/* */ |
70 |
|
|
/* FUNCTION RELEASE */ |
71 |
|
|
/* */ |
72 |
|
|
/* _fx_nand_simulator_driver PORTABLE C */ |
73 |
|
|
/* 6.2.1 */ |
74 |
|
|
/* AUTHOR */ |
75 |
|
|
/* */ |
76 |
|
|
/* William E. Lamie, Microsoft Corporation */ |
77 |
|
|
/* */ |
78 |
|
|
/* DESCRIPTION */ |
79 |
|
|
/* */ |
80 |
|
|
/* This function is the entry point to the generic NAND simulated */ |
81 |
|
|
/* disk driver that is delivered with the flash wear leveling product */ |
82 |
|
|
/* LevelX. */ |
83 |
|
|
/* */ |
84 |
|
|
/* This driver also serves as a template for developing other LevelX */ |
85 |
|
|
/* NAND flash drivers for actual flash devices. Simply replace the */ |
86 |
|
|
/* read/write sector logic with calls to read/write from the */ |
87 |
|
|
/* appropriate physical device access functions. */ |
88 |
|
|
/* */ |
89 |
|
|
/* FileX NAND FLASH structures look like the following: */ |
90 |
|
|
/* */ |
91 |
|
|
/* Logical Sector Contents */ |
92 |
|
|
/* */ |
93 |
|
|
/* 0 Boot record */ |
94 |
|
|
/* 1 FAT Area Start */ |
95 |
|
|
/* +FAT Sectors Root Directory Start */ |
96 |
|
|
/* +Directory Sectors Data Sector Start */ |
97 |
|
|
/* */ |
98 |
|
|
/* */ |
99 |
|
|
/* INPUT */ |
100 |
|
|
/* */ |
101 |
|
|
/* media_ptr Media control block pointer */ |
102 |
|
|
/* */ |
103 |
|
|
/* OUTPUT */ |
104 |
|
|
/* */ |
105 |
|
|
/* None */ |
106 |
|
|
/* */ |
107 |
|
|
/* CALLS */ |
108 |
|
|
/* */ |
109 |
|
|
/* _lx_nand_flash_close Close NAND flash manager */ |
110 |
|
|
/* _lx_nand_flash_open Open NAND flash manager */ |
111 |
|
|
/* _lx_nand_flash_sector_read Read a NAND sector */ |
112 |
|
|
/* _lx_nand_flash_sector_release Release a NAND sector */ |
113 |
|
|
/* _lx_nand_flash_sector_write Write a NAND sector */ |
114 |
|
|
/* */ |
115 |
|
|
/* CALLED BY */ |
116 |
|
|
/* */ |
117 |
|
|
/* FileX System Functions */ |
118 |
|
|
/* */ |
119 |
|
|
/* RELEASE HISTORY */ |
120 |
|
|
/* */ |
121 |
|
|
/* DATE NAME DESCRIPTION */ |
122 |
|
|
/* */ |
123 |
|
|
/* 05-19-2020 William E. Lamie Initial Version 6.0 */ |
124 |
|
|
/* 09-30-2020 William E. Lamie Modified comment(s), */ |
125 |
|
|
/* resulting in version 6.1 */ |
126 |
|
|
/* 06-02-2021 Bhupendra Naphade Modified comment(s), */ |
127 |
|
|
/* resulting in version 6.1.7 */ |
128 |
|
|
/* 03-08-2023 Xiuwen Cai Modified comment(s), */ |
129 |
|
|
/* changed to use new API, */ |
130 |
|
|
/* resulting in version 6.2.1 */ |
131 |
|
|
/* */ |
132 |
|
|
/**************************************************************************/ |
133 |
|
|
VOID _fx_nand_flash_simulator_driver(FX_MEDIA *media_ptr) |
134 |
|
|
{ |
135 |
|
|
|
136 |
|
|
ULONG logical_sector; |
137 |
|
|
ULONG count; |
138 |
|
|
UCHAR *buffer; |
139 |
|
|
UINT status; |
140 |
|
|
|
141 |
|
|
|
142 |
|
|
/* There are several useful/important pieces of information contained in the media |
143 |
|
|
structure, some of which are supplied by FileX and others are for the driver to |
144 |
|
|
setup. The following is a summary of the necessary FX_MEDIA structure members: |
145 |
|
|
|
146 |
|
|
FX_MEDIA Member Meaning |
147 |
|
|
|
148 |
|
|
fx_media_driver_request FileX request type. Valid requests from FileX are |
149 |
|
|
as follows: |
150 |
|
|
|
151 |
|
|
FX_DRIVER_READ |
152 |
|
|
FX_DRIVER_WRITE |
153 |
|
|
FX_DRIVER_FLUSH |
154 |
|
|
FX_DRIVER_ABORT |
155 |
|
|
FX_DRIVER_INIT |
156 |
|
|
FX_DRIVER_BOOT_READ |
157 |
|
|
FX_DRIVER_RELEASE_SECTORS |
158 |
|
|
FX_DRIVER_BOOT_WRITE |
159 |
|
|
FX_DRIVER_UNINIT |
160 |
|
|
|
161 |
|
|
fx_media_driver_status This value is RETURNED by the driver. If the |
162 |
|
|
operation is successful, this field should be |
163 |
|
|
set to FX_SUCCESS for before returning. Otherwise, |
164 |
|
|
if an error occurred, this field should be set |
165 |
|
|
to FX_IO_ERROR. |
166 |
|
|
|
167 |
|
|
fx_media_driver_buffer Pointer to buffer to read or write sector data. |
168 |
|
|
This is supplied by FileX. |
169 |
|
|
|
170 |
|
|
fx_media_driver_logical_sector Logical sector FileX is requesting. |
171 |
|
|
|
172 |
|
|
fx_media_driver_sectors Number of sectors FileX is requesting. |
173 |
|
|
|
174 |
|
|
|
175 |
|
|
The following is a summary of the optional FX_MEDIA structure members: |
176 |
|
|
|
177 |
|
|
FX_MEDIA Member Meaning |
178 |
|
|
|
179 |
|
|
fx_media_driver_info Pointer to any additional information or memory. |
180 |
|
|
This is optional for the driver use and is setup |
181 |
|
|
from the fx_media_open call. The RAM disk uses |
182 |
|
|
this pointer for the RAM disk memory itself. |
183 |
|
|
|
184 |
|
|
fx_media_driver_write_protect The DRIVER sets this to FX_TRUE when media is write |
185 |
|
|
protected. This is typically done in initialization, |
186 |
|
|
but can be done anytime. |
187 |
|
|
|
188 |
|
|
fx_media_driver_free_sector_update The DRIVER sets this to FX_TRUE when it needs to |
189 |
|
|
know when clusters are released. This is important |
190 |
|
|
for FLASH wear-leveling drivers. |
191 |
|
|
|
192 |
|
|
fx_media_driver_system_write FileX sets this flag to FX_TRUE if the sector being |
193 |
|
|
written is a system sector, e.g., a boot, FAT, or |
194 |
|
|
directory sector. The driver may choose to use this |
195 |
|
|
to initiate error recovery logic for greater fault |
196 |
|
|
tolerance. |
197 |
|
|
|
198 |
|
|
fx_media_driver_data_sector_read FileX sets this flag to FX_TRUE if the sector(s) being |
199 |
|
|
read are file data sectors, i.e., NOT system sectors. |
200 |
|
|
|
201 |
|
|
fx_media_driver_sector_type FileX sets this variable to the specific type of |
202 |
|
|
sector being read or written. The following sector |
203 |
|
|
types are identified: |
204 |
|
|
|
205 |
|
|
FX_UNKNOWN_SECTOR |
206 |
|
|
FX_BOOT_SECTOR |
207 |
|
|
FX_FAT_SECTOR |
208 |
|
|
FX_DIRECTORY_SECTOR |
209 |
|
|
FX_DATA_SECTOR |
210 |
|
|
*/ |
211 |
|
|
|
212 |
|
|
/* Process the driver request specified in the media control block. */ |
213 |
|
|
switch(media_ptr -> fx_media_driver_request) |
214 |
|
|
{ |
215 |
|
|
|
216 |
|
|
case FX_DRIVER_READ: |
217 |
|
|
{ |
218 |
|
|
|
219 |
|
|
/* Read sector(s) from NAND flash. */ |
220 |
|
|
logical_sector = media_ptr -> fx_media_driver_logical_sector; |
221 |
|
|
count = media_ptr -> fx_media_driver_sectors; |
222 |
|
|
buffer = (UCHAR *) media_ptr -> fx_media_driver_buffer; |
223 |
|
|
while (count) |
224 |
|
|
{ |
225 |
|
|
|
226 |
|
|
/* Call LevelX to read one flash sector. */ |
227 |
|
|
status = _lx_nand_flash_sector_read(&nand_flash, logical_sector, buffer); |
228 |
|
|
|
229 |
|
|
/* Determine if the read was successful. */ |
230 |
|
|
if (status != LX_SUCCESS) |
231 |
|
|
{ |
232 |
|
|
|
233 |
|
|
/* Return an I/O error to FileX. */ |
234 |
|
|
media_ptr -> fx_media_driver_status = FX_IO_ERROR; |
235 |
|
|
|
236 |
|
|
return; |
237 |
|
|
} |
238 |
|
|
|
239 |
|
|
/* Successful sector read. */ |
240 |
|
|
count--; |
241 |
|
|
logical_sector++; |
242 |
|
|
buffer += media_ptr -> fx_media_bytes_per_sector; |
243 |
|
|
} |
244 |
|
|
/* Successful driver request. */ |
245 |
|
|
media_ptr -> fx_media_driver_status = FX_SUCCESS; |
246 |
|
|
break; |
247 |
|
|
} |
248 |
|
|
|
249 |
|
|
case FX_DRIVER_WRITE: |
250 |
|
|
{ |
251 |
|
|
|
252 |
|
|
/* Write sector(s) to NAND flash. */ |
253 |
|
|
logical_sector = media_ptr -> fx_media_driver_logical_sector; |
254 |
|
|
count = media_ptr -> fx_media_driver_sectors; |
255 |
|
|
buffer = (UCHAR *) media_ptr -> fx_media_driver_buffer; |
256 |
|
|
while (count) |
257 |
|
|
{ |
258 |
|
|
|
259 |
|
|
/* Call LevelX to write a sector. */ |
260 |
|
|
status = _lx_nand_flash_sector_write(&nand_flash, logical_sector, buffer); |
261 |
|
|
|
262 |
|
|
/* Determine if the write was successful. */ |
263 |
|
|
if (status != LX_SUCCESS) |
264 |
|
|
{ |
265 |
|
|
|
266 |
|
|
/* Return an I/O error to FileX. */ |
267 |
|
|
media_ptr -> fx_media_driver_status = FX_IO_ERROR; |
268 |
|
|
|
269 |
|
|
return; |
270 |
|
|
} |
271 |
|
|
|
272 |
|
|
/* Successful sector write. */ |
273 |
|
|
count--; |
274 |
|
|
logical_sector++; |
275 |
|
|
buffer += media_ptr -> fx_media_bytes_per_sector; |
276 |
|
|
} |
277 |
|
|
|
278 |
|
|
/* Successful driver request. */ |
279 |
|
|
media_ptr -> fx_media_driver_status = FX_SUCCESS; |
280 |
|
|
break; |
281 |
|
|
} |
282 |
|
|
|
283 |
|
|
case FX_DRIVER_RELEASE_SECTORS: |
284 |
|
|
{ |
285 |
|
|
|
286 |
|
|
/* Release the mapping of this sector. */ |
287 |
|
|
logical_sector = media_ptr -> fx_media_driver_logical_sector; |
288 |
|
|
count = media_ptr -> fx_media_driver_sectors; |
289 |
|
|
while (count) |
290 |
|
|
{ |
291 |
|
|
|
292 |
|
|
/* Call LevelX to release a sector mapping. */ |
293 |
|
|
status = _lx_nand_flash_sector_release(&nand_flash, logical_sector); |
294 |
|
|
|
295 |
|
|
/* Determine if the sector release was successful. */ |
296 |
|
|
if (status != LX_SUCCESS) |
297 |
|
|
{ |
298 |
|
|
|
299 |
|
|
/* Return an I/O error to FileX. */ |
300 |
|
|
media_ptr -> fx_media_driver_status = FX_IO_ERROR; |
301 |
|
|
|
302 |
|
|
return; |
303 |
|
|
} |
304 |
|
|
|
305 |
|
|
/* Successful sector release. */ |
306 |
|
|
count--; |
307 |
|
|
logical_sector++; |
308 |
|
|
} |
309 |
|
|
|
310 |
|
|
/* Successful driver request. */ |
311 |
|
|
media_ptr -> fx_media_driver_status = FX_SUCCESS; |
312 |
|
|
break; |
313 |
|
|
} |
314 |
|
|
|
315 |
|
|
case FX_DRIVER_FLUSH: |
316 |
|
|
{ |
317 |
|
|
|
318 |
|
|
/* Return driver success. */ |
319 |
|
|
media_ptr -> fx_media_driver_status = FX_SUCCESS; |
320 |
|
|
break; |
321 |
|
|
} |
322 |
|
|
|
323 |
|
|
case FX_DRIVER_ABORT: |
324 |
|
|
{ |
325 |
|
|
|
326 |
|
|
/* Return driver success. */ |
327 |
|
|
media_ptr -> fx_media_driver_status = FX_SUCCESS; |
328 |
|
|
break; |
329 |
|
|
} |
330 |
|
|
|
331 |
|
|
case FX_DRIVER_INIT: |
332 |
|
|
{ |
333 |
|
|
|
334 |
|
|
/* FLASH drivers are responsible for setting several fields in the |
335 |
|
|
media structure, as follows: |
336 |
|
|
|
337 |
|
|
media_ptr -> fx_media_driver_free_sector_update |
338 |
|
|
media_ptr -> fx_media_driver_write_protect |
339 |
|
|
|
340 |
|
|
The fx_media_driver_free_sector_update flag is used to instruct |
341 |
|
|
FileX to inform the driver whenever sectors are not being used. |
342 |
|
|
This is especially useful for FLASH managers so they don't have |
343 |
|
|
maintain mapping for sectors no longer in use. |
344 |
|
|
|
345 |
|
|
The fx_media_driver_write_protect flag can be set anytime by the |
346 |
|
|
driver to indicate the media is not writable. Write attempts made |
347 |
|
|
when this flag is set are returned as errors. */ |
348 |
|
|
|
349 |
|
|
/* Perform basic initialization here... since the boot record is going |
350 |
|
|
to be read subsequently and again for volume name requests. */ |
351 |
|
|
|
352 |
|
|
/* With flash wear leveling, FileX should tell wear leveling when sectors |
353 |
|
|
are no longer in use. */ |
354 |
|
|
media_ptr -> fx_media_driver_free_sector_update = FX_TRUE; |
355 |
|
|
|
356 |
|
|
/* Open the NAND flash simulation. */ |
357 |
|
|
status = _lx_nand_flash_open(&nand_flash, "sim nand flash", _lx_nand_flash_simulator_initialize, lx_memory_buffer, sizeof(lx_memory_buffer)); |
358 |
|
|
|
359 |
|
|
/* Determine if the flash open was successful. */ |
360 |
|
|
if (status != LX_SUCCESS) |
361 |
|
|
{ |
362 |
|
|
|
363 |
|
|
/* Return an I/O error to FileX. */ |
364 |
|
|
media_ptr -> fx_media_driver_status = FX_IO_ERROR; |
365 |
|
|
|
366 |
|
|
return; |
367 |
|
|
} |
368 |
|
|
|
369 |
|
|
/* Successful driver request. */ |
370 |
|
|
media_ptr -> fx_media_driver_status = FX_SUCCESS; |
371 |
|
|
break; |
372 |
|
|
} |
373 |
|
|
|
374 |
|
|
case FX_DRIVER_UNINIT: |
375 |
|
|
{ |
376 |
|
|
|
377 |
|
|
/* There is nothing to do in this case for the RAM driver. For actual |
378 |
|
|
devices some shutdown processing may be necessary. */ |
379 |
|
|
|
380 |
|
|
/* Close the NAND flash simulation. */ |
381 |
|
|
status = _lx_nand_flash_close(&nand_flash); |
382 |
|
|
|
383 |
|
|
/* Determine if the flash close was successful. */ |
384 |
|
|
if (status != LX_SUCCESS) |
385 |
|
|
{ |
386 |
|
|
|
387 |
|
|
/* Return an I/O error to FileX. */ |
388 |
|
|
media_ptr -> fx_media_driver_status = FX_IO_ERROR; |
389 |
|
|
|
390 |
|
|
return; |
391 |
|
|
} |
392 |
|
|
|
393 |
|
|
/* Successful driver request. */ |
394 |
|
|
media_ptr -> fx_media_driver_status = FX_SUCCESS; |
395 |
|
|
break; |
396 |
|
|
} |
397 |
|
|
|
398 |
|
|
case FX_DRIVER_BOOT_READ: |
399 |
|
|
{ |
400 |
|
|
|
401 |
|
|
/* Read the boot record and return to the caller. */ |
402 |
|
|
status = _lx_nand_flash_sector_read(&nand_flash, 0, (UCHAR *) media_ptr -> fx_media_driver_buffer); |
403 |
|
|
|
404 |
|
|
/* Determine if the read was successful. */ |
405 |
|
|
if (status != LX_SUCCESS) |
406 |
|
|
{ |
407 |
|
|
|
408 |
|
|
/* Return an I/O error to FileX. */ |
409 |
|
|
media_ptr -> fx_media_driver_status = FX_IO_ERROR; |
410 |
|
|
|
411 |
|
|
return; |
412 |
|
|
} |
413 |
|
|
|
414 |
|
|
/* Successful driver request. */ |
415 |
|
|
media_ptr -> fx_media_driver_status = FX_SUCCESS; |
416 |
|
|
break; |
417 |
|
|
} |
418 |
|
|
|
419 |
|
|
case FX_DRIVER_BOOT_WRITE: |
420 |
|
|
{ |
421 |
|
|
|
422 |
|
|
/* Write the boot record and return to the caller. */ |
423 |
|
|
status = _lx_nand_flash_sector_write(&nand_flash, 0, (UCHAR *) media_ptr -> fx_media_driver_buffer); |
424 |
|
|
|
425 |
|
|
/* Determine if the write was successful. */ |
426 |
|
|
if (status != LX_SUCCESS) |
427 |
|
|
{ |
428 |
|
|
|
429 |
|
|
/* Return an I/O error to FileX. */ |
430 |
|
|
media_ptr -> fx_media_driver_status = FX_IO_ERROR; |
431 |
|
|
|
432 |
|
|
return; |
433 |
|
|
} |
434 |
|
|
|
435 |
|
|
/* Successful driver request. */ |
436 |
|
|
media_ptr -> fx_media_driver_status = FX_SUCCESS; |
437 |
|
|
break ; |
438 |
|
|
} |
439 |
|
|
|
440 |
|
|
default: |
441 |
|
|
{ |
442 |
|
|
|
443 |
|
|
/* Invalid driver request. */ |
444 |
|
|
media_ptr -> fx_media_driver_status = FX_IO_ERROR; |
445 |
|
|
break; |
446 |
|
|
} |
447 |
|
|
} |
448 |
|
|
} |
449 |
|
|
|