1 | /*␊ |
2 | * Supplemental ramdisk functions for the multiboot ramdisk driver.␊ |
3 | * Copyright 2009 Tamas Kosarszky. All rights reserved.␊ |
4 | *␊ |
5 | */␊ |
6 | ␊ |
7 | #include "libsaio.h"␊ |
8 | #include "bootstruct.h"␊ |
9 | #include "multiboot.h"␊ |
10 | #include "ramdisk.h"␊ |
11 | ␊ |
12 | struct multiboot_info * gRAMDiskMI = NULL;␊ |
13 | ␊ |
14 | config_file_t ramdiskConfig;␉␉ ␊ |
15 | ␊ |
16 | // gRAMDiskVolume holds the bvr for the mounted ramdisk image.␊ |
17 | BVRef gRAMDiskVolume = NULL;␊ |
18 | bool gRAMDiskBTAliased = false;␊ |
19 | char gRAMDiskFile[512];␊ |
20 | ␊ |
21 | long (*LoadExtraDrivers_p)(FileLoadDrivers_t FileLoadDrivers_p) = NULL;␊ |
22 | int (*p_ramdiskReadBytes)( int biosdev, unsigned int blkno,␊ |
23 | ␉␉␉␉␉␉ unsigned int byteoff,␊ |
24 | ␉␉␉␉␉␉ unsigned int byteCount, void * buffer ) = NULL;␊ |
25 | int (*p_get_ramdisk_info)(int biosdev, struct driveInfo *dip) = NULL;␊ |
26 | ␊ |
27 | int multibootRamdiskReadBytes( int biosdev, unsigned int blkno,␊ |
28 | ␉␉␉␉␉␉␉␉␉ unsigned int byteoff,␊ |
29 | ␉␉␉␉␉␉␉␉␉ unsigned int byteCount, void * buffer );␊ |
30 | int multiboot_get_ramdisk_info(int biosdev, struct driveInfo *dip);␊ |
31 | static long multiboot_LoadExtraDrivers(FileLoadDrivers_t FileLoadDrivers_p);␊ |
32 | ␊ |
33 | ␊ |
34 | // Notify OS X that a ramdisk has been setup. XNU with attach this to /dev/md0 (WARNING : md0Ramdisk MUST BE EXTERN FOR NBI COMPTATIBILITY)␊ |
35 | void md0Ramdisk()␊ |
36 | {␊ |
37 | ␉RAMDiskParam ramdiskPtr;␊ |
38 | ␉char filename[512];␊ |
39 | ␉const char* override_filename = 0;␊ |
40 | ␉int fh = -1;␊ |
41 | ␉int len;␊ |
42 | ␉␊ |
43 | ␉if(getValueForKey(kMD0Image, &override_filename, &len, ␊ |
44 | ␉␉␉␉ DEFAULT_BOOT_CONFIG))␊ |
45 | ␉{␊ |
46 | ␉␉// Use user specified md0 file␊ |
47 | ␉␉snprintf(filename, sizeof(filename) ,"%s", override_filename);␊ |
48 | ␉␉fh = open(filename);␊ |
49 | ␉␉␊ |
50 | ␉␉if(fh < 0)␊ |
51 | ␉␉{␊ |
52 | ␉␉␉snprintf(filename, sizeof(filename) ,"bt(0,0)/Extra/%s", override_filename);␊ |
53 | ␉␉␉fh = open(filename);␊ |
54 | ␉␉␉␊ |
55 | ␉␉␉if(fh < 0)␊ |
56 | ␉␉␉{␊ |
57 | ␉␉␉␉snprintf(filename, sizeof(filename) ,"rd(0,0)/Extra/%s", override_filename);␊ |
58 | ␉␉␉␉fh = open(filename);␊ |
59 | ␊ |
60 | ␉␉␉␉if(fh < 0)␊ |
61 | ␉␉␉␉{␊ |
62 | ␉␉␉␉␉snprintf(filename, sizeof(filename) ,"/Extra/%s", override_filename);␊ |
63 | ␉␉␉␉␉fh = open(filename);␊ |
64 | ␉␉␉␉}␊ |
65 | ␉␉␉}␊ |
66 | ␉␉}␊ |
67 | ␉}␊ |
68 | ␊ |
69 | ␉if(fh < 0)␊ |
70 | ␉{␊ |
71 | ␉␉snprintf(filename, sizeof(filename) ,"bt(0,0)/Extra/Postboot.img");␊ |
72 | ␉␉fh = open(filename);␊ |
73 | ␉␉␊ |
74 | ␉␉if(fh < 0)␊ |
75 | ␉␉{␊ |
76 | ␉␉␉snprintf(filename, sizeof(filename) ,"rd(0,0)/Extra/Postboot.img");␊ |
77 | ␉␉␉fh = open(filename);␊ |
78 | ␊ |
79 | ␉␉␉if(fh < 0)␊ |
80 | ␉␉␉{␊ |
81 | ␉␉␉␉snprintf(filename, sizeof(filename) ,"/Extra/Postboot.img");␉// Check /Extra if not in rd(0,0)␊ |
82 | ␉␉␉␉fh = open(filename);␊ |
83 | ␉␉␉}␊ |
84 | ␉␉}␊ |
85 | ␉}␊ |
86 | ␊ |
87 | ␉if (fh >= 0)␊ |
88 | ␉{␊ |
89 | ␉␉verbose("Enabling ramdisk %s\n", filename);␊ |
90 | ␊ |
91 | ␉␉ramdiskPtr.size = file_size(fh);␊ |
92 | ␉␉ramdiskPtr.base = AllocateKernelMemory(ramdiskPtr.size);␊ |
93 | ␊ |
94 | ␉␉if(ramdiskPtr.size && ramdiskPtr.base)␊ |
95 | ␉␉{␊ |
96 | ␉␉␉// Read new ramdisk image contents in kernel memory.␊ |
97 | ␉␉␉if (read(fh, (char*) ramdiskPtr.base, ramdiskPtr.size) == ramdiskPtr.size)␊ |
98 | ␉␉␉{␉␉␉␉␊ |
99 | ␊ |
100 | AllocateMemoryRange("RAMDisk", ramdiskPtr.base, ramdiskPtr.size);␊ |
101 | ␊ |
102 | ␉␉␉␉Node* node = DT__FindNode("/chosen/memory-map", false);␊ |
103 | ␉␉␉␉if(node != NULL)␊ |
104 | ␉␉␉␉{␊ |
105 | ␉␉␉␉␉DT__AddProperty(node, "RAMDisk", sizeof(RAMDiskParam), (void*)&ramdiskPtr);␉␉␊ |
106 | ␉␉␉␉}␊ |
107 | ␉␉␉␉else␊ |
108 | ␉␉␉␉{␊ |
109 | ␉␉␉␉␉verbose("Unable to notify Mac OS X of the ramdisk %s.\n", filename);␊ |
110 | ␉␉␉␉}␊ |
111 | ␉␉␉}␊ |
112 | ␉␉␉else␊ |
113 | ␉␉␉{␊ |
114 | ␉␉␉␉verbose("Unable to read md0 image %s.\n", filename);␊ |
115 | ␉␉␉}␉␉␉␊ |
116 | ␉␉}␊ |
117 | ␉␉else␊ |
118 | ␉␉{␊ |
119 | ␉␉␉verbose("md0 image %s is empty.\n", filename);␊ |
120 | ␉␉}␊ |
121 | ␊ |
122 | ␉␉close(fh);␊ |
123 | ␊ |
124 | ␉}␊ |
125 | }␊ |
126 | ␊ |
127 | void umountRAMDisk(void)␊ |
128 | {␊ |
129 | ␉if (gRAMDiskMI != NULL)␊ |
130 | ␉{␊ |
131 | ␉␉// Release ramdisk BVRef and DiskBVMap.␊ |
132 | ␉␉struct DiskBVMap *oldMap = diskResetBootVolumes(0x100);␊ |
133 | ␉␉CacheReset();␊ |
134 | ␉␉diskFreeMap(oldMap);␊ |
135 | ␊ |
136 | ␉␉// Free multiboot info and module structures.␊ |
137 | ␉␉if ((void *)gRAMDiskMI->mi_mods_addr != NULL) free((void *)gRAMDiskMI->mi_mods_addr);␊ |
138 | ␉␉if (gRAMDiskMI != NULL) free(gRAMDiskMI);␊ |
139 | ␊ |
140 | ␉␉// Reset multiboot structures.␊ |
141 | ␉␉gRAMDiskMI = NULL;␊ |
142 | ␉␉␊ |
143 | ␉␉*gRAMDiskFile = '\0';␊ |
144 | ␊ |
145 | ␉␉// Release ramdisk driver hooks.␊ |
146 | ␉␉p_get_ramdisk_info = NULL;␊ |
147 | ␉␉p_ramdiskReadBytes = NULL;␊ |
148 | ␉␉LoadExtraDrivers_p = NULL;␊ |
149 | ␊ |
150 | ␉␉// Reset ramdisk bvr␊ |
151 | ␉␉gRAMDiskVolume = NULL;␊ |
152 | ␉␉printf("\nunmounting: done");␊ |
153 | ␉}␊ |
154 | }␊ |
155 | ␊ |
156 | int mountRAMDisk(const char * param)␊ |
157 | {␊ |
158 | ␉int fh = 0, ramDiskSize;␊ |
159 | ␉int error = 0;␊ |
160 | ␊ |
161 | ␉// Get file handle for ramdisk file.␊ |
162 | ␉fh = open(param);␊ |
163 | ␉if (fh != -1)␊ |
164 | ␉{␊ |
165 | ␉␉printf("\nreading ramdisk image: %s\n", param);␊ |
166 | ␊ |
167 | ␉␉ramDiskSize = file_size(fh);␊ |
168 | ␉␉if (ramDiskSize > 0)␊ |
169 | ␉␉{␊ |
170 | ␉␉␉// Unmount previously mounted image if exists.␊ |
171 | ␉␉␉umountRAMDisk();␊ |
172 | ␊ |
173 | ␉␉␉// Read new ramdisk image contents into PREBOOT_DATA area.␊ |
174 | ␉␉␉if (read(fh, (char *)PREBOOT_DATA, ramDiskSize) != ramDiskSize) error = -1;␊ |
175 | ␉␉}␊ |
176 | ␉␉else error = -1;␊ |
177 | ␊ |
178 | ␉␉close(fh);␊ |
179 | ␉}␊ |
180 | ␉else error = -1;␊ |
181 | ␊ |
182 | ␉if (error == 0)␊ |
183 | ␉{␊ |
184 | ␉␉// Save filename in gRAMDiskFile to display information.␊ |
185 | ␉␉strlcpy(gRAMDiskFile, param, sizeof(gRAMDiskFile));␊ |
186 | ␊ |
187 | ␉␉// Set gRAMDiskMI as well for the multiboot ramdisk driver hook.␊ |
188 | ␉␉gRAMDiskMI = malloc(sizeof(multiboot_info));␊ |
189 | ␉␉␊ |
190 | ␉␉struct multiboot_module * ramdisk_module = malloc(sizeof(multiboot_module));␊ |
191 | ␊ |
192 | ␉␉// Fill in multiboot info and module structures.␊ |
193 | ␉␉if (gRAMDiskMI != NULL && ramdisk_module != NULL)␊ |
194 | ␉␉{␊ |
195 | ␉␉␉gRAMDiskMI->mi_mods_count = 1;␊ |
196 | ␉␉␉gRAMDiskMI->mi_mods_addr = (uint32_t)ramdisk_module;␊ |
197 | ␉␉␉ramdisk_module->mm_mod_start = PREBOOT_DATA;␊ |
198 | ␉␉␉ramdisk_module->mm_mod_end = PREBOOT_DATA + ramDiskSize;␊ |
199 | ␊ |
200 | ␉␉␉// Set ramdisk driver hooks.␊ |
201 | ␉␉␉p_get_ramdisk_info = &multiboot_get_ramdisk_info;␊ |
202 | ␉␉␉p_ramdiskReadBytes = &multibootRamdiskReadBytes;␊ |
203 | ␉␉␉LoadExtraDrivers_p = &multiboot_LoadExtraDrivers;␊ |
204 | ␊ |
205 | ␉␉␉int partCount; // unused␊ |
206 | ␉␉␉// Save bvr of the mounted image.␊ |
207 | ␉␉␉gRAMDiskVolume = diskScanBootVolumes(0x100, &partCount);␊ |
208 | ␉␉␉if(gRAMDiskVolume == NULL)␊ |
209 | ␉␉␉{␊ |
210 | ␉␉␉␉umountRAMDisk();␊ |
211 | ␉␉␉␉printf("\nRamdisk contains no partitions.\n");␊ |
212 | ␉␉␉␉pause();␊ |
213 | ␊ |
214 | // error = -1; // ??␊ |
215 | ␊ |
216 | ␉␉␉}␊ |
217 | ␉␉␉else␊ |
218 | ␉␉␉{␊ |
219 | ␉␉␉␉char dirSpec[128];␊ |
220 | ␊ |
221 | ␉␉␉␉// Reading ramdisk configuration.␊ |
222 | ␉␉␉␉strlcpy(dirSpec, RAMDISKCONFIG_FILENAME, sizeof(dirSpec));␊ |
223 | ␊ |
224 | ␉␉␉␉if (loadConfigFile(dirSpec, &ramdiskConfig) == 0)␊ |
225 | ␉␉␉␉{␊ |
226 | ␉␉␉␉␉getBoolForKey("BTAlias", &gRAMDiskBTAliased, &ramdiskConfig);␊ |
227 | ␉␉␉␉}␊ |
228 | ␉␉␉␉else␊ |
229 | ␉␉␉␉{␊ |
230 | ␉␉␉␉␉verbose("\nno ramdisk config...\n");␊ |
231 | ␉␉␉␉}␊ |
232 | ␊ |
233 | ␉␉␉␉printf("\nmounting: done");␊ |
234 | ␉␉␉}␊ |
235 | ␉␉}␊ |
236 | else error = -1;␊ |
237 | ␊ |
238 | if (error == -1) {␊ |
239 | if (ramdisk_module)␊ |
240 | free(ramdisk_module);␊ |
241 | else if (gRAMDiskMI)␊ |
242 | free(gRAMDiskMI);␊ |
243 | } ␊ |
244 | ␉} ␊ |
245 | ␊ |
246 | ␉return error;␊ |
247 | }␊ |
248 | ␊ |
249 | void setRAMDiskBTHook(bool mode)␊ |
250 | {␊ |
251 | ␉gRAMDiskBTAliased = mode;␊ |
252 | ␉if (mode)␊ |
253 | ␉{␊ |
254 | ␉␉printf("\nEnabled bt(0,0) alias.");␊ |
255 | ␉}␊ |
256 | ␉else␊ |
257 | ␉{␊ |
258 | ␉␉printf("\nDisabled bt(0,0) alias.");␊ |
259 | ␉}␊ |
260 | }␊ |
261 | ␊ |
262 | void showInfoRAMDisk(void)␊ |
263 | {␊ |
264 | ␉int len;␊ |
265 | ␉const char *val;␊ |
266 | ␊ |
267 | ␉if (gRAMDiskMI != NULL)␊ |
268 | ␉{␊ |
269 | ␉␉struct multiboot_module * ramdisk_module = (void *)gRAMDiskMI->mi_mods_addr;␊ |
270 | ␊ |
271 | ␉␉printf("\nfile: %s %d", gRAMDiskFile,␊ |
272 | ␉␉ramdisk_module->mm_mod_end - ramdisk_module->mm_mod_start);␊ |
273 | ␉␉printf("\nalias: %s", gRAMDiskBTAliased ? "enabled" : "disabled");␊ |
274 | ␊ |
275 | ␉␉// Display ramdisk information if available.␊ |
276 | ␉␉if (getValueForKey("Info", &val, &len, &ramdiskConfig))␊ |
277 | ␉␉{␊ |
278 | ␉␉␉printf("\ninfo: %s", val);␊ |
279 | ␉␉}␊ |
280 | ␉␉else␊ |
281 | ␉␉{␊ |
282 | ␉␉␉printf("\nramdisk info not available.");␊ |
283 | ␉␉}␊ |
284 | ␉}␊ |
285 | ␉else␊ |
286 | ␉{␊ |
287 | ␉␉printf("\nNo ramdisk mounted.");␊ |
288 | ␉}␊ |
289 | }␊ |
290 | ␊ |
291 | int loadPrebootRAMDisk(void)␊ |
292 | {␊ |
293 | ␉mountRAMDisk("bt(0,0)/Extra/Preboot.dmg");␊ |
294 | ␉if (gRAMDiskMI != NULL)␊ |
295 | ␉{␊ |
296 | ␉␉printf("\n");␊ |
297 | ␉␉return 0;␊ |
298 | ␉}␊ |
299 | ␉else␊ |
300 | ␉{␊ |
301 | ␉␉return -1;␊ |
302 | ␉}␊ |
303 | }␊ |
304 | ␊ |
305 | void processRAMDiskCommand(char ** argPtr, const char * cmd)␊ |
306 | {␊ |
307 | ␉char * ptr = *argPtr;␊ |
308 | ␉char param[1024];␊ |
309 | ␉getNextArg(&ptr, param);␊ |
310 | ␊ |
311 | ␉if (strcmp(cmd, "m") == 0)␊ |
312 | ␉{␊ |
313 | ␉␉mountRAMDisk(param);␊ |
314 | ␉␉sleep(2);␊ |
315 | ␉}␊ |
316 | ␉else if (strcmp(cmd, "u") == 0)␊ |
317 | ␉{␊ |
318 | ␉␉umountRAMDisk();␊ |
319 | ␉␉sleep(2);␊ |
320 | ␉}␊ |
321 | ␉else if (strcmp(cmd, "e") == 0)␊ |
322 | ␉{␊ |
323 | ␉␉setRAMDiskBTHook(true);␊ |
324 | ␉␉sleep(2);␊ |
325 | ␉}␊ |
326 | ␉else if (strcmp(cmd, "d") == 0)␊ |
327 | ␉{␊ |
328 | ␉␉setRAMDiskBTHook(false);␊ |
329 | ␉␉sleep(2);␊ |
330 | ␉}␊ |
331 | ␉else if (strcmp(cmd, "i") == 0)␊ |
332 | ␉{␊ |
333 | ␉␉setActiveDisplayPage(1);␊ |
334 | ␉␉clearScreenRows(0, 24);␊ |
335 | ␉␉setCursorPosition(0, 0, 1);␊ |
336 | ␉␉showInfoRAMDisk();␊ |
337 | ␉␉printf("\n\nPress any key to continue.\n");␊ |
338 | ␉␉getc();␊ |
339 | ␉␉setActiveDisplayPage(0);␊ |
340 | ␉}␊ |
341 | ␉else␊ |
342 | ␉{␊ |
343 | ␉␉setActiveDisplayPage(1);␊ |
344 | ␉␉clearScreenRows(0, 24);␊ |
345 | ␉␉setCursorPosition(0, 0, 1);␊ |
346 | ␉␉printf("\nusage:\n");␊ |
347 | ␉␉printf("\n?rd i - display ramdisk information");␊ |
348 | ␉␉printf("\n?rd m <filename> - mount ramdisk image\n?rd u - unmount ramdisk image");␊ |
349 | ␉␉printf("\n?rd e - enable bt(0,0) alias\n?rd d - disable bt(0,0) alias");␊ |
350 | ␉␉printf("\n\nPress any key to continue.\n");␊ |
351 | ␉␉getc();␊ |
352 | ␉␉setActiveDisplayPage(0);␊ |
353 | ␉}␊ |
354 | }␊ |
355 | ␊ |
356 | ///////////////////////////////////////////////////////////////////////////␊ |
357 | // Ramdisk multiboot support␊ |
358 | ␊ |
359 | int multibootRamdiskReadBytes( int biosdev, unsigned int blkno,␊ |
360 | ␉␉␉␉␉␉␉ unsigned int byteoff,␊ |
361 | ␉␉␉␉␉␉␉ unsigned int byteCount, void * buffer )␊ |
362 | {␊ |
363 | int module_count = gRAMDiskMI->mi_mods_count;␊ |
364 | struct multiboot_module *modules = (void*)gRAMDiskMI->mi_mods_addr;␊ |
365 | if(biosdev < 0x100)␊ |
366 | return -1;␊ |
367 | if(biosdev >= (0x100 + module_count))␊ |
368 | return -1;␊ |
369 | struct multiboot_module *module = modules + (biosdev - 0x100);␊ |
370 | ␉␊ |
371 | void *p_initrd = (void*)module->mm_mod_start;␊ |
372 | bcopy(p_initrd + blkno*512 + byteoff, buffer, byteCount);␊ |
373 | return 0;␊ |
374 | }␊ |
375 | ␊ |
376 | int multiboot_get_ramdisk_info(int biosdev, struct driveInfo *dip)␊ |
377 | {␊ |
378 | int module_count = gRAMDiskMI->mi_mods_count;␊ |
379 | struct multiboot_module *modules = (void*)gRAMDiskMI->mi_mods_addr;␊ |
380 | if(biosdev < 0x100)␊ |
381 | return -1;␊ |
382 | if(biosdev >= (0x100 + module_count))␊ |
383 | return -1;␊ |
384 | struct multiboot_module *module = modules + (biosdev - 0x100);␊ |
385 | dip->biosdev = biosdev;␊ |
386 | dip->uses_ebios = true;␉// XXX aserebln uses_ebios isn't a boolean at all␊ |
387 | dip->di.params.phys_sectors = (module->mm_mod_end - module->mm_mod_start + 511) / 512;␊ |
388 | dip->valid = true;␊ |
389 | return 0;␊ |
390 | }␊ |
391 | ␊ |
392 | static long multiboot_LoadExtraDrivers(FileLoadDrivers_t FileLoadDrivers_p)␊ |
393 | {␊ |
394 | char extensionsSpec[1024];␊ |
395 | int ramdiskUnit;␊ |
396 | long ret, flags, cachetime;␊ |
397 | ␉␊ |
398 | for(ramdiskUnit = 0; ramdiskUnit < gRAMDiskMI->mi_mods_count; ++ramdiskUnit)␊ |
399 | {␊ |
400 | int partCount; // unused␊ |
401 | BVRef ramdiskChain = diskScanBootVolumes(0x100 + ramdiskUnit, &partCount);␊ |
402 | if(ramdiskChain == NULL)␊ |
403 | {␊ |
404 | verbose("Ramdisk contains no partitions\n");␊ |
405 | continue;␊ |
406 | }␊ |
407 | for(; ramdiskChain != NULL; ramdiskChain = ramdiskChain->next)␊ |
408 | {␊ |
409 | snprintf(extensionsSpec, sizeof(extensionsSpec) ,"rd(%d,%d)/Extra/", ramdiskUnit, ramdiskChain->part_no);␊ |
410 | ␊ |
411 | ret = GetFileInfo(NULL, extensionsSpec, &flags, &cachetime);␊ |
412 | ␊ |
413 | if (!ret) continue;␊ |
414 | ␊ |
415 | if (((flags & kFileTypeMask) != kFileTypeDirectory)) continue;␊ |
416 | ␊ |
417 | ret = FileLoadDrivers_p(extensionsSpec, sizeof(extensionsSpec), 0 /* this is a kext root dir, not a kext with plugins */);␊ |
418 | if(ret != 0)␊ |
419 | {␊ |
420 | verbose("FileLoadDrivers failed on a ramdisk\n");␊ |
421 | return ret;␊ |
422 | }␊ |
423 | }␊ |
424 | }␊ |
425 | return 0;␊ |
426 | }␊ |
427 | |