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 | if (oldMap == NULL)␊ |
134 | {␊ |
135 | return;␊ |
136 | }␊ |
137 | ␉␉CacheReset();␊ |
138 | ␉␉diskFreeMap(oldMap);␊ |
139 | ␊ |
140 | ␉␉// Free multiboot info and module structures.␊ |
141 | ␉␉if ((void *)gRAMDiskMI->mi_mods_addr != NULL) free((void *)gRAMDiskMI->mi_mods_addr);␊ |
142 | ␉␉if (gRAMDiskMI != NULL) free(gRAMDiskMI);␊ |
143 | ␊ |
144 | ␉␉// Reset multiboot structures.␊ |
145 | ␉␉gRAMDiskMI = NULL;␊ |
146 | ␉␉␊ |
147 | ␉␉*gRAMDiskFile = '\0';␊ |
148 | ␊ |
149 | ␉␉// Release ramdisk driver hooks.␊ |
150 | ␉␉p_get_ramdisk_info = NULL;␊ |
151 | ␉␉p_ramdiskReadBytes = NULL;␊ |
152 | ␉␉LoadExtraDrivers_p = NULL;␊ |
153 | ␊ |
154 | ␉␉// Reset ramdisk bvr␊ |
155 | ␉␉gRAMDiskVolume = NULL;␊ |
156 | ␉␉printf("\nunmounting: done");␊ |
157 | ␉}␊ |
158 | }␊ |
159 | ␊ |
160 | int mountRAMDisk(const char * param)␊ |
161 | {␊ |
162 | ␉int fh = 0, ramDiskSize;␊ |
163 | ␉int error = 0;␊ |
164 | ␊ |
165 | ␉// Get file handle for ramdisk file.␊ |
166 | ␉fh = open(param);␊ |
167 | ␉if (fh != -1)␊ |
168 | ␉{␊ |
169 | ␉␉printf("\nreading ramdisk image: %s\n", param);␊ |
170 | ␊ |
171 | ␉␉ramDiskSize = file_size(fh);␊ |
172 | ␉␉if (ramDiskSize > 0)␊ |
173 | ␉␉{␊ |
174 | ␉␉␉// Unmount previously mounted image if exists.␊ |
175 | ␉␉␉umountRAMDisk();␊ |
176 | ␊ |
177 | ␉␉␉// Read new ramdisk image contents into PREBOOT_DATA area.␊ |
178 | ␉␉␉if (read(fh, (char *)PREBOOT_DATA, ramDiskSize) != ramDiskSize) error = -1;␊ |
179 | ␉␉}␊ |
180 | ␉␉else error = -1;␊ |
181 | ␊ |
182 | ␉␉close(fh);␊ |
183 | ␉}␊ |
184 | ␉else error = -1;␊ |
185 | ␊ |
186 | ␉if (error == 0)␊ |
187 | ␉{␊ |
188 | ␉␉// Save filename in gRAMDiskFile to display information.␊ |
189 | ␉␉strlcpy(gRAMDiskFile, param, sizeof(gRAMDiskFile));␊ |
190 | ␊ |
191 | ␉␉// Set gRAMDiskMI as well for the multiboot ramdisk driver hook.␊ |
192 | ␉␉gRAMDiskMI = malloc(sizeof(multiboot_info));␊ |
193 | ␉␉␊ |
194 | ␉␉struct multiboot_module * ramdisk_module = malloc(sizeof(multiboot_module));␊ |
195 | ␊ |
196 | ␉␉// Fill in multiboot info and module structures.␊ |
197 | ␉␉if (gRAMDiskMI != NULL && ramdisk_module != NULL)␊ |
198 | ␉␉{␊ |
199 | ␉␉␉gRAMDiskMI->mi_mods_count = 1;␊ |
200 | ␉␉␉gRAMDiskMI->mi_mods_addr = (uint32_t)ramdisk_module;␊ |
201 | ␉␉␉ramdisk_module->mm_mod_start = PREBOOT_DATA;␊ |
202 | ␉␉␉ramdisk_module->mm_mod_end = PREBOOT_DATA + ramDiskSize;␊ |
203 | ␊ |
204 | ␉␉␉// Set ramdisk driver hooks.␊ |
205 | ␉␉␉p_get_ramdisk_info = &multiboot_get_ramdisk_info;␊ |
206 | ␉␉␉p_ramdiskReadBytes = &multibootRamdiskReadBytes;␊ |
207 | ␉␉␉LoadExtraDrivers_p = &multiboot_LoadExtraDrivers;␊ |
208 | ␊ |
209 | ␉␉␉int partCount; // unused␊ |
210 | ␉␉␉// Save bvr of the mounted image.␊ |
211 | ␉␉␉gRAMDiskVolume = diskScanBootVolumes(0x100, &partCount);␊ |
212 | ␉␉␉if(gRAMDiskVolume == NULL)␊ |
213 | ␉␉␉{␊ |
214 | ␉␉␉␉umountRAMDisk();␊ |
215 | ␉␉␉␉printf("\nRamdisk contains no partitions.\n");␊ |
216 | ␉␉␉␉pause();␊ |
217 | ␊ |
218 | // error = -1; // ??␊ |
219 | ␊ |
220 | ␉␉␉}␊ |
221 | ␉␉␉else␊ |
222 | ␉␉␉{␊ |
223 | ␉␉␉␉char dirSpec[128];␊ |
224 | ␊ |
225 | ␉␉␉␉// Reading ramdisk configuration.␊ |
226 | ␉␉␉␉strlcpy(dirSpec, RAMDISKCONFIG_FILENAME, sizeof(dirSpec));␊ |
227 | ␊ |
228 | ␉␉␉␉if (loadConfigFile(dirSpec, &ramdiskConfig) == 0)␊ |
229 | ␉␉␉␉{␊ |
230 | ␉␉␉␉␉getBoolForKey("BTAlias", &gRAMDiskBTAliased, &ramdiskConfig);␊ |
231 | ␉␉␉␉}␊ |
232 | ␉␉␉␉else␊ |
233 | ␉␉␉␉{␊ |
234 | ␉␉␉␉␉verbose("\nno ramdisk config...\n");␊ |
235 | ␉␉␉␉}␊ |
236 | ␊ |
237 | ␉␉␉␉printf("\nmounting: done");␊ |
238 | ␉␉␉}␊ |
239 | ␉␉}␊ |
240 | else error = -1;␊ |
241 | ␊ |
242 | if (error == -1) {␊ |
243 | if (ramdisk_module)␊ |
244 | free(ramdisk_module);␊ |
245 | else if (gRAMDiskMI)␊ |
246 | free(gRAMDiskMI);␊ |
247 | } ␊ |
248 | ␉} ␊ |
249 | ␊ |
250 | ␉return error;␊ |
251 | }␊ |
252 | ␊ |
253 | void setRAMDiskBTHook(bool mode)␊ |
254 | {␊ |
255 | ␉gRAMDiskBTAliased = mode;␊ |
256 | ␉if (mode)␊ |
257 | ␉{␊ |
258 | ␉␉printf("\nEnabled bt(0,0) alias.");␊ |
259 | ␉}␊ |
260 | ␉else␊ |
261 | ␉{␊ |
262 | ␉␉printf("\nDisabled bt(0,0) alias.");␊ |
263 | ␉}␊ |
264 | }␊ |
265 | ␊ |
266 | void showInfoRAMDisk(void)␊ |
267 | {␊ |
268 | ␉int len;␊ |
269 | ␉const char *val;␊ |
270 | ␊ |
271 | ␉if (gRAMDiskMI != NULL)␊ |
272 | ␉{␊ |
273 | ␉␉struct multiboot_module * ramdisk_module = (void *)gRAMDiskMI->mi_mods_addr;␊ |
274 | ␊ |
275 | ␉␉printf("\nfile: %s %d", gRAMDiskFile,␊ |
276 | ␉␉ramdisk_module->mm_mod_end - ramdisk_module->mm_mod_start);␊ |
277 | ␉␉printf("\nalias: %s", gRAMDiskBTAliased ? "enabled" : "disabled");␊ |
278 | ␊ |
279 | ␉␉// Display ramdisk information if available.␊ |
280 | ␉␉if (getValueForKey("Info", &val, &len, &ramdiskConfig))␊ |
281 | ␉␉{␊ |
282 | ␉␉␉printf("\ninfo: %s", val);␊ |
283 | ␉␉}␊ |
284 | ␉␉else␊ |
285 | ␉␉{␊ |
286 | ␉␉␉printf("\nramdisk info not available.");␊ |
287 | ␉␉}␊ |
288 | ␉}␊ |
289 | ␉else␊ |
290 | ␉{␊ |
291 | ␉␉printf("\nNo ramdisk mounted.");␊ |
292 | ␉}␊ |
293 | }␊ |
294 | ␊ |
295 | int loadPrebootRAMDisk(void)␊ |
296 | {␊ |
297 | ␉mountRAMDisk("bt(0,0)/Extra/Preboot.dmg");␊ |
298 | ␉if (gRAMDiskMI != NULL)␊ |
299 | ␉{␊ |
300 | ␉␉printf("\n");␊ |
301 | ␉␉return 0;␊ |
302 | ␉}␊ |
303 | ␉else␊ |
304 | ␉{␊ |
305 | ␉␉return -1;␊ |
306 | ␉}␊ |
307 | }␊ |
308 | ␊ |
309 | void processRAMDiskCommand(char ** argPtr, const char * cmd)␊ |
310 | {␊ |
311 | ␉char * ptr = *argPtr;␊ |
312 | ␉char param[1024];␊ |
313 | ␉getNextArg(&ptr, param);␊ |
314 | ␊ |
315 | ␉if (strncmp(cmd, "m",sizeof("m")) == 0)␊ |
316 | ␉{␊ |
317 | ␉␉mountRAMDisk(param);␊ |
318 | ␉␉sleep(2);␊ |
319 | ␉}␊ |
320 | ␉else if (strncmp(cmd, "u", sizeof("u")) == 0)␊ |
321 | ␉{␊ |
322 | ␉␉umountRAMDisk();␊ |
323 | ␉␉sleep(2);␊ |
324 | ␉}␊ |
325 | ␉else if (strncmp(cmd, "e", sizeof("e")) == 0)␊ |
326 | ␉{␊ |
327 | ␉␉setRAMDiskBTHook(true);␊ |
328 | ␉␉sleep(2);␊ |
329 | ␉}␊ |
330 | ␉else if (strncmp(cmd, "d", sizeof("d")) == 0)␊ |
331 | ␉{␊ |
332 | ␉␉setRAMDiskBTHook(false);␊ |
333 | ␉␉sleep(2);␊ |
334 | ␉}␊ |
335 | ␉else if (strncmp(cmd, "i", sizeof("i")) == 0)␊ |
336 | ␉{␊ |
337 | ␉␉setActiveDisplayPage(1);␊ |
338 | ␉␉clearScreenRows(0, 24);␊ |
339 | ␉␉setCursorPosition(0, 0, 1);␊ |
340 | ␉␉showInfoRAMDisk();␊ |
341 | ␉␉printf("\n\nPress any key to continue.\n");␊ |
342 | ␉␉getc();␊ |
343 | ␉␉setActiveDisplayPage(0);␊ |
344 | ␉}␊ |
345 | ␉else␊ |
346 | ␉{␊ |
347 | ␉␉setActiveDisplayPage(1);␊ |
348 | ␉␉clearScreenRows(0, 24);␊ |
349 | ␉␉setCursorPosition(0, 0, 1);␊ |
350 | ␉␉printf("\nusage:\n");␊ |
351 | ␉␉printf("\n?rd i - display ramdisk information");␊ |
352 | ␉␉printf("\n?rd m <filename> - mount ramdisk image\n?rd u - unmount ramdisk image");␊ |
353 | ␉␉printf("\n?rd e - enable bt(0,0) alias\n?rd d - disable bt(0,0) alias");␊ |
354 | ␉␉printf("\n\nPress any key to continue.\n");␊ |
355 | ␉␉getc();␊ |
356 | ␉␉setActiveDisplayPage(0);␊ |
357 | ␉}␊ |
358 | }␊ |
359 | ␊ |
360 | ///////////////////////////////////////////////////////////////////////////␊ |
361 | // Ramdisk multiboot support␊ |
362 | ␊ |
363 | int multibootRamdiskReadBytes( int biosdev, unsigned int blkno,␊ |
364 | ␉␉␉␉␉␉␉ unsigned int byteoff,␊ |
365 | ␉␉␉␉␉␉␉ unsigned int byteCount, void * buffer )␊ |
366 | {␊ |
367 | int module_count = gRAMDiskMI->mi_mods_count;␊ |
368 | struct multiboot_module *modules = (void*)gRAMDiskMI->mi_mods_addr;␊ |
369 | if(biosdev < 0x100)␊ |
370 | return -1;␊ |
371 | if(biosdev >= (0x100 + module_count))␊ |
372 | return -1;␊ |
373 | struct multiboot_module *module = modules + (biosdev - 0x100);␊ |
374 | ␉␊ |
375 | void *p_initrd = (void*)module->mm_mod_start;␊ |
376 | bcopy(p_initrd + blkno*512 + byteoff, buffer, byteCount);␊ |
377 | return 0;␊ |
378 | }␊ |
379 | ␊ |
380 | int multiboot_get_ramdisk_info(int biosdev, struct driveInfo *dip)␊ |
381 | {␊ |
382 | int module_count = gRAMDiskMI->mi_mods_count;␊ |
383 | struct multiboot_module *modules = (void*)gRAMDiskMI->mi_mods_addr;␊ |
384 | if(biosdev < 0x100)␊ |
385 | return -1;␊ |
386 | if(biosdev >= (0x100 + module_count))␊ |
387 | return -1;␊ |
388 | struct multiboot_module *module = modules + (biosdev - 0x100);␊ |
389 | dip->biosdev = biosdev;␊ |
390 | dip->uses_ebios = true;␉// XXX aserebln uses_ebios isn't a boolean at all␊ |
391 | dip->di.params.phys_sectors = (module->mm_mod_end - module->mm_mod_start + 511) / 512;␊ |
392 | dip->valid = true;␊ |
393 | return 0;␊ |
394 | }␊ |
395 | ␊ |
396 | static long multiboot_LoadExtraDrivers(FileLoadDrivers_t FileLoadDrivers_p)␊ |
397 | {␊ |
398 | char extensionsSpec[1024];␊ |
399 | int ramdiskUnit;␊ |
400 | long ret, flags, cachetime;␊ |
401 | ␉␊ |
402 | for(ramdiskUnit = 0; ramdiskUnit < gRAMDiskMI->mi_mods_count; ++ramdiskUnit)␊ |
403 | {␊ |
404 | int partCount; // unused␊ |
405 | BVRef ramdiskChain = diskScanBootVolumes(0x100 + ramdiskUnit, &partCount);␊ |
406 | if(ramdiskChain == NULL)␊ |
407 | {␊ |
408 | verbose("Ramdisk contains no partitions\n");␊ |
409 | continue;␊ |
410 | }␊ |
411 | for(; ramdiskChain != NULL; ramdiskChain = ramdiskChain->next)␊ |
412 | {␊ |
413 | snprintf(extensionsSpec, sizeof(extensionsSpec) ,"rd(%d,%d)/Extra/", ramdiskUnit, ramdiskChain->part_no);␊ |
414 | ␊ |
415 | ret = GetFileInfo(NULL, extensionsSpec, &flags, &cachetime);␊ |
416 | ␊ |
417 | if (!ret) continue;␊ |
418 | ␊ |
419 | if (((flags & kFileTypeMask) != kFileTypeDirectory)) continue;␊ |
420 | ␊ |
421 | ret = FileLoadDrivers_p(extensionsSpec, sizeof(extensionsSpec), 0 /* this is a kext root dir, not a kext with plugins */);␊ |
422 | if(ret != 0)␊ |
423 | {␊ |
424 | verbose("FileLoadDrivers failed on a ramdisk\n");␊ |
425 | return ret;␊ |
426 | }␊ |
427 | }␊ |
428 | }␊ |
429 | return 0;␊ |
430 | }␊ |
431 | |