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Source at commit 482 created 13 years 8 months ago. By meklort, Modified macho parser to handle 64bit files properly (untested). Modified module hooks to be a sorted linked list for now, I may convert to a faster search later on. I should now be able to add 64bit support to the kernel patcher. | |
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1 | /*␊ |
2 | File added by David F. Elliott <dfe@cox.net> on 2007/06/26␊ |
3 | */␊ |
4 | ␊ |
5 | #include "libsaio.h"␊ |
6 | #include "boot.h"␊ |
7 | #include "bootstruct.h"␊ |
8 | ␊ |
9 | #include "mboot.h"␊ |
10 | ␊ |
11 | int multiboot_timeout=0;␊ |
12 | int multiboot_timeout_set=0;␊ |
13 | int multiboot_partition=0;␊ |
14 | int multiboot_partition_set=0;␊ |
15 | ␊ |
16 | // Global multiboot info, if using multiboot.␊ |
17 | struct multiboot_info *gMI;␊ |
18 | ␊ |
19 | extern void continue_at_low_address(void);␊ |
20 | ␊ |
21 | // prototype hi_multiboot and keep its implementation below multiboot_to_boot␊ |
22 | // to ensure that it doesn't get inlined by the compiler␊ |
23 | // We don't want it inlined because we specifically want the stack frame␊ |
24 | // pointer to be as high as possible and the hi_multiboot function␊ |
25 | // copies multiboot_info onto its stack.␊ |
26 | uint32_t hi_multiboot(int multiboot_magic, struct multiboot_info *mi_orig);␊ |
27 | // prototype dochainload for the same reason.␊ |
28 | void dochainload();␊ |
29 | ␊ |
30 | #define OFFSET_1MEG 0x100000␊ |
31 | #define BAD_BOOT_DEVICE 0xffffffff␊ |
32 | ␊ |
33 | // This assumes that the address of the first argument to the function will␊ |
34 | // be exactly 4 bytes above the address of the return address.␊ |
35 | // It is intended to be used as an lvalue with a statement like this -= OFFSET_1MEG;␊ |
36 | #define RETURN_ADDRESS_USING_FIRST_ARG(arg) \␊ |
37 | (*(uint32_t*)((char*)&(arg) - 4))␊ |
38 | ␊ |
39 | #define FIX_RETURN_ADDRESS_USING_FIRST_ARG(arg) \␊ |
40 | RETURN_ADDRESS_USING_FIRST_ARG(arg) -= OFFSET_1MEG␊ |
41 | ␊ |
42 | extern void jump_to_chainbooter();␊ |
43 | extern unsigned char chainbootdev;␊ |
44 | extern unsigned char chainbootflag;␊ |
45 | ␊ |
46 | void chainLoad();␊ |
47 | void waitThenReload();␊ |
48 | ␊ |
49 | int multibootRamdiskReadBytes( int biosdev, unsigned int blkno,␊ |
50 | unsigned int byteoff,␊ |
51 | unsigned int byteCount, void * buffer );␊ |
52 | int multiboot_get_ramdisk_info(int biosdev, struct driveInfo *dip);␊ |
53 | static long multiboot_LoadExtraDrivers(FileLoadDrivers_t FileLoadDrivers_p);␊ |
54 | ␊ |
55 | // Starts off in the multiboot context 1 MB high but eventually gets into low memory␊ |
56 | // and winds up with a bootdevice in eax which is all that boot() wants␊ |
57 | // This lets the stack pointer remain very high.␊ |
58 | // If we were to call boot directly from multiboot then the whole multiboot_info␊ |
59 | // would be on the stack which would possibly be using way too much stack.␊ |
60 | void multiboot_to_boot(int multiboot_magic, struct multiboot_info *mi_orig)␊ |
61 | {␊ |
62 | uint32_t bootdevice = hi_multiboot(multiboot_magic, mi_orig);␊ |
63 | if(bootdevice != BAD_BOOT_DEVICE)␊ |
64 | {␊ |
65 | // boot only returns to do a chain load.␊ |
66 | for(;;)␊ |
67 | { // NOTE: boot only uses the last byte (the drive number)␊ |
68 | common_boot(bootdevice);␊ |
69 | if(chainbootflag)␊ |
70 | chainLoad();␊ |
71 | else␊ |
72 | waitThenReload();␊ |
73 | }␊ |
74 | }␊ |
75 | // Avoid returning to high-memory address which isn't valid in the segment␊ |
76 | // we are now in.␊ |
77 | // Calling sleep() ensures the user ought to be able to use Ctrl+Alt+Del␊ |
78 | // because the BIOS will have interrupts on.␊ |
79 | for(;;)␊ |
80 | sleep(10);␊ |
81 | // NOTE: *IF* we needed to return we'd have to fix up our return address to␊ |
82 | // be in low memory using the same trick as below.␊ |
83 | // However, there doesn't seem to be any point in returning to assembly␊ |
84 | // particularly when the remaining code merely halts the processor.␊ |
85 | }␊ |
86 | ␊ |
87 | void chainLoad()␊ |
88 | {␊ |
89 | /* TODO: We ought to load the appropriate partition table, for example␊ |
90 | the MBR if booting a primary partition or the particular extended␊ |
91 | partition table if booting a logical drive. For example, the␊ |
92 | regular MS MBR booter will relocate itself (e.g. the MBR) from␊ |
93 | 0:7C00 to 0:0600 and will use SI as the offset when reading␊ |
94 | the partition data from itself. Thus when it jumps to the partition␊ |
95 | boot sector, SI will be 0x600 + 446 + i<<4 where i is the partition␊ |
96 | table index.␊ |
97 | ␊ |
98 | On the other hand, our code for the non-Multiboot case doesn't do␊ |
99 | this either, although GRUB does.␊ |
100 | */␊ |
101 | ␊ |
102 | const unsigned char *bootcode = (const unsigned char*)0x7c00;␊ |
103 | if(bootcode[0x1fe] == 0x55 && bootcode[0x1ff] == 0xaa)␊ |
104 | {␊ |
105 | printf("Calling chainbooter\n");␊ |
106 | jump_to_chainbooter();␊ |
107 | /* NORETURN */␊ |
108 | }␊ |
109 | else␊ |
110 | {␊ |
111 | printf("Bad chain boot sector magic: %02x%02x\n", bootcode[0x1fe], bootcode[0x1ff]);␊ |
112 | }␊ |
113 | }␊ |
114 | ␊ |
115 | void waitThenReload()␊ |
116 | {␊ |
117 | /* FIXME: Ctrl+Alt+Del does not work under Boot Camp */␊ |
118 | printf("Darwin booter exited for some reason.\n");␊ |
119 | printf("Please reboot (Ctrl+Alt+Del) your machine.\n");␊ |
120 | printf("Restarting Darwin booter in 5 seconds...");␊ |
121 | sleep(1);␊ |
122 | printf("4...");␊ |
123 | sleep(1);␊ |
124 | printf("3...");␊ |
125 | sleep(1);␊ |
126 | printf("2...");␊ |
127 | sleep(1);␊ |
128 | printf("1...");␊ |
129 | sleep(1);␊ |
130 | printf("0\n");␊ |
131 | }␊ |
132 | ␊ |
133 | // Declare boot2_sym as an opaque struct so it can't be converted to a pointer␊ |
134 | // i.e. ensure the idiot programmer (me) makes sure to use address-of␊ |
135 | // Technically it's a function but it's real mode code and we sure don't␊ |
136 | // want to call it under any circumstances.␊ |
137 | extern struct {} boot2_sym asm("boot2");␊ |
138 | ␊ |
139 | // prototype multiboot and keep its implementation below hi_multiboot to␊ |
140 | // ensure that it doesn't get inlined by the compiler␊ |
141 | static inline uint32_t multiboot(int multiboot_magic, struct multiboot_info *mi);␊ |
142 | ␊ |
143 | ␊ |
144 | /*!␊ |
145 | Returns a pointer to the first safe address we can use for stowing the multiboot info.␊ |
146 | This might actually be a bit pedantic because mboot.c32 and GRUB both stow the multiboot␊ |
147 | info in low memory meaning that the >= 128 MB location we choose is plenty high enough.␊ |
148 | */␊ |
149 | void *determine_safe_hi_addr(int multiboot_magic, struct multiboot_info *mi_orig)␊ |
150 | {␊ |
151 | // hi_addr must be at least up in 128MB+ space so it doesn't get clobbered␊ |
152 | void *hi_addr = (void*)PREBOOT_DATA;␊ |
153 | ␊ |
154 | // Fail if the magic isn't correct. We'll complain later.␊ |
155 | if(multiboot_magic != MULTIBOOT_INFO_MAGIC)␊ |
156 | return NULL;␊ |
157 | // Make sure the command-line isn't in high memory.␊ |
158 | if(mi_orig->mi_flags & MULTIBOOT_INFO_HAS_CMDLINE)␊ |
159 | {␊ |
160 | char *end = mi_orig->mi_cmdline;␊ |
161 | if(end != NULL)␊ |
162 | {␊ |
163 | for(; *end != '\0'; ++end)␊ |
164 | ;␊ |
165 | ++end;␊ |
166 | if( (void*)end > hi_addr)␊ |
167 | hi_addr = end;␊ |
168 | }␊ |
169 | }␊ |
170 | // Make sure the module information isn't in high memory␊ |
171 | if(mi_orig->mi_flags & MULTIBOOT_INFO_HAS_MODS)␊ |
172 | {␊ |
173 | struct multiboot_module *modules = (void*)mi_orig->mi_mods_addr;␊ |
174 | int i;␊ |
175 | for(i=0; i < mi_orig->mi_mods_count; ++i)␊ |
176 | {␊ |
177 | // make sure the multiboot_module struct itself won't get clobbered␊ |
178 | void *modinfo_end = modules+i+1;␊ |
179 | if(modinfo_end > hi_addr)␊ |
180 | hi_addr = modinfo_end;␊ |
181 | // make sure the module itself won't get clobbered␊ |
182 | modinfo_end = (void*)modules[i].mm_mod_end;␊ |
183 | if(modinfo_end > hi_addr)␊ |
184 | hi_addr = modinfo_end;␊ |
185 | // make sure the module string doesn't get clobbered␊ |
186 | char *end = modules[i].mm_string;␊ |
187 | for(; *end != '\0'; ++end)␊ |
188 | ;␊ |
189 | ++end;␊ |
190 | modinfo_end = end;␊ |
191 | if(modinfo_end > hi_addr)␊ |
192 | hi_addr = modinfo_end;␊ |
193 | }␊ |
194 | }␊ |
195 | // TODO: Copy syms (never needed), mmap, drives, config table, loader name, apm table, VBE info␊ |
196 | ␊ |
197 | // Round up to page size␊ |
198 | hi_addr = (void*)(((uint32_t)hi_addr + 0xfff) & ~(uint32_t)0xfff);␊ |
199 | return hi_addr;␊ |
200 | }␊ |
201 | ␊ |
202 | /*!␊ |
203 | Like malloc but with a preceding input/output parameter which points to the next available␊ |
204 | location for data. The original value of *hi_addr is returned and *hi_addr is incremented␊ |
205 | by size bytes.␊ |
206 | */␊ |
207 | void * _hi_malloc(void **hi_addr, size_t size)␊ |
208 | {␊ |
209 | void *ret = *hi_addr;␊ |
210 | *hi_addr += size;␊ |
211 | return ret;␊ |
212 | }␊ |
213 | ␊ |
214 | /*!␊ |
215 | Like strdup but with a preceding input/output parameter. The original value of *hi_addr is␊ |
216 | returned and *hi_addr is incremented by the number of bytes necessary to complete the string␊ |
217 | copy including its NUL terminator.␊ |
218 | */␊ |
219 | char * _hi_strdup(void **hi_addr, char *src)␊ |
220 | {␊ |
221 | char *dstStart;␊ |
222 | char *dst = dstStart = *hi_addr;␊ |
223 | for(; *src != '\0'; ++src, ++dst, ++(*hi_addr))␊ |
224 | *dst = *src;␊ |
225 | *dst = '\0';␊ |
226 | ++(*hi_addr);␊ |
227 | return dstStart;␊ |
228 | }␊ |
229 | ␊ |
230 | // Convenience macros␊ |
231 | #define hi_malloc(size) _hi_malloc(&hi_addr, (size))␊ |
232 | #define hi_strdup(src) _hi_strdup(&hi_addr, (src))␊ |
233 | ␊ |
234 | /*!␊ |
235 | Copies the Multiboot info and any associated data (e.g. various strings and any multiboot modules)␊ |
236 | up to very high RAM (above 128 MB) to ensure it doesn't get clobbered by the booter.␊ |
237 | */␊ |
238 | struct multiboot_info * copyMultibootInfo(int multiboot_magic, struct multiboot_info *mi_orig)␊ |
239 | {␊ |
240 | void *hi_addr = determine_safe_hi_addr(multiboot_magic, mi_orig);␊ |
241 | if(hi_addr == NULL)␊ |
242 | return NULL;␊ |
243 | ␊ |
244 | struct multiboot_info *mi_copy = hi_malloc(sizeof(*mi_copy));␊ |
245 | memcpy(mi_copy, mi_orig, sizeof(*mi_copy));␊ |
246 | ␊ |
247 | // Copy the command line␊ |
248 | if(mi_orig->mi_flags & MULTIBOOT_INFO_HAS_CMDLINE)␊ |
249 | {␊ |
250 | mi_copy->mi_cmdline = hi_strdup(mi_orig->mi_cmdline);␊ |
251 | }␊ |
252 | // Copy the loader name␊ |
253 | if(mi_orig->mi_flags & MULTIBOOT_INFO_HAS_LOADER_NAME)␊ |
254 | {␊ |
255 | mi_copy->mi_loader_name = hi_strdup(mi_orig->mi_loader_name);␊ |
256 | }␊ |
257 | // Copy the module info␊ |
258 | if(mi_orig->mi_flags & MULTIBOOT_INFO_HAS_MODS)␊ |
259 | {␊ |
260 | struct multiboot_module *dst_modules = hi_malloc(sizeof(*dst_modules)*mi_orig->mi_mods_count);␊ |
261 | struct multiboot_module *src_modules = (void*)mi_orig->mi_mods_addr;␊ |
262 | mi_copy->mi_mods_addr = (uint32_t)dst_modules;␊ |
263 | ␊ |
264 | // Copy all of the module info plus the actual module into high memory␊ |
265 | int i;␊ |
266 | for(i=0; i < mi_orig->mi_mods_count; ++i)␊ |
267 | {␊ |
268 | // Assume mod_end is 1 past the actual end (i.e. it is start + size, not really end (i.e. start + size - 1))␊ |
269 | // This is what GRUB and mboot.c32 do although the spec is unclear on this.␊ |
270 | uint32_t mod_length = src_modules[i].mm_mod_end - src_modules[i].mm_mod_start;␊ |
271 | ␊ |
272 | dst_modules[i].mm_mod_start = (uint32_t)hi_malloc(mod_length);␊ |
273 | dst_modules[i].mm_mod_end = (uint32_t)dst_modules[i].mm_mod_start + mod_length;␊ |
274 | memcpy((char*)dst_modules[i].mm_mod_start, (char*)src_modules[i].mm_mod_start, mod_length);␊ |
275 | ␊ |
276 | dst_modules[i].mm_string = hi_strdup(src_modules[i].mm_string);␊ |
277 | dst_modules[i].mm_reserved = src_modules[i].mm_reserved;␊ |
278 | }␊ |
279 | }␊ |
280 | // Make sure that only stuff that didn't need to be copied or that we did deep copy is indicated in the copied struct.␊ |
281 | mi_copy->mi_flags &= MULTIBOOT_INFO_HAS_MEMORY | MULTIBOOT_INFO_HAS_BOOT_DEVICE | MULTIBOOT_INFO_HAS_CMDLINE | MULTIBOOT_INFO_HAS_LOADER_NAME | MULTIBOOT_INFO_HAS_MODS;␊ |
282 | ␊ |
283 | return mi_copy;␊ |
284 | }␊ |
285 | ␊ |
286 | // When we enter, we're actually 1 MB high.␊ |
287 | // Fortunately, memcpy is position independent, and it's all we need␊ |
288 | uint32_t hi_multiboot(int multiboot_magic, struct multiboot_info *mi_orig)␊ |
289 | {␊ |
290 | // Copy the multiboot info out of the way.␊ |
291 | // We can't bitch about the magic yet because printf won't work␊ |
292 | // because it contains an absolute location of putchar which␊ |
293 | // contains absolute locations to other things which eventually␊ |
294 | // makes a BIOS call from real mode which of course won't work␊ |
295 | // because we're stuck in extended memory at this point.␊ |
296 | struct multiboot_info *mi_p = copyMultibootInfo(multiboot_magic, mi_orig);␊ |
297 | ␊ |
298 | // Get us in to low memory so we can run everything␊ |
299 | ␊ |
300 | // We cannot possibly be more than 383.5k and copying extra won't really hurt anything␊ |
301 | // We use the address of the assembly entrypoint to get our starting location.␊ |
302 | memcpy(&boot2_sym, (char*)&boot2_sym + OFFSET_1MEG, 0x5fe00 /* 383.5k */);␊ |
303 | ␊ |
304 | // This is a little assembler routine that returns to us in the correct selector␊ |
305 | // instead of the kernel selector we're running in now and at the correct␊ |
306 | // instruction pointer ( current minus 1 MB ). It does not fix our return␊ |
307 | // address nor does it fix the return address of our caller.␊ |
308 | continue_at_low_address();␊ |
309 | ␊ |
310 | // Now fix our return address.␊ |
311 | FIX_RETURN_ADDRESS_USING_FIRST_ARG(multiboot_magic);␊ |
312 | ␊ |
313 | // We can now do just about anything, including return to our caller correctly.␊ |
314 | // However, our caller must fix his return address if he wishes to return to␊ |
315 | // his caller and so on and so forth.␊ |
316 | ␊ |
317 | /* Zero the BSS and initialize malloc */␊ |
318 | initialize_runtime();␊ |
319 | ␊ |
320 | gMI = mi_p;␊ |
321 | ␊ |
322 | /* Set up a temporary bootArgs so we can call console output routines␊ |
323 | like printf that check the v_display. Note that we purposefully␊ |
324 | do not initialize anything else at this early stage.␊ |
325 | ␊ |
326 | We are reasonably sure we're already in text mode if GRUB booted us.␊ |
327 | This is the same assumption that initKernBootStruct makes.␊ |
328 | We could check the multiboot info I guess, but why bother?␊ |
329 | */␊ |
330 | boot_args temporaryBootArgsData;␊ |
331 | bzero(&temporaryBootArgsData, sizeof(boot_args));␊ |
332 | bootArgs = &temporaryBootArgsData;␊ |
333 | bootArgs->Video.v_display = VGA_TEXT_MODE;␊ |
334 | ␊ |
335 | // Install ramdisk and extra driver hooks␊ |
336 | p_get_ramdisk_info = &multiboot_get_ramdisk_info;␊ |
337 | p_ramdiskReadBytes = &multibootRamdiskReadBytes;␊ |
338 | LoadExtraDrivers_p = &multiboot_LoadExtraDrivers;␊ |
339 | ␊ |
340 | // Since we call multiboot ourselves, its return address will be correct.␊ |
341 | // That is unless it's inlined in which case it does not matter.␊ |
342 | uint32_t bootdevice = multiboot(multiboot_magic, mi_p);␊ |
343 | // We're about to exit and temporaryBootArgs will no longer be valid␊ |
344 | bootArgs = NULL;␊ |
345 | return bootdevice;␊ |
346 | }␊ |
347 | ␊ |
348 | enum {␊ |
349 | kReturnKey = 0x0d,␊ |
350 | kEscapeKey = 0x1b,␊ |
351 | kBackspaceKey = 0x08,␊ |
352 | kASCIIKeyMask = 0x7f␊ |
353 | };␊ |
354 | ␊ |
355 | // This is the meat of our implementation. It grabs the boot device from␊ |
356 | // the multiboot_info and returns it as is. If it fails it returns␊ |
357 | // BAD_BOOT_DEVICE. We can call an awful lot of libsa and libsaio but␊ |
358 | // we need to take care not to call anything that requires malloc because␊ |
359 | // it won't be initialized until boot() does it.␊ |
360 | static inline uint32_t multiboot(int multiboot_magic, struct multiboot_info *mi)␊ |
361 | {␊ |
362 | if(multiboot_magic != MULTIBOOT_INFO_MAGIC)␊ |
363 | {␊ |
364 | printf("Wrong Multiboot magic\n");␊ |
365 | sleep(2);␊ |
366 | return BAD_BOOT_DEVICE;␊ |
367 | }␊ |
368 | printf("Multiboot info @0x%x\n", (uint32_t)mi);␊ |
369 | if(mi->mi_flags & MULTIBOOT_INFO_HAS_LOADER_NAME)␊ |
370 | printf("Loaded by %s\n", mi->mi_loader_name);␊ |
371 | ␊ |
372 | // Multiboot puts boot device in high byte␊ |
373 | // Normal booter wants it in low byte␊ |
374 | int bootdevice = mi->mi_boot_device_drive;␊ |
375 | ␊ |
376 | bool doSelectDevice = false;␊ |
377 | if(mi->mi_flags & MULTIBOOT_INFO_HAS_BOOT_DEVICE)␊ |
378 | {␊ |
379 | printf("Boot device 0x%x\n", bootdevice);␊ |
380 | }␊ |
381 | else␊ |
382 | {␊ |
383 | printf("Multiboot info does not include chosen boot device\n");␊ |
384 | doSelectDevice = true;␊ |
385 | bootdevice = BAD_BOOT_DEVICE;␊ |
386 | }␊ |
387 | if(mi->mi_flags & MULTIBOOT_INFO_HAS_CMDLINE)␊ |
388 | {␊ |
389 | const char *val;␊ |
390 | int size;␊ |
391 | ␊ |
392 | if(getValueForBootKey(mi->mi_cmdline, "biosdev", &val, &size))␊ |
393 | {␊ |
394 | char *endptr;␊ |
395 | int intVal = strtol(val, &endptr, 16 /* always hex */);␊ |
396 | if(*val != '\0' && (*endptr == '\0' || *endptr == ' ' || *endptr == '\t'))␊ |
397 | {␊ |
398 | printf("Boot device overridden to %02x with biosdev=%s\n", intVal, val);␊ |
399 | bootdevice = intVal;␊ |
400 | doSelectDevice = false;␊ |
401 | }␊ |
402 | else␊ |
403 | doSelectDevice = true;␊ |
404 | }␊ |
405 | ␉␉␊ |
406 | if(getValueForBootKey(mi->mi_cmdline, "timeout", &val, &size))␊ |
407 | {␊ |
408 | char *endptr;␊ |
409 | int intVal = strtol(val, &endptr, 0);␊ |
410 | if(*val != '\0' && (*endptr == '\0' || *endptr == ' ' || *endptr == '\t'))␊ |
411 | {␊ |
412 | printf("Timeout overridden to %d with timeout=%s\n", intVal, val);␊ |
413 | multiboot_timeout = intVal;␊ |
414 | multiboot_timeout_set = 1;␊ |
415 | }␊ |
416 | }␉␉␊ |
417 | ␉␉␊ |
418 | if(getValueForBootKey(mi->mi_cmdline, "partno", &val, &size))␊ |
419 | {␊ |
420 | char *endptr;␊ |
421 | int intVal = strtol(val, &endptr, 0);␊ |
422 | if(*val != '\0' && (*endptr == '\0' || *endptr == ' ' || *endptr == '\t'))␊ |
423 | {␊ |
424 | printf("Default partition overridden to %d with timeout=%s\n", intVal, val);␊ |
425 | multiboot_partition = intVal;␊ |
426 | multiboot_partition_set = 1;␊ |
427 | }␊ |
428 | }␉␉␉␉␊ |
429 | }␊ |
430 | if(doSelectDevice)␊ |
431 | {␊ |
432 | bootdevice = selectAlternateBootDevice(bootdevice);␊ |
433 | }␊ |
434 | if(bootdevice == BAD_BOOT_DEVICE)␊ |
435 | sleep(2); // pause for a second before halting␊ |
436 | return bootdevice;␊ |
437 | }␊ |
438 | ␊ |
439 | ///////////////////////////////////////////////////////////////////////////␊ |
440 | // Ramdisk and extra drivers code␊ |
441 | ␊ |
442 | int multibootRamdiskReadBytes( int biosdev, unsigned int blkno,␊ |
443 | unsigned int byteoff,␊ |
444 | unsigned int byteCount, void * buffer )␊ |
445 | {␊ |
446 | int module_count = gMI->mi_mods_count;␊ |
447 | struct multiboot_module *modules = (void*)gMI->mi_mods_addr;␊ |
448 | if(biosdev < 0x100)␊ |
449 | return -1;␊ |
450 | if(biosdev >= (0x100 + module_count))␊ |
451 | return -1;␊ |
452 | struct multiboot_module *module = modules + (biosdev - 0x100);␊ |
453 | ␊ |
454 | void *p_initrd = (void*)module->mm_mod_start;␊ |
455 | bcopy(p_initrd + blkno*512 + byteoff, buffer, byteCount);␊ |
456 | return 0;␊ |
457 | }␊ |
458 | ␊ |
459 | int multiboot_get_ramdisk_info(int biosdev, struct driveInfo *dip)␊ |
460 | {␊ |
461 | int module_count = gMI->mi_mods_count;␊ |
462 | struct multiboot_module *modules = (void*)gMI->mi_mods_addr;␊ |
463 | if(biosdev < 0x100)␊ |
464 | return -1;␊ |
465 | if(biosdev >= (0x100 + module_count))␊ |
466 | return -1;␊ |
467 | struct multiboot_module *module = modules + (biosdev - 0x100);␊ |
468 | dip->biosdev = biosdev;␊ |
469 | dip->uses_ebios = true;␉// XXX aserebln uses_ebios isn't a boolean at all␊ |
470 | dip->di.params.phys_sectors = (module->mm_mod_end - module->mm_mod_start + 511) / 512;␊ |
471 | dip->valid = true;␊ |
472 | return 0;␊ |
473 | }␊ |
474 | ␊ |
475 | static long multiboot_LoadExtraDrivers(FileLoadDrivers_t FileLoadDrivers_p)␊ |
476 | {␊ |
477 | char extensionsSpec[1024];␊ |
478 | int ramdiskUnit;␊ |
479 | for(ramdiskUnit = 0; ramdiskUnit < gMI->mi_mods_count; ++ramdiskUnit)␊ |
480 | {␊ |
481 | int partCount; // unused␊ |
482 | BVRef ramdiskChain = diskScanBootVolumes(0x100 + ramdiskUnit, &partCount);␊ |
483 | if(ramdiskChain == NULL)␊ |
484 | {␊ |
485 | verbose("Ramdisk contains no partitions\n");␊ |
486 | continue;␊ |
487 | }␊ |
488 | for(; ramdiskChain != NULL; ramdiskChain = ramdiskChain->next)␊ |
489 | {␊ |
490 | sprintf(extensionsSpec, "rd(%d,%d)/Extra/", ramdiskUnit, ramdiskChain->part_no);␊ |
491 | struct dirstuff *extradir = opendir(extensionsSpec);␊ |
492 | closedir(extradir);␊ |
493 | if(extradir != NULL)␊ |
494 | {␊ |
495 | int ret = FileLoadDrivers_p(extensionsSpec, 0 /* this is a kext root dir, not a kext with plugins */);␊ |
496 | if(ret != 0)␊ |
497 | {␊ |
498 | verbose("FileLoadDrivers failed on a ramdisk\n");␊ |
499 | return ret;␊ |
500 | }␊ |
501 | }␊ |
502 | }␊ |
503 | }␊ |
504 | return 0;␊ |
505 | }␊ |
506 |