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 | int multiboot_skip_partition=0;␊ |
16 | int multiboot_skip_partition_set=0;␊ |
17 | ␊ |
18 | // Global multiboot info, if using multiboot.␊ |
19 | struct multiboot_info *gMI;␊ |
20 | ␊ |
21 | extern void continue_at_low_address(void);␊ |
22 | ␊ |
23 | // prototype hi_multiboot and keep its implementation below multiboot_to_boot␊ |
24 | // to ensure that it doesn't get inlined by the compiler␊ |
25 | // We don't want it inlined because we specifically want the stack frame␊ |
26 | // pointer to be as high as possible and the hi_multiboot function␊ |
27 | // copies multiboot_info onto its stack.␊ |
28 | uint32_t hi_multiboot(int multiboot_magic, struct multiboot_info *mi_orig);␊ |
29 | // prototype dochainload for the same reason.␊ |
30 | void dochainload();␊ |
31 | ␊ |
32 | #define OFFSET_1MEG 0x100000␊ |
33 | #define BAD_BOOT_DEVICE 0xffffffff␊ |
34 | ␊ |
35 | // This assumes that the address of the first argument to the function will␊ |
36 | // be exactly 4 bytes above the address of the return address.␊ |
37 | // It is intended to be used as an lvalue with a statement like this -= OFFSET_1MEG;␊ |
38 | #define RETURN_ADDRESS_USING_FIRST_ARG(arg) \␊ |
39 | (*(uint32_t*)((char*)&(arg) - 4))␊ |
40 | ␊ |
41 | #define FIX_RETURN_ADDRESS_USING_FIRST_ARG(arg) \␊ |
42 | RETURN_ADDRESS_USING_FIRST_ARG(arg) -= OFFSET_1MEG␊ |
43 | ␊ |
44 | extern void jump_to_chainbooter();␊ |
45 | extern unsigned char chainbootdev;␊ |
46 | extern unsigned char chainbootflag;␊ |
47 | ␊ |
48 | void chainLoad();␊ |
49 | void waitThenReload();␊ |
50 | ␊ |
51 | int multibootRamdiskReadBytes( int biosdev, unsigned int blkno,␊ |
52 | unsigned int byteoff,␊ |
53 | unsigned int byteCount, void * buffer );␊ |
54 | int multiboot_get_ramdisk_info(int biosdev, struct driveInfo *dip);␊ |
55 | static long multiboot_LoadExtraDrivers(FileLoadDrivers_t FileLoadDrivers_p);␊ |
56 | ␊ |
57 | // Starts off in the multiboot context 1 MB high but eventually gets into low memory␊ |
58 | // and winds up with a bootdevice in eax which is all that boot() wants␊ |
59 | // This lets the stack pointer remain very high.␊ |
60 | // If we were to call boot directly from multiboot then the whole multiboot_info␊ |
61 | // would be on the stack which would possibly be using way too much stack.␊ |
62 | void multiboot_to_boot(int multiboot_magic, struct multiboot_info *mi_orig)␊ |
63 | {␊ |
64 | printf("multiboot_magic:%x\n",multiboot_magic);␊ |
65 | uint32_t bootdevice = hi_multiboot(multiboot_magic, mi_orig);␊ |
66 | if(bootdevice != BAD_BOOT_DEVICE)␊ |
67 | {␊ |
68 | // boot only returns to do a chain load.␊ |
69 | for(;;)␊ |
70 | { // NOTE: boot only uses the last byte (the drive number)␊ |
71 | common_boot(bootdevice);␊ |
72 | if(chainbootflag)␊ |
73 | chainLoad();␊ |
74 | else␊ |
75 | waitThenReload();␊ |
76 | }␊ |
77 | }␊ |
78 | // Avoid returning to high-memory address which isn't valid in the segment␊ |
79 | // we are now in.␊ |
80 | // Calling sleep() ensures the user ought to be able to use Ctrl+Alt+Del␊ |
81 | // because the BIOS will have interrupts on.␊ |
82 | for(;;)␊ |
83 | sleep(10);␊ |
84 | // NOTE: *IF* we needed to return we'd have to fix up our return address to␊ |
85 | // be in low memory using the same trick as below.␊ |
86 | // However, there doesn't seem to be any point in returning to assembly␊ |
87 | // particularly when the remaining code merely halts the processor.␊ |
88 | }␊ |
89 | ␊ |
90 | void chainLoad()␊ |
91 | {␊ |
92 | /* TODO: We ought to load the appropriate partition table, for example␊ |
93 | the MBR if booting a primary partition or the particular extended␊ |
94 | partition table if booting a logical drive. For example, the␊ |
95 | regular MS MBR booter will relocate itself (e.g. the MBR) from␊ |
96 | 0:7C00 to 0:0600 and will use SI as the offset when reading␊ |
97 | the partition data from itself. Thus when it jumps to the partition␊ |
98 | boot sector, SI will be 0x600 + 446 + i<<4 where i is the partition␊ |
99 | table index.␊ |
100 | ␊ |
101 | On the other hand, our code for the non-Multiboot case doesn't do␊ |
102 | this either, although GRUB does.␊ |
103 | */␊ |
104 | ␊ |
105 | const unsigned char *bootcode = (const unsigned char*)0x7c00;␊ |
106 | if(bootcode[0x1fe] == 0x55 && bootcode[0x1ff] == 0xaa)␊ |
107 | {␊ |
108 | printf("Calling chainbooter\n");␊ |
109 | jump_to_chainbooter();␊ |
110 | /* NORETURN */␊ |
111 | }␊ |
112 | else␊ |
113 | {␊ |
114 | printf("Bad chain boot sector magic: %02x%02x\n", bootcode[0x1fe], bootcode[0x1ff]);␊ |
115 | }␊ |
116 | }␊ |
117 | ␊ |
118 | void waitThenReload()␊ |
119 | {␊ |
120 | /* FIXME: Ctrl+Alt+Del does not work under Boot Camp */␊ |
121 | printf("Darwin booter exited for some reason.\n");␊ |
122 | printf("Please reboot (Ctrl+Alt+Del) your machine.\n");␊ |
123 | printf("Restarting Darwin booter in 5 seconds...");␊ |
124 | sleep(1);␊ |
125 | printf("4...");␊ |
126 | sleep(1);␊ |
127 | printf("3...");␊ |
128 | sleep(1);␊ |
129 | printf("2...");␊ |
130 | sleep(1);␊ |
131 | printf("1...");␊ |
132 | sleep(1);␊ |
133 | printf("0\n");␊ |
134 | }␊ |
135 | ␊ |
136 | // Declare boot2_sym as an opaque struct so it can't be converted to a pointer␊ |
137 | // i.e. ensure the idiot programmer (me) makes sure to use address-of␊ |
138 | // Technically it's a function but it's real mode code and we sure don't␊ |
139 | // want to call it under any circumstances.␊ |
140 | extern struct {} boot2_sym asm("boot2");␊ |
141 | ␊ |
142 | // prototype multiboot and keep its implementation below hi_multiboot to␊ |
143 | // ensure that it doesn't get inlined by the compiler␊ |
144 | static inline uint32_t multiboot(int multiboot_magic, struct multiboot_info *mi);␊ |
145 | ␊ |
146 | ␊ |
147 | /*!␊ |
148 | Returns a pointer to the first safe address we can use for stowing the multiboot info.␊ |
149 | This might actually be a bit pedantic because mboot.c32 and GRUB both stow the multiboot␊ |
150 | info in low memory meaning that the >= 128 MB location we choose is plenty high enough.␊ |
151 | */␊ |
152 | void *determine_safe_hi_addr(int multiboot_magic, struct multiboot_info *mi_orig)␊ |
153 | {␊ |
154 | // hi_addr must be at least up in 128MB+ space so it doesn't get clobbered␊ |
155 | void *hi_addr = (void*)PREBOOT_DATA;␊ |
156 | ␊ |
157 | // Fail if the magic isn't correct. We'll complain later.␊ |
158 | if(multiboot_magic != MULTIBOOT_INFO_MAGIC)␊ |
159 | return NULL;␊ |
160 | // Make sure the command-line isn't in high memory.␊ |
161 | if(mi_orig->mi_flags & MULTIBOOT_INFO_HAS_CMDLINE)␊ |
162 | {␊ |
163 | char *end = mi_orig->mi_cmdline;␊ |
164 | if(end != NULL)␊ |
165 | {␊ |
166 | for(; *end != '\0'; ++end)␊ |
167 | ;␊ |
168 | ++end;␊ |
169 | if( (void*)end > hi_addr)␊ |
170 | hi_addr = end;␊ |
171 | }␊ |
172 | }␊ |
173 | // Make sure the module information isn't in high memory␊ |
174 | if(mi_orig->mi_flags & MULTIBOOT_INFO_HAS_MODS)␊ |
175 | {␊ |
176 | struct multiboot_module *modules = (void*)mi_orig->mi_mods_addr;␊ |
177 | int i;␊ |
178 | for(i=0; i < mi_orig->mi_mods_count; ++i)␊ |
179 | {␊ |
180 | // make sure the multiboot_module struct itself won't get clobbered␊ |
181 | void *modinfo_end = modules+i+1;␊ |
182 | if(modinfo_end > hi_addr)␊ |
183 | hi_addr = modinfo_end;␊ |
184 | // make sure the module itself won't get clobbered␊ |
185 | modinfo_end = (void*)modules[i].mm_mod_end;␊ |
186 | if(modinfo_end > hi_addr)␊ |
187 | hi_addr = modinfo_end;␊ |
188 | // make sure the module string doesn't get clobbered␊ |
189 | char *end = modules[i].mm_string;␊ |
190 | for(; *end != '\0'; ++end)␊ |
191 | ;␊ |
192 | ++end;␊ |
193 | modinfo_end = end;␊ |
194 | if(modinfo_end > hi_addr)␊ |
195 | hi_addr = modinfo_end;␊ |
196 | }␊ |
197 | }␊ |
198 | // TODO: Copy syms (never needed), mmap, drives, config table, loader name, apm table, VBE info␊ |
199 | ␊ |
200 | // Round up to page size␊ |
201 | hi_addr = (void*)(((uint32_t)hi_addr + 0xfff) & ~(uint32_t)0xfff);␊ |
202 | return hi_addr;␊ |
203 | }␊ |
204 | ␊ |
205 | /*!␊ |
206 | Like malloc but with a preceding input/output parameter which points to the next available␊ |
207 | location for data. The original value of *hi_addr is returned and *hi_addr is incremented␊ |
208 | by size bytes.␊ |
209 | */␊ |
210 | void * _hi_malloc(void **hi_addr, size_t size)␊ |
211 | {␊ |
212 | void *ret = *hi_addr;␊ |
213 | *hi_addr += size;␊ |
214 | return ret;␊ |
215 | }␊ |
216 | ␊ |
217 | /*!␊ |
218 | Like strdup but with a preceding input/output parameter. The original value of *hi_addr is␊ |
219 | returned and *hi_addr is incremented by the number of bytes necessary to complete the string␊ |
220 | copy including its NUL terminator.␊ |
221 | */␊ |
222 | char * _hi_strdup(void **hi_addr, char *src)␊ |
223 | {␊ |
224 | char *dstStart;␊ |
225 | char *dst = dstStart = *hi_addr;␊ |
226 | for(; *src != '\0'; ++src, ++dst, ++(*hi_addr))␊ |
227 | *dst = *src;␊ |
228 | *dst = '\0';␊ |
229 | ++(*hi_addr);␊ |
230 | return dstStart;␊ |
231 | }␊ |
232 | ␊ |
233 | // Convenience macros␊ |
234 | #define hi_malloc(size) _hi_malloc(&hi_addr, (size))␊ |
235 | #define hi_strdup(src) _hi_strdup(&hi_addr, (src))␊ |
236 | ␊ |
237 | /*!␊ |
238 | Copies the Multiboot info and any associated data (e.g. various strings and any multiboot modules)␊ |
239 | up to very high RAM (above 128 MB) to ensure it doesn't get clobbered by the booter.␊ |
240 | */␊ |
241 | struct multiboot_info * copyMultibootInfo(int multiboot_magic, struct multiboot_info *mi_orig)␊ |
242 | {␊ |
243 | void *hi_addr = determine_safe_hi_addr(multiboot_magic, mi_orig);␊ |
244 | if(hi_addr == NULL)␊ |
245 | return NULL;␊ |
246 | ␊ |
247 | struct multiboot_info *mi_copy = hi_malloc(sizeof(*mi_copy));␊ |
248 | memcpy(mi_copy, mi_orig, sizeof(*mi_copy));␊ |
249 | ␊ |
250 | // Copy the command line␊ |
251 | if(mi_orig->mi_flags & MULTIBOOT_INFO_HAS_CMDLINE)␊ |
252 | {␊ |
253 | mi_copy->mi_cmdline = hi_strdup(mi_orig->mi_cmdline);␊ |
254 | }␊ |
255 | // Copy the loader name␊ |
256 | if(mi_orig->mi_flags & MULTIBOOT_INFO_HAS_LOADER_NAME)␊ |
257 | {␊ |
258 | mi_copy->mi_loader_name = hi_strdup(mi_orig->mi_loader_name);␊ |
259 | }␊ |
260 | // Copy the module info␊ |
261 | if(mi_orig->mi_flags & MULTIBOOT_INFO_HAS_MODS)␊ |
262 | {␊ |
263 | struct multiboot_module *dst_modules = hi_malloc(sizeof(*dst_modules)*mi_orig->mi_mods_count);␊ |
264 | struct multiboot_module *src_modules = (void*)mi_orig->mi_mods_addr;␊ |
265 | mi_copy->mi_mods_addr = (uint32_t)dst_modules;␊ |
266 | ␊ |
267 | // Copy all of the module info plus the actual module into high memory␊ |
268 | int i;␊ |
269 | for(i=0; i < mi_orig->mi_mods_count; ++i)␊ |
270 | {␊ |
271 | // Assume mod_end is 1 past the actual end (i.e. it is start + size, not really end (i.e. start + size - 1))␊ |
272 | // This is what GRUB and mboot.c32 do although the spec is unclear on this.␊ |
273 | uint32_t mod_length = src_modules[i].mm_mod_end - src_modules[i].mm_mod_start;␊ |
274 | ␊ |
275 | dst_modules[i].mm_mod_start = (uint32_t)hi_malloc(mod_length);␊ |
276 | dst_modules[i].mm_mod_end = (uint32_t)dst_modules[i].mm_mod_start + mod_length;␊ |
277 | memcpy((char*)dst_modules[i].mm_mod_start, (char*)src_modules[i].mm_mod_start, mod_length);␊ |
278 | ␊ |
279 | dst_modules[i].mm_string = hi_strdup(src_modules[i].mm_string);␊ |
280 | dst_modules[i].mm_reserved = src_modules[i].mm_reserved;␊ |
281 | }␊ |
282 | }␊ |
283 | // Make sure that only stuff that didn't need to be copied or that we did deep copy is indicated in the copied struct.␊ |
284 | 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;␊ |
285 | ␊ |
286 | return mi_copy;␊ |
287 | }␊ |
288 | ␊ |
289 | // When we enter, we're actually 1 MB high.␊ |
290 | // Fortunately, memcpy is position independent, and it's all we need␊ |
291 | uint32_t hi_multiboot(int multiboot_magic, struct multiboot_info *mi_orig)␊ |
292 | {␊ |
293 | // Copy the multiboot info out of the way.␊ |
294 | // We can't bitch about the magic yet because printf won't work␊ |
295 | // because it contains an absolute location of putchar which␊ |
296 | // contains absolute locations to other things which eventually␊ |
297 | // makes a BIOS call from real mode which of course won't work␊ |
298 | // because we're stuck in extended memory at this point.␊ |
299 | struct multiboot_info *mi_p = copyMultibootInfo(multiboot_magic, mi_orig);␊ |
300 | ␊ |
301 | // Get us in to low memory so we can run everything␊ |
302 | ␊ |
303 | // We cannot possibly be more than 447k and copying extra won't really hurt anything␊ |
304 | // We use the address of the assembly entrypoint to get our starting location.␊ |
305 | memcpy(&boot2_sym, (char*)&boot2_sym + OFFSET_1MEG, BOOT2_MAX_LENGTH /* 447k */);␊ |
306 | ␊ |
307 | // This is a little assembler routine that returns to us in the correct selector␊ |
308 | // instead of the kernel selector we're running in now and at the correct␊ |
309 | // instruction pointer ( current minus 1 MB ). It does not fix our return␊ |
310 | // address nor does it fix the return address of our caller.␊ |
311 | continue_at_low_address();␊ |
312 | ␊ |
313 | // Now fix our return address.␊ |
314 | FIX_RETURN_ADDRESS_USING_FIRST_ARG(multiboot_magic);␊ |
315 | ␊ |
316 | // We can now do just about anything, including return to our caller correctly.␊ |
317 | // However, our caller must fix his return address if he wishes to return to␊ |
318 | // his caller and so on and so forth.␊ |
319 | ␊ |
320 | /* Zero the BSS and initialize malloc */␊ |
321 | initialize_runtime();␊ |
322 | ␊ |
323 | gMI = mi_p;␊ |
324 | ␊ |
325 | /* Set up a temporary bootArgs so we can call console output routines␊ |
326 | like printf that check the v_display. Note that we purposefully␊ |
327 | do not initialize anything else at this early stage.␊ |
328 | ␊ |
329 | We are reasonably sure we're already in text mode if GRUB booted us.␊ |
330 | This is the same assumption that initKernBootStruct makes.␊ |
331 | We could check the multiboot info I guess, but why bother?␊ |
332 | */␊ |
333 | boot_args temporaryBootArgsData;␊ |
334 | bzero(&temporaryBootArgsData, sizeof(boot_args));␊ |
335 | bootArgs = &temporaryBootArgsData;␊ |
336 | bootArgs->Video.v_display = VGA_TEXT_MODE;␊ |
337 | ␊ |
338 | // Install ramdisk and extra driver hooks␊ |
339 | p_get_ramdisk_info = &multiboot_get_ramdisk_info;␊ |
340 | p_ramdiskReadBytes = &multibootRamdiskReadBytes;␊ |
341 | LoadExtraDrivers_p = &multiboot_LoadExtraDrivers;␊ |
342 | ␊ |
343 | // Since we call multiboot ourselves, its return address will be correct.␊ |
344 | // That is unless it's inlined in which case it does not matter.␊ |
345 | uint32_t bootdevice = multiboot(multiboot_magic, mi_p);␊ |
346 | // We're about to exit and temporaryBootArgs will no longer be valid␊ |
347 | bootArgs = NULL;␊ |
348 | return bootdevice;␊ |
349 | }␊ |
350 | ␊ |
351 | // This is the meat of our implementation. It grabs the boot device from␊ |
352 | // the multiboot_info and returns it as is. If it fails it returns␊ |
353 | // BAD_BOOT_DEVICE. We can call an awful lot of libsa and libsaio but␊ |
354 | // we need to take care not to call anything that requires malloc because␊ |
355 | // it won't be initialized until boot() does it.␊ |
356 | static inline uint32_t multiboot(int multiboot_magic, struct multiboot_info *mi)␊ |
357 | {␊ |
358 | if(multiboot_magic != MULTIBOOT_INFO_MAGIC)␊ |
359 | {␊ |
360 | printf("Wrong Multiboot magic\n");␊ |
361 | sleep(2);␊ |
362 | return BAD_BOOT_DEVICE;␊ |
363 | }␊ |
364 | printf("Multiboot info @0x%x\n", (uint32_t)mi);␊ |
365 | if(mi->mi_flags & MULTIBOOT_INFO_HAS_LOADER_NAME)␊ |
366 | printf("Loaded by %s\n", mi->mi_loader_name);␊ |
367 | ␊ |
368 | // Multiboot puts boot device in high byte␊ |
369 | // Normal booter wants it in low byte␊ |
370 | int bootdevice = mi->mi_boot_device_drive;␊ |
371 | ␊ |
372 | bool doSelectDevice = false;␊ |
373 | if(mi->mi_flags & MULTIBOOT_INFO_HAS_BOOT_DEVICE)␊ |
374 | {␊ |
375 | printf("Boot device 0x%x\n", bootdevice);␊ |
376 | }␊ |
377 | else␊ |
378 | {␊ |
379 | printf("Multiboot info does not include chosen boot device\n");␊ |
380 | doSelectDevice = true;␊ |
381 | bootdevice = BAD_BOOT_DEVICE;␊ |
382 | }␊ |
383 | if(mi->mi_flags & MULTIBOOT_INFO_HAS_CMDLINE)␊ |
384 | {␊ |
385 | const char *val;␊ |
386 | int size;␊ |
387 | ␊ |
388 | if(getValueForBootKey(mi->mi_cmdline, "biosdev", &val, &size))␊ |
389 | {␊ |
390 | char *endptr;␊ |
391 | int intVal = strtol(val, &endptr, 16 /* always hex */);␊ |
392 | if(*val != '\0' && (*endptr == '\0' || *endptr == ' ' || *endptr == '\t'))␊ |
393 | {␊ |
394 | printf("Boot device overridden to %02x with biosdev=%s\n", intVal, val);␊ |
395 | bootdevice = intVal;␊ |
396 | doSelectDevice = false;␊ |
397 | }␊ |
398 | else␊ |
399 | doSelectDevice = true;␊ |
400 | }␊ |
401 | ␉␉␊ |
402 | if(getValueForBootKey(mi->mi_cmdline, "timeout", &val, &size))␊ |
403 | {␊ |
404 | char *endptr;␊ |
405 | int intVal = strtol(val, &endptr, 0);␊ |
406 | if(*val != '\0' && (*endptr == '\0' || *endptr == ' ' || *endptr == '\t'))␊ |
407 | {␊ |
408 | printf("Timeout overridden to %d with timeout=%s\n", intVal, val);␊ |
409 | multiboot_timeout = intVal;␊ |
410 | multiboot_timeout_set = 1;␊ |
411 | }␊ |
412 | }␉␉␊ |
413 | ␉␉␊ |
414 | if(getValueForBootKey(mi->mi_cmdline, "partno", &val, &size))␊ |
415 | {␊ |
416 | char *endptr;␊ |
417 | int intVal = strtol(val, &endptr, 0);␊ |
418 | if(*val != '\0' && (*endptr == '\0' || *endptr == ' ' || *endptr == '\t'))␊ |
419 | {␊ |
420 | printf("Default partition overridden to %d with partno=%s\n", intVal, val);␊ |
421 | multiboot_partition = intVal;␊ |
422 | multiboot_partition_set = 1;␊ |
423 | }␊ |
424 | }␊ |
425 | if(getValueForBootKey(mi->mi_cmdline, "skip_partno", &val, &size))␊ |
426 | {␊ |
427 | char *endptr;␊ |
428 | int intVal = strtol(val, &endptr, 0);␊ |
429 | if(*val != '\0' && (*endptr == '\0' || *endptr == ' ' || *endptr == '\t'))␊ |
430 | {␊ |
431 | printf("Skipping partition %d with skip_partno=%s\n", intVal, val);␊ |
432 | multiboot_skip_partition = intVal;␊ |
433 | multiboot_skip_partition_set = 1;␊ |
434 | }␊ |
435 | }␉␉␉␉␊ |
436 | }␊ |
437 | if(doSelectDevice)␊ |
438 | {␊ |
439 | bootdevice = selectAlternateBootDevice(bootdevice);␊ |
440 | }␊ |
441 | if(bootdevice == BAD_BOOT_DEVICE)␊ |
442 | sleep(2); // pause for a second before halting␊ |
443 | return bootdevice;␊ |
444 | }␊ |
445 | ␊ |
446 | ///////////////////////////////////////////////////////////////////////////␊ |
447 | // Ramdisk and extra drivers code␊ |
448 | ␊ |
449 | int multibootRamdiskReadBytes( int biosdev, unsigned int blkno,␊ |
450 | unsigned int byteoff,␊ |
451 | unsigned int byteCount, void * buffer )␊ |
452 | {␊ |
453 | int module_count = gMI->mi_mods_count;␊ |
454 | struct multiboot_module *modules = (void*)gMI->mi_mods_addr;␊ |
455 | if(biosdev < 0x100)␊ |
456 | return -1;␊ |
457 | if(biosdev >= (0x100 + module_count))␊ |
458 | return -1;␊ |
459 | struct multiboot_module *module = modules + (biosdev - 0x100);␊ |
460 | ␊ |
461 | void *p_initrd = (void*)module->mm_mod_start;␊ |
462 | bcopy(p_initrd + blkno*512 + byteoff, buffer, byteCount);␊ |
463 | return 0;␊ |
464 | }␊ |
465 | ␊ |
466 | int multiboot_get_ramdisk_info(int biosdev, struct driveInfo *dip)␊ |
467 | {␊ |
468 | int module_count = gMI->mi_mods_count;␊ |
469 | struct multiboot_module *modules = (void*)gMI->mi_mods_addr;␊ |
470 | if(biosdev < 0x100)␊ |
471 | return -1;␊ |
472 | if(biosdev >= (0x100 + module_count))␊ |
473 | return -1;␊ |
474 | struct multiboot_module *module = modules + (biosdev - 0x100);␊ |
475 | dip->biosdev = biosdev;␊ |
476 | dip->uses_ebios = true;␉// XXX aserebln uses_ebios isn't a boolean at all␊ |
477 | dip->di.params.phys_sectors = (module->mm_mod_end - module->mm_mod_start + 511) / 512;␊ |
478 | dip->valid = true;␊ |
479 | return 0;␊ |
480 | }␊ |
481 | ␊ |
482 | static long multiboot_LoadExtraDrivers(FileLoadDrivers_t FileLoadDrivers_p)␊ |
483 | {␊ |
484 | char extensionsSpec[1024];␊ |
485 | int ramdiskUnit;␊ |
486 | for(ramdiskUnit = 0; ramdiskUnit < gMI->mi_mods_count; ++ramdiskUnit)␊ |
487 | {␊ |
488 | int partCount; // unused␊ |
489 | BVRef ramdiskChain = diskScanBootVolumes(0x100 + ramdiskUnit, &partCount);␊ |
490 | if(ramdiskChain == NULL)␊ |
491 | {␊ |
492 | verbose("Ramdisk contains no partitions\n");␊ |
493 | continue;␊ |
494 | }␊ |
495 | for(; ramdiskChain != NULL; ramdiskChain = ramdiskChain->next)␊ |
496 | {␊ |
497 | sprintf(extensionsSpec, "rd(%d,%d)/Extra/", ramdiskUnit, ramdiskChain->part_no);␊ |
498 | struct dirstuff *extradir = opendir(extensionsSpec);␊ |
499 | closedir(extradir);␊ |
500 | if(extradir != NULL)␊ |
501 | {␊ |
502 | int ret = FileLoadDrivers_p(extensionsSpec, 0 /* this is a kext root dir, not a kext with plugins */);␊ |
503 | if(ret != 0)␊ |
504 | {␊ |
505 | verbose("FileLoadDrivers failed on a ramdisk\n");␊ |
506 | return ret;␊ |
507 | }␊ |
508 | }␊ |
509 | }␊ |
510 | }␊ |
511 | return 0;␊ |
512 | }␊ |
513 | |