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Source at commit 2740 created 8 years 11 months ago. By ifabio, sync with trunk. | |
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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 | int multiboot_skip_partition=0;␊ |
16 | int multiboot_skip_partition_set=0;␊ |
17 | ␊ |
18 | void boot(int biosdev);␊ |
19 | ␊ |
20 | // Global multiboot info, if using multiboot.␊ |
21 | struct multiboot_info *gMI;␊ |
22 | ␊ |
23 | extern void continue_at_low_address(void);␊ |
24 | ␊ |
25 | // prototype hi_multiboot and keep its implementation below multiboot_to_boot␊ |
26 | // to ensure that it doesn't get inlined by the compiler␊ |
27 | // We don't want it inlined because we specifically want the stack frame␊ |
28 | // pointer to be as high as possible and the hi_multiboot function␊ |
29 | // copies multiboot_info onto its stack.␊ |
30 | uint32_t hi_multiboot(int multiboot_magic, struct multiboot_info *mi_orig);␊ |
31 | // prototype dochainload for the same reason.␊ |
32 | void dochainload();␊ |
33 | ␊ |
34 | #define OFFSET_1MEG 0x100000␊ |
35 | #define BAD_BOOT_DEVICE 0xffffffff␊ |
36 | ␊ |
37 | // This assumes that the address of the first argument to the function will␊ |
38 | // be exactly 4 bytes above the address of the return address.␊ |
39 | // It is intended to be used as an lvalue with a statement like this -= OFFSET_1MEG;␊ |
40 | #define RETURN_ADDRESS_USING_FIRST_ARG(arg) \␊ |
41 | (*(uint32_t*)((char*)&(arg) - 4))␊ |
42 | ␊ |
43 | #define FIX_RETURN_ADDRESS_USING_FIRST_ARG(arg) \␊ |
44 | RETURN_ADDRESS_USING_FIRST_ARG(arg) -= OFFSET_1MEG␊ |
45 | ␊ |
46 | extern void jump_to_chainbooter();␊ |
47 | extern unsigned char chainbootdev;␊ |
48 | extern unsigned char chainbootflag;␊ |
49 | ␊ |
50 | void chainLoad();␊ |
51 | void waitThenReload();␊ |
52 | ␊ |
53 | int multibootRamdiskReadBytes( int biosdev, unsigned int blkno,␊ |
54 | unsigned int byteoff,␊ |
55 | unsigned int byteCount, void * buffer );␊ |
56 | int multiboot_get_ramdisk_info(int biosdev, struct driveInfo *dip);␊ |
57 | static long multiboot_LoadExtraDrivers(FileLoadDrivers_t FileLoadDrivers_p);␊ |
58 | ␊ |
59 | // Starts off in the multiboot context 1 MB high but eventually gets into low memory␊ |
60 | // and winds up with a bootdevice in eax which is all that boot() wants␊ |
61 | // This lets the stack pointer remain very high.␊ |
62 | // If we were to call boot directly from multiboot then the whole multiboot_info␊ |
63 | // would be on the stack which would possibly be using way too much stack.␊ |
64 | void multiboot_to_boot(int multiboot_magic, struct multiboot_info *mi_orig)␊ |
65 | {␊ |
66 | hi_multiboot(multiboot_magic, mi_orig);␊ |
67 | }␊ |
68 | ␊ |
69 | void chainLoad()␊ |
70 | {␊ |
71 | /* TODO: We ought to load the appropriate partition table, for example␊ |
72 | the MBR if booting a primary partition or the particular extended␊ |
73 | partition table if booting a logical drive. For example, the␊ |
74 | regular MS MBR booter will relocate itself (e.g. the MBR) from␊ |
75 | 0:7C00 to 0:0600 and will use SI as the offset when reading␊ |
76 | the partition data from itself. Thus when it jumps to the partition␊ |
77 | boot sector, SI will be 0x600 + 446 + i<<4 where i is the partition␊ |
78 | table index.␊ |
79 | ␊ |
80 | On the other hand, our code for the non-Multiboot case doesn't do␊ |
81 | this either, although GRUB does.␊ |
82 | */␊ |
83 | ␊ |
84 | const unsigned char *bootcode = (const unsigned char*)0x7c00;␊ |
85 | if(bootcode[0x1fe] == 0x55 && bootcode[0x1ff] == 0xaa)␊ |
86 | {␊ |
87 | printf("Calling chainbooter\n");␊ |
88 | jump_to_chainbooter();␊ |
89 | /* NORETURN */␊ |
90 | }␊ |
91 | else␊ |
92 | {␊ |
93 | printf("Bad chain boot sector magic: %02x%02x\n", bootcode[0x1fe], bootcode[0x1ff]);␊ |
94 | }␊ |
95 | }␊ |
96 | ␊ |
97 | void waitThenReload()␊ |
98 | {␊ |
99 | /* FIXME: Ctrl+Alt+Del does not work under Boot Camp */␊ |
100 | printf("Darwin booter exited for some reason.\n");␊ |
101 | printf("Please reboot (Ctrl+Alt+Del) your machine.\n");␊ |
102 | printf("Restarting Darwin booter in 5 seconds...");␊ |
103 | sleep(1);␊ |
104 | printf("4...");␊ |
105 | sleep(1);␊ |
106 | printf("3...");␊ |
107 | sleep(1);␊ |
108 | printf("2...");␊ |
109 | sleep(1);␊ |
110 | printf("1...");␊ |
111 | sleep(1);␊ |
112 | printf("0\n");␊ |
113 | }␊ |
114 | ␊ |
115 | // Declare boot2_sym as an opaque struct so it can't be converted to a pointer␊ |
116 | // i.e. ensure the idiot programmer (me) makes sure to use address-of␊ |
117 | // Technically it's a function but it's real mode code and we sure don't␊ |
118 | // want to call it under any circumstances.␊ |
119 | extern struct {} boot2_sym asm("boot2");␊ |
120 | ␊ |
121 | // prototype multiboot and keep its implementation below hi_multiboot to␊ |
122 | // ensure that it doesn't get inlined by the compiler␊ |
123 | static inline uint32_t multiboot(int multiboot_magic, struct multiboot_info *mi);␊ |
124 | ␊ |
125 | ␊ |
126 | /*!␊ |
127 | Returns a pointer to the first safe address we can use for stowing the multiboot info.␊ |
128 | This might actually be a bit pedantic because mboot.c32 and GRUB both stow the multiboot␊ |
129 | info in low memory meaning that the >= 128 MB location we choose is plenty high enough.␊ |
130 | */␊ |
131 | void *determine_safe_hi_addr(int multiboot_magic, struct multiboot_info *mi_orig)␊ |
132 | {␊ |
133 | // hi_addr must be at least up in 128MB+ space so it doesn't get clobbered␊ |
134 | void *hi_addr = (void*)PREBOOT_DATA;␊ |
135 | ␊ |
136 | // Fail if the magic isn't correct. We'll complain later.␊ |
137 | if(multiboot_magic != MULTIBOOT_INFO_MAGIC)␊ |
138 | return NULL;␊ |
139 | // Make sure the command-line isn't in high memory.␊ |
140 | if(mi_orig->mi_flags & MULTIBOOT_INFO_HAS_CMDLINE)␊ |
141 | {␊ |
142 | char *end = mi_orig->mi_cmdline;␊ |
143 | if(end != NULL)␊ |
144 | {␊ |
145 | for(; *end != '\0'; ++end)␊ |
146 | ;␊ |
147 | ++end;␊ |
148 | if( (void*)end > hi_addr)␊ |
149 | hi_addr = end;␊ |
150 | }␊ |
151 | }␊ |
152 | // Make sure the module information isn't in high memory␊ |
153 | if(mi_orig->mi_flags & MULTIBOOT_INFO_HAS_MODS)␊ |
154 | {␊ |
155 | struct multiboot_module *modules = (void*)mi_orig->mi_mods_addr;␊ |
156 | int i;␊ |
157 | for(i=0; i < mi_orig->mi_mods_count; ++i)␊ |
158 | {␊ |
159 | // make sure the multiboot_module struct itself won't get clobbered␊ |
160 | void *modinfo_end = modules+i+1;␊ |
161 | if(modinfo_end > hi_addr)␊ |
162 | hi_addr = modinfo_end;␊ |
163 | // make sure the module itself won't get clobbered␊ |
164 | modinfo_end = (void*)modules[i].mm_mod_end;␊ |
165 | if(modinfo_end > hi_addr)␊ |
166 | hi_addr = modinfo_end;␊ |
167 | // make sure the module string doesn't get clobbered␊ |
168 | char *end = modules[i].mm_string;␊ |
169 | for(; *end != '\0'; ++end)␊ |
170 | ;␊ |
171 | ++end;␊ |
172 | modinfo_end = end;␊ |
173 | if(modinfo_end > hi_addr)␊ |
174 | hi_addr = modinfo_end;␊ |
175 | }␊ |
176 | }␊ |
177 | // TODO: Copy syms (never needed), mmap, drives, config table, loader name, apm table, VBE info␊ |
178 | ␊ |
179 | // Round up to page size␊ |
180 | hi_addr = (void*)(((uint32_t)hi_addr + 0xfff) & ~(uint32_t)0xfff);␊ |
181 | return hi_addr;␊ |
182 | }␊ |
183 | ␊ |
184 | /*!␊ |
185 | Like malloc but with a preceding input/output parameter which points to the next available␊ |
186 | location for data. The original value of *hi_addr is returned and *hi_addr is incremented␊ |
187 | by size bytes.␊ |
188 | */␊ |
189 | void * _hi_malloc(void **hi_addr, size_t size)␊ |
190 | {␊ |
191 | void *ret = *hi_addr;␊ |
192 | *hi_addr += size;␊ |
193 | return ret;␊ |
194 | }␊ |
195 | ␊ |
196 | /*!␊ |
197 | Like strdup but with a preceding input/output parameter. The original value of *hi_addr is␊ |
198 | returned and *hi_addr is incremented by the number of bytes necessary to complete the string␊ |
199 | copy including its NUL terminator.␊ |
200 | */␊ |
201 | char * _hi_strdup(void **hi_addr, char *src)␊ |
202 | {␊ |
203 | char *dstStart;␊ |
204 | char *dst = dstStart = *hi_addr;␊ |
205 | for(; *src != '\0'; ++src, ++dst, ++(*hi_addr))␊ |
206 | *dst = *src;␊ |
207 | *dst = '\0';␊ |
208 | ++(*hi_addr);␊ |
209 | return dstStart;␊ |
210 | }␊ |
211 | ␊ |
212 | // Convenience macros␊ |
213 | #define hi_malloc(size) _hi_malloc(&hi_addr, (size))␊ |
214 | #define hi_strdup(src) _hi_strdup(&hi_addr, (src))␊ |
215 | ␊ |
216 | /*!␊ |
217 | Copies the Multiboot info and any associated data (e.g. various strings and any multiboot modules)␊ |
218 | up to very high RAM (above 128 MB) to ensure it doesn't get clobbered by the booter.␊ |
219 | */␊ |
220 | struct multiboot_info * copyMultibootInfo(int multiboot_magic, struct multiboot_info *mi_orig)␊ |
221 | {␊ |
222 | void *hi_addr = determine_safe_hi_addr(multiboot_magic, mi_orig);␊ |
223 | if(hi_addr == NULL)␊ |
224 | return NULL;␊ |
225 | ␊ |
226 | struct multiboot_info *mi_copy = hi_malloc(sizeof(*mi_copy));␊ |
227 | memcpy(mi_copy, mi_orig, sizeof(*mi_copy));␊ |
228 | ␊ |
229 | // Copy the command line␊ |
230 | if(mi_orig->mi_flags & MULTIBOOT_INFO_HAS_CMDLINE)␊ |
231 | {␊ |
232 | mi_copy->mi_cmdline = hi_strdup(mi_orig->mi_cmdline);␊ |
233 | }␊ |
234 | // Copy the loader name␊ |
235 | if(mi_orig->mi_flags & MULTIBOOT_INFO_HAS_LOADER_NAME)␊ |
236 | {␊ |
237 | mi_copy->mi_loader_name = hi_strdup(mi_orig->mi_loader_name);␊ |
238 | }␊ |
239 | // Copy the module info␊ |
240 | if(mi_orig->mi_flags & MULTIBOOT_INFO_HAS_MODS)␊ |
241 | {␊ |
242 | struct multiboot_module *dst_modules = hi_malloc(sizeof(*dst_modules)*mi_orig->mi_mods_count);␊ |
243 | struct multiboot_module *src_modules = (void*)mi_orig->mi_mods_addr;␊ |
244 | mi_copy->mi_mods_addr = (uint32_t)dst_modules;␊ |
245 | ␊ |
246 | // Copy all of the module info plus the actual module into high memory␊ |
247 | int i;␊ |
248 | for(i=0; i < mi_orig->mi_mods_count; ++i)␊ |
249 | {␊ |
250 | // Assume mod_end is 1 past the actual end (i.e. it is start + size, not really end (i.e. start + size - 1))␊ |
251 | // This is what GRUB and mboot.c32 do although the spec is unclear on this.␊ |
252 | uint32_t mod_length = src_modules[i].mm_mod_end - src_modules[i].mm_mod_start;␊ |
253 | ␊ |
254 | dst_modules[i].mm_mod_start = (uint32_t)hi_malloc(mod_length);␊ |
255 | dst_modules[i].mm_mod_end = (uint32_t)dst_modules[i].mm_mod_start + mod_length;␊ |
256 | memcpy((char*)dst_modules[i].mm_mod_start, (char*)src_modules[i].mm_mod_start, mod_length);␊ |
257 | ␊ |
258 | dst_modules[i].mm_string = hi_strdup(src_modules[i].mm_string);␊ |
259 | dst_modules[i].mm_reserved = src_modules[i].mm_reserved;␊ |
260 | }␊ |
261 | }␊ |
262 | // Make sure that only stuff that didn't need to be copied or that we did deep copy is indicated in the copied struct.␊ |
263 | 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;␊ |
264 | ␊ |
265 | return mi_copy;␊ |
266 | }␊ |
267 | ␊ |
268 | // When we enter, we're actually 1 MB high.␊ |
269 | // Fortunately, memcpy is position independent, and it's all we need␊ |
270 | uint32_t hi_multiboot(int multiboot_magic, struct multiboot_info *mi_orig)␊ |
271 | {␊ |
272 | // Copy the multiboot info out of the way.␊ |
273 | // We can't bitch about the magic yet because printf won't work␊ |
274 | // because it contains an absolute location of putchar which␊ |
275 | // contains absolute locations to other things which eventually␊ |
276 | // makes a BIOS call from real mode which of course won't work␊ |
277 | // because we're stuck in extended memory at this point.␊ |
278 | struct multiboot_info *mi_p = copyMultibootInfo(multiboot_magic, mi_orig);␊ |
279 | ␊ |
280 | // Get us in to low memory so we can run everything␊ |
281 | ␊ |
282 | // We cannot possibly be more than 447k and copying extra won't really hurt anything␊ |
283 | // We use the address of the assembly entrypoint to get our starting location.␊ |
284 | memcpy(&boot2_sym, (char*)&boot2_sym + OFFSET_1MEG, BOOT2_MAX_LENGTH /* 447k */);␊ |
285 | ␊ |
286 | // This is a little assembler routine that returns to us in the correct selector␊ |
287 | // instead of the kernel selector we're running in now and at the correct␊ |
288 | // instruction pointer ( current minus 1 MB ). It does not fix our return␊ |
289 | // address nor does it fix the return address of our caller.␊ |
290 | continue_at_low_address();␊ |
291 | ␊ |
292 | // Now fix our return address.␊ |
293 | ␉// JrCs: this macro should be rewritten because the code generated by XCode 4.x␊ |
294 | ␉// change the value of the argument passed as parameter (multiboot_magic)␊ |
295 | // FIX_RETURN_ADDRESS_USING_FIRST_ARG(multiboot_magic);␊ |
296 | ␊ |
297 | // We can now do just about anything, including return to our caller correctly.␊ |
298 | // However, our caller must fix his return address if he wishes to return to␊ |
299 | // his caller and so on and so forth.␊ |
300 | ␊ |
301 | /* Zero the BSS and initialize malloc */␊ |
302 | initialize_runtime();␊ |
303 | ␊ |
304 | gMI = mi_p;␊ |
305 | ␊ |
306 | /* Set up a temporary bootArgs so we can call console output routines␊ |
307 | like printf that check the v_display. Note that we purposefully␊ |
308 | do not initialize anything else at this early stage.␊ |
309 | ␊ |
310 | We are reasonably sure we're already in text mode if GRUB booted us.␊ |
311 | This is the same assumption that initKernBootStruct makes.␊ |
312 | We could check the multiboot info I guess, but why bother?␊ |
313 | */␊ |
314 | boot_args temporaryBootArgsData;␊ |
315 | bzero(&temporaryBootArgsData, sizeof(boot_args));␊ |
316 | bootArgs = &temporaryBootArgsData;␊ |
317 | bootArgs->Video.v_display = VGA_TEXT_MODE;␊ |
318 | ␊ |
319 | // Install ramdisk and extra driver hooks␊ |
320 | p_get_ramdisk_info = &multiboot_get_ramdisk_info;␊ |
321 | p_ramdiskReadBytes = &multibootRamdiskReadBytes;␊ |
322 | LoadExtraDrivers_p = &multiboot_LoadExtraDrivers;␊ |
323 | ␊ |
324 | // Since we call multiboot ourselves, its return address will be correct.␊ |
325 | // That is unless it's inlined in which case it does not matter.␊ |
326 | uint32_t bootdevice = multiboot(multiboot_magic, mi_p);␊ |
327 | ␊ |
328 | if(bootdevice != BAD_BOOT_DEVICE)␊ |
329 | {␊ |
330 | // boot only returns to do a chain load.␊ |
331 | for(;;)␊ |
332 | { // NOTE: boot only uses the last byte (the drive number)␊ |
333 | boot(bootdevice);␊ |
334 | if(chainbootflag)␊ |
335 | chainLoad();␊ |
336 | else␊ |
337 | waitThenReload();␊ |
338 | }␊ |
339 | }␊ |
340 | ␊ |
341 | // Avoid returning to high-memory address which isn't valid in the segment␊ |
342 | // we are now in.␊ |
343 | // Calling sleep() ensures the user ought to be able to use Ctrl+Alt+Del␊ |
344 | // because the BIOS will have interrupts on.␊ |
345 | for(;;)␊ |
346 | sleep(10);␊ |
347 | // NOTE: *IF* we needed to return we'd have to fix up our return address to␊ |
348 | // be in low memory using the same trick as below.␊ |
349 | // However, there doesn't seem to be any point in returning to assembly␊ |
350 | // particularly when the remaining code merely halts the processor.␊ |
351 | ␊ |
352 | // We're about to exit and temporaryBootArgs will no longer be valid␊ |
353 | bootArgs = NULL;␊ |
354 | return bootdevice;␊ |
355 | }␊ |
356 | ␊ |
357 | // This is the meat of our implementation. It grabs the boot device from␊ |
358 | // the multiboot_info and returns it as is. If it fails it returns␊ |
359 | // BAD_BOOT_DEVICE. We can call an awful lot of libsa and libsaio but␊ |
360 | // we need to take care not to call anything that requires malloc because␊ |
361 | // it won't be initialized until boot() does it.␊ |
362 | static inline uint32_t multiboot(int multiboot_magic, struct multiboot_info *mi)␊ |
363 | {␊ |
364 | if(multiboot_magic != MULTIBOOT_INFO_MAGIC)␊ |
365 | {␊ |
366 | printf("Wrong Multiboot magic\n");␊ |
367 | sleep(2);␊ |
368 | return BAD_BOOT_DEVICE;␊ |
369 | }␊ |
370 | printf("Multiboot info @0x%x\n", (uint32_t)mi);␊ |
371 | if(mi->mi_flags & MULTIBOOT_INFO_HAS_LOADER_NAME)␊ |
372 | printf("Loaded by %s\n", mi->mi_loader_name);␊ |
373 | ␊ |
374 | // Multiboot puts boot device in high byte␊ |
375 | // Normal booter wants it in low byte␊ |
376 | int bootdevice = mi->mi_boot_device_drive;␊ |
377 | ␊ |
378 | bool doSelectDevice = false;␊ |
379 | if(mi->mi_flags & MULTIBOOT_INFO_HAS_BOOT_DEVICE)␊ |
380 | {␊ |
381 | printf("Boot device 0x%x\n", bootdevice);␊ |
382 | }␊ |
383 | else␊ |
384 | {␊ |
385 | printf("Multiboot info does not include chosen boot device\n");␊ |
386 | doSelectDevice = true;␊ |
387 | bootdevice = BAD_BOOT_DEVICE;␊ |
388 | }␊ |
389 | if(mi->mi_flags & MULTIBOOT_INFO_HAS_CMDLINE)␊ |
390 | {␊ |
391 | const char *val;␊ |
392 | int size;␊ |
393 | ␊ |
394 | if(getValueForBootKey(mi->mi_cmdline, "biosdev", &val, &size))␊ |
395 | {␊ |
396 | char *endptr;␊ |
397 | int intVal = strtol(val, &endptr, 16 /* always hex */);␊ |
398 | if(*val != '\0' && (*endptr == '\0' || *endptr == ' ' || *endptr == '\t'))␊ |
399 | {␊ |
400 | printf("Boot device overridden to %02x with biosdev=%s\n", intVal, val);␊ |
401 | bootdevice = intVal;␊ |
402 | doSelectDevice = false;␊ |
403 | }␊ |
404 | else␊ |
405 | doSelectDevice = true;␊ |
406 | }␊ |
407 | ␉␉␊ |
408 | if(getValueForBootKey(mi->mi_cmdline, "timeout", &val, &size))␊ |
409 | {␊ |
410 | char *endptr;␊ |
411 | int intVal = strtol(val, &endptr, 0);␊ |
412 | if(*val != '\0' && (*endptr == '\0' || *endptr == ' ' || *endptr == '\t'))␊ |
413 | {␊ |
414 | printf("Timeout overridden to %d with timeout=%s\n", intVal, val);␊ |
415 | multiboot_timeout = intVal;␊ |
416 | multiboot_timeout_set = 1;␊ |
417 | }␊ |
418 | }␉␉␊ |
419 | ␉␉␊ |
420 | if(getValueForBootKey(mi->mi_cmdline, "partno", &val, &size))␊ |
421 | {␊ |
422 | char *endptr;␊ |
423 | int intVal = strtol(val, &endptr, 0);␊ |
424 | if(*val != '\0' && (*endptr == '\0' || *endptr == ' ' || *endptr == '\t'))␊ |
425 | {␊ |
426 | printf("Default partition overridden to %d with partno=%s\n", intVal, val);␊ |
427 | multiboot_partition = intVal;␊ |
428 | multiboot_partition_set = 1;␊ |
429 | }␊ |
430 | }␊ |
431 | if(getValueForBootKey(mi->mi_cmdline, "skip_partno", &val, &size))␊ |
432 | {␊ |
433 | char *endptr;␊ |
434 | int intVal = strtol(val, &endptr, 0);␊ |
435 | if(*val != '\0' && (*endptr == '\0' || *endptr == ' ' || *endptr == '\t'))␊ |
436 | {␊ |
437 | printf("Skipping partition %d with skip_partno=%s\n", intVal, val);␊ |
438 | multiboot_skip_partition = intVal;␊ |
439 | multiboot_skip_partition_set = 1;␊ |
440 | }␊ |
441 | }␊ |
442 | }␊ |
443 | if(doSelectDevice)␊ |
444 | {␊ |
445 | bootdevice = selectAlternateBootDevice(bootdevice);␊ |
446 | }␊ |
447 | if(bootdevice == BAD_BOOT_DEVICE)␊ |
448 | sleep(2); // pause for a second before halting␊ |
449 | return bootdevice;␊ |
450 | }␊ |
451 | ␊ |
452 | ///////////////////////////////////////////////////////////////////////////␊ |
453 | // Ramdisk and extra drivers code␊ |
454 | ␊ |
455 | int multibootRamdiskReadBytes( int biosdev, unsigned int blkno,␊ |
456 | unsigned int byteoff,␊ |
457 | unsigned int byteCount, void * buffer )␊ |
458 | {␊ |
459 | int module_count = gMI->mi_mods_count;␊ |
460 | struct multiboot_module *modules = (void*)gMI->mi_mods_addr;␊ |
461 | if(biosdev < 0x100)␊ |
462 | return -1;␊ |
463 | if(biosdev >= (0x100 + module_count))␊ |
464 | return -1;␊ |
465 | struct multiboot_module *module = modules + (biosdev - 0x100);␊ |
466 | ␊ |
467 | void *p_initrd = (void*)module->mm_mod_start;␊ |
468 | bcopy(p_initrd + blkno*512 + byteoff, buffer, byteCount);␊ |
469 | return 0;␊ |
470 | }␊ |
471 | ␊ |
472 | int multiboot_get_ramdisk_info(int biosdev, struct driveInfo *dip)␊ |
473 | {␊ |
474 | int module_count = gMI->mi_mods_count;␊ |
475 | struct multiboot_module *modules = (void*)gMI->mi_mods_addr;␊ |
476 | if(biosdev < 0x100)␊ |
477 | return -1;␊ |
478 | if(biosdev >= (0x100 + module_count))␊ |
479 | return -1;␊ |
480 | struct multiboot_module *module = modules + (biosdev - 0x100);␊ |
481 | dip->biosdev = biosdev;␊ |
482 | dip->uses_ebios = true;␉// XXX aserebln uses_ebios isn't a boolean at all␊ |
483 | dip->di.params.phys_sectors = (module->mm_mod_end - module->mm_mod_start + 511) / 512;␊ |
484 | dip->valid = true;␊ |
485 | return 0;␊ |
486 | }␊ |
487 | ␊ |
488 | static long multiboot_LoadExtraDrivers(FileLoadDrivers_t FileLoadDrivers_p)␊ |
489 | {␊ |
490 | char extensionsSpec[1024];␊ |
491 | int ramdiskUnit;␊ |
492 | for(ramdiskUnit = 0; ramdiskUnit < gMI->mi_mods_count; ++ramdiskUnit)␊ |
493 | {␊ |
494 | int partCount; // unused␊ |
495 | BVRef ramdiskChain = diskScanBootVolumes(0x100 + ramdiskUnit, &partCount);␊ |
496 | if(ramdiskChain == NULL)␊ |
497 | {␊ |
498 | verbose("Ramdisk contains no partitions\n");␊ |
499 | continue;␊ |
500 | }␊ |
501 | for(; ramdiskChain != NULL; ramdiskChain = ramdiskChain->next)␊ |
502 | {␊ |
503 | sprintf(extensionsSpec, "rd(%d,%d)/Extra/", ramdiskUnit, ramdiskChain->part_no);␊ |
504 | struct dirstuff *extradir = opendir(extensionsSpec);␊ |
505 | closedir(extradir);␊ |
506 | if(extradir != NULL)␊ |
507 | {␊ |
508 | int ret = FileLoadDrivers_p(extensionsSpec, 0 /* this is a kext root dir, not a kext with plugins */);␊ |
509 | if(ret != 0)␊ |
510 | {␊ |
511 | verbose("FileLoadDrivers failed on a ramdisk\n");␊ |
512 | return ret;␊ |
513 | }␊ |
514 | }␊ |
515 | }␊ |
516 | }␊ |
517 | return 0;␊ |
518 | }␊ |
519 |