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Root/branches/iFabio/Test/i386/boot2/boot.c

Source at commit 157 created 13 years 9 months ago.
By scrax, Made a new layout for the installer. Added advanced Options subfolder with some options to test. Added No chameleon base installation option. Updated localizable.string in IT and EN folders. New background by iFabio added
1/*␊
2 * Copyright (c) 1999-2003 Apple Computer, Inc. All rights reserved.␊
3 *␊
4 * @APPLE_LICENSE_HEADER_START@␊
5 * ␊
6 * Portions Copyright (c) 1999-2003 Apple Computer, Inc. All Rights␊
7 * Reserved. This file contains Original Code and/or Modifications of␊
8 * Original Code as defined in and that are subject to the Apple Public␊
9 * Source License Version 2.0 (the "License"). You may not use this file␊
10 * except in compliance with the License. Please obtain a copy of the␊
11 * License at http://www.apple.com/publicsource and read it before using␊
12 * this file.␊
13 * ␊
14 * The Original Code and all software distributed under the License are␊
15 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER␊
16 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,␊
17 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,␊
18 * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT. Please see the␊
19 * License for the specific language governing rights and limitations␊
20 * under the License.␊
21 * ␊
22 * @APPLE_LICENSE_HEADER_END@␊
23 */␊
24/* ␊
25 * Mach Operating System␊
26 * Copyright (c) 1990 Carnegie-Mellon University␊
27 * Copyright (c) 1989 Carnegie-Mellon University␊
28 * All rights reserved. The CMU software License Agreement specifies␊
29 * the terms and conditions for use and redistribution.␊
30 */␊
31␊
32/*␊
33 * INTEL CORPORATION PROPRIETARY INFORMATION␊
34 *␊
35 * This software is supplied under the terms of a license agreement or ␊
36 * nondisclosure agreement with Intel Corporation and may not be copied ␊
37 * nor disclosed except in accordance with the terms of that agreement.␊
38 *␊
39 * Copyright 1988, 1989 by Intel Corporation␊
40 */␊
41␊
42/*␊
43 * Copyright 1993 NeXT Computer, Inc.␊
44 * All rights reserved.␊
45 */␊
46 ␊
47/*␊
48 * Completely reworked by Sam Streeper (sam_s@NeXT.com)␊
49 * Reworked again by Curtis Galloway (galloway@NeXT.com)␊
50 */␊
51␊
52␊
53#include "boot.h"␊
54#include "bootstruct.h"␊
55#include "fake_efi.h"␊
56#include "sl.h"␊
57#include "libsa.h"␊
58#include "ramdisk.h"␊
59#include "gui.h"␊
60#include "platform.h"␊
61␊
62long gBootMode; /* defaults to 0 == kBootModeNormal */␊
63bool gOverrideKernel;␊
64static char gBootKernelCacheFile[512];␊
65static char gCacheNameAdler[64 + 256];␊
66char *gPlatformName = gCacheNameAdler;␊
67char gRootDevice[512];␊
68char gMKextName[512];␊
69char gMacOSVersion[8];␊
70bool gEnableCDROMRescan;␊
71bool gScanSingleDrive;␊
72␊
73int bvCount = 0;␊
74//int␉␉menucount = 0;␊
75int gDeviceCount = 0; ␊
76␊
77BVRef bvr;␊
78BVRef menuBVR;␊
79BVRef bvChain;␊
80bool useGUI;␊
81␊
82//static void selectBiosDevice(void);␊
83static unsigned long Adler32(unsigned char *buffer, long length);␊
84static bool getOSVersion(char *str);␊
85␊
86static bool gUnloadPXEOnExit = false;␊
87␊
88/*␊
89 * How long to wait (in seconds) to load the␊
90 * kernel after displaying the "boot:" prompt.␊
91 */␊
92#define kBootErrorTimeout 5␊
93␊
94/*␊
95 * Default path to kernel cache file␊
96 */␊
97#define kDefaultCachePath "/System/Library/Caches/com.apple.kernelcaches/kernelcache"␊
98␊
99//==========================================================================␊
100// Zero the BSS.␊
101␊
102static void zeroBSS(void)␊
103{␊
104␉extern char _DATA__bss__begin, _DATA__bss__end;␊
105␉extern char _DATA__common__begin, _DATA__common__end;␊
106␊
107␉bzero(&_DATA__bss__begin, (&_DATA__bss__end - &_DATA__bss__begin));␊
108␉bzero(&_DATA__common__begin, (&_DATA__common__end - &_DATA__common__begin));␊
109}␊
110␊
111//==========================================================================␊
112// Malloc error function␊
113␊
114static void malloc_error(char *addr, size_t size, const char *file, int line)␊
115{␊
116␉stop("\nMemory allocation error! Addr=0x%x, Size=0x%x, File=%s, Line=%d\n", (unsigned)addr, (unsigned)size, file, line);␊
117}␊
118␊
119//==========================================================================␊
120//Initializes the runtime. Right now this means zeroing the BSS and initializing malloc.␊
121//␊
122void initialize_runtime(void)␊
123{␊
124␉zeroBSS();␊
125␉malloc_init(0, 0, 0, malloc_error);␊
126}␊
127␊
128//==========================================================================␊
129// execKernel - Load the kernel image (mach-o) and jump to its entry point.␊
130␊
131static int ExecKernel(void *binary)␊
132{␊
133 entry_t kernelEntry;␊
134 int ret;␊
135␊
136 bootArgs->kaddr = bootArgs->ksize = 0;␊
137␊
138 ret = DecodeKernel(binary,␊
139 &kernelEntry,␊
140 (char **) &bootArgs->kaddr,␊
141 (int *)&bootArgs->ksize );␊
142␊
143 if ( ret != 0 )␊
144 return ret;␊
145␊
146 // Reserve space for boot args␊
147 reserveKernBootStruct();␊
148␊
149 // Load boot drivers from the specifed root path.␊
150␊
151 if (!gHaveKernelCache) {␊
152 LoadDrivers("/");␊
153 }␊
154␊
155 clearActivityIndicator();␊
156␊
157 if (gErrors) {␊
158 printf("Errors encountered while starting up the computer.\n");␊
159 printf("Pausing %d seconds...\n", kBootErrorTimeout);␊
160 sleep(kBootErrorTimeout);␊
161 }␊
162␊
163 setupFakeEfi();␊
164␊
165 md0Ramdisk();␊
166␊
167 verbose("Starting Darwin %s\n",( archCpuType == CPU_TYPE_I386 ) ? "x86" : "x86_64");␊
168␊
169 // Cleanup the PXE base code.␊
170␊
171 if ( (gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit ) {␊
172␉␉if ( (ret = nbpUnloadBaseCode()) != nbpStatusSuccess )␊
173 {␊
174 ␉printf("nbpUnloadBaseCode error %d\n", (int) ret);␊
175 sleep(2);␊
176 }␊
177 }␊
178␊
179 bool dummyVal;␊
180␉if (getBoolForKey(kWaitForKeypressKey, &dummyVal, &bootInfo->bootConfig) && dummyVal) {␊
181␉␉printf("Press any key to continue...");␊
182␉␉getc();␊
183␉}␊
184␊
185␉usb_loop();␊
186␊
187 // If we were in text mode, switch to graphics mode.␊
188 // This will draw the boot graphics unless we are in␊
189 // verbose mode.␊
190␊
191 if(gVerboseMode)␊
192 setVideoMode( GRAPHICS_MODE, 0 );␊
193 else␊
194 drawBootGraphics();␊
195␉␊
196␉setupBooterLog();␊
197␉␊
198 finalizeBootStruct();␊
199 ␊
200 // Jump to kernel's entry point. There's no going back now.␊
201␊
202 startprog( kernelEntry, bootArgs );␊
203␊
204 // Not reached␊
205␊
206 return 0;␊
207}␊
208␊
209//==========================================================================␊
210// This is the entrypoint from real-mode which functions exactly as it did␊
211// before. Multiboot does its own runtime initialization, does some of its␊
212// own things, and then calls common_boot.␊
213void boot(int biosdev)␊
214{␊
215␉initialize_runtime();␊
216␉// Enable A20 gate before accessing memory above 1Mb.␊
217␉enableA20();␊
218␉common_boot(biosdev);␊
219}␊
220␊
221//==========================================================================␊
222// The 'main' function for the booter. Called by boot0 when booting␊
223// from a block device, or by the network booter.␊
224//␊
225// arguments:␊
226// biosdev - Value passed from boot1/NBP to specify the device␊
227// that the booter was loaded from.␊
228//␊
229// If biosdev is kBIOSDevNetwork, then this function will return if␊
230// booting was unsuccessful. This allows the PXE firmware to try the␊
231// next boot device on its list.␊
232void common_boot(int biosdev)␊
233{␊
234 int status;␊
235 char *bootFile;␊
236 unsigned long adler32;␊
237 bool quiet;␊
238 bool firstRun = true;␊
239 bool instantMenu;␊
240 bool rescanPrompt;␊
241 unsigned int allowBVFlags = kBVFlagSystemVolume|kBVFlagForeignBoot;␊
242 unsigned int denyBVFlags = kBVFlagEFISystem;␊
243␊
244 // Set reminder to unload the PXE base code. Neglect to unload␊
245 // the base code will result in a hang or kernel panic.␊
246 gUnloadPXEOnExit = true;␊
247␊
248 // Record the device that the booter was loaded from.␊
249 gBIOSDev = biosdev & kBIOSDevMask;␊
250␊
251 // Initialize boot info structure.␊
252 initKernBootStruct();␊
253␊
254␉initBooterLog();␊
255␊
256 // Setup VGA text mode.␊
257 // Not sure if it is safe to call setVideoMode() before the␊
258 // config table has been loaded. Call video_mode() instead.␊
259#if DEBUG␊
260 printf("before video_mode\n");␊
261#endif␊
262 video_mode( 2 ); // 80x25 mono text mode.␊
263#if DEBUG␊
264 printf("after video_mode\n");␊
265#endif␊
266␊
267 // Scan and record the system's hardware information.␊
268 scan_platform();␊
269␊
270 // First get info for boot volume.␊
271 scanBootVolumes(gBIOSDev, 0);␊
272 bvChain = getBVChainForBIOSDev(gBIOSDev);␊
273 setBootGlobals(bvChain);␊
274 ␊
275 // Load boot.plist config file␊
276 status = loadSystemConfig(&bootInfo->bootConfig);␊
277␊
278 if (getBoolForKey(kQuietBootKey, &quiet, &bootInfo->bootConfig) && quiet) {␊
279 gBootMode |= kBootModeQuiet;␊
280 }␊
281␊
282 // Override firstRun to get to the boot menu instantly by setting "Instant Menu"=y in system config␊
283 if (getBoolForKey(kInsantMenuKey, &instantMenu, &bootInfo->bootConfig) && instantMenu) {␊
284 firstRun = false;␊
285 }␊
286␊
287 // Loading preboot ramdisk if exists.␊
288 loadPrebootRAMDisk();␊
289␊
290 // Disable rescan option by default␊
291 gEnableCDROMRescan = false;␊
292␊
293 // Enable it with Rescan=y in system config␊
294 if (getBoolForKey(kRescanKey, &gEnableCDROMRescan, &bootInfo->bootConfig) && gEnableCDROMRescan) {␊
295 gEnableCDROMRescan = true;␊
296 }␊
297␊
298 // Ask the user for Rescan option by setting "Rescan Prompt"=y in system config.␊
299 rescanPrompt = false;␊
300 if (getBoolForKey(kRescanPromptKey, &rescanPrompt , &bootInfo->bootConfig) && rescanPrompt && biosDevIsCDROM(gBIOSDev)) {␊
301 gEnableCDROMRescan = promptForRescanOption();␊
302 }␊
303␊
304 // Enable touching a single BIOS device only if "Scan Single Drive"=y is set in system config.␊
305 if (getBoolForKey(kScanSingleDriveKey, &gScanSingleDrive, &bootInfo->bootConfig) && gScanSingleDrive) {␊
306 gScanSingleDrive = true;␊
307 }␊
308␊
309 // Create a list of partitions on device(s).␊
310 if (gScanSingleDrive) {␊
311 scanBootVolumes(gBIOSDev, &bvCount);␊
312 } else {␊
313 scanDisks(gBIOSDev, &bvCount);␊
314 }␊
315␊
316 // Create a separated bvr chain using the specified filters.␊
317 bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
318␊
319 gBootVolume = selectBootVolume(bvChain);␊
320␊
321#if DEBUG␊
322 printf(" Default: %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBootVolume, gBootVolume->biosdev, gBootVolume->part_no, gBootVolume->flags);␊
323 printf(" bt(0,0): %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBIOSBootVolume, gBIOSBootVolume->biosdev, gBIOSBootVolume->part_no, gBIOSBootVolume->flags);␊
324 getc();␊
325#endif␊
326␊
327␉useGUI = true;␊
328␉// Override useGUI default␊
329␉getBoolForKey(kGUIKey, &useGUI, &bootInfo->bootConfig);␊
330␉if (useGUI && initGUI())␊
331␉{␊
332␉␉// initGUI() returned with an error, disabling GUI.␊
333␉␉useGUI = false;␊
334␉}␊
335␊
336 setBootGlobals(bvChain);␊
337␊
338 // Parse args, load and start kernel.␊
339 while (1) {␊
340 const char *val;␊
341 int len;␊
342 int trycache;␊
343 long flags, cachetime, kerneltime, exttime, sleeptime, time;␊
344 int ret = -1;␊
345 void *binary = (void *)kLoadAddr;␊
346 bool tryresume;␊
347 bool tryresumedefault;␊
348 bool forceresume;␊
349␊
350 // additional variable for testing alternate kernel image locations on boot helper partitions.␊
351 char bootFileSpec[512];␊
352␉␉␊
353 // Initialize globals.␊
354␊
355 sysConfigValid = false;␊
356 gErrors = false;␊
357␊
358 status = getBootOptions(firstRun);␊
359 firstRun = false;␊
360 if (status == -1) continue;␊
361␉␉ ␊
362 status = processBootOptions();␊
363 // Status==1 means to chainboot␊
364 if ( status == 1 ) break;␊
365 // Status==-1 means that the config file couldn't be loaded or that gBootVolume is NULL␊
366 if ( status == -1 )␊
367 {␊
368 // gBootVolume == NULL usually means the user hit escape.␊
369 if(gBootVolume == NULL)␊
370 {␊
371 freeFilteredBVChain(bvChain);␊
372␊
373 if (gEnableCDROMRescan)␊
374 rescanBIOSDevice(gBIOSDev);␊
375 ␊
376 bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
377 setBootGlobals(bvChain);␊
378 setupDeviceList(&bootInfo->themeConfig);␊
379 }␊
380 continue;␊
381 }␊
382␉␉␊
383 // Other status (e.g. 0) means that we should proceed with boot.␊
384␉␉␊
385␉␉// Turn off any GUI elements␊
386␉␉if( bootArgs->Video.v_display == GRAPHICS_MODE )␊
387␉␉{␊
388␉␉␉gui.devicelist.draw = false;␊
389␉␉␉gui.bootprompt.draw = false;␊
390␉␉␉gui.menu.draw = false;␊
391␉␉␉gui.infobox.draw = false;␊
392␉␉␉gui.logo.draw = false;␊
393␉␉␉drawBackground();␊
394␉␉␉updateVRAM();␊
395␉␉}␊
396␉␉␊
397␉␉// Find out which version mac os we're booting.␊
398␉␉getOSVersion(gMacOSVersion);␊
399␊
400␉␉if (platformCPUFeature(CPU_FEATURE_EM64T)) {␊
401␉␉␉archCpuType = CPU_TYPE_X86_64;␊
402␉␉} else {␊
403␉␉␉archCpuType = CPU_TYPE_I386;␊
404␉␉}␊
405␉␉if (getValueForKey(karch, &val, &len, &bootInfo->bootConfig)) {␊
406␉␉␉if (strncmp(val, "i386", 4) == 0) {␊
407␉␉␉␉archCpuType = CPU_TYPE_I386;␊
408␉␉␉}␊
409␉␉}␊
410␊
411␉␉if (!getBoolForKey (kWake, &tryresume, &bootInfo->bootConfig)) {␊
412␉␉␉tryresume = true;␊
413␉␉␉tryresumedefault = true;␊
414␉␉} else {␊
415␉␉␉tryresumedefault = false;␊
416␉␉}␊
417␊
418␉␉if (!getBoolForKey (kForceWake, &forceresume, &bootInfo->bootConfig)) {␊
419␉␉␉forceresume = false;␊
420␉␉}␊
421␉␉␊
422␉␉if (forceresume) {␊
423␉␉␉tryresume = true;␊
424␉␉␉tryresumedefault = false;␊
425␉␉}␊
426␉␉␊
427␉␉while (tryresume) {␊
428␉␉␉const char *tmp;␊
429␉␉␉BVRef bvr;␊
430␉␉␉if (!getValueForKey(kWakeImage, &val, &len, &bootInfo->bootConfig))␊
431␉␉␉␉val="/private/var/vm/sleepimage";␊
432␉␉␉␊
433␉␉␉// Do this first to be sure that root volume is mounted␊
434␉␉␉ret = GetFileInfo(0, val, &flags, &sleeptime);␊
435␊
436␉␉␉if ((bvr = getBootVolumeRef(val, &tmp)) == NULL)␊
437␉␉␉␉break;␊
438␉␉␉␊
439␉␉␉// Can't check if it was hibernation Wake=y is required␊
440␉␉␉if (bvr->modTime == 0 && tryresumedefault)␊
441␉␉␉␉break;␊
442␉␉␉␊
443␉␉␉if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat))␊
444␉␉␉␉break;␊
445␉␉␉␊
446␉␉␉if (!forceresume && ((sleeptime+3)<bvr->modTime)) {␊
447␉␉␉␉printf ("Hibernate image is too old by %d seconds. Use ForceWake=y to override\n",bvr->modTime-sleeptime);␊
448␉␉␉␉break;␊
449␉␉␉}␊
450␉␉␉␉␊
451␉␉␉HibernateBoot((char *)val);␊
452␉␉␉break;␊
453␉␉}␊
454␊
455 // Reset cache name.␊
456 bzero(gCacheNameAdler + 64, sizeof(gCacheNameAdler) - 64);␊
457␊
458 sprintf(gCacheNameAdler + 64, "%s,%s", gRootDevice, bootInfo->bootFile);␊
459␊
460 adler32 = Adler32((unsigned char *)gCacheNameAdler, sizeof(gCacheNameAdler));␊
461␊
462 if (getValueForKey(kKernelCacheKey, &val, &len, &bootInfo->bootConfig)) {␊
463 strlcpy(gBootKernelCacheFile, val, len+1);␊
464 } else {␊
465 sprintf(gBootKernelCacheFile, "%s.%08lX", kDefaultCachePath, adler32);␊
466 }␊
467␊
468 // Check for cache file.␊
469 trycache = (((gBootMode & kBootModeSafe) == 0) &&␊
470 !gOverrideKernel &&␊
471 (gBootFileType == kBlockDeviceType) &&␊
472 (gMKextName[0] == '\0') &&␊
473 (gBootKernelCacheFile[0] != '\0'));␊
474␊
475␉␉verbose("Loading Darwin %s\n", gMacOSVersion);␊
476␉␉␊
477 if (trycache) do {␊
478 ␊
479 // if we haven't found the kernel yet, don't use the cache␊
480 ret = GetFileInfo(NULL, bootInfo->bootFile, &flags, &kerneltime);␊
481 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)) {␊
482 trycache = 0;␊
483 break;␊
484 }␊
485 ret = GetFileInfo(NULL, gBootKernelCacheFile, &flags, &cachetime);␊
486 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)␊
487 || (cachetime < kerneltime)) {␊
488 trycache = 0;␊
489 break;␊
490 }␊
491 ret = GetFileInfo("/System/Library/", "Extensions", &flags, &exttime);␊
492 if ((ret == 0) && ((flags & kFileTypeMask) == kFileTypeDirectory)␊
493 && (cachetime < exttime)) {␊
494 trycache = 0;␊
495 break;␊
496 }␊
497 if (kerneltime > exttime) {␊
498 exttime = kerneltime;␊
499 }␊
500 if (cachetime != (exttime + 1)) {␊
501 trycache = 0;␊
502 break;␊
503 }␊
504 } while (0);␊
505␊
506 do {␊
507 if (trycache) {␊
508 bootFile = gBootKernelCacheFile;␊
509 verbose("Loading kernel cache %s\n", bootFile);␊
510 ret = LoadFile(bootFile);␊
511 binary = (void *)kLoadAddr;␊
512 if (ret >= 0) {␊
513 break;␊
514 }␊
515 }␊
516 bootFile = bootInfo->bootFile;␊
517␊
518 // Try to load kernel image from alternate locations on boot helper partitions.␊
519 sprintf(bootFileSpec, "com.apple.boot.P/%s", bootFile);␊
520 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
521 ␉ ␉ if (ret == -1)␊
522 ␉ ␉ {␊
523 sprintf(bootFileSpec, "com.apple.boot.R/%s", bootFile);␊
524 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
525 if (ret == -1)␊
526 {␊
527 sprintf(bootFileSpec, "com.apple.boot.S/%s", bootFile);␊
528 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
529 if (ret == -1)␊
530 {␊
531 // Not found any alternate locations, using the original kernel image path.␊
532 strcpy(bootFileSpec, bootFile);␊
533 }␊
534 }␊
535 }␊
536 ␉␉␉␊
537 verbose("Loading kernel %s\n", bootFileSpec);␊
538 ret = LoadThinFatFile(bootFileSpec, &binary);␊
539 if (ret <= 0 && archCpuType == CPU_TYPE_X86_64)␊
540 {␊
541 archCpuType = CPU_TYPE_I386;␊
542 ret = LoadThinFatFile(bootFileSpec, &binary);␉␉␉␉␊
543 }␊
544␉␉␉␊
545 } while (0);␊
546␊
547 clearActivityIndicator();␊
548#if DEBUG␊
549 printf("Pausing...");␊
550 sleep(8);␊
551#endif␊
552␊
553 if (ret <= 0) {␊
554␉␉␉printf("Can't find %s\n", bootFile);␊
555␊
556␉␉␉sleep(1);␊
557␊
558 if (gBootFileType == kNetworkDeviceType) {␊
559 // Return control back to PXE. Don't unload PXE base code.␊
560 gUnloadPXEOnExit = false;␊
561 break;␊
562 }␊
563 } else {␊
564 /* Won't return if successful. */␊
565 ret = ExecKernel(binary);␊
566 }␊
567 }␊
568 ␊
569 // chainboot␊
570 if (status==1) {␊
571␉if (getVideoMode() == GRAPHICS_MODE) {␉// if we are already in graphics-mode,␊
572␉␉setVideoMode(VGA_TEXT_MODE, 0);␉// switch back to text mode␊
573␉}␊
574 }␊
575␉␊
576 if ((gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit) {␊
577␉nbpUnloadBaseCode();␊
578 }␊
579}␊
580␊
581/*!␊
582 Selects a new BIOS device, taking care to update the global state appropriately.␊
583 */␊
584/*␊
585static void selectBiosDevice(void)␊
586{␊
587 struct DiskBVMap *oldMap = diskResetBootVolumes(gBIOSDev);␊
588 CacheReset();␊
589 diskFreeMap(oldMap);␊
590 oldMap = NULL;␊
591␊
592 int dev = selectAlternateBootDevice(gBIOSDev);␊
593␊
594 BVRef bvchain = scanBootVolumes(dev, 0);␊
595 BVRef bootVol = selectBootVolume(bvchain);␊
596 gBootVolume = bootVol;␊
597 setRootVolume(bootVol);␊
598 gBIOSDev = dev;␊
599}␊
600*/␊
601␊
602static bool getOSVersion(char *str)␊
603{␊
604␉bool valid = false;␊
605␉config_file_t systemVersion;␊
606␉const char *val;␊
607␉int len;␊
608␊
609␉if (!loadConfigFile("System/Library/CoreServices/SystemVersion.plist", &systemVersion))␊
610␉{␊
611␉␉valid = true;␊
612␉}␊
613␉else if (!loadConfigFile("System/Library/CoreServices/ServerVersion.plist", &systemVersion))␊
614␉{␊
615␉␉valid = true;␊
616␉}␊
617␊
618␉if (valid)␊
619␉{␊
620␉␉if (getValueForKey(kProductVersion, &val, &len, &systemVersion))␊
621␉␉{␊
622␉␉␉// getValueForKey uses const char for val␊
623␉␉␉// so copy it and trim␊
624␉␉␉*str = '\0';␊
625␉␉␉strncat(str, val, MIN(len, 4));␊
626␉␉}␊
627␉␉else␊
628␉␉␉valid = false;␊
629␉}␊
630␊
631␉return valid;␊
632}␊
633␊
634#define BASE 65521L /* largest prime smaller than 65536 */␊
635#define NMAX 5000␊
636// NMAX (was 5521) the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1␊
637␊
638#define DO1(buf,i) {s1 += buf[i]; s2 += s1;}␊
639#define DO2(buf,i) DO1(buf,i); DO1(buf,i+1);␊
640#define DO4(buf,i) DO2(buf,i); DO2(buf,i+2);␊
641#define DO8(buf,i) DO4(buf,i); DO4(buf,i+4);␊
642#define DO16(buf) DO8(buf,0); DO8(buf,8);␊
643␊
644unsigned long Adler32(unsigned char *buf, long len)␊
645{␊
646 unsigned long s1 = 1; // adler & 0xffff;␊
647 unsigned long s2 = 0; // (adler >> 16) & 0xffff;␊
648 unsigned long result;␊
649 int k;␊
650␊
651 while (len > 0) {␊
652 k = len < NMAX ? len : NMAX;␊
653 len -= k;␊
654 while (k >= 16) {␊
655 DO16(buf);␊
656 buf += 16;␊
657 k -= 16;␊
658 }␊
659 if (k != 0) do {␊
660 s1 += *buf++;␊
661 s2 += s1;␊
662 } while (--k);␊
663 s1 %= BASE;␊
664 s2 %= BASE;␊
665 }␊
666 result = (s2 << 16) | s1;␊
667 return OSSwapHostToBigInt32(result);␊
668}␊
669

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