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Source at commit 505 created 13 years 7 months ago.
By meklort, Sync with trunk, untested
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#include "resolution.h"␊
62#include "modules.h"␊
63␊
64long gBootMode; /* defaults to 0 == kBootModeNormal */␊
65bool gOverrideKernel;␊
66static char gBootKernelCacheFile[512];␊
67static char gCacheNameAdler[64 + 256];␊
68char *gPlatformName = gCacheNameAdler;␊
69char gRootDevice[512];␊
70char gMKextName[512];␊
71char gMacOSVersion[8];␊
72bool gEnableCDROMRescan;␊
73bool gScanSingleDrive;␊
74␊
75int bvCount = 0;␊
76//int␉menucount = 0;␊
77int gDeviceCount = 0; ␊
78␊
79bool␉recoveryMode = false;␊
80␊
81BVRef bvr;␊
82BVRef menuBVR;␊
83BVRef bvChain;␊
84bool useGUI;␊
85␊
86//static void selectBiosDevice(void);␊
87static unsigned long Adler32(unsigned char *buffer, long length);␊
88static bool getOSVersion(char *str);␊
89␊
90static bool gUnloadPXEOnExit = false;␊
91␊
92/*␊
93 * How long to wait (in seconds) to load the␊
94 * kernel after displaying the "boot:" prompt.␊
95 */␊
96#define kBootErrorTimeout 5␊
97␊
98/*␊
99 * Default path to kernel cache file␊
100 */␊
101#define kDefaultCachePath "/System/Library/Caches/com.apple.kernelcaches/kernelcache"␊
102␊
103//==========================================================================␊
104// Zero the BSS.␊
105␊
106static void zeroBSS(void)␊
107{␊
108␉extern char _DATA__bss__begin, _DATA__bss__end;␊
109␉extern char _DATA__common__begin, _DATA__common__end;␊
110␊
111␉bzero(&_DATA__bss__begin, (&_DATA__bss__end - &_DATA__bss__begin));␊
112␉bzero(&_DATA__common__begin, (&_DATA__common__end - &_DATA__common__begin));␊
113}␊
114␊
115//==========================================================================␊
116// Malloc error function␊
117␊
118static void malloc_error(char *addr, size_t size, const char *file, int line)␊
119{␊
120␉stop("\nMemory allocation error! Addr=0x%x, Size=0x%x, File=%s, Line=%d\n", (unsigned)addr, (unsigned)size, file, line);␊
121}␊
122␊
123//==========================================================================␊
124//Initializes the runtime. Right now this means zeroing the BSS and initializing malloc.␊
125//␊
126void initialize_runtime(void)␊
127{␊
128␉zeroBSS();␊
129␉malloc_init(0, 0, 0, malloc_error);␊
130}␊
131␊
132//==========================================================================␊
133// execKernel - Load the kernel image (mach-o) and jump to its entry point.␊
134␊
135static int ExecKernel(void *binary)␊
136{␊
137 entry_t kernelEntry;␊
138 int ret;␊
139␊
140 bootArgs->kaddr = bootArgs->ksize = 0;␊
141␊
142 ret = DecodeKernel(binary,␊
143 &kernelEntry,␊
144 (char **) &bootArgs->kaddr,␊
145 (int *)&bootArgs->ksize );␊
146␊
147 if ( ret != 0 )␊
148 return ret;␊
149␊
150 // Reserve space for boot args␊
151 reserveKernBootStruct();␊
152␊
153 // Load boot drivers from the specifed root path.␊
154␊
155 if (!gHaveKernelCache) {␊
156 LoadDrivers("/");␊
157 }␊
158␊
159 clearActivityIndicator();␊
160␊
161 if (gErrors) {␊
162 printf("Errors encountered while starting up the computer.\n");␊
163 printf("Pausing %d seconds...\n", kBootErrorTimeout);␊
164 sleep(kBootErrorTimeout);␊
165 }␊
166␊
167␉md0Ramdisk();␊
168␉␊
169 setupFakeEfi();␊
170␊
171 md0Ramdisk();␊
172␊
173 verbose("Starting Darwin %s\n",( archCpuType == CPU_TYPE_I386 ) ? "x86" : "x86_64");␊
174␊
175 // Cleanup the PXE base code.␊
176␊
177 if ( (gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit ) {␊
178␉␉if ( (ret = nbpUnloadBaseCode()) != nbpStatusSuccess )␊
179 {␊
180 ␉printf("nbpUnloadBaseCode error %d\n", (int) ret);␊
181 sleep(2);␊
182 }␊
183 }␊
184␊
185 bool dummyVal;␊
186␉if (getBoolForKey(kWaitForKeypressKey, &dummyVal, &bootInfo->bootConfig) && dummyVal) {␊
187␉␉printf("Press any key to continue...");␊
188␉␉getc();␊
189␉}␊
190␊
191␉usb_loop();␊
192␊
193 // If we were in text mode, switch to graphics mode.␊
194 // This will draw the boot graphics unless we are in␊
195 // verbose mode.␊
196␊
197 if(gVerboseMode)␊
198 setVideoMode( GRAPHICS_MODE, 0 );␊
199 else␊
200 drawBootGraphics();␊
201␉␊
202␉setupBooterLog();␊
203␉␊
204 finalizeBootStruct();␊
205 ␊
206␉usb_loop();␊
207␉␊
208␉execute_hook("Kernel Start", (void*)kernelEntry, (void*)bootArgs, NULL, NULL);␉// Notify modules that the kernel is about to be started␊
209␊
210␉// Jump to kernel's entry point. There's no going back now.␊
211 startprog( kernelEntry, bootArgs );␊
212␊
213 // Not reached␊
214␊
215 return 0;␊
216}␊
217␊
218//==========================================================================␊
219// This is the entrypoint from real-mode which functions exactly as it did␊
220// before. Multiboot does its own runtime initialization, does some of its␊
221// own things, and then calls common_boot.␊
222void boot(int biosdev)␊
223{␊
224␉initialize_runtime();␊
225␉// Enable A20 gate before accessing memory above 1Mb.␊
226␉enableA20();␊
227␉common_boot(biosdev);␊
228}␊
229␊
230//==========================================================================␊
231// The 'main' function for the booter. Called by boot0 when booting␊
232// from a block device, or by the network booter.␊
233//␊
234// arguments:␊
235// biosdev - Value passed from boot1/NBP to specify the device␊
236// that the booter was loaded from.␊
237//␊
238// If biosdev is kBIOSDevNetwork, then this function will return if␊
239// booting was unsuccessful. This allows the PXE firmware to try the␊
240// next boot device on its list.␊
241void common_boot(int biosdev)␊
242{␊
243 int status;␊
244 char *bootFile;␊
245 unsigned long adler32;␊
246 bool quiet;␊
247 bool firstRun = true;␊
248 bool instantMenu;␊
249 bool rescanPrompt;␊
250 unsigned int allowBVFlags = kBVFlagSystemVolume|kBVFlagForeignBoot;␊
251 unsigned int denyBVFlags = kBVFlagEFISystem;␊
252␊
253 // Set reminder to unload the PXE base code. Neglect to unload␊
254 // the base code will result in a hang or kernel panic.␊
255 gUnloadPXEOnExit = true;␊
256␊
257 // Record the device that the booter was loaded from.␊
258 gBIOSDev = biosdev & kBIOSDevMask;␊
259␊
260 // Initialize boot info structure.␊
261 initKernBootStruct();␊
262␊
263␉initBooterLog();␊
264␊
265 // Setup VGA text mode.␊
266 // Not sure if it is safe to call setVideoMode() before the␊
267 // config table has been loaded. Call video_mode() instead.␊
268#if DEBUG␊
269 printf("before video_mode\n");␊
270#endif␊
271 video_mode( 2 ); // 80x25 mono text mode.␊
272#if DEBUG␊
273 printf("after video_mode\n");␊
274#endif␊
275␊
276 // Scan and record the system's hardware information.␊
277 scan_platform();␊
278␊
279 // First get info for boot volume.␊
280 scanBootVolumes(gBIOSDev, 0);␊
281 bvChain = getBVChainForBIOSDev(gBIOSDev);␊
282 setBootGlobals(bvChain);␊
283 ␊
284 // Load boot.plist config file␊
285 status = loadSystemConfig(&bootInfo->bootConfig);␊
286␊
287 if (getBoolForKey(kQuietBootKey, &quiet, &bootInfo->bootConfig) && quiet) {␊
288 gBootMode |= kBootModeQuiet;␊
289 }␊
290␊
291 // Override firstRun to get to the boot menu instantly by setting "Instant Menu"=y in system config␊
292 if (getBoolForKey(kInsantMenuKey, &instantMenu, &bootInfo->bootConfig) && instantMenu) {␊
293 firstRun = false;␊
294 }␊
295␊
296␉// Intialize module system␊
297␉if(init_module_system())␊
298␉{␊
299␉␉load_all_modules();␊
300␉}␊
301␉␊
302␉␊
303␉␊
304 // Loading preboot ramdisk if exists.␊
305 loadPrebootRAMDisk();␊
306␉␉␊
307 // Disable rescan option by default␊
308 gEnableCDROMRescan = false;␊
309␊
310 // Enable it with Rescan=y in system config␊
311 if (getBoolForKey(kRescanKey, &gEnableCDROMRescan, &bootInfo->bootConfig) && gEnableCDROMRescan) {␊
312 gEnableCDROMRescan = true;␊
313 }␊
314␊
315 // Ask the user for Rescan option by setting "Rescan Prompt"=y in system config.␊
316 rescanPrompt = false;␊
317 if (getBoolForKey(kRescanPromptKey, &rescanPrompt , &bootInfo->bootConfig) && rescanPrompt && biosDevIsCDROM(gBIOSDev)) {␊
318 gEnableCDROMRescan = promptForRescanOption();␊
319 }␊
320␊
321 // Enable touching a single BIOS device only if "Scan Single Drive"=y is set in system config.␊
322 if (getBoolForKey(kScanSingleDriveKey, &gScanSingleDrive, &bootInfo->bootConfig) && gScanSingleDrive) {␊
323 gScanSingleDrive = true;␊
324 }␊
325␊
326 // Create a list of partitions on device(s).␊
327 if (gScanSingleDrive) {␊
328 scanBootVolumes(gBIOSDev, &bvCount);␊
329 } else {␊
330 scanDisks(gBIOSDev, &bvCount);␊
331 }␊
332␊
333 // Create a separated bvr chain using the specified filters.␊
334 bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
335␊
336 gBootVolume = selectBootVolume(bvChain);␊
337␊
338#if DEBUG␊
339 printf(" Default: %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBootVolume, gBootVolume->biosdev, gBootVolume->part_no, gBootVolume->flags);␊
340 printf(" bt(0,0): %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBIOSBootVolume, gBIOSBootVolume->biosdev, gBIOSBootVolume->part_no, gBIOSBootVolume->flags);␊
341 getc();␊
342#endif␊
343␊
344␉useGUI = true;␊
345␉// Override useGUI default␊
346␉getBoolForKey(kGUIKey, &useGUI, &bootInfo->bootConfig);␊
347␉if (useGUI && initGUI())␊
348␉{␊
349␉␉// initGUI() returned with an error, disabling GUI.␊
350␉␉useGUI = false;␊
351␉}␊
352␊
353 setBootGlobals(bvChain);␊
354␊
355 // Parse args, load and start kernel.␊
356 while (1) {␊
357 const char *val;␊
358 int len;␊
359 int trycache;␊
360 long flags, cachetime, kerneltime, exttime, sleeptime, time;␊
361 int ret = -1;␊
362 void *binary = (void *)kLoadAddr;␊
363 bool tryresume;␊
364 bool tryresumedefault;␊
365 bool forceresume;␊
366␊
367 // additional variable for testing alternate kernel image locations on boot helper partitions.␊
368 char bootFileSpec[512];␊
369␉␉␊
370 // Initialize globals.␊
371␊
372 sysConfigValid = false;␊
373 gErrors = false;␊
374␊
375 status = getBootOptions(firstRun);␊
376 firstRun = false;␊
377 if (status == -1) continue;␊
378␉␉ ␊
379 status = processBootOptions();␊
380 // Status==1 means to chainboot␊
381 if ( status == 1 ) break;␊
382 // Status==-1 means that the config file couldn't be loaded or that gBootVolume is NULL␊
383 if ( status == -1 )␊
384 {␊
385 // gBootVolume == NULL usually means the user hit escape.␊
386 if(gBootVolume == NULL)␊
387 {␊
388 freeFilteredBVChain(bvChain);␊
389␊
390 if (gEnableCDROMRescan)␊
391 rescanBIOSDevice(gBIOSDev);␊
392 ␊
393 bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
394 setBootGlobals(bvChain);␊
395 setupDeviceList(&bootInfo->themeConfig);␊
396 }␊
397 continue;␊
398 }␊
399␉␉␊
400 // Other status (e.g. 0) means that we should proceed with boot.␊
401␉␉␊
402␉␉// Turn off any GUI elements␊
403␉␉if( bootArgs->Video.v_display == GRAPHICS_MODE )␊
404␉␉{␊
405␉␉␉gui.devicelist.draw = false;␊
406␉␉␉gui.bootprompt.draw = false;␊
407␉␉␉gui.menu.draw = false;␊
408␉␉␉gui.infobox.draw = false;␊
409␉␉␉gui.logo.draw = false;␊
410␉␉␉drawBackground();␊
411␉␉␉updateVRAM();␊
412␉␉}␊
413␉␉␊
414␉␉// Find out which version mac os we're booting.␊
415␉␉getOSVersion(gMacOSVersion);␊
416␊
417␉␉if (platformCPUFeature(CPU_FEATURE_EM64T)) {␊
418␉␉␉archCpuType = CPU_TYPE_X86_64;␊
419␉␉} else {␊
420␉␉␉archCpuType = CPU_TYPE_I386;␊
421␉␉}␊
422␉␉if (getValueForKey(karch, &val, &len, &bootInfo->bootConfig)) {␊
423␉␉␉if (strncmp(val, "i386", 4) == 0) {␊
424␉␉␉␉archCpuType = CPU_TYPE_I386;␊
425␉␉␉}␊
426␉␉}␊
427␊
428␉␉if (!getBoolForKey (kWake, &tryresume, &bootInfo->bootConfig)) {␊
429␉␉␉tryresume = true;␊
430␉␉␉tryresumedefault = true;␊
431␉␉} else {␊
432␉␉␉tryresumedefault = false;␊
433␉␉}␊
434␊
435␉␉if (!getBoolForKey (kForceWake, &forceresume, &bootInfo->bootConfig)) {␊
436␉␉␉forceresume = false;␊
437␉␉}␊
438␉␉␊
439␉␉if (forceresume) {␊
440␉␉␉tryresume = true;␊
441␉␉␉tryresumedefault = false;␊
442␉␉}␊
443␉␉␊
444␉␉while (tryresume) {␊
445␉␉␉const char *tmp;␊
446␉␉␉BVRef bvr;␊
447␉␉␉if (!getValueForKey(kWakeImage, &val, &len, &bootInfo->bootConfig))␊
448␉␉␉␉val="/private/var/vm/sleepimage";␊
449␉␉␉␊
450␉␉␉// Do this first to be sure that root volume is mounted␊
451␉␉␉ret = GetFileInfo(0, val, &flags, &sleeptime);␊
452␊
453␉␉␉if ((bvr = getBootVolumeRef(val, &tmp)) == NULL)␊
454␉␉␉␉break;␊
455␉␉␉␊
456␉␉␉// Can't check if it was hibernation Wake=y is required␊
457␉␉␉if (bvr->modTime == 0 && tryresumedefault)␊
458␉␉␉␉break;␊
459␉␉␉␊
460␉␉␉if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat))␊
461␉␉␉␉break;␊
462␉␉␉␊
463␉␉␉if (!forceresume && ((sleeptime+3)<bvr->modTime)) {␊
464␉␉␉␉printf ("Hibernate image is too old by %d seconds. Use ForceWake=y to override\n",bvr->modTime-sleeptime);␊
465␉␉␉␉break;␊
466␉␉␉}␊
467␉␉␉␉␊
468␉␉␉HibernateBoot((char *)val);␊
469␉␉␉break;␊
470␉␉}␊
471␊
472 // Reset cache name.␊
473 bzero(gCacheNameAdler + 64, sizeof(gCacheNameAdler) - 64);␊
474␊
475 sprintf(gCacheNameAdler + 64, "%s,%s", gRootDevice, bootInfo->bootFile);␊
476␊
477 adler32 = Adler32((unsigned char *)gCacheNameAdler, sizeof(gCacheNameAdler));␊
478␊
479 if (getValueForKey(kKernelCacheKey, &val, &len, &bootInfo->bootConfig)) {␊
480 strlcpy(gBootKernelCacheFile, val, len+1);␊
481 } else {␊
482 sprintf(gBootKernelCacheFile, "%s.%08lX", kDefaultCachePath, adler32);␊
483 }␊
484␊
485 // Check for cache file.␊
486 trycache = (((gBootMode & kBootModeSafe) == 0) &&␊
487 !gOverrideKernel &&␊
488 (gBootFileType == kBlockDeviceType) &&␊
489 (gMKextName[0] == '\0') &&␊
490 (gBootKernelCacheFile[0] != '\0'));␊
491␊
492␉␉verbose("Loading Darwin %s\n", gMacOSVersion);␊
493␉␉␊
494 if (trycache) do {␊
495 ␊
496 // if we haven't found the kernel yet, don't use the cache␊
497 ret = GetFileInfo(NULL, bootInfo->bootFile, &flags, &kerneltime);␊
498 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)) {␊
499 trycache = 0;␊
500 break;␊
501 }␊
502 ret = GetFileInfo(NULL, gBootKernelCacheFile, &flags, &cachetime);␊
503 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)␊
504 || (cachetime < kerneltime)) {␊
505 trycache = 0;␊
506 break;␊
507 }␊
508 ret = GetFileInfo("/System/Library/", "Extensions", &flags, &exttime);␊
509 if ((ret == 0) && ((flags & kFileTypeMask) == kFileTypeDirectory)␊
510 && (cachetime < exttime)) {␊
511 trycache = 0;␊
512 break;␊
513 }␊
514 if (kerneltime > exttime) {␊
515 exttime = kerneltime;␊
516 }␊
517 if (cachetime != (exttime + 1)) {␊
518 trycache = 0;␊
519 break;␊
520 }␊
521 } while (0);␊
522␊
523 do {␊
524 if (trycache) {␊
525 bootFile = gBootKernelCacheFile;␊
526 verbose("Loading kernel cache %s\n", bootFile);␊
527 ret = LoadFile(bootFile);␊
528 binary = (void *)kLoadAddr;␊
529 if (ret >= 0) {␊
530 break;␊
531 }␊
532 }␊
533 bootFile = bootInfo->bootFile;␊
534␊
535 // Try to load kernel image from alternate locations on boot helper partitions.␊
536 sprintf(bootFileSpec, "com.apple.boot.P/%s", bootFile);␊
537 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
538 ␉ ␉ if (ret == -1)␊
539 ␉ ␉ {␊
540 sprintf(bootFileSpec, "com.apple.boot.R/%s", bootFile);␊
541 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
542 if (ret == -1)␊
543 {␊
544 sprintf(bootFileSpec, "com.apple.boot.S/%s", bootFile);␊
545 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
546 if (ret == -1)␊
547 {␊
548 // Not found any alternate locations, using the original kernel image path.␊
549 strcpy(bootFileSpec, bootFile);␊
550 }␊
551 }␊
552 }␊
553 ␉␉␉␊
554 verbose("Loading kernel %s\n", bootFileSpec);␊
555 ret = LoadThinFatFile(bootFileSpec, &binary);␊
556 if (ret <= 0 && archCpuType == CPU_TYPE_X86_64)␊
557 {␊
558 archCpuType = CPU_TYPE_I386;␊
559 ret = LoadThinFatFile(bootFileSpec, &binary);␉␉␉␉␊
560 }␊
561␉␉␉␊
562 } while (0);␊
563␊
564 clearActivityIndicator();␊
565#if DEBUG␊
566 printf("Pausing...");␊
567 sleep(8);␊
568#endif␊
569␊
570 if (ret <= 0) {␊
571␉␉␉printf("Can't find %s\n", bootFile);␊
572␊
573␉␉␉sleep(1);␊
574␊
575 if (gBootFileType == kNetworkDeviceType) {␊
576 // Return control back to PXE. Don't unload PXE base code.␊
577 gUnloadPXEOnExit = false;␊
578 break;␊
579 }␊
580 } else {␊
581 /* Won't return if successful. */␊
582␉␉␉// Notify modules that ExecKernel is about to be called␊
583␉␉␉execute_hook("ExecKernel", binary, NULL, NULL, NULL);␊
584 ret = ExecKernel(binary);␊
585 }␊
586 }␊
587 ␊
588 // chainboot␊
589 if (status==1) {␊
590␉if (getVideoMode() == GRAPHICS_MODE) {␉// if we are already in graphics-mode,␊
591␉␉setVideoMode(VGA_TEXT_MODE, 0);␉// switch back to text mode␊
592␉}␊
593 }␊
594␉␊
595 if ((gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit) {␊
596␉nbpUnloadBaseCode();␊
597 }␊
598}␊
599␊
600/*!␊
601 Selects a new BIOS device, taking care to update the global state appropriately.␊
602 */␊
603/*␊
604static void selectBiosDevice(void)␊
605{␊
606 struct DiskBVMap *oldMap = diskResetBootVolumes(gBIOSDev);␊
607 CacheReset();␊
608 diskFreeMap(oldMap);␊
609 oldMap = NULL;␊
610␊
611 int dev = selectAlternateBootDevice(gBIOSDev);␊
612␊
613 BVRef bvchain = scanBootVolumes(dev, 0);␊
614 BVRef bootVol = selectBootVolume(bvchain);␊
615 gBootVolume = bootVol;␊
616 setRootVolume(bootVol);␊
617 gBIOSDev = dev;␊
618}␊
619*/␊
620␊
621static bool getOSVersion(char *str)␊
622{␊
623␉bool valid = false;␊
624␉config_file_t systemVersion;␊
625␉const char *val;␊
626␉int len;␊
627␊
628␉if (!loadConfigFile("System/Library/CoreServices/SystemVersion.plist", &systemVersion))␊
629␉{␊
630␉␉valid = true;␊
631␉}␊
632␉else if (!loadConfigFile("System/Library/CoreServices/ServerVersion.plist", &systemVersion))␊
633␉{␊
634␉␉valid = true;␊
635␉}␊
636␊
637␉if (valid)␊
638␉{␊
639␉␉if (getValueForKey(kProductVersion, &val, &len, &systemVersion))␊
640␉␉{␊
641␉␉␉// getValueForKey uses const char for val␊
642␉␉␉// so copy it and trim␊
643␉␉␉*str = '\0';␊
644␉␉␉strncat(str, val, MIN(len, 4));␊
645␉␉}␊
646␉␉else␊
647␉␉␉valid = false;␊
648␉}␊
649␊
650␉return valid;␊
651}␊
652␊
653#define BASE 65521L /* largest prime smaller than 65536 */␊
654#define NMAX 5000␊
655// NMAX (was 5521) the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1␊
656␊
657#define DO1(buf,i) {s1 += buf[i]; s2 += s1;}␊
658#define DO2(buf,i) DO1(buf,i); DO1(buf,i+1);␊
659#define DO4(buf,i) DO2(buf,i); DO2(buf,i+2);␊
660#define DO8(buf,i) DO4(buf,i); DO4(buf,i+4);␊
661#define DO16(buf) DO8(buf,0); DO8(buf,8);␊
662␊
663unsigned long Adler32(unsigned char *buf, long len)␊
664{␊
665 unsigned long s1 = 1; // adler & 0xffff;␊
666 unsigned long s2 = 0; // (adler >> 16) & 0xffff;␊
667 unsigned long result;␊
668 int k;␊
669␊
670 while (len > 0) {␊
671 k = len < NMAX ? len : NMAX;␊
672 len -= k;␊
673 while (k >= 16) {␊
674 DO16(buf);␊
675 buf += 16;␊
676 k -= 16;␊
677 }␊
678 if (k != 0) do {␊
679 s1 += *buf++;␊
680 s2 += s1;␊
681 } while (--k);␊
682 s1 %= BASE;␊
683 s2 %= BASE;␊
684 }␊
685 result = (s2 << 16) | s1;␊
686 return OSSwapHostToBigInt32(result);␊
687}␊
688

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