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

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