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Source at commit 635 created 13 years 5 months ago.
By meklort, Add module hooks. Change resume code to use verbose and not printf
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 "graphics.h"␊
61␊
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];␊
72#ifndef OPTION_ROM␊
73bool gEnableCDROMRescan;␊
74bool gScanSingleDrive;␊
75#endif␊
76␊
77␊
78int bvCount = 0;␊
79//int␉menucount = 0;␊
80int gDeviceCount = 0; ␊
81␊
82BVRef bvr;␊
83BVRef menuBVR;␊
84BVRef bvChain;␊
85␊
86//static void selectBiosDevice(void);␊
87static unsigned long Adler32(unsigned char *buffer, long length);␊
88static bool getOSVersion(char *str);␊
89␊
90#ifndef OPTION_ROM␊
91static bool gUnloadPXEOnExit = false;␊
92#endif␊
93␊
94/*␊
95 * How long to wait (in seconds) to load the␊
96 * kernel after displaying the "boot:" prompt.␊
97 */␊
98#define kBootErrorTimeout 5␊
99␊
100/*␊
101 * Default path to kernel cache file␊
102 */␊
103#define kDefaultCachePath "/System/Library/Caches/com.apple.kernelcaches/kernelcache"␊
104␊
105//==========================================================================␊
106// Zero the BSS.␊
107␊
108static void zeroBSS(void)␊
109{␊
110␉extern char _DATA__bss__begin, _DATA__bss__end;␊
111␉extern char _DATA__common__begin, _DATA__common__end;␊
112␉␊
113␉bzero(&_DATA__bss__begin, (&_DATA__bss__end - &_DATA__bss__begin));␊
114␉bzero(&_DATA__common__begin, (&_DATA__common__end - &_DATA__common__begin));␊
115}␊
116␊
117//==========================================================================␊
118// Malloc error function␊
119␊
120static void malloc_error(char *addr, size_t size, const char *file, int line)␊
121{␊
122␉stop("\nMemory allocation error! Addr=0x%x, Size=0x%x, File=%s, Line=%d\n", (unsigned)addr, (unsigned)size, file, line);␊
123}␊
124␊
125//==========================================================================␊
126//Initializes the runtime. Right now this means zeroing the BSS and initializing malloc.␊
127//␊
128void initialize_runtime(void)␊
129{␊
130␉zeroBSS();␊
131␉malloc_init(0, 0, 0, malloc_error);␊
132}␊
133␊
134//==========================================================================␊
135// execKernel - Load the kernel image (mach-o) and jump to its entry point.␊
136␊
137int ExecKernel(void *binary)␊
138{␊
139 entry_t kernelEntry;␊
140 int ret;␊
141␉␊
142 bootArgs->kaddr = bootArgs->ksize = 0;␊
143␉execute_hook("ExecKernel", (void*)binary, NULL, NULL, NULL);␊
144␊
145 ret = DecodeKernel(binary,␊
146 &kernelEntry,␊
147 (char **) &bootArgs->kaddr,␊
148 (int *)&bootArgs->ksize );␊
149␊
150 if ( ret != 0 )␊
151 return ret;␊
152 // Reserve space for boot args␊
153 reserveKernBootStruct();␊
154␉␊
155 // Load boot drivers from the specifed root path.␊
156␉execute_hook("DecodedKernel", (void*)binary, NULL, NULL, NULL);␊
157␊
158␉␊
159␉setupFakeEfi();␊
160␉␊
161 if (!gHaveKernelCache) {␊
162␉␉LoadDrivers("/");␊
163 }␊
164␉␊
165 clearActivityIndicator();␊
166␉␊
167 if (gErrors) {␊
168 printf("Errors encountered while starting up the computer.\n");␊
169 printf("Pausing %d seconds...\n", kBootErrorTimeout);␊
170 sleep(kBootErrorTimeout);␊
171 }␊
172␉␊
173␉md0Ramdisk();␊
174␉␊
175 verbose("Starting Darwin %s\n",( archCpuType == CPU_TYPE_I386 ) ? "x86" : "x86_64");␊
176#ifndef OPTION_ROM␊
177 // Cleanup the PXE base code.␊
178␉␊
179 if ( (gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit ) {␊
180␉␉if ( (ret = nbpUnloadBaseCode()) != nbpStatusSuccess )␊
181 {␊
182 ␉printf("nbpUnloadBaseCode error %d\n", (int) ret);␊
183 sleep(2);␊
184 }␊
185 }␊
186#endif ␊
187 bool dummyVal;␊
188␉if (getBoolForKey(kWaitForKeypressKey, &dummyVal, &bootInfo->bootConfig) && dummyVal)␊
189␉{␊
190␉␉printf("Press any key to continue...");␊
191␉␉getc();␊
192␉}␊
193␉␉␊
194␉if (bootArgs->Video.v_display == VGA_TEXT_MODE)␊
195␉{␊
196␉␉setVideoMode( GRAPHICS_MODE, 0 );␊
197␉␉// Draw gray screen. NOTE: no boot image, that's in the gui module␊
198#ifndef OPTION_ROM␊
199␉␉if(!gVerboseMode) drawColorRectangle(0, 0, DEFAULT_SCREEN_WIDTH, DEFAULT_SCREEN_HEIGHT, 0x01); ␊
200#endif␊
201␉}␊
202␊
203␉␊
204␉setupBooterLog();␊
205␉␊
206 finalizeBootStruct();␊
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#ifndef OPTION_ROM␊
250 bool rescanPrompt;␊
251#endif␊
252 unsigned int allowBVFlags = kBVFlagSystemVolume|kBVFlagForeignBoot;␊
253 unsigned int denyBVFlags = kBVFlagEFISystem;␊
254␉␊
255#ifndef OPTION_ROM␊
256 // Set reminder to unload the PXE base code. Neglect to unload␊
257 // the base code will result in a hang or kernel panic.␊
258 gUnloadPXEOnExit = true;␊
259#endif␊
260␉␊
261 // Record the device that the booter was loaded from.␊
262 gBIOSDev = biosdev & kBIOSDevMask;␊
263␉␊
264 // Initialize boot info structure.␊
265 initKernBootStruct();␊
266␉␊
267␉initBooterLog();␊
268␉␊
269 // Setup VGA text mode.␊
270 // Not sure if it is safe to call setVideoMode() before the␊
271 // config table has been loaded. Call video_mode() instead.␊
272#if DEBUG␊
273 printf("before video_mode\n");␊
274#endif␊
275 video_mode( 2 ); // 80x25 mono text mode.␊
276#if DEBUG␊
277 printf("after video_mode\n");␊
278#endif␊
279␉␊
280 // Scan and record the system's hardware information.␊
281 scan_platform();␊
282␉␊
283 // First get info for boot volume.␊
284 scanBootVolumes(gBIOSDev, 0);␊
285 bvChain = getBVChainForBIOSDev(gBIOSDev);␊
286 setBootGlobals(bvChain);␊
287␉␊
288 // Load boot.plist config file␊
289 status = loadSystemConfig(&bootInfo->bootConfig);␊
290␉␊
291 if (getBoolForKey(kQuietBootKey, &quiet, &bootInfo->bootConfig) && quiet) {␊
292 gBootMode |= kBootModeQuiet;␊
293 }␊
294␉␊
295 // Override firstRun to get to the boot menu instantly by setting "Instant Menu"=y in system config␊
296 if (getBoolForKey(kInsantMenuKey, &instantMenu, &bootInfo->bootConfig) && instantMenu) {␊
297 firstRun = false;␊
298 }␊
299␉␊
300#ifndef OPTION_ROM␊
301␉// Enable touching a single BIOS device only if "Scan Single Drive"=y is set in system config.␊
302 if (getBoolForKey(kScanSingleDriveKey, &gScanSingleDrive, &bootInfo->bootConfig) && gScanSingleDrive) {␊
303 gScanSingleDrive = true;␊
304 }␊
305␉␊
306␉// Create a list of partitions on device(s).␊
307 if (gScanSingleDrive)␊
308␉{␊
309␉␉scanBootVolumes(gBIOSDev, &bvCount);␊
310 } ␊
311␉else ␊
312#endif␊
313␉{␊
314␉␉scanDisks(gBIOSDev, &bvCount);␊
315 }␊
316␉␊
317␉// Create a separated bvr chain using the specified filters.␊
318 bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
319␉gBootVolume = selectBootVolume(bvChain);␊
320␉␊
321␉␊
322␉// Intialize module system␊
323␉if(init_module_system())␊
324␉{␊
325␉␉load_all_modules();␊
326␉}␊
327␉␊
328␉execute_hook("ModulesLoaded", NULL, NULL, NULL, NULL);␊
329␊
330␉␊
331#ifndef OPTION_ROM␊
332 // Loading preboot ramdisk if exists.␊
333 loadPrebootRAMDisk();␊
334␉␊
335 // Disable rescan option by default␊
336 gEnableCDROMRescan = false;␊
337␉␊
338 // Enable it with Rescan=y in system config␊
339 if (getBoolForKey(kRescanKey, &gEnableCDROMRescan, &bootInfo->bootConfig) && gEnableCDROMRescan) {␊
340 gEnableCDROMRescan = true;␊
341 }␊
342␉␊
343 // Ask the user for Rescan option by setting "Rescan Prompt"=y in system config.␊
344 rescanPrompt = false;␊
345 if (getBoolForKey(kRescanPromptKey, &rescanPrompt , &bootInfo->bootConfig) && rescanPrompt && biosDevIsCDROM(gBIOSDev)) {␊
346 gEnableCDROMRescan = promptForRescanOption();␊
347 }␊
348#endif␊
349␉␊
350␊
351␉␊
352␉␊
353#if DEBUG␊
354 printf(" Default: %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBootVolume, gBootVolume->biosdev, gBootVolume->part_no, gBootVolume->flags);␊
355 printf(" bt(0,0): %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBIOSBootVolume, gBIOSBootVolume->biosdev, gBIOSBootVolume->part_no, gBIOSBootVolume->flags);␊
356 getc();␊
357#endif␊
358␉␊
359␉␊
360␉␊
361 setBootGlobals(bvChain);␊
362␉␊
363 // Parse args, load and start kernel.␊
364 while (1) {␊
365 const char *val;␊
366 int len;␊
367 int trycache;␊
368 long flags, cachetime, kerneltime, exttime, sleeptime, time;␊
369 int ret = -1;␊
370 void *binary = (void *)kLoadAddr;␊
371 bool tryresume;␊
372 bool tryresumedefault;␊
373 bool forceresume;␊
374␉␉␊
375 // additional variable for testing alternate kernel image locations on boot helper partitions.␊
376 char bootFileSpec[512];␊
377␉␉␊
378 // Initialize globals.␊
379␉␉␊
380 sysConfigValid = false;␊
381 gErrors = false;␊
382␉␉␊
383 status = getBootOptions(firstRun);␊
384 firstRun = false;␊
385 if (status == -1) continue;␊
386␉␉␊
387 status = processBootOptions();␊
388 // Status==1 means to chainboot␊
389 if ( status == 1 ) break;␊
390 // Status==-1 means that the config file couldn't be loaded or that gBootVolume is NULL␊
391 if ( status == -1 )␊
392 {␊
393␉␉␉// gBootVolume == NULL usually means the user hit escape.␊
394␉␉␉if(gBootVolume == NULL)␊
395␉␉␉{␊
396␉␉␉␉freeFilteredBVChain(bvChain);␊
397#ifndef OPTION_ROM␊
398␉␉␉␉if (gEnableCDROMRescan)␊
399␉␉␉␉␉rescanBIOSDevice(gBIOSDev);␊
400#endif␊
401␉␉␉␉␊
402␉␉␉␉bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
403␉␉␉␉setBootGlobals(bvChain);␊
404␉␉␉}␊
405␉␉␉continue;␊
406 }␊
407␉␉␊
408␉␉␊
409␉␉␊
410 // Other status (e.g. 0) means that we should proceed with boot.␊
411␉␉␉␉␊
412␉␉␊
413␉␉// Find out which version mac os we're booting.␊
414␉␉getOSVersion(gMacOSVersion);␊
415␉␉␊
416␉␉if (platformCPUFeature(CPU_FEATURE_EM64T)) {␊
417␉␉␉archCpuType = CPU_TYPE_X86_64;␊
418␉␉} else {␊
419␉␉␉archCpuType = CPU_TYPE_I386;␊
420␉␉}␊
421␉␉if (getValueForKey(karch, &val, &len, &bootInfo->bootConfig)) {␊
422␉␉␉if (strncmp(val, "i386", 4) == 0) {␊
423␉␉␉␉archCpuType = CPU_TYPE_I386;␊
424␉␉␉}␊
425␉␉}␊
426␉␉␊
427␉␉// Notify moduals that we are attempting to boot␊
428␉␉execute_hook("PreBoot", NULL, NULL, NULL, NULL);␊
429␊
430␉␉if (!getBoolForKey (kWake, &tryresume, &bootInfo->bootConfig)) {␊
431␉␉␉tryresume = true;␊
432␉␉␉tryresumedefault = true;␊
433␉␉} else {␊
434␉␉␉tryresumedefault = false;␊
435␉␉}␊
436␉␉␊
437␉␉if (!getBoolForKey (kForceWake, &forceresume, &bootInfo->bootConfig)) {␊
438␉␉␉forceresume = false;␊
439␉␉}␊
440␉␉␊
441␉␉if (forceresume) {␊
442␉␉␉tryresume = true;␊
443␉␉␉tryresumedefault = false;␊
444␉␉}␊
445␉␉␊
446␉␉while (tryresume) {␊
447␉␉␉const char *tmp;␊
448␉␉␉BVRef bvr;␊
449␉␉␉if (!getValueForKey(kWakeImage, &val, &len, &bootInfo->bootConfig))␊
450␉␉␉␉val="/private/var/vm/sleepimage";␊
451␉␉␉␊
452␉␉␉// Do this first to be sure that root volume is mounted␊
453␉␉␉ret = GetFileInfo(0, val, &flags, &sleeptime);␊
454␉␉␉␊
455␉␉␉if ((bvr = getBootVolumeRef(val, &tmp)) == NULL)␊
456␉␉␉␉break;␊
457␉␉␉␊
458␉␉␉// Can't check if it was hibernation Wake=y is required␊
459␉␉␉if (bvr->modTime == 0 && tryresumedefault)␊
460␉␉␉␉break;␊
461␉␉␉␊
462␉␉␉if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat))␊
463␉␉␉␉break;␊
464␉␉␉␊
465␉␉␉if (!forceresume && ((sleeptime+3)<bvr->modTime)) {␊
466␉␉␉␉printf ("Hibernate image is too old by %d seconds. Use ForceWake=y to override\n",bvr->modTime-sleeptime);␊
467␉␉␉␉break;␊
468␉␉␉}␊
469␉␉␉␊
470␉␉␉HibernateBoot((char *)val);␊
471␉␉␉break;␊
472␉␉}␊
473␉␉␊
474 // Reset cache name.␊
475 bzero(gCacheNameAdler + 64, sizeof(gCacheNameAdler) - 64);␊
476␉␉␊
477 sprintf(gCacheNameAdler + 64, "%s,%s", gRootDevice, bootInfo->bootFile);␊
478␉␉␊
479 adler32 = Adler32((unsigned char *)gCacheNameAdler, sizeof(gCacheNameAdler));␊
480␉␉␊
481 if (getValueForKey(kKernelCacheKey, &val, &len, &bootInfo->bootConfig)) {␊
482 strlcpy(gBootKernelCacheFile, val, len+1);␊
483 } else {␊
484 sprintf(gBootKernelCacheFile, "%s.%08lX", kDefaultCachePath, adler32);␊
485 }␊
486␉␉␊
487 // Check for cache file.␊
488 trycache = (((gBootMode & kBootModeSafe) == 0) &&␊
489 !gOverrideKernel &&␊
490 (gBootFileType == kBlockDeviceType) &&␊
491 (gMKextName[0] == '\0') &&␊
492 (gBootKernelCacheFile[0] != '\0'));␊
493␉␉␊
494␉␉verbose("Loading Darwin %s\n", gMacOSVersion);␊
495␉␉␊
496 if (trycache) do {␊
497␉␉␉␊
498 // if we haven't found the kernel yet, don't use the cache␊
499 ret = GetFileInfo(NULL, bootInfo->bootFile, &flags, &kerneltime);␊
500 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)) {␊
501 trycache = 0;␊
502 break;␊
503 }␊
504 ret = GetFileInfo(NULL, gBootKernelCacheFile, &flags, &cachetime);␊
505 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)␊
506 || (cachetime < kerneltime)) {␊
507 trycache = 0;␊
508 break;␊
509 }␊
510 ret = GetFileInfo("/System/Library/", "Extensions", &flags, &exttime);␊
511 if ((ret == 0) && ((flags & kFileTypeMask) == kFileTypeDirectory)␊
512 && (cachetime < exttime)) {␊
513 trycache = 0;␊
514 break;␊
515 }␊
516 if (kerneltime > exttime) {␊
517 exttime = kerneltime;␊
518 }␊
519 if (cachetime != (exttime + 1)) {␊
520 trycache = 0;␊
521 break;␊
522 }␊
523 } while (0);␊
524␉␉␊
525 do {␊
526 if (trycache) {␊
527 bootFile = gBootKernelCacheFile;␊
528 verbose("Loading kernel cache %s\n", bootFile);␊
529 ret = LoadFile(bootFile);␊
530 binary = (void *)kLoadAddr;␊
531 if (ret >= 0) {␊
532 break;␊
533 }␊
534 }␊
535 bootFile = bootInfo->bootFile;␊
536␉␉␉␊
537 // Try to load kernel image from alternate locations on boot helper partitions.␊
538 sprintf(bootFileSpec, "com.apple.boot.P/%s", bootFile);␊
539 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
540 ␉ ␉ if (ret == -1)␊
541 ␉ ␉ {␊
542␉␉␉␉sprintf(bootFileSpec, "com.apple.boot.R/%s", bootFile);␊
543␉␉␉␉ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
544␉␉␉␉if (ret == -1)␊
545␉␉␉␉{␊
546␉␉␉␉␉sprintf(bootFileSpec, "com.apple.boot.S/%s", bootFile);␊
547␉␉␉␉␉ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
548␉␉␉␉␉if (ret == -1)␊
549␉␉␉␉␉{␊
550␉␉␉␉␉␉// Not found any alternate locations, using the original kernel image path.␊
551␉␉␉␉␉␉strcpy(bootFileSpec, bootFile);␊
552␉␉␉␉␉}␊
553␉␉␉␉}␊
554 }␊
555␉␉␉␊
556 verbose("Loading kernel %s\n", bootFileSpec);␊
557 ret = LoadThinFatFile(bootFileSpec, &binary);␊
558 if (ret <= 0 && archCpuType == CPU_TYPE_X86_64)␊
559 {␊
560␉␉␉␉archCpuType = CPU_TYPE_I386;␊
561␉␉␉␉ret = LoadThinFatFile(bootFileSpec, &binary);␉␉␉␉␊
562 }␊
563␉␉␉␊
564 } while (0);␊
565␉␉␊
566 clearActivityIndicator();␊
567#if DEBUG␊
568 printf("Pausing...");␊
569 sleep(8);␊
570#endif␊
571␉␉␊
572 if (ret <= 0) {␊
573␉␉␉printf("Can't find %s\n", bootFile);␊
574␉␉␉␊
575␉␉␉sleep(1);␊
576#ifndef OPTION_ROM␊
577 if (gBootFileType == kNetworkDeviceType) {␊
578 // Return control back to PXE. Don't unload PXE base code.␊
579 gUnloadPXEOnExit = false;␊
580 break;␊
581 }␊
582#endif␊
583 } else {␊
584 /* Won't return if successful. */␊
585␉␉␉// Notify modules that ExecKernel is about to be called␊
586 ret = ExecKernel(binary);␊
587 }␊
588 }␊
589 ␊
590 // chainboot␊
591 if (status==1) {␊
592␉␉if (getVideoMode() == GRAPHICS_MODE) {␉// if we are already in graphics-mode,␊
593␉␉␉setVideoMode(VGA_TEXT_MODE, 0);␉// switch back to text mode␊
594␉␉}␊
595 }␊
596#ifndef OPTION_ROM␊
597 if ((gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit) {␊
598␉␉nbpUnloadBaseCode();␊
599 }␊
600#endif␊
601}␊
602␊
603/*!␊
604 Selects a new BIOS device, taking care to update the global state appropriately.␊
605 */␊
606/*␊
607 static void selectBiosDevice(void)␊
608 {␊
609 struct DiskBVMap *oldMap = diskResetBootVolumes(gBIOSDev);␊
610 CacheReset();␊
611 diskFreeMap(oldMap);␊
612 oldMap = NULL;␊
613 ␊
614 int dev = selectAlternateBootDevice(gBIOSDev);␊
615 ␊
616 BVRef bvchain = scanBootVolumes(dev, 0);␊
617 BVRef bootVol = selectBootVolume(bvchain);␊
618 gBootVolume = bootVol;␊
619 setRootVolume(bootVol);␊
620 gBIOSDev = dev;␊
621 }␊
622 */␊
623␊
624static bool getOSVersion(char *str)␊
625{␊
626␉bool valid = false;␊
627␉config_file_t systemVersion;␊
628␉const char *val;␊
629␉int len;␊
630␉␊
631␉if (!loadConfigFile("System/Library/CoreServices/SystemVersion.plist", &systemVersion))␊
632␉{␊
633␉␉valid = true;␊
634␉}␊
635␉else if (!loadConfigFile("System/Library/CoreServices/ServerVersion.plist", &systemVersion))␊
636␉{␊
637␉␉valid = true;␊
638␉}␊
639␉␊
640␉if (valid)␊
641␉{␊
642␉␉if (getValueForKey(kProductVersion, &val, &len, &systemVersion))␊
643␉␉{␊
644␉␉␉// getValueForKey uses const char for val␊
645␉␉␉// so copy it and trim␊
646␉␉␉*str = '\0';␊
647␉␉␉strncat(str, val, MIN(len, 4));␊
648␉␉}␊
649␉␉else␊
650␉␉␉valid = false;␊
651␉}␊
652␉␊
653␉return valid;␊
654}␊
655␊
656#define BASE 65521L /* largest prime smaller than 65536 */␊
657#define NMAX 5000␊
658// NMAX (was 5521) the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1␊
659␊
660#define DO1(buf,i) {s1 += buf[i]; s2 += s1;}␊
661#define DO2(buf,i) DO1(buf,i); DO1(buf,i+1);␊
662#define DO4(buf,i) DO2(buf,i); DO2(buf,i+2);␊
663#define DO8(buf,i) DO4(buf,i); DO4(buf,i+4);␊
664#define DO16(buf) DO8(buf,0); DO8(buf,8);␊
665␊
666unsigned long Adler32(unsigned char *buf, long len)␊
667{␊
668 unsigned long s1 = 1; // adler & 0xffff;␊
669 unsigned long s2 = 0; // (adler >> 16) & 0xffff;␊
670 unsigned long result;␊
671 int k;␊
672␉␊
673 while (len > 0) {␊
674 k = len < NMAX ? len : NMAX;␊
675 len -= k;␊
676 while (k >= 16) {␊
677 DO16(buf);␊
678 buf += 16;␊
679 k -= 16;␊
680 }␊
681 if (k != 0) do {␊
682 s1 += *buf++;␊
683 s2 += s1;␊
684 } while (--k);␊
685 s1 %= BASE;␊
686 s2 %= BASE;␊
687 }␊
688 result = (s2 << 16) | s1;␊
689 return OSSwapHostToBigInt32(result);␊
690}␊
691

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