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Root/branches/meklort/i386/boot2/boot.c

Source at commit 535 created 13 years 7 months ago.
By meklort, Removed unneeded code when embeded in an option rom
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];␊
70#ifndef OPTION_ROM␊
71bool gEnableCDROMRescan;␊
72bool gScanSingleDrive;␊
73#endif␊
74␊
75int bvCount = 0;␊
76//int␉menucount = 0;␊
77int gDeviceCount = 0; ␊
78␊
79bool␉recoveryMode = false;␊
80␊
81BVRef bvr;␊
82BVRef menuBVR;␊
83BVRef bvChain;␊
84␊
85//static void selectBiosDevice(void);␊
86static unsigned long Adler32(unsigned char *buffer, long length);␊
87static bool getOSVersion(char *str);␊
88␊
89static bool gUnloadPXEOnExit = false;␊
90␊
91/*␊
92 * How long to wait (in seconds) to load the␊
93 * kernel after displaying the "boot:" prompt.␊
94 */␊
95#define kBootErrorTimeout 5␊
96␊
97/*␊
98 * Default path to kernel cache file␊
99 */␊
100#define kDefaultCachePath "/System/Library/Caches/com.apple.kernelcaches/kernelcache"␊
101␊
102//==========================================================================␊
103// Zero the BSS.␊
104␊
105static void zeroBSS(void)␊
106{␊
107␉extern char _DATA__bss__begin, _DATA__bss__end;␊
108␉extern char _DATA__common__begin, _DATA__common__end;␊
109␉␊
110␉bzero(&_DATA__bss__begin, (&_DATA__bss__end - &_DATA__bss__begin));␊
111␉bzero(&_DATA__common__begin, (&_DATA__common__end - &_DATA__common__begin));␊
112}␊
113␊
114//==========================================================================␊
115// Malloc error function␊
116␊
117static void malloc_error(char *addr, size_t size, const char *file, int line)␊
118{␊
119␉stop("\nMemory allocation error! Addr=0x%x, Size=0x%x, File=%s, Line=%d\n", (unsigned)addr, (unsigned)size, file, line);␊
120}␊
121␊
122//==========================================================================␊
123//Initializes the runtime. Right now this means zeroing the BSS and initializing malloc.␊
124//␊
125void initialize_runtime(void)␊
126{␊
127␉zeroBSS();␊
128␉malloc_init(0, 0, 0, malloc_error);␊
129}␊
130␊
131//==========================================================================␊
132// execKernel - Load the kernel image (mach-o) and jump to its entry point.␊
133␊
134static int ExecKernel(void *binary)␊
135{␊
136 entry_t kernelEntry;␊
137 int ret;␊
138␉␊
139 bootArgs->kaddr = bootArgs->ksize = 0;␊
140␉␊
141 ret = DecodeKernel(binary,␊
142 &kernelEntry,␊
143 (char **) &bootArgs->kaddr,␊
144 (int *)&bootArgs->ksize );␊
145␉␊
146 if ( ret != 0 )␊
147 return ret;␊
148␉␊
149 // Reserve space for boot args␊
150 reserveKernBootStruct();␊
151␉␊
152 // Load boot drivers from the specifed root path.␊
153␉␊
154 if (!gHaveKernelCache) {␊
155␉␉LoadDrivers("/");␊
156 }␊
157␉␊
158 clearActivityIndicator();␊
159␉␊
160 if (gErrors) {␊
161 printf("Errors encountered while starting up the computer.\n");␊
162 printf("Pausing %d seconds...\n", kBootErrorTimeout);␊
163 sleep(kBootErrorTimeout);␊
164 }␊
165␉␊
166␉md0Ramdisk();␊
167␉␊
168 setupFakeEfi();␊
169␉␉␊
170 verbose("Starting Darwin %s\n",( archCpuType == CPU_TYPE_I386 ) ? "x86" : "x86_64");␊
171#ifndef OPTION_ROM␊
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#endif ␊
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#ifndef OPTION_ROM␊
251 bool rescanPrompt;␊
252#endif␊
253 unsigned int allowBVFlags = kBVFlagSystemVolume|kBVFlagForeignBoot;␊
254 unsigned int denyBVFlags = kBVFlagEFISystem;␊
255␉␊
256#ifndef OPTION_ROM␊
257 // Set reminder to unload the PXE base code. Neglect to unload␊
258 // the base code will result in a hang or kernel panic.␊
259 gUnloadPXEOnExit = true;␊
260#endif␊
261␉␊
262 // Record the device that the booter was loaded from.␊
263 gBIOSDev = biosdev & kBIOSDevMask;␊
264␉␊
265 // Initialize boot info structure.␊
266 initKernBootStruct();␊
267␉␊
268␉initBooterLog();␊
269␉␊
270 // Setup VGA text mode.␊
271 // Not sure if it is safe to call setVideoMode() before the␊
272 // config table has been loaded. Call video_mode() instead.␊
273#if DEBUG␊
274 printf("before video_mode\n");␊
275#endif␊
276 video_mode( 2 ); // 80x25 mono text mode.␊
277#if DEBUG␊
278 printf("after video_mode\n");␊
279#endif␊
280␉␊
281 // Scan and record the system's hardware information.␊
282 scan_platform();␊
283␉␊
284 // First get info for boot volume.␊
285 scanBootVolumes(gBIOSDev, 0);␊
286 bvChain = getBVChainForBIOSDev(gBIOSDev);␊
287 setBootGlobals(bvChain);␊
288␉␊
289 // Load boot.plist config file␊
290 status = loadSystemConfig(&bootInfo->bootConfig);␊
291␉␊
292 if (getBoolForKey(kQuietBootKey, &quiet, &bootInfo->bootConfig) && quiet) {␊
293 gBootMode |= kBootModeQuiet;␊
294 }␊
295␉␊
296 // Override firstRun to get to the boot menu instantly by setting "Instant Menu"=y in system config␊
297 if (getBoolForKey(kInsantMenuKey, &instantMenu, &bootInfo->bootConfig) && instantMenu) {␊
298 firstRun = false;␊
299 }␊
300␉␊
301#ifndef OPTION_ROM␊
302␉// Enable touching a single BIOS device only if "Scan Single Drive"=y is set in system config.␊
303 if (getBoolForKey(kScanSingleDriveKey, &gScanSingleDrive, &bootInfo->bootConfig) && gScanSingleDrive) {␊
304 gScanSingleDrive = true;␊
305 }␊
306␉␊
307␉// Create a list of partitions on device(s).␊
308 if (gScanSingleDrive)␊
309␉{␊
310␉␉scanBootVolumes(gBIOSDev, &bvCount);␊
311 } ␊
312␉else ␊
313#endif␊
314␉{␊
315␉␉scanDisks(gBIOSDev, &bvCount);␊
316 }␊
317␉␊
318␉// Create a separated bvr chain using the specified filters.␊
319 bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
320␉gBootVolume = selectBootVolume(bvChain);␊
321␉␊
322␉␊
323␉// Intialize module system␊
324␉if(init_module_system())␊
325␉{␊
326␉␉load_all_modules();␊
327␉}␊
328␉␊
329␉␊
330#ifndef OPTION_ROM␊
331 // Loading preboot ramdisk if exists.␊
332 loadPrebootRAMDisk();␊
333␉␊
334 // Disable rescan option by default␊
335 gEnableCDROMRescan = false;␊
336␉␊
337 // Enable it with Rescan=y in system config␊
338 if (getBoolForKey(kRescanKey, &gEnableCDROMRescan, &bootInfo->bootConfig) && gEnableCDROMRescan) {␊
339 gEnableCDROMRescan = true;␊
340 }␊
341␉␊
342 // Ask the user for Rescan option by setting "Rescan Prompt"=y in system config.␊
343 rescanPrompt = false;␊
344 if (getBoolForKey(kRescanPromptKey, &rescanPrompt , &bootInfo->bootConfig) && rescanPrompt && biosDevIsCDROM(gBIOSDev)) {␊
345 gEnableCDROMRescan = promptForRescanOption();␊
346 }␊
347#endif␊
348␉␊
349␊
350␉␊
351␉␊
352#if DEBUG␊
353 printf(" Default: %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBootVolume, gBootVolume->biosdev, gBootVolume->part_no, gBootVolume->flags);␊
354 printf(" bt(0,0): %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBIOSBootVolume, gBIOSBootVolume->biosdev, gBIOSBootVolume->part_no, gBIOSBootVolume->flags);␊
355 getc();␊
356#endif␊
357␉␊
358␉␊
359␉␊
360 setBootGlobals(bvChain);␊
361␉␊
362 // Parse args, load and start kernel.␊
363 while (1) {␊
364 const char *val;␊
365 int len;␊
366 int trycache;␊
367 long flags, cachetime, kerneltime, exttime, sleeptime, time;␊
368 int ret = -1;␊
369 void *binary = (void *)kLoadAddr;␊
370 bool tryresume;␊
371 bool tryresumedefault;␊
372 bool forceresume;␊
373␉␉␊
374 // additional variable for testing alternate kernel image locations on boot helper partitions.␊
375 char bootFileSpec[512];␊
376␉␉␊
377 // Initialize globals.␊
378␉␉␊
379 sysConfigValid = false;␊
380 gErrors = false;␊
381␉␉␊
382 status = getBootOptions(firstRun);␊
383 firstRun = false;␊
384 if (status == -1) continue;␊
385␉␉␊
386 status = processBootOptions();␊
387 // Status==1 means to chainboot␊
388 if ( status == 1 ) break;␊
389 // Status==-1 means that the config file couldn't be loaded or that gBootVolume is NULL␊
390 if ( status == -1 )␊
391 {␊
392␉␉␉// gBootVolume == NULL usually means the user hit escape.␊
393␉␉␉if(gBootVolume == NULL)␊
394␉␉␉{␊
395␉␉␉␉freeFilteredBVChain(bvChain);␊
396#ifndef OPTION_ROM␊
397␉␉␉␉if (gEnableCDROMRescan)␊
398␉␉␉␉␉rescanBIOSDevice(gBIOSDev);␊
399#endif␊
400␉␉␉␉␊
401␉␉␉␉bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
402␉␉␉␉setBootGlobals(bvChain);␊
403␉␉␉}␊
404␉␉␉continue;␊
405 }␊
406␉␉␊
407␉␉␊
408␉␉␊
409 // Other status (e.g. 0) means that we should proceed with boot.␊
410␉␉␉␉␊
411␉␉// Notify moduals that we are attempting to boot␊
412␉␉execute_hook("PreBoot", NULL, NULL, NULL, NULL);␊
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#ifndef OPTION_ROM␊
575 if (gBootFileType == kNetworkDeviceType) {␊
576 // Return control back to PXE. Don't unload PXE base code.␊
577 gUnloadPXEOnExit = false;␊
578 break;␊
579 }␊
580#endif␊
581 } else {␊
582 /* Won't return if successful. */␊
583␉␉␉// Notify modules that ExecKernel is about to be called␊
584␉␉␉execute_hook("ExecKernel", binary, NULL, NULL, NULL);␊
585 ret = ExecKernel(binary);␊
586 }␊
587 }␊
588 ␊
589 // chainboot␊
590 if (status==1) {␊
591␉␉if (getVideoMode() == GRAPHICS_MODE) {␉// if we are already in graphics-mode,␊
592␉␉␉setVideoMode(VGA_TEXT_MODE, 0);␉// switch back to text mode␊
593␉␉}␊
594 }␊
595#ifndef OPTION_ROM␊
596 if ((gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit) {␊
597␉␉nbpUnloadBaseCode();␊
598 }␊
599#endif␊
600}␊
601␊
602/*!␊
603 Selects a new BIOS device, taking care to update the global state appropriately.␊
604 */␊
605/*␊
606 static void selectBiosDevice(void)␊
607 {␊
608 struct DiskBVMap *oldMap = diskResetBootVolumes(gBIOSDev);␊
609 CacheReset();␊
610 diskFreeMap(oldMap);␊
611 oldMap = NULL;␊
612 ␊
613 int dev = selectAlternateBootDevice(gBIOSDev);␊
614 ␊
615 BVRef bvchain = scanBootVolumes(dev, 0);␊
616 BVRef bootVol = selectBootVolume(bvchain);␊
617 gBootVolume = bootVol;␊
618 setRootVolume(bootVol);␊
619 gBIOSDev = dev;␊
620 }␊
621 */␊
622␊
623static bool getOSVersion(char *str)␊
624{␊
625␉bool valid = false;␊
626␉config_file_t systemVersion;␊
627␉const char *val;␊
628␉int len;␊
629␉␊
630␉if (!loadConfigFile("System/Library/CoreServices/SystemVersion.plist", &systemVersion))␊
631␉{␊
632␉␉valid = true;␊
633␉}␊
634␉else if (!loadConfigFile("System/Library/CoreServices/ServerVersion.plist", &systemVersion))␊
635␉{␊
636␉␉valid = true;␊
637␉}␊
638␉␊
639␉if (valid)␊
640␉{␊
641␉␉if (getValueForKey(kProductVersion, &val, &len, &systemVersion))␊
642␉␉{␊
643␉␉␉// getValueForKey uses const char for val␊
644␉␉␉// so copy it and trim␊
645␉␉␉*str = '\0';␊
646␉␉␉strncat(str, val, MIN(len, 4));␊
647␉␉}␊
648␉␉else␊
649␉␉␉valid = false;␊
650␉}␊
651␉␊
652␉return valid;␊
653}␊
654␊
655#define BASE 65521L /* largest prime smaller than 65536 */␊
656#define NMAX 5000␊
657// NMAX (was 5521) the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1␊
658␊
659#define DO1(buf,i) {s1 += buf[i]; s2 += s1;}␊
660#define DO2(buf,i) DO1(buf,i); DO1(buf,i+1);␊
661#define DO4(buf,i) DO2(buf,i); DO2(buf,i+2);␊
662#define DO8(buf,i) DO4(buf,i); DO4(buf,i+4);␊
663#define DO16(buf) DO8(buf,0); DO8(buf,8);␊
664␊
665unsigned long Adler32(unsigned char *buf, long len)␊
666{␊
667 unsigned long s1 = 1; // adler & 0xffff;␊
668 unsigned long s2 = 0; // (adler >> 16) & 0xffff;␊
669 unsigned long result;␊
670 int k;␊
671␉␊
672 while (len > 0) {␊
673 k = len < NMAX ? len : NMAX;␊
674 len -= k;␊
675 while (k >= 16) {␊
676 DO16(buf);␊
677 buf += 16;␊
678 k -= 16;␊
679 }␊
680 if (k != 0) do {␊
681 s1 += *buf++;␊
682 s2 += s1;␊
683 } while (--k);␊
684 s1 %= BASE;␊
685 s2 %= BASE;␊
686 }␊
687 result = (s2 << 16) | s1;␊
688 return OSSwapHostToBigInt32(result);␊
689}␊
690

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