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

Source at commit 606 created 13 years 5 months ago.
By meklort, Kext patcher update. Can now patch both the gma950 binary and plist in mem. Will add error detections and device id detection to determine if a patch is required
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␊
137static int 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␉␊
153 // Reserve space for boot args␊
154 reserveKernBootStruct();␊
155␉␊
156 // Load boot drivers from the specifed root path.␊
157␉␊
158 if (!gHaveKernelCache) {␊
159␉␉LoadDrivers("/");␊
160 }␊
161␉␊
162 clearActivityIndicator();␊
163␉␊
164 if (gErrors) {␊
165 printf("Errors encountered while starting up the computer.\n");␊
166 printf("Pausing %d seconds...\n", kBootErrorTimeout);␊
167 sleep(kBootErrorTimeout);␊
168 }␊
169␉␊
170␉md0Ramdisk();␊
171␉␊
172 setupFakeEfi();␊
173␉␉␊
174 verbose("Starting Darwin %s\n",( archCpuType == CPU_TYPE_I386 ) ? "x86" : "x86_64");␊
175#ifndef OPTION_ROM␊
176 // Cleanup the PXE base code.␊
177␉␊
178 if ( (gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit ) {␊
179␉␉if ( (ret = nbpUnloadBaseCode()) != nbpStatusSuccess )␊
180 {␊
181 ␉printf("nbpUnloadBaseCode error %d\n", (int) ret);␊
182 sleep(2);␊
183 }␊
184 }␊
185#endif ␊
186 bool dummyVal;␊
187␉if (getBoolForKey(kWaitForKeypressKey, &dummyVal, &bootInfo->bootConfig) && dummyVal) {␊
188␉␉printf("Press any key to continue...");␊
189␉␉getc();␊
190␉}␊
191␉␉␊
192␉if (bootArgs->Video.v_display == VGA_TEXT_MODE)␊
193␉{␊
194␉␉setVideoMode( GRAPHICS_MODE, 0 );␊
195␉␉// Draw gray screen. NOTE: no boot image, that's in the gui module␊
196#ifndef OPTION_ROM␊
197␉␉if(!gVerboseMode) drawColorRectangle(0, 0, DEFAULT_SCREEN_WIDTH, DEFAULT_SCREEN_HEIGHT, 0x01); ␊
198#endif␊
199␉}␊
200␊
201␉␊
202␉setupBooterLog();␊
203␉␊
204 finalizeBootStruct();␊
205 ␉␊
206␉execute_hook("Kernel Start", (void*)kernelEntry, (void*)bootArgs, NULL, NULL);␉// Notify modules that the kernel is about to be started␊
207␊
208␉// Jump to kernel's entry point. There's no going back now.␊
209 startprog( kernelEntry, bootArgs );␊
210␉␊
211 // Not reached␊
212␉␊
213 return 0;␊
214}␊
215␊
216//==========================================================================␊
217// This is the entrypoint from real-mode which functions exactly as it did␊
218// before. Multiboot does its own runtime initialization, does some of its␊
219// own things, and then calls common_boot.␊
220void boot(int biosdev)␊
221{␊
222␉initialize_runtime();␊
223␉// Enable A20 gate before accessing memory above 1Mb.␊
224␉enableA20();␊
225␉common_boot(biosdev);␊
226}␊
227␊
228//==========================================================================␊
229// The 'main' function for the booter. Called by boot0 when booting␊
230// from a block device, or by the network booter.␊
231//␊
232// arguments:␊
233// biosdev - Value passed from boot1/NBP to specify the device␊
234// that the booter was loaded from.␊
235//␊
236// If biosdev is kBIOSDevNetwork, then this function will return if␊
237// booting was unsuccessful. This allows the PXE firmware to try the␊
238// next boot device on its list.␊
239void common_boot(int biosdev)␊
240{␊
241 int status;␊
242 char *bootFile;␊
243 unsigned long adler32;␊
244 bool quiet;␊
245 bool firstRun = true;␊
246 bool instantMenu;␊
247#ifndef OPTION_ROM␊
248 bool rescanPrompt;␊
249#endif␊
250 unsigned int allowBVFlags = kBVFlagSystemVolume|kBVFlagForeignBoot;␊
251 unsigned int denyBVFlags = kBVFlagEFISystem;␊
252␉␊
253#ifndef OPTION_ROM␊
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#endif␊
258␉␊
259 // Record the device that the booter was loaded from.␊
260 gBIOSDev = biosdev & kBIOSDevMask;␊
261␉␊
262 // Initialize boot info structure.␊
263 initKernBootStruct();␊
264␉␊
265␉initBooterLog();␊
266␉␊
267 // Setup VGA text mode.␊
268 // Not sure if it is safe to call setVideoMode() before the␊
269 // config table has been loaded. Call video_mode() instead.␊
270#if DEBUG␊
271 printf("before video_mode\n");␊
272#endif␊
273 video_mode( 2 ); // 80x25 mono text mode.␊
274#if DEBUG␊
275 printf("after video_mode\n");␊
276#endif␊
277␉␊
278 // Scan and record the system's hardware information.␊
279 scan_platform();␊
280␉␊
281 // First get info for boot volume.␊
282 scanBootVolumes(gBIOSDev, 0);␊
283 bvChain = getBVChainForBIOSDev(gBIOSDev);␊
284 setBootGlobals(bvChain);␊
285␉␊
286 // Load boot.plist config file␊
287 status = loadSystemConfig(&bootInfo->bootConfig);␊
288␉␊
289 if (getBoolForKey(kQuietBootKey, &quiet, &bootInfo->bootConfig) && quiet) {␊
290 gBootMode |= kBootModeQuiet;␊
291 }␊
292␉␊
293 // Override firstRun to get to the boot menu instantly by setting "Instant Menu"=y in system config␊
294 if (getBoolForKey(kInsantMenuKey, &instantMenu, &bootInfo->bootConfig) && instantMenu) {␊
295 firstRun = false;␊
296 }␊
297␉␊
298#ifndef OPTION_ROM␊
299␉// Enable touching a single BIOS device only if "Scan Single Drive"=y is set in system config.␊
300 if (getBoolForKey(kScanSingleDriveKey, &gScanSingleDrive, &bootInfo->bootConfig) && gScanSingleDrive) {␊
301 gScanSingleDrive = true;␊
302 }␊
303␉␊
304␉// Create a list of partitions on device(s).␊
305 if (gScanSingleDrive)␊
306␉{␊
307␉␉scanBootVolumes(gBIOSDev, &bvCount);␊
308 } ␊
309␉else ␊
310#endif␊
311␉{␊
312␉␉scanDisks(gBIOSDev, &bvCount);␊
313 }␊
314␉␊
315␉// Create a separated bvr chain using the specified filters.␊
316 bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
317␉gBootVolume = selectBootVolume(bvChain);␊
318␉␊
319␉␊
320␉// Intialize module system␊
321␉if(init_module_system())␊
322␉{␊
323␉␉load_all_modules();␊
324␉}␊
325␉␊
326␉␊
327#ifndef OPTION_ROM␊
328 // Loading preboot ramdisk if exists.␊
329 loadPrebootRAMDisk();␊
330␉␊
331 // Disable rescan option by default␊
332 gEnableCDROMRescan = false;␊
333␉␊
334 // Enable it with Rescan=y in system config␊
335 if (getBoolForKey(kRescanKey, &gEnableCDROMRescan, &bootInfo->bootConfig) && gEnableCDROMRescan) {␊
336 gEnableCDROMRescan = true;␊
337 }␊
338␉␊
339 // Ask the user for Rescan option by setting "Rescan Prompt"=y in system config.␊
340 rescanPrompt = false;␊
341 if (getBoolForKey(kRescanPromptKey, &rescanPrompt , &bootInfo->bootConfig) && rescanPrompt && biosDevIsCDROM(gBIOSDev)) {␊
342 gEnableCDROMRescan = promptForRescanOption();␊
343 }␊
344#endif␊
345␉␊
346␊
347␉␊
348␉␊
349#if DEBUG␊
350 printf(" Default: %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBootVolume, gBootVolume->biosdev, gBootVolume->part_no, gBootVolume->flags);␊
351 printf(" bt(0,0): %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBIOSBootVolume, gBIOSBootVolume->biosdev, gBIOSBootVolume->part_no, gBIOSBootVolume->flags);␊
352 getc();␊
353#endif␊
354␉␊
355␉␊
356␉␊
357 setBootGlobals(bvChain);␊
358␉␊
359 // Parse args, load and start kernel.␊
360 while (1) {␊
361 const char *val;␊
362 int len;␊
363 int trycache;␊
364 long flags, cachetime, kerneltime, exttime, sleeptime, time;␊
365 int ret = -1;␊
366 void *binary = (void *)kLoadAddr;␊
367 bool tryresume;␊
368 bool tryresumedefault;␊
369 bool forceresume;␊
370␉␉␊
371 // additional variable for testing alternate kernel image locations on boot helper partitions.␊
372 char bootFileSpec[512];␊
373␉␉␊
374 // Initialize globals.␊
375␉␉␊
376 sysConfigValid = false;␊
377 gErrors = false;␊
378␉␉␊
379 status = getBootOptions(firstRun);␊
380 firstRun = false;␊
381 if (status == -1) continue;␊
382␉␉␊
383 status = processBootOptions();␊
384 // Status==1 means to chainboot␊
385 if ( status == 1 ) break;␊
386 // Status==-1 means that the config file couldn't be loaded or that gBootVolume is NULL␊
387 if ( status == -1 )␊
388 {␊
389␉␉␉// gBootVolume == NULL usually means the user hit escape.␊
390␉␉␉if(gBootVolume == NULL)␊
391␉␉␉{␊
392␉␉␉␉freeFilteredBVChain(bvChain);␊
393#ifndef OPTION_ROM␊
394␉␉␉␉if (gEnableCDROMRescan)␊
395␉␉␉␉␉rescanBIOSDevice(gBIOSDev);␊
396#endif␊
397␉␉␉␉␊
398␉␉␉␉bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
399␉␉␉␉setBootGlobals(bvChain);␊
400␉␉␉}␊
401␉␉␉continue;␊
402 }␊
403␉␉␊
404␉␉␊
405␉␉␊
406 // Other status (e.g. 0) means that we should proceed with boot.␊
407␉␉␉␉␊
408␉␉␊
409␉␉// Find out which version mac os we're booting.␊
410␉␉getOSVersion(gMacOSVersion);␊
411␉␉␊
412␉␉if (platformCPUFeature(CPU_FEATURE_EM64T)) {␊
413␉␉␉archCpuType = CPU_TYPE_X86_64;␊
414␉␉} else {␊
415␉␉␉archCpuType = CPU_TYPE_I386;␊
416␉␉}␊
417␉␉if (getValueForKey(karch, &val, &len, &bootInfo->bootConfig)) {␊
418␉␉␉if (strncmp(val, "i386", 4) == 0) {␊
419␉␉␉␉archCpuType = CPU_TYPE_I386;␊
420␉␉␉}␊
421␉␉}␊
422␉␉␊
423␉␉// Notify moduals that we are attempting to boot␊
424␉␉execute_hook("PreBoot", NULL, NULL, NULL, NULL);␊
425␊
426␉␉if (!getBoolForKey (kWake, &tryresume, &bootInfo->bootConfig)) {␊
427␉␉␉tryresume = true;␊
428␉␉␉tryresumedefault = true;␊
429␉␉} else {␊
430␉␉␉tryresumedefault = false;␊
431␉␉}␊
432␉␉␊
433␉␉if (!getBoolForKey (kForceWake, &forceresume, &bootInfo->bootConfig)) {␊
434␉␉␉forceresume = false;␊
435␉␉}␊
436␉␉␊
437␉␉if (forceresume) {␊
438␉␉␉tryresume = true;␊
439␉␉␉tryresumedefault = false;␊
440␉␉}␊
441␉␉␊
442␉␉while (tryresume) {␊
443␉␉␉const char *tmp;␊
444␉␉␉BVRef bvr;␊
445␉␉␉if (!getValueForKey(kWakeImage, &val, &len, &bootInfo->bootConfig))␊
446␉␉␉␉val="/private/var/vm/sleepimage";␊
447␉␉␉␊
448␉␉␉// Do this first to be sure that root volume is mounted␊
449␉␉␉ret = GetFileInfo(0, val, &flags, &sleeptime);␊
450␉␉␉␊
451␉␉␉if ((bvr = getBootVolumeRef(val, &tmp)) == NULL)␊
452␉␉␉␉break;␊
453␉␉␉␊
454␉␉␉// Can't check if it was hibernation Wake=y is required␊
455␉␉␉if (bvr->modTime == 0 && tryresumedefault)␊
456␉␉␉␉break;␊
457␉␉␉␊
458␉␉␉if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat))␊
459␉␉␉␉break;␊
460␉␉␉␊
461␉␉␉if (!forceresume && ((sleeptime+3)<bvr->modTime)) {␊
462␉␉␉␉printf ("Hibernate image is too old by %d seconds. Use ForceWake=y to override\n",bvr->modTime-sleeptime);␊
463␉␉␉␉break;␊
464␉␉␉}␊
465␉␉␉␊
466␉␉␉HibernateBoot((char *)val);␊
467␉␉␉break;␊
468␉␉}␊
469␉␉␊
470 // Reset cache name.␊
471 bzero(gCacheNameAdler + 64, sizeof(gCacheNameAdler) - 64);␊
472␉␉␊
473 sprintf(gCacheNameAdler + 64, "%s,%s", gRootDevice, bootInfo->bootFile);␊
474␉␉␊
475 adler32 = Adler32((unsigned char *)gCacheNameAdler, sizeof(gCacheNameAdler));␊
476␉␉␊
477 if (getValueForKey(kKernelCacheKey, &val, &len, &bootInfo->bootConfig)) {␊
478 strlcpy(gBootKernelCacheFile, val, len+1);␊
479 } else {␊
480 sprintf(gBootKernelCacheFile, "%s.%08lX", kDefaultCachePath, adler32);␊
481 }␊
482␉␉␊
483 // Check for cache file.␊
484 trycache = (((gBootMode & kBootModeSafe) == 0) &&␊
485 !gOverrideKernel &&␊
486 (gBootFileType == kBlockDeviceType) &&␊
487 (gMKextName[0] == '\0') &&␊
488 (gBootKernelCacheFile[0] != '\0'));␊
489␉␉␊
490␉␉verbose("Loading Darwin %s\n", gMacOSVersion);␊
491␉␉␊
492 if (trycache) do {␊
493␉␉␉␊
494 // if we haven't found the kernel yet, don't use the cache␊
495 ret = GetFileInfo(NULL, bootInfo->bootFile, &flags, &kerneltime);␊
496 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)) {␊
497 trycache = 0;␊
498 break;␊
499 }␊
500 ret = GetFileInfo(NULL, gBootKernelCacheFile, &flags, &cachetime);␊
501 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)␊
502 || (cachetime < kerneltime)) {␊
503 trycache = 0;␊
504 break;␊
505 }␊
506 ret = GetFileInfo("/System/Library/", "Extensions", &flags, &exttime);␊
507 if ((ret == 0) && ((flags & kFileTypeMask) == kFileTypeDirectory)␊
508 && (cachetime < exttime)) {␊
509 trycache = 0;␊
510 break;␊
511 }␊
512 if (kerneltime > exttime) {␊
513 exttime = kerneltime;␊
514 }␊
515 if (cachetime != (exttime + 1)) {␊
516 trycache = 0;␊
517 break;␊
518 }␊
519 } while (0);␊
520␉␉␊
521 do {␊
522 if (trycache) {␊
523 bootFile = gBootKernelCacheFile;␊
524 verbose("Loading kernel cache %s\n", bootFile);␊
525 ret = LoadFile(bootFile);␊
526 binary = (void *)kLoadAddr;␊
527 if (ret >= 0) {␊
528 break;␊
529 }␊
530 }␊
531 bootFile = bootInfo->bootFile;␊
532␉␉␉␊
533 // Try to load kernel image from alternate locations on boot helper partitions.␊
534 sprintf(bootFileSpec, "com.apple.boot.P/%s", bootFile);␊
535 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
536 ␉ ␉ if (ret == -1)␊
537 ␉ ␉ {␊
538␉␉␉␉sprintf(bootFileSpec, "com.apple.boot.R/%s", bootFile);␊
539␉␉␉␉ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
540␉␉␉␉if (ret == -1)␊
541␉␉␉␉{␊
542␉␉␉␉␉sprintf(bootFileSpec, "com.apple.boot.S/%s", bootFile);␊
543␉␉␉␉␉ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
544␉␉␉␉␉if (ret == -1)␊
545␉␉␉␉␉{␊
546␉␉␉␉␉␉// Not found any alternate locations, using the original kernel image path.␊
547␉␉␉␉␉␉strcpy(bootFileSpec, bootFile);␊
548␉␉␉␉␉}␊
549␉␉␉␉}␊
550 }␊
551␉␉␉␊
552 verbose("Loading kernel %s\n", bootFileSpec);␊
553 ret = LoadThinFatFile(bootFileSpec, &binary);␊
554 if (ret <= 0 && archCpuType == CPU_TYPE_X86_64)␊
555 {␊
556␉␉␉␉archCpuType = CPU_TYPE_I386;␊
557␉␉␉␉ret = LoadThinFatFile(bootFileSpec, &binary);␉␉␉␉␊
558 }␊
559␉␉␉␊
560 } while (0);␊
561␉␉␊
562 clearActivityIndicator();␊
563#if DEBUG␊
564 printf("Pausing...");␊
565 sleep(8);␊
566#endif␊
567␉␉␊
568 if (ret <= 0) {␊
569␉␉␉printf("Can't find %s\n", bootFile);␊
570␉␉␉␊
571␉␉␉sleep(1);␊
572#ifndef OPTION_ROM␊
573 if (gBootFileType == kNetworkDeviceType) {␊
574 // Return control back to PXE. Don't unload PXE base code.␊
575 gUnloadPXEOnExit = false;␊
576 break;␊
577 }␊
578#endif␊
579 } else {␊
580 /* Won't return if successful. */␊
581␉␉␉// Notify modules that ExecKernel is about to be called␊
582 ret = ExecKernel(binary);␊
583 }␊
584 }␊
585 ␊
586 // chainboot␊
587 if (status==1) {␊
588␉␉if (getVideoMode() == GRAPHICS_MODE) {␉// if we are already in graphics-mode,␊
589␉␉␉setVideoMode(VGA_TEXT_MODE, 0);␉// switch back to text mode␊
590␉␉}␊
591 }␊
592#ifndef OPTION_ROM␊
593 if ((gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit) {␊
594␉␉nbpUnloadBaseCode();␊
595 }␊
596#endif␊
597}␊
598␊
599/*!␊
600 Selects a new BIOS device, taking care to update the global state appropriately.␊
601 */␊
602/*␊
603 static void selectBiosDevice(void)␊
604 {␊
605 struct DiskBVMap *oldMap = diskResetBootVolumes(gBIOSDev);␊
606 CacheReset();␊
607 diskFreeMap(oldMap);␊
608 oldMap = NULL;␊
609 ␊
610 int dev = selectAlternateBootDevice(gBIOSDev);␊
611 ␊
612 BVRef bvchain = scanBootVolumes(dev, 0);␊
613 BVRef bootVol = selectBootVolume(bvchain);␊
614 gBootVolume = bootVol;␊
615 setRootVolume(bootVol);␊
616 gBIOSDev = dev;␊
617 }␊
618 */␊
619␊
620static bool getOSVersion(char *str)␊
621{␊
622␉bool valid = false;␊
623␉config_file_t systemVersion;␊
624␉const char *val;␊
625␉int len;␊
626␉␊
627␉if (!loadConfigFile("System/Library/CoreServices/SystemVersion.plist", &systemVersion))␊
628␉{␊
629␉␉valid = true;␊
630␉}␊
631␉else if (!loadConfigFile("System/Library/CoreServices/ServerVersion.plist", &systemVersion))␊
632␉{␊
633␉␉valid = true;␊
634␉}␊
635␉␊
636␉if (valid)␊
637␉{␊
638␉␉if (getValueForKey(kProductVersion, &val, &len, &systemVersion))␊
639␉␉{␊
640␉␉␉// getValueForKey uses const char for val␊
641␉␉␉// so copy it and trim␊
642␉␉␉*str = '\0';␊
643␉␉␉strncat(str, val, MIN(len, 4));␊
644␉␉}␊
645␉␉else␊
646␉␉␉valid = false;␊
647␉}␊
648␉␊
649␉return valid;␊
650}␊
651␊
652#define BASE 65521L /* largest prime smaller than 65536 */␊
653#define NMAX 5000␊
654// NMAX (was 5521) the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1␊
655␊
656#define DO1(buf,i) {s1 += buf[i]; s2 += s1;}␊
657#define DO2(buf,i) DO1(buf,i); DO1(buf,i+1);␊
658#define DO4(buf,i) DO2(buf,i); DO2(buf,i+2);␊
659#define DO8(buf,i) DO4(buf,i); DO4(buf,i+4);␊
660#define DO16(buf) DO8(buf,0); DO8(buf,8);␊
661␊
662unsigned long Adler32(unsigned char *buf, long len)␊
663{␊
664 unsigned long s1 = 1; // adler & 0xffff;␊
665 unsigned long s2 = 0; // (adler >> 16) & 0xffff;␊
666 unsigned long result;␊
667 int k;␊
668␉␊
669 while (len > 0) {␊
670 k = len < NMAX ? len : NMAX;␊
671 len -= k;␊
672 while (k >= 16) {␊
673 DO16(buf);␊
674 buf += 16;␊
675 k -= 16;␊
676 }␊
677 if (k != 0) do {␊
678 s1 += *buf++;␊
679 s2 += s1;␊
680 } while (--k);␊
681 s1 %= BASE;␊
682 s2 %= BASE;␊
683 }␊
684 result = (s2 << 16) | s1;␊
685 return OSSwapHostToBigInt32(result);␊
686}␊
687

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