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Source at commit 502 created 13 years 7 months ago.
By meklort, Typo fix, current status of kernel patcher. NOTE: 64bit doesn't work fully yet. This is just a placeholder untill I sync with trunk.
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);␊
88␊
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 verbose("Starting Darwin %s\n",( archCpuType == CPU_TYPE_I386 ) ? "x86" : "x86_64");␊
172␊
173 // Cleanup the PXE base code.␊
174␊
175 if ( (gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit ) {␊
176␉␉if ( (ret = nbpUnloadBaseCode()) != nbpStatusSuccess )␊
177 {␊
178 ␉printf("nbpUnloadBaseCode error %d\n", (int) ret);␊
179 sleep(2);␊
180 }␊
181 }␊
182␊
183 bool dummyVal;␊
184 if (getBoolForKey(kWaitForKeypressKey, &dummyVal, &bootInfo->bootConfig) && dummyVal) {␊
185␉printf("Press any key to continue...");␊
186␉getc();␊
187 }␊
188␊
189 // If we were in text mode, switch to graphics mode.␊
190 // This will draw the boot graphics unless we are in␊
191 // verbose mode.␊
192␊
193 if(gVerboseMode)␊
194 setVideoMode( GRAPHICS_MODE, 0 );␊
195 else␊
196 drawBootGraphics();␊
197␉␊
198 finalizeBootStruct();␊
199 ␊
200␉usb_loop();␊
201␉␊
202␉execute_hook("Kernel Start", (void*)kernelEntry, (void*)bootArgs, NULL, NULL);␉// Notify modules that the kernel is about to be started␊
203␊
204␉// Jump to kernel's entry point. There's no going back now.␊
205 startprog( kernelEntry, bootArgs );␊
206␊
207 // Not reached␊
208␊
209 return 0;␊
210}␊
211␊
212//==========================================================================␊
213// This is the entrypoint from real-mode which functions exactly as it did␊
214// before. Multiboot does its own runtime initialization, does some of its␊
215// own things, and then calls common_boot.␊
216void boot(int biosdev)␊
217{␊
218␉initialize_runtime();␊
219␉// Enable A20 gate before accessing memory above 1Mb.␊
220␉enableA20();␊
221␉common_boot(biosdev);␊
222}␊
223␊
224//==========================================================================␊
225// The 'main' function for the booter. Called by boot0 when booting␊
226// from a block device, or by the network booter.␊
227//␊
228// arguments:␊
229// biosdev - Value passed from boot1/NBP to specify the device␊
230// that the booter was loaded from.␊
231//␊
232// If biosdev is kBIOSDevNetwork, then this function will return if␊
233// booting was unsuccessful. This allows the PXE firmware to try the␊
234// next boot device on its list.␊
235void common_boot(int biosdev)␊
236{␊
237 int status;␊
238 char *bootFile;␊
239 unsigned long adler32;␊
240 bool quiet;␊
241 bool firstRun = true;␊
242 bool instantMenu;␊
243 bool rescanPrompt;␊
244 unsigned int allowBVFlags = kBVFlagSystemVolume|kBVFlagForeignBoot;␊
245 unsigned int denyBVFlags = kBVFlagEFISystem;␊
246␊
247 // Set reminder to unload the PXE base code. Neglect to unload␊
248 // the base code will result in a hang or kernel panic.␊
249 gUnloadPXEOnExit = true;␊
250␊
251 // Record the device that the booter was loaded from.␊
252 gBIOSDev = biosdev & kBIOSDevMask;␊
253␊
254 // Initialize boot info structure.␊
255 initKernBootStruct();␊
256␊
257 // Setup VGA text mode.␊
258 // Not sure if it is safe to call setVideoMode() before the␊
259 // config table has been loaded. Call video_mode() instead.␊
260#if DEBUG␊
261 printf("before video_mode\n");␊
262#endif␊
263 video_mode( 2 ); // 80x25 mono text mode.␊
264#if DEBUG␊
265 printf("after video_mode\n");␊
266#endif␊
267␊
268 // Scan and record the system's hardware information.␊
269 scan_platform();␊
270␊
271 // First get info for boot volume.␊
272 scanBootVolumes(gBIOSDev, 0);␊
273 bvChain = getBVChainForBIOSDev(gBIOSDev);␊
274 setBootGlobals(bvChain);␊
275 ␊
276 // Load boot.plist config file␊
277 status = loadSystemConfig(&bootInfo->bootConfig);␊
278␊
279 if (getBoolForKey(kQuietBootKey, &quiet, &bootInfo->bootConfig) && quiet) {␊
280 gBootMode |= kBootModeQuiet;␊
281 }␊
282␊
283 // Override firstRun to get to the boot menu instantly by setting "Instant Menu"=y in system config␊
284 if (getBoolForKey(kInsantMenuKey, &instantMenu, &bootInfo->bootConfig) && instantMenu) {␊
285 firstRun = false;␊
286 }␊
287␊
288␉// Intialize module system␊
289␉if(init_module_system())␊
290␉{␊
291␉␉load_all_modules();␊
292␉}␊
293␉␊
294␉␊
295␉␊
296 // Loading preboot ramdisk if exists.␊
297 loadPrebootRAMDisk();␊
298␉␉␊
299 // Disable rescan option by default␊
300 gEnableCDROMRescan = false;␊
301␊
302 // Enable it with Rescan=y in system config␊
303 if (getBoolForKey(kRescanKey, &gEnableCDROMRescan, &bootInfo->bootConfig) && gEnableCDROMRescan) {␊
304 gEnableCDROMRescan = true;␊
305 }␊
306␊
307 // Ask the user for Rescan option by setting "Rescan Prompt"=y in system config.␊
308 rescanPrompt = false;␊
309 if (getBoolForKey(kRescanPromptKey, &rescanPrompt , &bootInfo->bootConfig) && rescanPrompt && biosDevIsCDROM(gBIOSDev)) {␊
310 gEnableCDROMRescan = promptForRescanOption();␊
311 }␊
312␊
313 // Enable touching a single BIOS device only if "Scan Single Drive"=y is set in system config.␊
314 if (getBoolForKey(kScanSingleDriveKey, &gScanSingleDrive, &bootInfo->bootConfig) && gScanSingleDrive) {␊
315 gScanSingleDrive = true;␊
316 }␊
317␊
318 // Create a list of partitions on device(s).␊
319 if (gScanSingleDrive) {␊
320 scanBootVolumes(gBIOSDev, &bvCount);␊
321 } else {␊
322 scanDisks(gBIOSDev, &bvCount);␊
323 }␊
324␊
325 // Create a separated bvr chain using the specified filters.␊
326 bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
327␊
328 gBootVolume = selectBootVolume(bvChain);␊
329␊
330#if DEBUG␊
331 printf(" Default: %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBootVolume, gBootVolume->biosdev, gBootVolume->part_no, gBootVolume->flags);␊
332 printf(" bt(0,0): %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBIOSBootVolume, gBIOSBootVolume->biosdev, gBIOSBootVolume->part_no, gBIOSBootVolume->flags);␊
333 getc();␊
334#endif␊
335␊
336 useGUI = true;␊
337 // Override useGUI default␊
338 getBoolForKey(kGUIKey, &useGUI, &bootInfo->bootConfig);␊
339 if (useGUI) {␊
340␉␉patchVideoBios();␊
341 /* XXX AsereBLN handle error */␊
342␉␉initGUI();␊
343 }␊
344␊
345 setBootGlobals(bvChain);␊
346␊
347 // Parse args, load and start kernel.␊
348 while (1) {␊
349 const char *val;␊
350 int len;␊
351 int trycache;␊
352 long flags, cachetime, kerneltime, exttime, sleeptime, time;␊
353 int ret = -1;␊
354 void *binary = (void *)kLoadAddr;␊
355 bool tryresume;␊
356 bool tryresumedefault;␊
357 bool forceresume;␊
358␊
359 config_file_t systemVersion;␉␉// system.plist of booting partition␊
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 // Other status (e.g. 0) means that we should proceed with boot.␊
394␉␉␊
395␉␉if( bootArgs->Video.v_display == GRAPHICS_MODE )␊
396␉␉␉drawBackground();␊
397␉␉␉␊
398 // Found and loaded a config file. Proceed with boot.␊
399␊
400␉␉// Turn off any GUI elements␊
401␉␉if( bootArgs->Video.v_display == GRAPHICS_MODE )␊
402␉␉{␊
403␉␉␉gui.devicelist.draw = false;␊
404␉␉␉gui.bootprompt.draw = false;␊
405␉␉␉gui.menu.draw = false;␊
406␉␉␉gui.infobox.draw = false;␊
407␉␉␉drawBackground();␊
408␉␉␉updateVRAM();␊
409␉␉}␊
410␉␉␊
411␉␉// Find out which version mac os we're booting.␊
412␉␉if (!loadConfigFile("System/Library/CoreServices/SystemVersion.plist", &systemVersion)) {␊
413␉␉␉if (getValueForKey(kProductVersion, &val, &len, &systemVersion)) {␉␊
414␉␉␉␉// getValueForKey uses const char for val␊
415␉␉␉␉// so copy it and trim␊
416␉␉␉␉strncpy(gMacOSVersion, val, MIN(len, 4));␊
417␉␉␉␉gMacOSVersion[MIN(len, 4)] = '\0';␊
418␉␉␉}␊
419␉␉}␊
420␊
421␉␉if (platformCPUFeature(CPU_FEATURE_EM64T)) {␊
422␉␉␉archCpuType = CPU_TYPE_X86_64;␊
423␉␉} else {␊
424␉␉␉archCpuType = CPU_TYPE_I386;␊
425␉␉}␊
426␉␉if (getValueForKey(karch, &val, &len, &bootInfo->bootConfig)) {␊
427␉␉␉if (strncmp(val, "i386", 4) == 0) {␊
428␉␉␉␉archCpuType = CPU_TYPE_I386;␊
429␉␉␉}␊
430␉␉}␊
431␉␉if (getValueForKey(k32BitModeFlag, &val, &len, &bootInfo->bootConfig)) {␊
432␉␉␉archCpuType = CPU_TYPE_I386;␊
433␉␉}␊
434␉␉␊
435␉␉if (!getBoolForKey (kWake, &tryresume, &bootInfo->bootConfig)) {␊
436␉␉␉tryresume = true;␊
437␉␉␉tryresumedefault = true;␊
438␉␉} else {␊
439␉␉␉tryresumedefault = false;␊
440␉␉}␊
441␊
442␉␉if (!getBoolForKey (kForceWake, &forceresume, &bootInfo->bootConfig)) {␊
443␉␉␉forceresume = false;␊
444␉␉}␊
445␉␉␊
446␉␉if (forceresume) {␊
447␉␉␉tryresume = true;␊
448␉␉␉tryresumedefault = false;␊
449␉␉}␊
450␉␉␊
451␉␉while (tryresume) {␊
452␉␉␉const char *tmp;␊
453␉␉␉BVRef bvr;␊
454␉␉␉if (!getValueForKey(kWakeImage, &val, &len, &bootInfo->bootConfig))␊
455␉␉␉␉val="/private/var/vm/sleepimage";␊
456␉␉␉␊
457␉␉␉// Do this first to be sure that root volume is mounted␊
458␉␉␉ret = GetFileInfo(0, val, &flags, &sleeptime);␊
459␊
460␉␉␉if ((bvr = getBootVolumeRef(val, &tmp)) == NULL)␊
461␉␉␉␉break;␊
462␉␉␉␊
463␉␉␉// Can't check if it was hibernation Wake=y is required␊
464␉␉␉if (bvr->modTime == 0 && tryresumedefault)␊
465␉␉␉␉break;␊
466␉␉␉␊
467␉␉␉if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat))␊
468␉␉␉␉break;␊
469␉␉␉␊
470␉␉␉if (!forceresume && ((sleeptime+3)<bvr->modTime)) {␊
471␉␉␉␉printf ("Hibernate image is too old by %d seconds. Use ForceWake=y to override\n",bvr->modTime-sleeptime);␊
472␉␉␉␉break;␊
473␉␉␉}␊
474␉␉␉␉␊
475␉␉␉HibernateBoot((char *)val);␊
476␉␉␉break;␊
477␉␉}␊
478␊
479 // Reset cache name.␊
480 bzero(gCacheNameAdler + 64, sizeof(gCacheNameAdler) - 64);␊
481␊
482 sprintf(gCacheNameAdler + 64, "%s,%s", gRootDevice, bootInfo->bootFile);␊
483␊
484 adler32 = Adler32((unsigned char *)gCacheNameAdler, sizeof(gCacheNameAdler));␊
485␊
486 if (getValueForKey(kKernelCacheKey, &val, &len, &bootInfo->bootConfig)) {␊
487 strlcpy(gBootKernelCacheFile, val, len+1);␊
488 } else {␊
489 sprintf(gBootKernelCacheFile, "%s.%08lX", kDefaultCachePath, adler32);␊
490 }␊
491␊
492 // Check for cache file.␊
493 trycache = (((gBootMode & kBootModeSafe) == 0) &&␊
494 !gOverrideKernel &&␊
495 (gBootFileType == kBlockDeviceType) &&␊
496 (gMKextName[0] == '\0') &&␊
497 (gBootKernelCacheFile[0] != '\0'));␊
498␊
499␉␉verbose("Loading Darwin %s\n", gMacOSVersion);␊
500␉␉␊
501 if (trycache) do {␊
502 ␊
503 // if we haven't found the kernel yet, don't use the cache␊
504 ret = GetFileInfo(NULL, bootInfo->bootFile, &flags, &kerneltime);␊
505 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)) {␊
506 trycache = 0;␊
507 break;␊
508 }␊
509 ret = GetFileInfo(NULL, gBootKernelCacheFile, &flags, &cachetime);␊
510 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)␊
511 || (cachetime < kerneltime)) {␊
512 trycache = 0;␊
513 break;␊
514 }␊
515 ret = GetFileInfo("/System/Library/", "Extensions", &flags, &exttime);␊
516 if ((ret == 0) && ((flags & kFileTypeMask) == kFileTypeDirectory)␊
517 && (cachetime < exttime)) {␊
518 trycache = 0;␊
519 break;␊
520 }␊
521 if (kerneltime > exttime) {␊
522 exttime = kerneltime;␊
523 }␊
524 if (cachetime != (exttime + 1)) {␊
525 trycache = 0;␊
526 break;␊
527 }␊
528 } while (0);␊
529␊
530 do {␊
531 if (trycache) {␊
532 bootFile = gBootKernelCacheFile;␊
533 verbose("Loading kernel cache %s\n", bootFile);␊
534 ret = LoadFile(bootFile);␊
535 binary = (void *)kLoadAddr;␊
536 if (ret >= 0) {␊
537 break;␊
538 }␊
539 }␊
540 bootFile = bootInfo->bootFile;␊
541␊
542 // Try to load kernel image from alternate locations on boot helper partitions.␊
543 sprintf(bootFileSpec, "com.apple.boot.P/%s", bootFile);␊
544 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
545 ␉ ␉ if (ret == -1)␊
546 ␉ ␉ {␊
547 sprintf(bootFileSpec, "com.apple.boot.R/%s", bootFile);␊
548 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
549 if (ret == -1)␊
550 {␊
551 sprintf(bootFileSpec, "com.apple.boot.S/%s", bootFile);␊
552 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
553 if (ret == -1)␊
554 {␊
555 // Not found any alternate locations, using the original kernel image path.␊
556 strcpy(bootFileSpec, bootFile);␊
557 }␊
558 }␊
559 }␊
560 ␉␉␉␊
561 verbose("Loading kernel %s\n", bootFileSpec);␊
562 ret = LoadThinFatFile(bootFileSpec, &binary);␊
563 if (ret <= 0 && archCpuType == CPU_TYPE_X86_64)␊
564 {␊
565 archCpuType = CPU_TYPE_I386;␊
566 ret = LoadThinFatFile(bootFileSpec, &binary);␉␉␉␉␊
567 }␊
568␉␉␉␊
569 } while (0);␊
570␊
571 clearActivityIndicator();␊
572#if DEBUG␊
573 printf("Pausing...");␊
574 sleep(8);␊
575#endif␊
576␊
577 if (ret <= 0) {␊
578␉␉␉printf("Can't find %s\n", bootFile);␊
579␊
580␉␉␉if(gui.initialised) {␊
581␉␉␉␉sleep(1);␊
582␉␉␉␉drawBackground();␊
583␉␉␉␉gui.devicelist.draw = true;␊
584␉␉␉␉gui.redraw = true;␊
585␉␉␉}␊
586 if (gBootFileType == kNetworkDeviceType) {␊
587 // Return control back to PXE. Don't unload PXE base code.␊
588 gUnloadPXEOnExit = false;␊
589 break;␊
590 }␊
591 } else {␊
592 /* Won't return if successful. */␊
593␉␉␉// Notify modules that ExecKernel is about to be called␊
594␉␉␉execute_hook("ExecKernel", binary, NULL, NULL, NULL);␊
595 ret = ExecKernel(binary);␊
596 }␊
597 }␊
598 ␊
599 // chainboot␊
600 if (status==1) {␊
601␉if (getVideoMode() == GRAPHICS_MODE) {␉// if we are already in graphics-mode,␊
602␉␉setVideoMode(VGA_TEXT_MODE, 0);␉// switch back to text mode␊
603␉}␊
604 }␊
605␉␊
606 if ((gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit) {␊
607␉nbpUnloadBaseCode();␊
608 }␊
609}␊
610␊
611/*!␊
612 Selects a new BIOS device, taking care to update the global state appropriately.␊
613 */␊
614/*␊
615static void selectBiosDevice(void)␊
616{␊
617 struct DiskBVMap *oldMap = diskResetBootVolumes(gBIOSDev);␊
618 CacheReset();␊
619 diskFreeMap(oldMap);␊
620 oldMap = NULL;␊
621␊
622 int dev = selectAlternateBootDevice(gBIOSDev);␊
623␊
624 BVRef bvchain = scanBootVolumes(dev, 0);␊
625 BVRef bootVol = selectBootVolume(bvchain);␊
626 gBootVolume = bootVol;␊
627 setRootVolume(bootVol);␊
628 gBIOSDev = dev;␊
629}␊
630*/␊
631␊
632#define BASE 65521L /* largest prime smaller than 65536 */␊
633#define NMAX 5000␊
634// NMAX (was 5521) the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1␊
635␊
636#define DO1(buf,i) {s1 += buf[i]; s2 += s1;}␊
637#define DO2(buf,i) DO1(buf,i); DO1(buf,i+1);␊
638#define DO4(buf,i) DO2(buf,i); DO2(buf,i+2);␊
639#define DO8(buf,i) DO4(buf,i); DO4(buf,i+4);␊
640#define DO16(buf) DO8(buf,0); DO8(buf,8);␊
641␊
642unsigned long Adler32(unsigned char *buf, long len)␊
643{␊
644 unsigned long s1 = 1; // adler & 0xffff;␊
645 unsigned long s2 = 0; // (adler >> 16) & 0xffff;␊
646 unsigned long result;␊
647 int k;␊
648␊
649 while (len > 0) {␊
650 k = len < NMAX ? len : NMAX;␊
651 len -= k;␊
652 while (k >= 16) {␊
653 DO16(buf);␊
654 buf += 16;␊
655 k -= 16;␊
656 }␊
657 if (k != 0) do {␊
658 s1 += *buf++;␊
659 s2 += s1;␊
660 } while (--k);␊
661 s1 %= BASE;␊
662 s2 %= BASE;␊
663 }␊
664 result = (s2 << 16) | s1;␊
665 return OSSwapHostToBigInt32(result);␊
666}␊
667

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