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Source at commit 341 created 13 years 8 months ago.
By meklort, Updates module code, dependencies now work correctly. Added KernelPatcher module (currently doesn't hook in anywhere). I need to fix the module loader so that the kernel patcher module loads / starts correctly.
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 // Jump to kernel's entry point. There's no going back now.␊
202 startprog( kernelEntry, bootArgs );␊
203␊
204 // Not reached␊
205␊
206 return 0;␊
207}␊
208␊
209//==========================================================================␊
210// This is the entrypoint from real-mode which functions exactly as it did␊
211// before. Multiboot does its own runtime initialization, does some of its␊
212// own things, and then calls common_boot.␊
213void boot(int biosdev)␊
214{␊
215␉initialize_runtime();␊
216␉// Enable A20 gate before accessing memory above 1Mb.␊
217␉enableA20();␊
218␉common_boot(biosdev);␊
219}␊
220␊
221//==========================================================================␊
222// The 'main' function for the booter. Called by boot0 when booting␊
223// from a block device, or by the network booter.␊
224//␊
225// arguments:␊
226// biosdev - Value passed from boot1/NBP to specify the device␊
227// that the booter was loaded from.␊
228//␊
229// If biosdev is kBIOSDevNetwork, then this function will return if␊
230// booting was unsuccessful. This allows the PXE firmware to try the␊
231// next boot device on its list.␊
232void common_boot(int biosdev)␊
233{␊
234 int status;␊
235 char *bootFile;␊
236 unsigned long adler32;␊
237 bool quiet;␊
238 bool firstRun = true;␊
239 bool instantMenu;␊
240 bool rescanPrompt;␊
241 unsigned int allowBVFlags = kBVFlagSystemVolume|kBVFlagForeignBoot;␊
242 unsigned int denyBVFlags = kBVFlagEFISystem;␊
243␊
244 // Set reminder to unload the PXE base code. Neglect to unload␊
245 // the base code will result in a hang or kernel panic.␊
246 gUnloadPXEOnExit = true;␊
247␊
248 // Record the device that the booter was loaded from.␊
249 gBIOSDev = biosdev & kBIOSDevMask;␊
250␊
251 // Initialize boot info structure.␊
252 initKernBootStruct();␊
253␊
254 // Setup VGA text mode.␊
255 // Not sure if it is safe to call setVideoMode() before the␊
256 // config table has been loaded. Call video_mode() instead.␊
257#if DEBUG␊
258 printf("before video_mode\n");␊
259#endif␊
260 video_mode( 2 ); // 80x25 mono text mode.␊
261#if DEBUG␊
262 printf("after video_mode\n");␊
263#endif␊
264␊
265 // Scan and record the system's hardware information.␊
266 scan_platform();␊
267␊
268 // First get info for boot volume.␊
269 scanBootVolumes(gBIOSDev, 0);␊
270 bvChain = getBVChainForBIOSDev(gBIOSDev);␊
271 setBootGlobals(bvChain);␊
272 ␊
273 // Load boot.plist config file␊
274 status = loadSystemConfig(&bootInfo->bootConfig);␊
275␊
276 if (getBoolForKey(kQuietBootKey, &quiet, &bootInfo->bootConfig) && quiet) {␊
277 gBootMode |= kBootModeQuiet;␊
278 }␊
279␊
280 // Override firstRun to get to the boot menu instantly by setting "Instant Menu"=y in system config␊
281 if (getBoolForKey(kInsantMenuKey, &instantMenu, &bootInfo->bootConfig) && instantMenu) {␊
282 firstRun = false;␊
283 }␊
284␊
285 // Loading preboot ramdisk if exists.␊
286 loadPrebootRAMDisk();␊
287␊
288␉// Intialize module system␊
289␉load_module(SYMBOLS_MODULE);␊
290␉lookup_symbol = (void*)lookup_all_symbols("_lookup_symbol");␊
291␉␊
292␉// Load a module␊
293␉load_module("KernelPatcher");␊
294␉␊
295 // Disable rescan option by default␊
296 gEnableCDROMRescan = false;␊
297␊
298 // Enable it with Rescan=y in system config␊
299 if (getBoolForKey(kRescanKey, &gEnableCDROMRescan, &bootInfo->bootConfig) && gEnableCDROMRescan) {␊
300 gEnableCDROMRescan = true;␊
301 }␊
302␊
303 // Ask the user for Rescan option by setting "Rescan Prompt"=y in system config.␊
304 rescanPrompt = false;␊
305 if (getBoolForKey(kRescanPromptKey, &rescanPrompt , &bootInfo->bootConfig) && rescanPrompt && biosDevIsCDROM(gBIOSDev)) {␊
306 gEnableCDROMRescan = promptForRescanOption();␊
307 }␊
308␊
309 // Enable touching a single BIOS device only if "Scan Single Drive"=y is set in system config.␊
310 if (getBoolForKey(kScanSingleDriveKey, &gScanSingleDrive, &bootInfo->bootConfig) && gScanSingleDrive) {␊
311 gScanSingleDrive = true;␊
312 }␊
313␊
314 // Create a list of partitions on device(s).␊
315 if (gScanSingleDrive) {␊
316 scanBootVolumes(gBIOSDev, &bvCount);␊
317 } else {␊
318 scanDisks(gBIOSDev, &bvCount);␊
319 }␊
320␊
321 // Create a separated bvr chain using the specified filters.␊
322 bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
323␊
324 gBootVolume = selectBootVolume(bvChain);␊
325␊
326#if DEBUG␊
327 printf(" Default: %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBootVolume, gBootVolume->biosdev, gBootVolume->part_no, gBootVolume->flags);␊
328 printf(" bt(0,0): %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBIOSBootVolume, gBIOSBootVolume->biosdev, gBIOSBootVolume->part_no, gBIOSBootVolume->flags);␊
329 getc();␊
330#endif␊
331␊
332 useGUI = true;␊
333 // Override useGUI default␊
334 getBoolForKey(kGUIKey, &useGUI, &bootInfo->bootConfig);␊
335 if (useGUI) {␊
336␉␉patchVideoBios();␊
337 /* XXX AsereBLN handle error */␊
338␉␉initGUI();␊
339 }␊
340␊
341 setBootGlobals(bvChain);␊
342␊
343 // Parse args, load and start kernel.␊
344 while (1) {␊
345 const char *val;␊
346 int len;␊
347 int trycache;␊
348 long flags, cachetime, kerneltime, exttime, sleeptime, time;␊
349 int ret = -1;␊
350 void *binary = (void *)kLoadAddr;␊
351 bool tryresume;␊
352 bool tryresumedefault;␊
353 bool forceresume;␊
354␊
355 config_file_t systemVersion;␉␉// system.plist of booting partition␊
356␊
357 // additional variable for testing alternate kernel image locations on boot helper partitions.␊
358 char bootFileSpec[512];␊
359␉␉␊
360 // Initialize globals.␊
361␊
362 sysConfigValid = false;␊
363 gErrors = false;␊
364␊
365 status = getBootOptions(firstRun);␊
366 firstRun = false;␊
367 if (status == -1) continue;␊
368␉␉ ␊
369 status = processBootOptions();␊
370 // Status==1 means to chainboot␊
371 if ( status == 1 ) break;␊
372 // Status==-1 means that the config file couldn't be loaded or that gBootVolume is NULL␊
373 if ( status == -1 )␊
374 {␊
375 // gBootVolume == NULL usually means the user hit escape.␊
376 if(gBootVolume == NULL)␊
377 {␊
378 freeFilteredBVChain(bvChain);␊
379␊
380 if (gEnableCDROMRescan)␊
381 rescanBIOSDevice(gBIOSDev);␊
382 ␊
383 bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
384 setBootGlobals(bvChain);␊
385 }␊
386 continue;␊
387 }␊
388␉␉␊
389 // Other status (e.g. 0) means that we should proceed with boot.␊
390␉␉␊
391␉␉if( bootArgs->Video.v_display == GRAPHICS_MODE )␊
392␉␉␉drawBackground();␊
393␉␉␉␊
394 // Found and loaded a config file. Proceed with boot.␊
395␊
396␉␉// Turn off any GUI elements␊
397␉␉if( bootArgs->Video.v_display == GRAPHICS_MODE )␊
398␉␉{␊
399␉␉␉gui.devicelist.draw = false;␊
400␉␉␉gui.bootprompt.draw = false;␊
401␉␉␉gui.menu.draw = false;␊
402␉␉␉gui.infobox.draw = false;␊
403␉␉␉drawBackground();␊
404␉␉␉updateVRAM();␊
405␉␉}␊
406␉␉␊
407␉␉// Find out which version mac os we're booting.␊
408␉␉if (!loadConfigFile("System/Library/CoreServices/SystemVersion.plist", &systemVersion)) {␊
409␉␉␉if (getValueForKey(kProductVersion, &val, &len, &systemVersion)) {␉␊
410␉␉␉␉// getValueForKey uses const char for val␊
411␉␉␉␉// so copy it and trim␊
412␉␉␉␉strncpy(gMacOSVersion, val, MIN(len, 4));␊
413␉␉␉␉gMacOSVersion[MIN(len, 4)] = '\0';␊
414␉␉␉}␊
415␉␉}␊
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␉␉if (getValueForKey(k32BitModeFlag, &val, &len, &bootInfo->bootConfig)) {␊
428␉␉␉archCpuType = CPU_TYPE_I386;␊
429␉␉}␊
430␉␉␊
431␉␉if (!getBoolForKey (kWake, &tryresume, &bootInfo->bootConfig)) {␊
432␉␉␉tryresume = true;␊
433␉␉␉tryresumedefault = true;␊
434␉␉} else {␊
435␉␉␉tryresumedefault = false;␊
436␉␉}␊
437␊
438␉␉if (!getBoolForKey (kForceWake, &forceresume, &bootInfo->bootConfig)) {␊
439␉␉␉forceresume = false;␊
440␉␉}␊
441␉␉␊
442␉␉if (forceresume) {␊
443␉␉␉tryresume = true;␊
444␉␉␉tryresumedefault = false;␊
445␉␉}␊
446␉␉␊
447␉␉while (tryresume) {␊
448␉␉␉const char *tmp;␊
449␉␉␉BVRef bvr;␊
450␉␉␉if (!getValueForKey(kWakeImage, &val, &len, &bootInfo->bootConfig))␊
451␉␉␉␉val="/private/var/vm/sleepimage";␊
452␉␉␉␊
453␉␉␉// Do this first to be sure that root volume is mounted␊
454␉␉␉ret = GetFileInfo(0, val, &flags, &sleeptime);␊
455␊
456␉␉␉if ((bvr = getBootVolumeRef(val, &tmp)) == NULL)␊
457␉␉␉␉break;␊
458␉␉␉␊
459␉␉␉// Can't check if it was hibernation Wake=y is required␊
460␉␉␉if (bvr->modTime == 0 && tryresumedefault)␊
461␉␉␉␉break;␊
462␉␉␉␊
463␉␉␉if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat))␊
464␉␉␉␉break;␊
465␉␉␉␊
466␉␉␉if (!forceresume && ((sleeptime+3)<bvr->modTime)) {␊
467␉␉␉␉printf ("Hibernate image is too old by %d seconds. Use ForceWake=y to override\n",bvr->modTime-sleeptime);␊
468␉␉␉␉break;␊
469␉␉␉}␊
470␉␉␉␉␊
471␉␉␉HibernateBoot((char *)val);␊
472␉␉␉break;␊
473␉␉}␊
474␊
475 // Reset cache name.␊
476 bzero(gCacheNameAdler + 64, sizeof(gCacheNameAdler) - 64);␊
477␊
478 sprintf(gCacheNameAdler + 64, "%s,%s", gRootDevice, bootInfo->bootFile);␊
479␊
480 adler32 = Adler32((unsigned char *)gCacheNameAdler, sizeof(gCacheNameAdler));␊
481␊
482 if (getValueForKey(kKernelCacheKey, &val, &len, &bootInfo->bootConfig)) {␊
483 strlcpy(gBootKernelCacheFile, val, len+1);␊
484 } else {␊
485 sprintf(gBootKernelCacheFile, "%s.%08lX", kDefaultCachePath, adler32);␊
486 }␊
487␊
488 // Check for cache file.␊
489 trycache = (((gBootMode & kBootModeSafe) == 0) &&␊
490 !gOverrideKernel &&␊
491 (gBootFileType == kBlockDeviceType) &&␊
492 (gMKextName[0] == '\0') &&␊
493 (gBootKernelCacheFile[0] != '\0'));␊
494␊
495␉␉verbose("Loading Darwin %s\n", gMacOSVersion);␊
496␉␉␊
497 if (trycache) do {␊
498 ␊
499 // if we haven't found the kernel yet, don't use the cache␊
500 ret = GetFileInfo(NULL, bootInfo->bootFile, &flags, &kerneltime);␊
501 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)) {␊
502 trycache = 0;␊
503 break;␊
504 }␊
505 ret = GetFileInfo(NULL, gBootKernelCacheFile, &flags, &cachetime);␊
506 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)␊
507 || (cachetime < kerneltime)) {␊
508 trycache = 0;␊
509 break;␊
510 }␊
511 ret = GetFileInfo("/System/Library/", "Extensions", &flags, &exttime);␊
512 if ((ret == 0) && ((flags & kFileTypeMask) == kFileTypeDirectory)␊
513 && (cachetime < exttime)) {␊
514 trycache = 0;␊
515 break;␊
516 }␊
517 if (kerneltime > exttime) {␊
518 exttime = kerneltime;␊
519 }␊
520 if (cachetime != (exttime + 1)) {␊
521 trycache = 0;␊
522 break;␊
523 }␊
524 } while (0);␊
525␊
526 do {␊
527 if (trycache) {␊
528 bootFile = gBootKernelCacheFile;␊
529 verbose("Loading kernel cache %s\n", bootFile);␊
530 ret = LoadFile(bootFile);␊
531 binary = (void *)kLoadAddr;␊
532 if (ret >= 0) {␊
533 break;␊
534 }␊
535 }␊
536 bootFile = bootInfo->bootFile;␊
537␊
538 // Try to load kernel image from alternate locations on boot helper partitions.␊
539 sprintf(bootFileSpec, "com.apple.boot.P/%s", bootFile);␊
540 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
541 ␉ ␉ if (ret == -1)␊
542 ␉ ␉ {␊
543 sprintf(bootFileSpec, "com.apple.boot.R/%s", bootFile);␊
544 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
545 if (ret == -1)␊
546 {␊
547 sprintf(bootFileSpec, "com.apple.boot.S/%s", bootFile);␊
548 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
549 if (ret == -1)␊
550 {␊
551 // Not found any alternate locations, using the original kernel image path.␊
552 strcpy(bootFileSpec, bootFile);␊
553 }␊
554 }␊
555 }␊
556 ␉␉␉␊
557 verbose("Loading kernel %s\n", bootFileSpec);␊
558 ret = LoadThinFatFile(bootFileSpec, &binary);␊
559 if (ret <= 0 && archCpuType == CPU_TYPE_X86_64)␊
560 {␊
561 archCpuType = CPU_TYPE_I386;␊
562 ret = LoadThinFatFile(bootFileSpec, &binary);␉␉␉␉␊
563 }␊
564␉␉␉␊
565 } while (0);␊
566␊
567 clearActivityIndicator();␊
568#if DEBUG␊
569 printf("Pausing...");␊
570 sleep(8);␊
571#endif␊
572␊
573 if (ret <= 0) {␊
574␉␉␉printf("Can't find %s\n", bootFile);␊
575␊
576␉␉␉if(gui.initialised) {␊
577␉␉␉␉sleep(1);␊
578␉␉␉␉drawBackground();␊
579␉␉␉␉gui.devicelist.draw = true;␊
580␉␉␉␉gui.redraw = true;␊
581␉␉␉}␊
582 if (gBootFileType == kNetworkDeviceType) {␊
583 // Return control back to PXE. Don't unload PXE base code.␊
584 gUnloadPXEOnExit = false;␊
585 break;␊
586 }␊
587 } else {␊
588 /* Won't return if successful. */␊
589 ret = ExecKernel(binary);␊
590 }␊
591 }␊
592 ␊
593 // chainboot␊
594 if (status==1) {␊
595␉if (getVideoMode() == GRAPHICS_MODE) {␉// if we are already in graphics-mode,␊
596␉␉setVideoMode(VGA_TEXT_MODE, 0);␉// switch back to text mode␊
597␉}␊
598 }␊
599␉␊
600 if ((gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit) {␊
601␉nbpUnloadBaseCode();␊
602 }␊
603}␊
604␊
605/*!␊
606 Selects a new BIOS device, taking care to update the global state appropriately.␊
607 */␊
608/*␊
609static void selectBiosDevice(void)␊
610{␊
611 struct DiskBVMap *oldMap = diskResetBootVolumes(gBIOSDev);␊
612 CacheReset();␊
613 diskFreeMap(oldMap);␊
614 oldMap = NULL;␊
615␊
616 int dev = selectAlternateBootDevice(gBIOSDev);␊
617␊
618 BVRef bvchain = scanBootVolumes(dev, 0);␊
619 BVRef bootVol = selectBootVolume(bvchain);␊
620 gBootVolume = bootVol;␊
621 setRootVolume(bootVol);␊
622 gBIOSDev = dev;␊
623}␊
624*/␊
625␊
626#define BASE 65521L /* largest prime smaller than 65536 */␊
627#define NMAX 5000␊
628// NMAX (was 5521) the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1␊
629␊
630#define DO1(buf,i) {s1 += buf[i]; s2 += s1;}␊
631#define DO2(buf,i) DO1(buf,i); DO1(buf,i+1);␊
632#define DO4(buf,i) DO2(buf,i); DO2(buf,i+2);␊
633#define DO8(buf,i) DO4(buf,i); DO4(buf,i+4);␊
634#define DO16(buf) DO8(buf,0); DO8(buf,8);␊
635␊
636unsigned long Adler32(unsigned char *buf, long len)␊
637{␊
638 unsigned long s1 = 1; // adler & 0xffff;␊
639 unsigned long s2 = 0; // (adler >> 16) & 0xffff;␊
640 unsigned long result;␊
641 int k;␊
642␊
643 while (len > 0) {␊
644 k = len < NMAX ? len : NMAX;␊
645 len -= k;␊
646 while (k >= 16) {␊
647 DO16(buf);␊
648 buf += 16;␊
649 k -= 16;␊
650 }␊
651 if (k != 0) do {␊
652 s1 += *buf++;␊
653 s2 += s1;␊
654 } while (--k);␊
655 s1 %= BASE;␊
656 s2 %= BASE;␊
657 }␊
658 result = (s2 << 16) | s1;␊
659 return OSSwapHostToBigInt32(result);␊
660}␊
661

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