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Source at commit 284 created 13 years 10 months ago.
By blackosx, Amended my mistake by updating the Default theme images in the trunk. Now put them back as they were.. (Sorry)
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␊
63long gBootMode; /* defaults to 0 == kBootModeNormal */␊
64bool gOverrideKernel;␊
65static char gBootKernelCacheFile[512];␊
66static char gCacheNameAdler[64 + 256];␊
67char *gPlatformName = gCacheNameAdler;␊
68char gRootDevice[512];␊
69char gMKextName[512];␊
70char gMacOSVersion[8];␊
71bool gEnableCDROMRescan;␊
72bool gScanSingleDrive;␊
73␊
74int bvCount = 0;␊
75//int␉menucount = 0;␊
76int gDeviceCount = 0; ␊
77␊
78bool␉recoveryMode = false;␊
79␊
80BVRef bvr;␊
81BVRef menuBVR;␊
82BVRef bvChain;␊
83bool useGUI;␊
84␊
85//static void selectBiosDevice(void);␊
86static unsigned long Adler32(unsigned char *buffer, long length);␊
87␊
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␊
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␊
182 bool dummyVal;␊
183 if (getBoolForKey(kWaitForKeypressKey, &dummyVal, &bootInfo->bootConfig) && dummyVal) {␊
184␉printf("Press any key to continue...");␊
185␉getc();␊
186 }␊
187␊
188 // If we were in text mode, switch to graphics mode.␊
189 // This will draw the boot graphics unless we are in␊
190 // verbose mode.␊
191␊
192 if(gVerboseMode)␊
193 setVideoMode( GRAPHICS_MODE, 0 );␊
194 else␊
195 drawBootGraphics();␊
196␉␊
197 finalizeBootStruct();␊
198 ␊
199␉usb_loop();␊
200 // Jump to kernel's entry point. There's no going back now.␊
201 startprog( kernelEntry, bootArgs );␊
202␊
203 // Not reached␊
204␊
205 return 0;␊
206}␊
207␊
208//==========================================================================␊
209// This is the entrypoint from real-mode which functions exactly as it did␊
210// before. Multiboot does its own runtime initialization, does some of its␊
211// own things, and then calls common_boot.␊
212void boot(int biosdev)␊
213{␊
214␉initialize_runtime();␊
215␉// Enable A20 gate before accessing memory above 1Mb.␊
216␉enableA20();␊
217␉common_boot(biosdev);␊
218}␊
219␊
220//==========================================================================␊
221// The 'main' function for the booter. Called by boot0 when booting␊
222// from a block device, or by the network booter.␊
223//␊
224// arguments:␊
225// biosdev - Value passed from boot1/NBP to specify the device␊
226// that the booter was loaded from.␊
227//␊
228// If biosdev is kBIOSDevNetwork, then this function will return if␊
229// booting was unsuccessful. This allows the PXE firmware to try the␊
230// next boot device on its list.␊
231void common_boot(int biosdev)␊
232{␊
233 int status;␊
234 char *bootFile;␊
235 unsigned long adler32;␊
236 bool quiet;␊
237 bool firstRun = true;␊
238 bool instantMenu;␊
239 bool rescanPrompt;␊
240 unsigned int allowBVFlags = kBVFlagSystemVolume|kBVFlagForeignBoot;␊
241 unsigned int denyBVFlags = kBVFlagEFISystem;␊
242␊
243 // Set reminder to unload the PXE base code. Neglect to unload␊
244 // the base code will result in a hang or kernel panic.␊
245 gUnloadPXEOnExit = true;␊
246␊
247 // Record the device that the booter was loaded from.␊
248 gBIOSDev = biosdev & kBIOSDevMask;␊
249␊
250 // Initialize boot info structure.␊
251 initKernBootStruct();␊
252␊
253 // Setup VGA text mode.␊
254 // Not sure if it is safe to call setVideoMode() before the␊
255 // config table has been loaded. Call video_mode() instead.␊
256#if DEBUG␊
257 printf("before video_mode\n");␊
258#endif␊
259 video_mode( 2 ); // 80x25 mono text mode.␊
260#if DEBUG␊
261 printf("after video_mode\n");␊
262#endif␊
263␊
264 // Scan and record the system's hardware information.␊
265 scan_platform();␊
266␊
267 // First get info for boot volume.␊
268 scanBootVolumes(gBIOSDev, 0);␊
269 bvChain = getBVChainForBIOSDev(gBIOSDev);␊
270 setBootGlobals(bvChain);␊
271 ␊
272 // Load boot.plist config file␊
273 status = loadSystemConfig(&bootInfo->bootConfig);␊
274␊
275 if (getBoolForKey(kQuietBootKey, &quiet, &bootInfo->bootConfig) && quiet) {␊
276 gBootMode |= kBootModeQuiet;␊
277 }␊
278␊
279 // Override firstRun to get to the boot menu instantly by setting "Instant Menu"=y in system config␊
280 if (getBoolForKey(kInsantMenuKey, &instantMenu, &bootInfo->bootConfig) && instantMenu) {␊
281 firstRun = false;␊
282 }␊
283␊
284 // Loading preboot ramdisk if exists.␊
285 loadPrebootRAMDisk();␊
286␊
287 // Disable rescan option by default␊
288 gEnableCDROMRescan = false;␊
289␊
290 // Enable it with Rescan=y in system config␊
291 if (getBoolForKey(kRescanKey, &gEnableCDROMRescan, &bootInfo->bootConfig) && gEnableCDROMRescan) {␊
292 gEnableCDROMRescan = true;␊
293 }␊
294␊
295 // Ask the user for Rescan option by setting "Rescan Prompt"=y in system config.␊
296 rescanPrompt = false;␊
297 if (getBoolForKey(kRescanPromptKey, &rescanPrompt , &bootInfo->bootConfig) && rescanPrompt && biosDevIsCDROM(gBIOSDev)) {␊
298 gEnableCDROMRescan = promptForRescanOption();␊
299 }␊
300␊
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 scanBootVolumes(gBIOSDev, &bvCount);␊
309 } else {␊
310 scanDisks(gBIOSDev, &bvCount);␊
311 }␊
312␊
313 // Create a separated bvr chain using the specified filters.␊
314 bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
315␊
316 gBootVolume = selectBootVolume(bvChain);␊
317␊
318#if DEBUG␊
319 printf(" Default: %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBootVolume, gBootVolume->biosdev, gBootVolume->part_no, gBootVolume->flags);␊
320 printf(" bt(0,0): %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBIOSBootVolume, gBIOSBootVolume->biosdev, gBIOSBootVolume->part_no, gBIOSBootVolume->flags);␊
321 getc();␊
322#endif␊
323␊
324 useGUI = true;␊
325 // Override useGUI default␊
326 getBoolForKey(kGUIKey, &useGUI, &bootInfo->bootConfig);␊
327 if (useGUI) {␊
328␉␉patchVideoBios();␊
329 /* XXX AsereBLN handle error */␊
330␉␉initGUI();␊
331 }␊
332␊
333 setBootGlobals(bvChain);␊
334␊
335 // Parse args, load and start kernel.␊
336 while (1) {␊
337 const char *val;␊
338 int len;␊
339 int trycache;␊
340 long flags, cachetime, kerneltime, exttime, sleeptime, time;␊
341 int ret = -1;␊
342 void *binary = (void *)kLoadAddr;␊
343 bool tryresume;␊
344 bool tryresumedefault;␊
345 bool forceresume;␊
346␊
347 config_file_t systemVersion;␉␉// system.plist of booting partition␊
348␊
349 // additional variable for testing alternate kernel image locations on boot helper partitions.␊
350 char bootFileSpec[512];␊
351␉␉␊
352 // Initialize globals.␊
353␊
354 sysConfigValid = false;␊
355 gErrors = false;␊
356␊
357 status = getBootOptions(firstRun);␊
358 firstRun = false;␊
359 if (status == -1) continue;␊
360␉␉ ␊
361 status = processBootOptions();␊
362 // Status==1 means to chainboot␊
363 if ( status == 1 ) break;␊
364 // Status==-1 means that the config file couldn't be loaded or that gBootVolume is NULL␊
365 if ( status == -1 )␊
366 {␊
367 // gBootVolume == NULL usually means the user hit escape.␊
368 if(gBootVolume == NULL)␊
369 {␊
370 freeFilteredBVChain(bvChain);␊
371␊
372 if (gEnableCDROMRescan)␊
373 rescanBIOSDevice(gBIOSDev);␊
374 ␊
375 bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
376 setBootGlobals(bvChain);␊
377 }␊
378 continue;␊
379 }␊
380␉␉␊
381 // Other status (e.g. 0) means that we should proceed with boot.␊
382␉␉␊
383␉␉if( bootArgs->Video.v_display == GRAPHICS_MODE )␊
384␉␉␉drawBackground();␊
385␉␉␉␊
386 // Found and loaded a config file. Proceed with boot.␊
387␊
388␉␉// Turn off any GUI elements␊
389␉␉if( bootArgs->Video.v_display == GRAPHICS_MODE )␊
390␉␉{␊
391␉␉␉gui.devicelist.draw = false;␊
392␉␉␉gui.bootprompt.draw = false;␊
393␉␉␉gui.menu.draw = false;␊
394␉␉␉gui.infobox.draw = false;␊
395␉␉␉drawBackground();␊
396␉␉␉updateVRAM();␊
397␉␉}␊
398␉␉␊
399␉␉// Find out which version mac os we're booting.␊
400␉␉if (!loadConfigFile("System/Library/CoreServices/SystemVersion.plist", &systemVersion)) {␊
401␉␉␉if (getValueForKey(kProductVersion, &val, &len, &systemVersion)) {␉␊
402␉␉␉␉// getValueForKey uses const char for val␊
403␉␉␉␉// so copy it and trim␊
404␉␉␉␉strncpy(gMacOSVersion, val, MIN(len, 4));␊
405␉␉␉␉gMacOSVersion[MIN(len, 4)] = '\0';␊
406␉␉␉}␊
407␉␉}␊
408␊
409␉␉if (platformCPUFeature(CPU_FEATURE_EM64T)) {␊
410␉␉␉archCpuType = CPU_TYPE_X86_64;␊
411␉␉} else {␊
412␉␉␉archCpuType = CPU_TYPE_I386;␊
413␉␉}␊
414␉␉if (getValueForKey(karch, &val, &len, &bootInfo->bootConfig)) {␊
415␉␉␉if (strncmp(val, "i386", 4) == 0) {␊
416␉␉␉␉archCpuType = CPU_TYPE_I386;␊
417␉␉␉}␊
418␉␉}␊
419␉␉if (getValueForKey(k32BitModeFlag, &val, &len, &bootInfo->bootConfig)) {␊
420␉␉␉archCpuType = CPU_TYPE_I386;␊
421␉␉}␊
422␉␉␊
423␉␉if (!getBoolForKey (kWake, &tryresume, &bootInfo->bootConfig)) {␊
424␉␉␉tryresume = true;␊
425␉␉␉tryresumedefault = true;␊
426␉␉} else {␊
427␉␉␉tryresumedefault = false;␊
428␉␉}␊
429␊
430␉␉if (!getBoolForKey (kForceWake, &forceresume, &bootInfo->bootConfig)) {␊
431␉␉␉forceresume = false;␊
432␉␉}␊
433␉␉␊
434␉␉if (forceresume) {␊
435␉␉␉tryresume = true;␊
436␉␉␉tryresumedefault = false;␊
437␉␉}␊
438␉␉␊
439␉␉while (tryresume) {␊
440␉␉␉const char *tmp;␊
441␉␉␉BVRef bvr;␊
442␉␉␉if (!getValueForKey(kWakeImage, &val, &len, &bootInfo->bootConfig))␊
443␉␉␉␉val="/private/var/vm/sleepimage";␊
444␉␉␉␊
445␉␉␉// Do this first to be sure that root volume is mounted␊
446␉␉␉ret = GetFileInfo(0, val, &flags, &sleeptime);␊
447␊
448␉␉␉if ((bvr = getBootVolumeRef(val, &tmp)) == NULL)␊
449␉␉␉␉break;␊
450␉␉␉␊
451␉␉␉// Can't check if it was hibernation Wake=y is required␊
452␉␉␉if (bvr->modTime == 0 && tryresumedefault)␊
453␉␉␉␉break;␊
454␉␉␉␊
455␉␉␉if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat))␊
456␉␉␉␉break;␊
457␉␉␉␊
458␉␉␉if (!forceresume && ((sleeptime+3)<bvr->modTime)) {␊
459␉␉␉␉printf ("Hibernate image is too old by %d seconds. Use ForceWake=y to override\n",bvr->modTime-sleeptime);␊
460␉␉␉␉break;␊
461␉␉␉}␊
462␉␉␉␉␊
463␉␉␉HibernateBoot((char *)val);␊
464␉␉␉break;␊
465␉␉}␊
466␊
467 // Reset cache name.␊
468 bzero(gCacheNameAdler + 64, sizeof(gCacheNameAdler) - 64);␊
469␊
470 sprintf(gCacheNameAdler + 64, "%s,%s", gRootDevice, bootInfo->bootFile);␊
471␊
472 adler32 = Adler32((unsigned char *)gCacheNameAdler, sizeof(gCacheNameAdler));␊
473␊
474 if (getValueForKey(kKernelCacheKey, &val, &len, &bootInfo->bootConfig)) {␊
475 strlcpy(gBootKernelCacheFile, val, len+1);␊
476 } else {␊
477 sprintf(gBootKernelCacheFile, "%s.%08lX", kDefaultCachePath, adler32);␊
478 }␊
479␊
480 // Check for cache file.␊
481 trycache = (((gBootMode & kBootModeSafe) == 0) &&␊
482 !gOverrideKernel &&␊
483 (gBootFileType == kBlockDeviceType) &&␊
484 (gMKextName[0] == '\0') &&␊
485 (gBootKernelCacheFile[0] != '\0'));␊
486␊
487␉␉verbose("Loading Darwin %s\n", gMacOSVersion);␊
488␉␉␊
489 if (trycache) do {␊
490 ␊
491 // if we haven't found the kernel yet, don't use the cache␊
492 ret = GetFileInfo(NULL, bootInfo->bootFile, &flags, &kerneltime);␊
493 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)) {␊
494 trycache = 0;␊
495 break;␊
496 }␊
497 ret = GetFileInfo(NULL, gBootKernelCacheFile, &flags, &cachetime);␊
498 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)␊
499 || (cachetime < kerneltime)) {␊
500 trycache = 0;␊
501 break;␊
502 }␊
503 ret = GetFileInfo("/System/Library/", "Extensions", &flags, &exttime);␊
504 if ((ret == 0) && ((flags & kFileTypeMask) == kFileTypeDirectory)␊
505 && (cachetime < exttime)) {␊
506 trycache = 0;␊
507 break;␊
508 }␊
509 if (kerneltime > exttime) {␊
510 exttime = kerneltime;␊
511 }␊
512 if (cachetime != (exttime + 1)) {␊
513 trycache = 0;␊
514 break;␊
515 }␊
516 } while (0);␊
517␊
518 do {␊
519 if (trycache) {␊
520 bootFile = gBootKernelCacheFile;␊
521 verbose("Loading kernel cache %s\n", bootFile);␊
522 ret = LoadFile(bootFile);␊
523 binary = (void *)kLoadAddr;␊
524 if (ret >= 0) {␊
525 break;␊
526 }␊
527 }␊
528 bootFile = bootInfo->bootFile;␊
529␊
530 // Try to load kernel image from alternate locations on boot helper partitions.␊
531 sprintf(bootFileSpec, "com.apple.boot.P/%s", bootFile);␊
532 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
533 ␉ ␉ if (ret == -1)␊
534 ␉ ␉ {␊
535 sprintf(bootFileSpec, "com.apple.boot.R/%s", bootFile);␊
536 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
537 if (ret == -1)␊
538 {␊
539 sprintf(bootFileSpec, "com.apple.boot.S/%s", bootFile);␊
540 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
541 if (ret == -1)␊
542 {␊
543 // Not found any alternate locations, using the original kernel image path.␊
544 strcpy(bootFileSpec, bootFile);␊
545 }␊
546 }␊
547 }␊
548 ␉␉␉␊
549 verbose("Loading kernel %s\n", bootFileSpec);␊
550 ret = LoadThinFatFile(bootFileSpec, &binary);␊
551 if (ret <= 0 && archCpuType == CPU_TYPE_X86_64)␊
552 {␊
553 archCpuType = CPU_TYPE_I386;␊
554 ret = LoadThinFatFile(bootFileSpec, &binary);␉␉␉␉␊
555 }␊
556␉␉␉␊
557 } while (0);␊
558␊
559 clearActivityIndicator();␊
560#if DEBUG␊
561 printf("Pausing...");␊
562 sleep(8);␊
563#endif␊
564␊
565 if (ret <= 0) {␊
566␉␉␉printf("Can't find %s\n", bootFile);␊
567␊
568␉␉␉if(gui.initialised) {␊
569␉␉␉␉sleep(1);␊
570␉␉␉␉drawBackground();␊
571␉␉␉␉gui.devicelist.draw = true;␊
572␉␉␉␉gui.redraw = true;␊
573␉␉␉}␊
574 if (gBootFileType == kNetworkDeviceType) {␊
575 // Return control back to PXE. Don't unload PXE base code.␊
576 gUnloadPXEOnExit = false;␊
577 break;␊
578 }␊
579 } else {␊
580 /* Won't return if successful. */␊
581 ret = ExecKernel(binary);␊
582 }␊
583 }␊
584 ␊
585 // chainboot␊
586 if (status==1) {␊
587␉if (getVideoMode() == GRAPHICS_MODE) {␉// if we are already in graphics-mode,␊
588␉␉setVideoMode(VGA_TEXT_MODE, 0);␉// switch back to text mode␊
589␉}␊
590 }␊
591␉␊
592 if ((gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit) {␊
593␉nbpUnloadBaseCode();␊
594 }␊
595}␊
596␊
597/*!␊
598 Selects a new BIOS device, taking care to update the global state appropriately.␊
599 */␊
600/*␊
601static void selectBiosDevice(void)␊
602{␊
603 struct DiskBVMap *oldMap = diskResetBootVolumes(gBIOSDev);␊
604 CacheReset();␊
605 diskFreeMap(oldMap);␊
606 oldMap = NULL;␊
607␊
608 int dev = selectAlternateBootDevice(gBIOSDev);␊
609␊
610 BVRef bvchain = scanBootVolumes(dev, 0);␊
611 BVRef bootVol = selectBootVolume(bvchain);␊
612 gBootVolume = bootVol;␊
613 setRootVolume(bootVol);␊
614 gBIOSDev = dev;␊
615}␊
616*/␊
617␊
618#define BASE 65521L /* largest prime smaller than 65536 */␊
619#define NMAX 5000␊
620// NMAX (was 5521) the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1␊
621␊
622#define DO1(buf,i) {s1 += buf[i]; s2 += s1;}␊
623#define DO2(buf,i) DO1(buf,i); DO1(buf,i+1);␊
624#define DO4(buf,i) DO2(buf,i); DO2(buf,i+2);␊
625#define DO8(buf,i) DO4(buf,i); DO4(buf,i+4);␊
626#define DO16(buf) DO8(buf,0); DO8(buf,8);␊
627␊
628unsigned long Adler32(unsigned char *buf, long len)␊
629{␊
630 unsigned long s1 = 1; // adler & 0xffff;␊
631 unsigned long s2 = 0; // (adler >> 16) & 0xffff;␊
632 unsigned long result;␊
633 int k;␊
634␊
635 while (len > 0) {␊
636 k = len < NMAX ? len : NMAX;␊
637 len -= k;␊
638 while (k >= 16) {␊
639 DO16(buf);␊
640 buf += 16;␊
641 k -= 16;␊
642 }␊
643 if (k != 0) do {␊
644 s1 += *buf++;␊
645 s2 += s1;␊
646 } while (--k);␊
647 s1 %= BASE;␊
648 s2 %= BASE;␊
649 }␊
650 result = (s2 << 16) | s1;␊
651 return OSSwapHostToBigInt32(result);␊
652}␊
653

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