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Source at commit 364 created 13 years 8 months ago.
By meklort, Updated rock paper scissors implimentation /com.apple.Boot.RPS/ to work 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␉if(init_module_system())␊
290␉{␊
291␉␉load_all_modules();␊
292␉}␊
293␉␉␊
294 // Disable rescan option by default␊
295 gEnableCDROMRescan = false;␊
296␊
297 // Enable it with Rescan=y in system config␊
298 if (getBoolForKey(kRescanKey, &gEnableCDROMRescan, &bootInfo->bootConfig) && gEnableCDROMRescan) {␊
299 gEnableCDROMRescan = true;␊
300 }␊
301␊
302 // Ask the user for Rescan option by setting "Rescan Prompt"=y in system config.␊
303 rescanPrompt = false;␊
304 if (getBoolForKey(kRescanPromptKey, &rescanPrompt , &bootInfo->bootConfig) && rescanPrompt && biosDevIsCDROM(gBIOSDev)) {␊
305 gEnableCDROMRescan = promptForRescanOption();␊
306 }␊
307␊
308 // Enable touching a single BIOS device only if "Scan Single Drive"=y is set in system config.␊
309 if (getBoolForKey(kScanSingleDriveKey, &gScanSingleDrive, &bootInfo->bootConfig) && gScanSingleDrive) {␊
310 gScanSingleDrive = true;␊
311 }␊
312␊
313 // Create a list of partitions on device(s).␊
314 if (gScanSingleDrive) {␊
315 scanBootVolumes(gBIOSDev, &bvCount);␊
316 } else {␊
317 scanDisks(gBIOSDev, &bvCount);␊
318 }␊
319␊
320 // Create a separated bvr chain using the specified filters.␊
321 bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
322␊
323 gBootVolume = selectBootVolume(bvChain);␊
324␊
325#if DEBUG␊
326 printf(" Default: %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBootVolume, gBootVolume->biosdev, gBootVolume->part_no, gBootVolume->flags);␊
327 printf(" bt(0,0): %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBIOSBootVolume, gBIOSBootVolume->biosdev, gBIOSBootVolume->part_no, gBIOSBootVolume->flags);␊
328 getc();␊
329#endif␊
330␊
331 useGUI = true;␊
332 // Override useGUI default␊
333 getBoolForKey(kGUIKey, &useGUI, &bootInfo->bootConfig);␊
334 if (useGUI) {␊
335␉␉patchVideoBios();␊
336 /* XXX AsereBLN handle error */␊
337␉␉initGUI();␊
338 }␊
339␊
340 setBootGlobals(bvChain);␊
341␊
342 // Parse args, load and start kernel.␊
343 while (1) {␊
344 const char *val;␊
345 int len;␊
346 int trycache;␊
347 long flags, cachetime, kerneltime, exttime, sleeptime, time;␊
348 int ret = -1;␊
349 void *binary = (void *)kLoadAddr;␊
350 bool tryresume;␊
351 bool tryresumedefault;␊
352 bool forceresume;␊
353␊
354 config_file_t systemVersion;␉␉// system.plist of booting partition␊
355␊
356 // additional variable for testing alternate kernel image locations on boot helper partitions.␊
357 char bootFileSpec[512];␊
358␉␉␊
359 // Initialize globals.␊
360␊
361 sysConfigValid = false;␊
362 gErrors = false;␊
363␊
364 status = getBootOptions(firstRun);␊
365 firstRun = false;␊
366 if (status == -1) continue;␊
367␉␉ ␊
368 status = processBootOptions();␊
369 // Status==1 means to chainboot␊
370 if ( status == 1 ) break;␊
371 // Status==-1 means that the config file couldn't be loaded or that gBootVolume is NULL␊
372 if ( status == -1 )␊
373 {␊
374 // gBootVolume == NULL usually means the user hit escape.␊
375 if(gBootVolume == NULL)␊
376 {␊
377 freeFilteredBVChain(bvChain);␊
378␊
379 if (gEnableCDROMRescan)␊
380 rescanBIOSDevice(gBIOSDev);␊
381 ␊
382 bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
383 setBootGlobals(bvChain);␊
384 }␊
385 continue;␊
386 }␊
387␉␉␊
388 // Other status (e.g. 0) means that we should proceed with boot.␊
389␉␉␊
390␉␉if( bootArgs->Video.v_display == GRAPHICS_MODE )␊
391␉␉␉drawBackground();␊
392␉␉␉␊
393 // Found and loaded a config file. Proceed with boot.␊
394␊
395␉␉// Turn off any GUI elements␊
396␉␉if( bootArgs->Video.v_display == GRAPHICS_MODE )␊
397␉␉{␊
398␉␉␉gui.devicelist.draw = false;␊
399␉␉␉gui.bootprompt.draw = false;␊
400␉␉␉gui.menu.draw = false;␊
401␉␉␉gui.infobox.draw = false;␊
402␉␉␉drawBackground();␊
403␉␉␉updateVRAM();␊
404␉␉}␊
405␉␉␊
406␉␉// Find out which version mac os we're booting.␊
407␉␉if (!loadConfigFile("System/Library/CoreServices/SystemVersion.plist", &systemVersion)) {␊
408␉␉␉if (getValueForKey(kProductVersion, &val, &len, &systemVersion)) {␉␊
409␉␉␉␉// getValueForKey uses const char for val␊
410␉␉␉␉// so copy it and trim␊
411␉␉␉␉strncpy(gMacOSVersion, val, MIN(len, 4));␊
412␉␉␉␉gMacOSVersion[MIN(len, 4)] = '\0';␊
413␉␉␉}␊
414␉␉}␊
415␊
416␉␉if (platformCPUFeature(CPU_FEATURE_EM64T)) {␊
417␉␉␉archCpuType = CPU_TYPE_X86_64;␊
418␉␉} else {␊
419␉␉␉archCpuType = CPU_TYPE_I386;␊
420␉␉}␊
421␉␉if (getValueForKey(karch, &val, &len, &bootInfo->bootConfig)) {␊
422␉␉␉if (strncmp(val, "i386", 4) == 0) {␊
423␉␉␉␉archCpuType = CPU_TYPE_I386;␊
424␉␉␉}␊
425␉␉}␊
426␉␉if (getValueForKey(k32BitModeFlag, &val, &len, &bootInfo->bootConfig)) {␊
427␉␉␉archCpuType = CPU_TYPE_I386;␊
428␉␉}␊
429␉␉␊
430␉␉if (!getBoolForKey (kWake, &tryresume, &bootInfo->bootConfig)) {␊
431␉␉␉tryresume = true;␊
432␉␉␉tryresumedefault = true;␊
433␉␉} else {␊
434␉␉␉tryresumedefault = false;␊
435␉␉}␊
436␊
437␉␉if (!getBoolForKey (kForceWake, &forceresume, &bootInfo->bootConfig)) {␊
438␉␉␉forceresume = false;␊
439␉␉}␊
440␉␉␊
441␉␉if (forceresume) {␊
442␉␉␉tryresume = true;␊
443␉␉␉tryresumedefault = false;␊
444␉␉}␊
445␉␉␊
446␉␉while (tryresume) {␊
447␉␉␉const char *tmp;␊
448␉␉␉BVRef bvr;␊
449␉␉␉if (!getValueForKey(kWakeImage, &val, &len, &bootInfo->bootConfig))␊
450␉␉␉␉val="/private/var/vm/sleepimage";␊
451␉␉␉␊
452␉␉␉// Do this first to be sure that root volume is mounted␊
453␉␉␉ret = GetFileInfo(0, val, &flags, &sleeptime);␊
454␊
455␉␉␉if ((bvr = getBootVolumeRef(val, &tmp)) == NULL)␊
456␉␉␉␉break;␊
457␉␉␉␊
458␉␉␉// Can't check if it was hibernation Wake=y is required␊
459␉␉␉if (bvr->modTime == 0 && tryresumedefault)␊
460␉␉␉␉break;␊
461␉␉␉␊
462␉␉␉if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat))␊
463␉␉␉␉break;␊
464␉␉␉␊
465␉␉␉if (!forceresume && ((sleeptime+3)<bvr->modTime)) {␊
466␉␉␉␉printf ("Hibernate image is too old by %d seconds. Use ForceWake=y to override\n",bvr->modTime-sleeptime);␊
467␉␉␉␉break;␊
468␉␉␉}␊
469␉␉␉␉␊
470␉␉␉HibernateBoot((char *)val);␊
471␉␉␉break;␊
472␉␉}␊
473␊
474 // Reset cache name.␊
475 bzero(gCacheNameAdler + 64, sizeof(gCacheNameAdler) - 64);␊
476␊
477 sprintf(gCacheNameAdler + 64, "%s,%s", gRootDevice, bootInfo->bootFile);␊
478␊
479 adler32 = Adler32((unsigned char *)gCacheNameAdler, sizeof(gCacheNameAdler));␊
480␊
481 if (getValueForKey(kKernelCacheKey, &val, &len, &bootInfo->bootConfig)) {␊
482 strlcpy(gBootKernelCacheFile, val, len+1);␊
483 } else {␊
484 sprintf(gBootKernelCacheFile, "%s.%08lX", kDefaultCachePath, adler32);␊
485 }␊
486␊
487 // Check for cache file.␊
488 trycache = (((gBootMode & kBootModeSafe) == 0) &&␊
489 !gOverrideKernel &&␊
490 (gBootFileType == kBlockDeviceType) &&␊
491 (gMKextName[0] == '\0') &&␊
492 (gBootKernelCacheFile[0] != '\0'));␊
493␊
494␉␉verbose("Loading Darwin %s\n", gMacOSVersion);␊
495␉␉␊
496 if (trycache) do {␊
497 ␊
498 // if we haven't found the kernel yet, don't use the cache␊
499 ret = GetFileInfo(NULL, bootInfo->bootFile, &flags, &kerneltime);␊
500 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)) {␊
501 trycache = 0;␊
502 break;␊
503 }␊
504 ret = GetFileInfo(NULL, gBootKernelCacheFile, &flags, &cachetime);␊
505 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)␊
506 || (cachetime < kerneltime)) {␊
507 trycache = 0;␊
508 break;␊
509 }␊
510 ret = GetFileInfo("/System/Library/", "Extensions", &flags, &exttime);␊
511 if ((ret == 0) && ((flags & kFileTypeMask) == kFileTypeDirectory)␊
512 && (cachetime < exttime)) {␊
513 trycache = 0;␊
514 break;␊
515 }␊
516 if (kerneltime > exttime) {␊
517 exttime = kerneltime;␊
518 }␊
519 if (cachetime != (exttime + 1)) {␊
520 trycache = 0;␊
521 break;␊
522 }␊
523 } while (0);␊
524␊
525 do {␊
526 if (trycache) {␊
527 bootFile = gBootKernelCacheFile;␊
528 verbose("Loading kernel cache %s\n", bootFile);␊
529 ret = LoadFile(bootFile);␊
530 binary = (void *)kLoadAddr;␊
531 if (ret >= 0) {␊
532 break;␊
533 }␊
534 }␊
535 bootFile = bootInfo->bootFile;␊
536␊
537 // Try to load kernel image from alternate locations on boot helper partitions.␊
538 sprintf(bootFileSpec, "com.apple.boot.P/%s", bootFile);␊
539 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
540 ␉ ␉ if (ret == -1)␊
541 ␉ ␉ {␊
542 sprintf(bootFileSpec, "com.apple.boot.R/%s", bootFile);␊
543 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
544 if (ret == -1)␊
545 {␊
546 sprintf(bootFileSpec, "com.apple.boot.S/%s", bootFile);␊
547 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
548 if (ret == -1)␊
549 {␊
550 // Not found any alternate locations, using the original kernel image path.␊
551 strcpy(bootFileSpec, bootFile);␊
552 }␊
553 }␊
554 }␊
555 ␉␉␉␊
556 verbose("Loading kernel %s\n", bootFileSpec);␊
557 ret = LoadThinFatFile(bootFileSpec, &binary);␊
558 if (ret <= 0 && archCpuType == CPU_TYPE_X86_64)␊
559 {␊
560 archCpuType = CPU_TYPE_I386;␊
561 ret = LoadThinFatFile(bootFileSpec, &binary);␉␉␉␉␊
562 }␊
563␉␉␉␊
564 } while (0);␊
565␊
566 clearActivityIndicator();␊
567#if DEBUG␊
568 printf("Pausing...");␊
569 sleep(8);␊
570#endif␊
571␊
572 if (ret <= 0) {␊
573␉␉␉printf("Can't find %s\n", bootFile);␊
574␊
575␉␉␉if(gui.initialised) {␊
576␉␉␉␉sleep(1);␊
577␉␉␉␉drawBackground();␊
578␉␉␉␉gui.devicelist.draw = true;␊
579␉␉␉␉gui.redraw = true;␊
580␉␉␉}␊
581 if (gBootFileType == kNetworkDeviceType) {␊
582 // Return control back to PXE. Don't unload PXE base code.␊
583 gUnloadPXEOnExit = false;␊
584 break;␊
585 }␊
586 } else {␊
587 /* Won't return if successful. */␊
588 ret = ExecKernel(binary);␊
589 }␊
590 }␊
591 ␊
592 // chainboot␊
593 if (status==1) {␊
594␉if (getVideoMode() == GRAPHICS_MODE) {␉// if we are already in graphics-mode,␊
595␉␉setVideoMode(VGA_TEXT_MODE, 0);␉// switch back to text mode␊
596␉}␊
597 }␊
598␉␊
599 if ((gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit) {␊
600␉nbpUnloadBaseCode();␊
601 }␊
602}␊
603␊
604/*!␊
605 Selects a new BIOS device, taking care to update the global state appropriately.␊
606 */␊
607/*␊
608static void selectBiosDevice(void)␊
609{␊
610 struct DiskBVMap *oldMap = diskResetBootVolumes(gBIOSDev);␊
611 CacheReset();␊
612 diskFreeMap(oldMap);␊
613 oldMap = NULL;␊
614␊
615 int dev = selectAlternateBootDevice(gBIOSDev);␊
616␊
617 BVRef bvchain = scanBootVolumes(dev, 0);␊
618 BVRef bootVol = selectBootVolume(bvchain);␊
619 gBootVolume = bootVol;␊
620 setRootVolume(bootVol);␊
621 gBIOSDev = dev;␊
622}␊
623*/␊
624␊
625#define BASE 65521L /* largest prime smaller than 65536 */␊
626#define NMAX 5000␊
627// NMAX (was 5521) the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1␊
628␊
629#define DO1(buf,i) {s1 += buf[i]; s2 += s1;}␊
630#define DO2(buf,i) DO1(buf,i); DO1(buf,i+1);␊
631#define DO4(buf,i) DO2(buf,i); DO2(buf,i+2);␊
632#define DO8(buf,i) DO4(buf,i); DO4(buf,i+4);␊
633#define DO16(buf) DO8(buf,0); DO8(buf,8);␊
634␊
635unsigned long Adler32(unsigned char *buf, long len)␊
636{␊
637 unsigned long s1 = 1; // adler & 0xffff;␊
638 unsigned long s2 = 0; // (adler >> 16) & 0xffff;␊
639 unsigned long result;␊
640 int k;␊
641␊
642 while (len > 0) {␊
643 k = len < NMAX ? len : NMAX;␊
644 len -= k;␊
645 while (k >= 16) {␊
646 DO16(buf);␊
647 buf += 16;␊
648 k -= 16;␊
649 }␊
650 if (k != 0) do {␊
651 s1 += *buf++;␊
652 s2 += s1;␊
653 } while (--k);␊
654 s1 %= BASE;␊
655 s2 %= BASE;␊
656 }␊
657 result = (s2 << 16) | s1;␊
658 return OSSwapHostToBigInt32(result);␊
659}␊
660

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