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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␊
61long gBootMode; /* defaults to 0 == kBootModeNormal */␊
62BOOL gOverrideKernel;␊
63static char gBootKernelCacheFile[512];␊
64static char gCacheNameAdler[64 + 256];␊
65char *gPlatformName = gCacheNameAdler;␊
66char gRootDevice[512];␊
67char gMKextName[512];␊
68char gMacOSVersion[8];␊
69BOOL gEnableCDROMRescan;␊
70BOOL gScanSingleDrive;␊
71␊
72int bvCount = 0;␊
73//int␉␉menucount = 0;␊
74int gDeviceCount = 0; ␊
75␊
76BVRef bvr;␊
77BVRef menuBVR;␊
78BVRef bvChain;␊
79BOOL useGUI = TRUE;␊
80␊
81//static void selectBiosDevice(void);␊
82␊
83static␊
84unsigned long Adler32(unsigned char *buffer, long length);␊
85␊
86␊
87static BOOL gUnloadPXEOnExit = 0;␊
88␊
89/*␊
90 * How long to wait (in seconds) to load the␊
91 * kernel after displaying the "boot:" prompt.␊
92 */␊
93#define kBootErrorTimeout 5␊
94␊
95/*␊
96 * Default path to kernel cache file␊
97 */␊
98#define kDefaultCachePath "/System/Library/Caches/com.apple.kernelcaches/kernelcache"␊
99␊
100//==========================================================================␊
101// Zero the BSS.␊
102␊
103static void zeroBSS()␊
104{␊
105 extern char _DATA__bss__begin, _DATA__bss__end;␊
106 extern char _DATA__common__begin, _DATA__common__end;␊
107␊
108 bzero( &_DATA__bss__begin,␊
109 (&_DATA__bss__end - &_DATA__bss__begin) );␊
110␊
111 bzero( &_DATA__common__begin, ␊
112 (&_DATA__common__end - &_DATA__common__begin) );␊
113}␊
114␊
115//==========================================================================␊
116// Malloc error function␊
117␊
118static void malloc_error(char *addr, size_t size)␊
119{␊
120 printf("\nMemory allocation error (0x%x, 0x%x)\n",␊
121 (unsigned)addr, (unsigned)size);␊
122 asm volatile ("hlt");␊
123}␊
124␊
125/*!␊
126 Initializes the runtime. Right now this means zeroing the BSS and initializing malloc.␊
127 */␊
128void initialize_runtime()␊
129{␊
130 zeroBSS();␊
131␊
132 // Initialize malloc␊
133 malloc_init(0, 0, 0, malloc_error);␊
134}␊
135␊
136//==========================================================================␊
137// execKernel - Load the kernel image (mach-o) and jump to its entry point.␊
138␊
139static int ExecKernel(void *binary)␊
140{␊
141 entry_t kernelEntry;␊
142 int ret;␊
143␊
144 bootArgs->kaddr = bootArgs->ksize = 0;␊
145␊
146 ret = DecodeKernel(binary,␊
147 &kernelEntry,␊
148 (char **) &bootArgs->kaddr,␊
149 (int *)&bootArgs->ksize );␊
150␊
151 if ( ret != 0 )␊
152 return ret;␊
153␊
154 // Reserve space for boot args␊
155 reserveKernBootStruct();␊
156␊
157 // Load boot drivers from the specifed root path.␊
158␊
159 if (!gHaveKernelCache) {␊
160 LoadDrivers("/");␊
161 }␊
162␊
163 clearActivityIndicator();␊
164␊
165 if (gErrors) {␊
166 printf("Errors encountered while starting up the computer.\n");␊
167 printf("Pausing %d seconds...\n", kBootErrorTimeout);␊
168 sleep(kBootErrorTimeout);␊
169 }␊
170␊
171 setupFakeEfi();␊
172␊
173 verbose("Starting Darwin %s\n",( archCpuType == CPU_TYPE_I386 ) ? "x86" : "x86_64");␊
174␊
175 // Cleanup the PXE base code.␊
176␊
177 if ( (gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit ) {␊
178␉␉if ( (ret = nbpUnloadBaseCode()) != nbpStatusSuccess )␊
179 {␊
180 ␉printf("nbpUnloadBaseCode error %d\n", (int) ret);␊
181 sleep(2);␊
182 }␊
183 }␊
184␊
185␉BOOL dummyVal;␊
186␊
187 if (getBoolForKey(kWaitForKeypressKey, &dummyVal, &bootInfo->bootConfig) && dummyVal)␊
188 {␊
189 printf("Press any key to continue...");␊
190 getc();␊
191 }␊
192␊
193 // If we were in text mode, switch to graphics mode.␊
194 // This will draw the boot graphics unless we are in␊
195 // verbose mode.␊
196␊
197 if(gVerboseMode)␊
198 setVideoMode( GRAPHICS_MODE, 0 );␊
199 else␊
200 drawBootGraphics();␊
201␉␊
202 finalizeBootStruct();␊
203 ␊
204 // Jump to kernel's entry point. There's no going back now.␊
205␊
206 startprog( kernelEntry, bootArgs );␊
207␊
208 // Not reached␊
209␊
210 return 0;␊
211}␊
212␊
213//==========================================================================␊
214// Scan and record the system's hardware information.␊
215␊
216static void scanHardware()␊
217{␊
218␉extern void scan_platform();␊
219␊
220␉scan_platform();␊
221}␊
222␊
223/*!␊
224 This is the entrypoint from real-mode which functions exactly as it did before.␊
225 Multiboot does its own runtime initialization, does some of its own things, and then␊
226 calls common_boot.␊
227 */␊
228void boot(int biosdev)␊
229{␊
230 initialize_runtime();␊
231␊
232 // Enable A20 gate before accessing memory above 1Mb.␊
233 enableA20();␊
234␊
235 return common_boot(biosdev);␊
236}␊
237␊
238//==========================================================================␊
239// The 'main' function for the booter. Called by boot0 when booting␊
240// from a block device, or by the network booter.␊
241//␊
242// arguments:␊
243// biosdev - Value passed from boot1/NBP to specify the device␊
244// that the booter was loaded from.␊
245//␊
246// If biosdev is kBIOSDevNetwork, then this function will return if␊
247// booting was unsuccessful. This allows the PXE firmware to try the␊
248// next boot device on its list.␊
249␊
250#define DLOG(x) outb(0x80, (x))␊
251␊
252void common_boot(int biosdev)␊
253{␊
254 int status;␊
255 char *bootFile;␊
256 unsigned long adler32;␊
257 BOOL quiet;␊
258 BOOL firstRun = YES;␊
259 BOOL instantMenu;␊
260 BOOL rescanPrompt;␊
261 unsigned int allowBVFlags = kBVFlagSystemVolume|kBVFlagForeignBoot;␊
262 unsigned int denyBVFlags = kBVFlagEFISystem;␊
263␊
264 // Set reminder to unload the PXE base code. Neglect to unload␊
265 // the base code will result in a hang or kernel panic.␊
266␊
267 gUnloadPXEOnExit = 1;␊
268␊
269 // Record the device that the booter was loaded from.␊
270␊
271 gBIOSDev = biosdev & kBIOSDevMask;␊
272␊
273 // Initialize boot info structure.␊
274␊
275 initKernBootStruct();␊
276␊
277 // Setup VGA text mode.␊
278 // Not sure if it is safe to call setVideoMode() before the␊
279 // config table has been loaded. Call video_mode() instead.␊
280␊
281#if DEBUG␊
282 printf("before video_mode\n");␊
283#endif␊
284 video_mode( 2 ); // 80x25 mono text mode.␊
285#if DEBUG␊
286 printf("after video_mode\n");␊
287#endif␊
288␊
289 // Check to see that this hardware is supported.␊
290 status = checkForSupportedHardware();␊
291 if (status != 0) {␊
292 printf("This hardware configuration is not supported by Darwin/x86. (%d)", status);␊
293 }␊
294␊
295 // First get info for boot volume.␊
296 scanBootVolumes(gBIOSDev, 0);␊
297 bvChain = getBVChainForBIOSDev(gBIOSDev);␊
298 setBootGlobals(bvChain);␊
299 ␊
300 // Load boot.plist config file␊
301 status = loadSystemConfig(&bootInfo->bootConfig);␊
302␊
303 if ( getBoolForKey( kQuietBootKey, &quiet, &bootInfo->bootConfig ) && quiet ) {␊
304 gBootMode |= kBootModeQuiet;␊
305 }␊
306␊
307 // Override firstRun to get to the boot menu instantly by setting "Instant Menu"=y in system config␊
308 if ( getBoolForKey( kInsantMenuKey, &instantMenu, &bootInfo->bootConfig ) && instantMenu ) {␊
309 firstRun = FALSE;␊
310 }␊
311␊
312 // Loading preboot ramdisk if exists.␊
313 loadPrebootRAMDisk();␊
314␊
315 // Disable rescan option by default␊
316 gEnableCDROMRescan = FALSE;␊
317␊
318 // Enable it with Rescan=y in system config␊
319 if ( getBoolForKey( kRescanKey, &gEnableCDROMRescan, &bootInfo->bootConfig ) && gEnableCDROMRescan ) {␊
320 gEnableCDROMRescan = TRUE;␊
321 }␊
322␊
323 // Ask the user for Rescan option by setting "Rescan Prompt"=y in system config.␊
324 rescanPrompt = FALSE;␊
325 if ( getBoolForKey( kRescanPromptKey, &rescanPrompt , &bootInfo->bootConfig ) && rescanPrompt␊
326 && biosDevIsCDROM(gBIOSDev) ) {␊
327 gEnableCDROMRescan = promptForRescanOption();␊
328 }␊
329␊
330 // Enable touching a single BIOS device only if "Scan Single Drive"=y is set in system config.␊
331 if ( getBoolForKey( kScanSingleDriveKey, &gScanSingleDrive, &bootInfo->bootConfig ) && gScanSingleDrive ) {␊
332 gScanSingleDrive = TRUE;␊
333 }␊
334␊
335 // Create a list of partitions on device(s).␊
336 if (gScanSingleDrive)␊
337 scanBootVolumes( gBIOSDev, &bvCount );␊
338 else␊
339 scanDisks( gBIOSDev, &bvCount );␊
340␊
341 // Create a separated bvr chain using the specified filters.␊
342 bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
343␊
344 gBootVolume = selectBootVolume(bvChain);␊
345␊
346#if DEBUG␊
347 printf(" Default: %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBootVolume, gBootVolume->biosdev, gBootVolume->part_no, gBootVolume->flags);␊
348 printf(" bt(0,0): %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBIOSBootVolume, gBIOSBootVolume->biosdev, gBIOSBootVolume->part_no, gBIOSBootVolume->flags);␊
349 getc();␊
350#endif␊
351␊
352␉// Scan hardware configuration.␊
353 scanHardware();␊
354␉␊
355␉// Check if GUI=n switch is present in config file␊
356 if ( getBoolForKey(kGUIKey, &useGUI, &bootInfo->bootConfig) && !useGUI )␊
357 useGUI = FALSE;␊
358␉␉␊
359 // Try initialising the GUI unless disabled␊
360 if( useGUI )␊
361 initGUI();␊
362 ␊
363 // Load boot logo image␊
364 loadBootGraphics();␊
365␊
366 setBootGlobals(bvChain);␊
367 ␊
368 // Parse args, load and start kernel.␊
369 while (1)␊
370 {␊
371 const char *val;␊
372 int len;␊
373 int trycache;␊
374 long flags, cachetime, kerneltime, exttime, sleeptime, time;␊
375 int ret = -1;␊
376 void *binary = (void *)kLoadAddr;␊
377 BOOL tryresume;␊
378 BOOL tryresumedefault;␊
379 BOOL forceresume;␊
380␊
381 config_file_t systemVersion;␉␉// system.plist of booting partition␊
382␊
383 // additional variable for testing alternate kernel image locations on boot helper partitions.␊
384 char bootFileSpec[512];␊
385␉␉␊
386 // Initialize globals.␊
387␊
388 sysConfigValid = 0;␊
389 gErrors = 0;␊
390␊
391 status = getBootOptions(firstRun);␊
392 firstRun = NO;␊
393 if (status == -1) continue;␊
394␉␉ ␊
395 status = processBootOptions();␊
396 // Status==1 means to chainboot␊
397 if ( status == 1 ) break;␊
398 // Status==-1 means that the config file couldn't be loaded or that gBootVolume is NULL␊
399 if ( status == -1 )␊
400 {␊
401 // gBootVolume == NULL usually means the user hit escape.␊
402 if(gBootVolume == NULL)␊
403 {␊
404 freeFilteredBVChain(bvChain);␊
405␊
406 if (gEnableCDROMRescan)␊
407 rescanBIOSDevice(gBIOSDev);␊
408 ␊
409 bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
410 setBootGlobals(bvChain);␊
411 }␊
412 continue;␊
413 }␊
414␉␉␊
415 // Other status (e.g. 0) means that we should proceed with boot.␊
416␉␉␊
417␉␉if( bootArgs->Video.v_display == GRAPHICS_MODE )␊
418␉␉␉drawBackground();␊
419␉␉␉␊
420 // Found and loaded a config file. Proceed with boot.␊
421␊
422␉␉// Turn off any GUI elements␊
423␉␉if( bootArgs->Video.v_display == GRAPHICS_MODE )␊
424␉␉{␊
425␉␉␉gui.devicelist.draw = NO;␊
426␉␉␉gui.bootprompt.draw = NO;␊
427␉␉␉gui.menu.draw = NO;␊
428␉␉␉gui.infobox.draw = NO;␊
429␉␉␉drawBackground();␊
430␉␉␉updateVRAM();␊
431␉␉}␊
432␉␉␊
433␉␉// Find out which version mac os we're booting.␊
434␉␉if (!loadConfigFile("System/Library/CoreServices/SystemVersion.plist", &systemVersion) )␊
435␉␉␉if (getValueForKey("ProductVersion", &val, &len, &systemVersion))␊
436␉␉␉{␉␊
437␉␉␉␉// getValueForKey uses const char for val␊
438␉␉␉␉// so copy it and trim␊
439␉␉␉␉strncpy(gMacOSVersion, val, MIN(len, 4));␊
440␉␉␉␉gMacOSVersion[MIN(len, 4)] = '\0';␊
441␉␉␉}␊
442␉␉␊
443␉␉archCpuType=detectCpuType ();␊
444␉␉if (getValueForKey("arch", &val, &len, &bootInfo->bootConfig))␊
445␉␉{␊
446␉␉␉if(strncmp(val,"x86_64",6) == 0)␊
447␉␉␉␉archCpuType=CPU_TYPE_X86_64;␊
448 ␉␉␉else␊
449␉␉␉␉archCpuType=CPU_TYPE_I386;␊
450␉␉}␊
451␉␉␊
452␉␉if (!getBoolForKey ("Wake", &tryresume, &bootInfo->bootConfig))␊
453␉␉{␊
454␉␉␉tryresume = TRUE;␊
455␉␉␉tryresumedefault = TRUE;␊
456␉␉}␊
457␉␉else␊
458␉␉␉tryresumedefault = FALSE;␊
459␊
460␉␉if (!getBoolForKey ("ForceWake", &forceresume, &bootInfo->bootConfig))␊
461␉␉␉forceresume = FALSE;␊
462␉␉␊
463␉␉if (forceresume)␊
464␉␉{␊
465␉␉␉tryresume = TRUE;␊
466␉␉␉tryresumedefault = FALSE;␊
467␉␉}␊
468␉␉␊
469␉␉while (tryresume) {␊
470␉␉␉const char *tmp;␊
471␉␉␉BVRef bvr;␊
472␉␉␉if (!getValueForKey("WakeImage", &val, &len, &bootInfo->bootConfig))␊
473␉␉␉␉val="/private/var/vm/sleepimage";␊
474␉␉␉␊
475␉␉␉// Do this first to be sure that root volume is mounted␊
476␉␉␉ret = GetFileInfo(0, val, &flags, &sleeptime);␊
477␊
478␉␉␉if ((bvr = getBootVolumeRef(val, &tmp)) == NULL)␊
479␉␉␉␉break;␊
480␉␉␉␊
481␉␉␉// Can't check if it was hibernation Wake=y is required␊
482␉␉␉if (bvr->modTime == 0 && tryresumedefault)␊
483␉␉␉␉break;␊
484␉␉␉␊
485␉␉␉if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat))␊
486␉␉␉␉break;␊
487␉␉␉␊
488␉␉␉if (!forceresume && sleeptime+3<bvr->modTime)␊
489␉␉␉{␊
490␉␉␉␉printf ("Hibernate image is too old by %d seconds. Use ForceWake=y to override\n",bvr->modTime-sleeptime);␊
491␉␉␉␉break;␊
492␉␉␉}␊
493␉␉␉␉␊
494␉␉␉HibernateBoot((char *)val);␊
495␉␉␉break;␊
496␉␉}␊
497␊
498 // Reset cache name.␊
499 bzero(gCacheNameAdler + 64, sizeof(gCacheNameAdler) - 64);␊
500␊
501 sprintf(gCacheNameAdler + 64, "%s,%s", gRootDevice, bootInfo->bootFile);␊
502␊
503 adler32 = Adler32((unsigned char *)gCacheNameAdler, sizeof(gCacheNameAdler));␊
504␊
505 if (getValueForKey(kKernelCacheKey, &val, &len, &bootInfo->bootConfig) == YES) {␊
506 strlcpy(gBootKernelCacheFile, val, len+1);␊
507 } else {␊
508 sprintf(gBootKernelCacheFile, "%s.%08lX", kDefaultCachePath, adler32);␊
509 }␊
510␊
511 // Check for cache file.␊
512 trycache = (((gBootMode & kBootModeSafe) == 0) &&␊
513 (gOverrideKernel == NO) &&␊
514 (gBootFileType == kBlockDeviceType) &&␊
515 (gMKextName[0] == '\0') &&␊
516 (gBootKernelCacheFile[0] != '\0'));␊
517␊
518␉␉verbose("Loading Darwin %s\n", gMacOSVersion);␊
519␉␉␊
520 if (trycache) do {␊
521 ␊
522 // if we haven't found the kernel yet, don't use the cache␊
523 ret = GetFileInfo(NULL, bootInfo->bootFile, &flags, &kerneltime);␊
524 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)) {␊
525 trycache = 0;␊
526 break;␊
527 }␊
528 ret = GetFileInfo(NULL, gBootKernelCacheFile, &flags, &cachetime);␊
529 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)␊
530 || (cachetime < kerneltime)) {␊
531 trycache = 0;␊
532 break;␊
533 }␊
534 ret = GetFileInfo("/System/Library/", "Extensions", &flags, &exttime);␊
535 if ((ret == 0) && ((flags & kFileTypeMask) == kFileTypeDirectory)␊
536 && (cachetime < exttime)) {␊
537 trycache = 0;␊
538 break;␊
539 }␊
540 if (kerneltime > exttime) {␊
541 exttime = kerneltime;␊
542 }␊
543 if (cachetime != (exttime + 1)) {␊
544 trycache = 0;␊
545 break;␊
546 }␊
547 } while (0);␊
548␊
549 do {␊
550 if (trycache) {␊
551 bootFile = gBootKernelCacheFile;␊
552 verbose("Loading kernel cache %s\n", bootFile);␊
553 ret = LoadFile(bootFile);␊
554 binary = (void *)kLoadAddr;␊
555 if (ret >= 0) {␊
556 break;␊
557 }␊
558 }␊
559 bootFile = bootInfo->bootFile;␊
560␊
561 // Try to load kernel image from alternate locations on boot helper partitions.␊
562 sprintf(bootFileSpec, "com.apple.boot.P/%s", bootFile);␊
563 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
564 ␉ ␉ if (ret == -1)␊
565 ␉ ␉ {␊
566 sprintf(bootFileSpec, "com.apple.boot.R/%s", bootFile);␊
567 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
568 if (ret == -1)␊
569 {␊
570 sprintf(bootFileSpec, "com.apple.boot.S/%s", bootFile);␊
571 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
572 if (ret == -1)␊
573 {␊
574 // Not found any alternate locations, using the original kernel image path.␊
575 strcpy(bootFileSpec, bootFile);␊
576 }␊
577 }␊
578 }␊
579 ␉␉␉␊
580 verbose("Loading kernel %s\n", bootFileSpec);␊
581 ret = LoadThinFatFile(bootFileSpec, &binary);␊
582 if (ret <= 0 && archCpuType == CPU_TYPE_X86_64)␊
583 {␊
584 archCpuType = CPU_TYPE_I386;␊
585 ret = LoadThinFatFile(bootFileSpec, &binary);␉␉␉␉␊
586 }␊
587␉␉␉␊
588 } while (0);␊
589␊
590 clearActivityIndicator();␊
591#if DEBUG␊
592 printf("Pausing...");␊
593 sleep(8);␊
594#endif␊
595␊
596 if (ret <= 0)␊
597␉␉{␊
598␉␉␉printf("Can't find %s\n", bootFile);␊
599␊
600␉␉␉if(gui.initialised == YES)␊
601␉␉␉{␊
602␉␉␉␉sleep(1);␊
603␉␉␉␉drawBackground();␊
604␉␉␉␉gui.devicelist.draw = YES;␊
605␉␉␉␉gui.redraw = YES;␊
606␉␉␉}␊
607␉␉␉␉␊
608 if ( gBootFileType == kNetworkDeviceType )␊
609 {␊
610 // Return control back to PXE. Don't unload PXE base code.␊
611 gUnloadPXEOnExit = 0;␊
612 break;␊
613 }␊
614␉␉␉␊
615 } else {␊
616 /* Won't return if successful. */␊
617 ret = ExecKernel(binary);␊
618 }␊
619␊
620 } /* while(1) */␊
621 ␊
622 // chainboot␊
623 if(status==1)␊
624␉if(getVideoMode() == GRAPHICS_MODE) // if we are already in graphics-mode,␊
625␉␉setVideoMode(VGA_TEXT_MODE, 0);␉// switch back to text mode␊
626␉␊
627 if ((gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit) {␊
628␉nbpUnloadBaseCode();␊
629 }␊
630}␊
631␊
632/*!␊
633 Selects a new BIOS device, taking care to update the global state appropriately.␊
634 */␊
635/*␊
636static void selectBiosDevice(void)␊
637{␊
638 struct DiskBVMap *oldMap = diskResetBootVolumes(gBIOSDev);␊
639 CacheReset();␊
640 diskFreeMap(oldMap);␊
641 oldMap = NULL;␊
642␊
643 int dev = selectAlternateBootDevice(gBIOSDev);␊
644␊
645 BVRef bvchain = scanBootVolumes(dev, 0);␊
646 BVRef bootVol = selectBootVolume(bvchain);␊
647 gBootVolume = bootVol;␊
648 setRootVolume(bootVol);␊
649 gBIOSDev = dev;␊
650}␊
651*/␊
652␊
653#define BASE 65521L /* largest prime smaller than 65536 */␊
654#define NMAX 5000␊
655// NMAX (was 5521) the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1␊
656␊
657#define DO1(buf,i) {s1 += buf[i]; s2 += s1;}␊
658#define DO2(buf,i) DO1(buf,i); DO1(buf,i+1);␊
659#define DO4(buf,i) DO2(buf,i); DO2(buf,i+2);␊
660#define DO8(buf,i) DO4(buf,i); DO4(buf,i+4);␊
661#define DO16(buf) DO8(buf,0); DO8(buf,8);␊
662␊
663unsigned long Adler32(unsigned char *buf, long len)␊
664{␊
665 unsigned long s1 = 1; // adler & 0xffff;␊
666 unsigned long s2 = 0; // (adler >> 16) & 0xffff;␊
667 unsigned long result;␊
668 int k;␊
669␊
670 while (len > 0) {␊
671 k = len < NMAX ? len : NMAX;␊
672 len -= k;␊
673 while (k >= 16) {␊
674 DO16(buf);␊
675 buf += 16;␊
676 k -= 16;␊
677 }␊
678 if (k != 0) do {␊
679 s1 += *buf++;␊
680 s2 += s1;␊
681 } while (--k);␊
682 s1 %= BASE;␊
683 s2 %= BASE;␊
684 }␊
685 result = (s2 << 16) | s1;␊
686 return OSSwapHostToBigInt32(result);␊
687}␊
688

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