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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␊
118//==========================================================================␊
119// Malloc error function␊
120␊
121static void malloc_error(char *addr, size_t size, const char *file, int line)␊
122{␊
123␉stop("\nMemory allocation error! Addr=0x%x, Size=0x%x, File=%s, Line=%d\n", (unsigned)addr, (unsigned)size, file, line);␊
124}␊
125␊
126/*!␊
127 Initializes the runtime. Right now this means zeroing the BSS and initializing malloc.␊
128 */␊
129void initialize_runtime()␊
130{␊
131 zeroBSS();␊
132␊
133 // Initialize malloc␊
134 malloc_init(0, 0, 0, malloc_error);␊
135}␊
136␊
137//==========================================================================␊
138// execKernel - Load the kernel image (mach-o) and jump to its entry point.␊
139␊
140static int ExecKernel(void *binary)␊
141{␊
142 entry_t kernelEntry;␊
143 int ret;␊
144␊
145 bootArgs->kaddr = bootArgs->ksize = 0;␊
146␊
147 ret = DecodeKernel(binary,␊
148 &kernelEntry,␊
149 (char **) &bootArgs->kaddr,␊
150 (int *)&bootArgs->ksize );␊
151␊
152 if ( ret != 0 )␊
153 return ret;␊
154␊
155 // Reserve space for boot args␊
156 reserveKernBootStruct();␊
157␊
158 // Load boot drivers from the specifed root path.␊
159␊
160 if (!gHaveKernelCache) {␊
161 LoadDrivers("/");␊
162 }␊
163␊
164 clearActivityIndicator();␊
165␊
166 if (gErrors) {␊
167 printf("Errors encountered while starting up the computer.\n");␊
168 printf("Pausing %d seconds...\n", kBootErrorTimeout);␊
169 sleep(kBootErrorTimeout);␊
170 }␊
171␊
172 setupFakeEfi();␊
173␊
174 verbose("Starting Darwin %s\n",( archCpuType == CPU_TYPE_I386 ) ? "x86" : "x86_64");␊
175␊
176 // Cleanup the PXE base code.␊
177␊
178 if ( (gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit ) {␊
179␉␉if ( (ret = nbpUnloadBaseCode()) != nbpStatusSuccess )␊
180 {␊
181 ␉printf("nbpUnloadBaseCode error %d\n", (int) ret);␊
182 sleep(2);␊
183 }␊
184 }␊
185␊
186␉BOOL dummyVal;␊
187␊
188 if (getBoolForKey(kWaitForKeypressKey, &dummyVal, &bootInfo->bootConfig) && dummyVal)␊
189 {␊
190 printf("Press any key to continue...");␊
191 getc();␊
192 }␊
193␊
194 // If we were in text mode, switch to graphics mode.␊
195 // This will draw the boot graphics unless we are in␊
196 // verbose mode.␊
197␊
198 if(gVerboseMode)␊
199 setVideoMode( GRAPHICS_MODE, 0 );␊
200 else␊
201 drawBootGraphics();␊
202␉␊
203 finalizeBootStruct();␊
204 ␊
205 // Jump to kernel's entry point. There's no going back now.␊
206␊
207 startprog( kernelEntry, bootArgs );␊
208␊
209 // Not reached␊
210␊
211 return 0;␊
212}␊
213␊
214//==========================================================================␊
215// Scan and record the system's hardware information.␊
216␊
217static void scanHardware()␊
218{␊
219␉extern void scan_platform();␊
220␊
221␉scan_platform();␊
222}␊
223␊
224/*!␊
225 This is the entrypoint from real-mode which functions exactly as it did before.␊
226 Multiboot does its own runtime initialization, does some of its own things, and then␊
227 calls common_boot.␊
228 */␊
229void boot(int biosdev)␊
230{␊
231 initialize_runtime();␊
232␊
233 // Enable A20 gate before accessing memory above 1Mb.␊
234 enableA20();␊
235␊
236 return common_boot(biosdev);␊
237}␊
238␊
239//==========================================================================␊
240// The 'main' function for the booter. Called by boot0 when booting␊
241// from a block device, or by the network booter.␊
242//␊
243// arguments:␊
244// biosdev - Value passed from boot1/NBP to specify the device␊
245// that the booter was loaded from.␊
246//␊
247// If biosdev is kBIOSDevNetwork, then this function will return if␊
248// booting was unsuccessful. This allows the PXE firmware to try the␊
249// next boot device on its list.␊
250␊
251#define DLOG(x) outb(0x80, (x))␊
252␊
253void common_boot(int biosdev)␊
254{␊
255 int status;␊
256 char *bootFile;␊
257 unsigned long adler32;␊
258 BOOL quiet;␊
259 BOOL firstRun = YES;␊
260 BOOL instantMenu;␊
261 BOOL rescanPrompt;␊
262 unsigned int allowBVFlags = kBVFlagSystemVolume|kBVFlagForeignBoot;␊
263 unsigned int denyBVFlags = kBVFlagEFISystem;␊
264␊
265 // Set reminder to unload the PXE base code. Neglect to unload␊
266 // the base code will result in a hang or kernel panic.␊
267␊
268 gUnloadPXEOnExit = 1;␊
269␊
270 // Record the device that the booter was loaded from.␊
271␊
272 gBIOSDev = biosdev & kBIOSDevMask;␊
273␊
274 // Initialize boot info structure.␊
275␊
276 initKernBootStruct();␊
277␊
278 // Setup VGA text mode.␊
279 // Not sure if it is safe to call setVideoMode() before the␊
280 // config table has been loaded. Call video_mode() instead.␊
281␊
282#if DEBUG␊
283 printf("before video_mode\n");␊
284#endif␊
285 video_mode( 2 ); // 80x25 mono text mode.␊
286#if DEBUG␊
287 printf("after video_mode\n");␊
288#endif␊
289␊
290 // Check to see that this hardware is supported.␊
291 status = checkForSupportedHardware();␊
292 if (status != 0) {␊
293 printf("This hardware configuration is not supported by Darwin/x86. (%d)", status);␊
294 }␊
295␊
296 // First get info for boot volume.␊
297 scanBootVolumes(gBIOSDev, 0);␊
298 bvChain = getBVChainForBIOSDev(gBIOSDev);␊
299 setBootGlobals(bvChain);␊
300 ␊
301 // Load boot.plist config file␊
302 status = loadSystemConfig(&bootInfo->bootConfig);␊
303␊
304 if ( getBoolForKey( kQuietBootKey, &quiet, &bootInfo->bootConfig ) && quiet ) {␊
305 gBootMode |= kBootModeQuiet;␊
306 }␊
307␊
308 // Override firstRun to get to the boot menu instantly by setting "Instant Menu"=y in system config␊
309 if ( getBoolForKey( kInsantMenuKey, &instantMenu, &bootInfo->bootConfig ) && instantMenu ) {␊
310 firstRun = FALSE;␊
311 }␊
312␊
313 // Loading preboot ramdisk if exists.␊
314 loadPrebootRAMDisk();␊
315␊
316 // Disable rescan option by default␊
317 gEnableCDROMRescan = FALSE;␊
318␊
319 // Enable it with Rescan=y in system config␊
320 if ( getBoolForKey( kRescanKey, &gEnableCDROMRescan, &bootInfo->bootConfig ) && gEnableCDROMRescan ) {␊
321 gEnableCDROMRescan = TRUE;␊
322 }␊
323␊
324 // Ask the user for Rescan option by setting "Rescan Prompt"=y in system config.␊
325 rescanPrompt = FALSE;␊
326 if ( getBoolForKey( kRescanPromptKey, &rescanPrompt , &bootInfo->bootConfig ) && rescanPrompt␊
327 && biosDevIsCDROM(gBIOSDev) ) {␊
328 gEnableCDROMRescan = promptForRescanOption();␊
329 }␊
330␊
331 // Enable touching a single BIOS device only if "Scan Single Drive"=y is set in system config.␊
332 if ( getBoolForKey( kScanSingleDriveKey, &gScanSingleDrive, &bootInfo->bootConfig ) && gScanSingleDrive ) {␊
333 gScanSingleDrive = TRUE;␊
334 }␊
335␊
336 // Create a list of partitions on device(s).␊
337 if (gScanSingleDrive)␊
338 scanBootVolumes( gBIOSDev, &bvCount );␊
339 else␊
340 scanDisks( gBIOSDev, &bvCount );␊
341␊
342 // Create a separated bvr chain using the specified filters.␊
343 bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
344␊
345 gBootVolume = selectBootVolume(bvChain);␊
346␊
347#if DEBUG␊
348 printf(" Default: %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBootVolume, gBootVolume->biosdev, gBootVolume->part_no, gBootVolume->flags);␊
349 printf(" bt(0,0): %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBIOSBootVolume, gBIOSBootVolume->biosdev, gBIOSBootVolume->part_no, gBIOSBootVolume->flags);␊
350 getc();␊
351#endif␊
352␊
353␉// Scan hardware configuration.␊
354 scanHardware();␊
355␉␊
356␉// Check if GUI=n switch is present in config file␊
357 if ( getBoolForKey(kGUIKey, &useGUI, &bootInfo->bootConfig) && !useGUI )␊
358 useGUI = FALSE;␊
359␉␉␊
360 // Try initialising the GUI unless disabled␊
361 if( useGUI )␊
362 initGUI();␊
363 ␊
364 // Load boot logo image␊
365 loadBootGraphics();␊
366␊
367 setBootGlobals(bvChain);␊
368 ␊
369 // Parse args, load and start kernel.␊
370 while (1)␊
371 {␊
372 const char *val;␊
373 int len;␊
374 int trycache;␊
375 long flags, cachetime, kerneltime, exttime, sleeptime, time;␊
376 int ret = -1;␊
377 void *binary = (void *)kLoadAddr;␊
378 BOOL tryresume;␊
379 BOOL tryresumedefault;␊
380 BOOL forceresume;␊
381␊
382 config_file_t systemVersion;␉␉// system.plist of booting partition␊
383␊
384 // additional variable for testing alternate kernel image locations on boot helper partitions.␊
385 char bootFileSpec[512];␊
386␉␉␊
387 // Initialize globals.␊
388␊
389 sysConfigValid = 0;␊
390 gErrors = 0;␊
391␊
392 status = getBootOptions(firstRun);␊
393 firstRun = NO;␊
394 if (status == -1) continue;␊
395␉␉ ␊
396 status = processBootOptions();␊
397 // Status==1 means to chainboot␊
398 if ( status == 1 ) break;␊
399 // Status==-1 means that the config file couldn't be loaded or that gBootVolume is NULL␊
400 if ( status == -1 )␊
401 {␊
402 // gBootVolume == NULL usually means the user hit escape.␊
403 if(gBootVolume == NULL)␊
404 {␊
405 freeFilteredBVChain(bvChain);␊
406␊
407 if (gEnableCDROMRescan)␊
408 rescanBIOSDevice(gBIOSDev);␊
409 ␊
410 bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
411 setBootGlobals(bvChain);␊
412 }␊
413 continue;␊
414 }␊
415␉␉␊
416 // Other status (e.g. 0) means that we should proceed with boot.␊
417␉␉␊
418␉␉if( bootArgs->Video.v_display == GRAPHICS_MODE )␊
419␉␉␉drawBackground();␊
420␉␉␉␊
421 // Found and loaded a config file. Proceed with boot.␊
422␊
423␉␉// Turn off any GUI elements␊
424␉␉if( bootArgs->Video.v_display == GRAPHICS_MODE )␊
425␉␉{␊
426␉␉␉gui.devicelist.draw = NO;␊
427␉␉␉gui.bootprompt.draw = NO;␊
428␉␉␉gui.menu.draw = NO;␊
429␉␉␉gui.infobox.draw = NO;␊
430␉␉␉drawBackground();␊
431␉␉␉updateVRAM();␊
432␉␉}␊
433␉␉␊
434␉␉// Find out which version mac os we're booting.␊
435␉␉if (!loadConfigFile("System/Library/CoreServices/SystemVersion.plist", &systemVersion) )␊
436␉␉␉if (getValueForKey("ProductVersion", &val, &len, &systemVersion))␊
437␉␉␉{␉␊
438␉␉␉␉// getValueForKey uses const char for val␊
439␉␉␉␉// so copy it and trim␊
440␉␉␉␉strncpy(gMacOSVersion, val, MIN(len, 4));␊
441␉␉␉␉gMacOSVersion[MIN(len, 4)] = '\0';␊
442␉␉␉}␊
443␉␉␊
444␉␉archCpuType=detectCpuType ();␊
445␉␉if (getValueForKey("arch", &val, &len, &bootInfo->bootConfig))␊
446␉␉{␊
447␉␉␉if(strncmp(val,"x86_64",6) == 0)␊
448␉␉␉␉archCpuType=CPU_TYPE_X86_64;␊
449 ␉␉␉else␊
450␉␉␉␉archCpuType=CPU_TYPE_I386;␊
451␉␉}␊
452␉␉␊
453␉␉if (!getBoolForKey ("Wake", &tryresume, &bootInfo->bootConfig))␊
454␉␉{␊
455␉␉␉tryresume = TRUE;␊
456␉␉␉tryresumedefault = TRUE;␊
457␉␉}␊
458␉␉else␊
459␉␉␉tryresumedefault = FALSE;␊
460␊
461␉␉if (!getBoolForKey ("ForceWake", &forceresume, &bootInfo->bootConfig))␊
462␉␉␉forceresume = FALSE;␊
463␉␉␊
464␉␉if (forceresume)␊
465␉␉{␊
466␉␉␉tryresume = TRUE;␊
467␉␉␉tryresumedefault = FALSE;␊
468␉␉}␊
469␉␉␊
470␉␉while (tryresume) {␊
471␉␉␉const char *tmp;␊
472␉␉␉BVRef bvr;␊
473␉␉␉if (!getValueForKey("WakeImage", &val, &len, &bootInfo->bootConfig))␊
474␉␉␉␉val="/private/var/vm/sleepimage";␊
475␉␉␉␊
476␉␉␉// Do this first to be sure that root volume is mounted␊
477␉␉␉ret = GetFileInfo(0, val, &flags, &sleeptime);␊
478␊
479␉␉␉if ((bvr = getBootVolumeRef(val, &tmp)) == NULL)␊
480␉␉␉␉break;␊
481␉␉␉␊
482␉␉␉// Can't check if it was hibernation Wake=y is required␊
483␉␉␉if (bvr->modTime == 0 && tryresumedefault)␊
484␉␉␉␉break;␊
485␉␉␉␊
486␉␉␉if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat))␊
487␉␉␉␉break;␊
488␉␉␉␊
489␉␉␉if (!forceresume && sleeptime+3<bvr->modTime)␊
490␉␉␉{␊
491␉␉␉␉printf ("Hibernate image is too old by %d seconds. Use ForceWake=y to override\n",bvr->modTime-sleeptime);␊
492␉␉␉␉break;␊
493␉␉␉}␊
494␉␉␉␉␊
495␉␉␉HibernateBoot((char *)val);␊
496␉␉␉break;␊
497␉␉}␊
498␊
499 // Reset cache name.␊
500 bzero(gCacheNameAdler + 64, sizeof(gCacheNameAdler) - 64);␊
501␊
502 sprintf(gCacheNameAdler + 64, "%s,%s", gRootDevice, bootInfo->bootFile);␊
503␊
504 adler32 = Adler32((unsigned char *)gCacheNameAdler, sizeof(gCacheNameAdler));␊
505␊
506 if (getValueForKey(kKernelCacheKey, &val, &len, &bootInfo->bootConfig) == YES) {␊
507 strlcpy(gBootKernelCacheFile, val, len+1);␊
508 } else {␊
509 sprintf(gBootKernelCacheFile, "%s.%08lX", kDefaultCachePath, adler32);␊
510 }␊
511␊
512 // Check for cache file.␊
513 trycache = (((gBootMode & kBootModeSafe) == 0) &&␊
514 (gOverrideKernel == NO) &&␊
515 (gBootFileType == kBlockDeviceType) &&␊
516 (gMKextName[0] == '\0') &&␊
517 (gBootKernelCacheFile[0] != '\0'));␊
518␊
519␉␉verbose("Loading Darwin %s\n", gMacOSVersion);␊
520␉␉␊
521 if (trycache) do {␊
522 ␊
523 // if we haven't found the kernel yet, don't use the cache␊
524 ret = GetFileInfo(NULL, bootInfo->bootFile, &flags, &kerneltime);␊
525 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)) {␊
526 trycache = 0;␊
527 break;␊
528 }␊
529 ret = GetFileInfo(NULL, gBootKernelCacheFile, &flags, &cachetime);␊
530 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)␊
531 || (cachetime < kerneltime)) {␊
532 trycache = 0;␊
533 break;␊
534 }␊
535 ret = GetFileInfo("/System/Library/", "Extensions", &flags, &exttime);␊
536 if ((ret == 0) && ((flags & kFileTypeMask) == kFileTypeDirectory)␊
537 && (cachetime < exttime)) {␊
538 trycache = 0;␊
539 break;␊
540 }␊
541 if (kerneltime > exttime) {␊
542 exttime = kerneltime;␊
543 }␊
544 if (cachetime != (exttime + 1)) {␊
545 trycache = 0;␊
546 break;␊
547 }␊
548 } while (0);␊
549␊
550 do {␊
551 if (trycache) {␊
552 bootFile = gBootKernelCacheFile;␊
553 verbose("Loading kernel cache %s\n", bootFile);␊
554 ret = LoadFile(bootFile);␊
555 binary = (void *)kLoadAddr;␊
556 if (ret >= 0) {␊
557 break;␊
558 }␊
559 }␊
560 bootFile = bootInfo->bootFile;␊
561␊
562 // Try to load kernel image from alternate locations on boot helper partitions.␊
563 sprintf(bootFileSpec, "com.apple.boot.P/%s", bootFile);␊
564 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
565 ␉ ␉ if (ret == -1)␊
566 ␉ ␉ {␊
567 sprintf(bootFileSpec, "com.apple.boot.R/%s", bootFile);␊
568 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
569 if (ret == -1)␊
570 {␊
571 sprintf(bootFileSpec, "com.apple.boot.S/%s", bootFile);␊
572 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
573 if (ret == -1)␊
574 {␊
575 // Not found any alternate locations, using the original kernel image path.␊
576 strcpy(bootFileSpec, bootFile);␊
577 }␊
578 }␊
579 }␊
580 ␉␉␉␊
581 verbose("Loading kernel %s\n", bootFileSpec);␊
582 ret = LoadThinFatFile(bootFileSpec, &binary);␊
583 if (ret <= 0 && archCpuType == CPU_TYPE_X86_64)␊
584 {␊
585 archCpuType = CPU_TYPE_I386;␊
586 ret = LoadThinFatFile(bootFileSpec, &binary);␉␉␉␉␊
587 }␊
588␉␉␉␊
589 } while (0);␊
590␊
591 clearActivityIndicator();␊
592#if DEBUG␊
593 printf("Pausing...");␊
594 sleep(8);␊
595#endif␊
596␊
597 if (ret <= 0)␊
598␉␉{␊
599␉␉␉printf("Can't find %s\n", bootFile);␊
600␊
601␉␉␉if(gui.initialised == YES)␊
602␉␉␉{␊
603␉␉␉␉sleep(1);␊
604␉␉␉␉drawBackground();␊
605␉␉␉␉gui.devicelist.draw = YES;␊
606␉␉␉␉gui.redraw = YES;␊
607␉␉␉}␊
608␉␉␉␉␊
609 if ( gBootFileType == kNetworkDeviceType )␊
610 {␊
611 // Return control back to PXE. Don't unload PXE base code.␊
612 gUnloadPXEOnExit = 0;␊
613 break;␊
614 }␊
615␉␉␉␊
616 } else {␊
617 /* Won't return if successful. */␊
618 ret = ExecKernel(binary);␊
619 }␊
620␊
621 } /* while(1) */␊
622 ␊
623 // chainboot␊
624 if(status==1)␊
625␉if(getVideoMode() == GRAPHICS_MODE) // if we are already in graphics-mode,␊
626␉␉setVideoMode(VGA_TEXT_MODE, 0);␉// switch back to text mode␊
627␉␊
628 if ((gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit) {␊
629␉nbpUnloadBaseCode();␊
630 }␊
631}␊
632␊
633/*!␊
634 Selects a new BIOS device, taking care to update the global state appropriately.␊
635 */␊
636/*␊
637static void selectBiosDevice(void)␊
638{␊
639 struct DiskBVMap *oldMap = diskResetBootVolumes(gBIOSDev);␊
640 CacheReset();␊
641 diskFreeMap(oldMap);␊
642 oldMap = NULL;␊
643␊
644 int dev = selectAlternateBootDevice(gBIOSDev);␊
645␊
646 BVRef bvchain = scanBootVolumes(dev, 0);␊
647 BVRef bootVol = selectBootVolume(bvchain);␊
648 gBootVolume = bootVol;␊
649 setRootVolume(bootVol);␊
650 gBIOSDev = dev;␊
651}␊
652*/␊
653␊
654#define BASE 65521L /* largest prime smaller than 65536 */␊
655#define NMAX 5000␊
656// NMAX (was 5521) the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1␊
657␊
658#define DO1(buf,i) {s1 += buf[i]; s2 += s1;}␊
659#define DO2(buf,i) DO1(buf,i); DO1(buf,i+1);␊
660#define DO4(buf,i) DO2(buf,i); DO2(buf,i+2);␊
661#define DO8(buf,i) DO4(buf,i); DO4(buf,i+4);␊
662#define DO16(buf) DO8(buf,0); DO8(buf,8);␊
663␊
664unsigned long Adler32(unsigned char *buf, long len)␊
665{␊
666 unsigned long s1 = 1; // adler & 0xffff;␊
667 unsigned long s2 = 0; // (adler >> 16) & 0xffff;␊
668 unsigned long result;␊
669 int k;␊
670␊
671 while (len > 0) {␊
672 k = len < NMAX ? len : NMAX;␊
673 len -= k;␊
674 while (k >= 16) {␊
675 DO16(buf);␊
676 buf += 16;␊
677 k -= 16;␊
678 }␊
679 if (k != 0) do {␊
680 s1 += *buf++;␊
681 s2 += s1;␊
682 } while (--k);␊
683 s1 %= BASE;␊
684 s2 %= BASE;␊
685 }␊
686 result = (s2 << 16) | s1;␊
687 return OSSwapHostToBigInt32(result);␊
688}␊
689

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