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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 = false;␊
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 bool waitBeforeBoot = FALSE;␊
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 getBoolForKey(kWaitForKeypressKey, &waitBeforeBoot, &bootInfo->bootConfig);␊
156␊
157 // Reserve space for boot args␊
158 reserveKernBootStruct();␊
159␊
160 // Load boot drivers from the specifed root path.␊
161␊
162 if (!gHaveKernelCache) {␊
163 LoadDrivers("/");␊
164 }␊
165␊
166 clearActivityIndicator();␊
167␊
168 setupFakeEfi();␊
169␊
170 if (gErrors) {␊
171 warning("Errors encountered while starting up the computer.\n");␊
172 if (!waitBeforeBoot) {␊
173 printf("Pausing %d seconds...\n", kBootErrorTimeout);␊
174 sleep(kBootErrorTimeout);␊
175 }␊
176 }␊
177␊
178 verbose("Starting Darwin %s arch:%s\n", gMacOSVersion, ( archCpuType == CPU_TYPE_I386 ) ? "x86" : "x86_64");␊
179␊
180 // Cleanup the PXE base code.␊
181␊
182 if ( (gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit ) {␊
183␉␉if ( (ret = nbpUnloadBaseCode()) != nbpStatusSuccess )␊
184 {␊
185 ␉printf("nbpUnloadBaseCode error %d\n", (int) ret);␊
186 sleep(2);␊
187 }␊
188 }␊
189␊
190 if (waitBeforeBoot)␊
191 {␊
192 printf("Press any key to continue...");␊
193 getc();␊
194 }␊
195␊
196 // If we were in text mode, switch to graphics mode.␊
197 // This will draw the boot graphics unless we are in␊
198 // verbose mode.␊
199␊
200 if(gVerboseMode)␊
201 setVideoMode( GRAPHICS_MODE, 0 );␊
202 else␊
203 drawBootGraphics();␊
204␉␊
205 finalizeBootStruct();␊
206 ␊
207 // Jump to kernel's entry point. There's no going back now.␊
208␊
209 startprog( kernelEntry, bootArgs );␊
210␊
211 // Not reached␊
212␊
213 return 0;␊
214}␊
215␊
216//==========================================================================␊
217// Scan and record the system's hardware information.␊
218␊
219static void scanHardware()␊
220{␊
221␉extern void scan_platform();␊
222␊
223␉scan_platform();␊
224}␊
225␊
226/*!␊
227 This is the entrypoint from real-mode which functions exactly as it did before.␊
228 Multiboot does its own runtime initialization, does some of its own things, and then␊
229 calls common_boot.␊
230 */␊
231void boot(int biosdev)␊
232{␊
233 initialize_runtime();␊
234␊
235 // Enable A20 gate before accessing memory above 1Mb.␊
236 enableA20();␊
237␊
238 return common_boot(biosdev);␊
239}␊
240␊
241//==========================================================================␊
242// The 'main' function for the booter. Called by boot0 when booting␊
243// from a block device, or by the network booter.␊
244//␊
245// arguments:␊
246// biosdev - Value passed from boot1/NBP to specify the device␊
247// that the booter was loaded from.␊
248//␊
249// If biosdev is kBIOSDevNetwork, then this function will return if␊
250// booting was unsuccessful. This allows the PXE firmware to try the␊
251// next boot device on its list.␊
252␊
253#define DLOG(x) outb(0x80, (x))␊
254␊
255void common_boot(int biosdev)␊
256{␊
257 int status;␊
258 char *bootFile;␊
259 unsigned long adler32;␊
260 bool quiet;␊
261 bool firstRun = YES;␊
262 bool instantMenu;␊
263 bool rescanPrompt;␊
264 unsigned int allowBVFlags = kBVFlagSystemVolume|kBVFlagForeignBoot;␊
265 unsigned int denyBVFlags = kBVFlagEFISystem;␊
266␊
267 // Set reminder to unload the PXE base code. Neglect to unload␊
268 // the base code will result in a hang or kernel panic.␊
269␊
270 gUnloadPXEOnExit = 1;␊
271␊
272 // Record the device that the booter was loaded from.␊
273␊
274 gBIOSDev = biosdev & kBIOSDevMask;␊
275␊
276 // Initialize boot info structure.␊
277␊
278 initKernBootStruct();␊
279␊
280 // Setup VGA text mode.␊
281 // Not sure if it is safe to call setVideoMode() before the␊
282 // config table has been loaded. Call video_mode() instead.␊
283␊
284#if DEBUG␊
285 printf("before video_mode\n");␊
286#endif␊
287 video_mode( 2 ); // 80x25 mono text mode.␊
288#if DEBUG␊
289 printf("after video_mode\n");␊
290#endif␊
291␊
292 // Check to see that this hardware is supported.␊
293 status = checkForSupportedHardware();␊
294 if (status != 0) {␊
295 printf("This hardware configuration is not supported by Darwin/x86. (%d)", status);␊
296 }␊
297␊
298 // First get info for boot volume.␊
299 scanBootVolumes(gBIOSDev, 0);␊
300 bvChain = getBVChainForBIOSDev(gBIOSDev);␊
301 setBootGlobals(bvChain);␊
302 ␊
303 // Load boot.plist config file␊
304 status = loadSystemConfig(&bootInfo->bootConfig);␊
305␊
306 if ( getBoolForKey( kQuietBootKey, &quiet, &bootInfo->bootConfig ) && quiet ) {␊
307 gBootMode |= kBootModeQuiet;␊
308 }␊
309␊
310 // Override firstRun to get to the boot menu instantly by setting "Instant Menu"=y in system config␊
311 if ( getBoolForKey( kInsantMenuKey, &instantMenu, &bootInfo->bootConfig ) && instantMenu ) {␊
312 firstRun = FALSE;␊
313 }␊
314␊
315 // Loading preboot ramdisk if exists.␊
316 loadPrebootRAMDisk();␊
317␊
318 // Disable rescan option by default␊
319 gEnableCDROMRescan = FALSE;␊
320␊
321 // Enable it with Rescan=y in system config␊
322 if ( getBoolForKey( kRescanKey, &gEnableCDROMRescan, &bootInfo->bootConfig ) && gEnableCDROMRescan ) {␊
323 gEnableCDROMRescan = TRUE;␊
324 }␊
325␊
326 // Ask the user for Rescan option by setting "Rescan Prompt"=y in system config.␊
327 rescanPrompt = FALSE;␊
328 if ( getBoolForKey( kRescanPromptKey, &rescanPrompt , &bootInfo->bootConfig ) && rescanPrompt␊
329 && biosDevIsCDROM(gBIOSDev) ) {␊
330 gEnableCDROMRescan = promptForRescanOption();␊
331 }␊
332␊
333 // Enable touching a single BIOS device only if "Scan Single Drive"=y is set in system config.␊
334 if ( getBoolForKey( kScanSingleDriveKey, &gScanSingleDrive, &bootInfo->bootConfig ) && gScanSingleDrive ) {␊
335 gScanSingleDrive = TRUE;␊
336 }␊
337␊
338 // Create a list of partitions on device(s).␊
339 if (gScanSingleDrive)␊
340 scanBootVolumes( gBIOSDev, &bvCount );␊
341 else␊
342 scanDisks( gBIOSDev, &bvCount );␊
343␊
344 // Create a separated bvr chain using the specified filters.␊
345 bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
346␊
347 gBootVolume = selectBootVolume(bvChain);␊
348␊
349#if DEBUG␊
350 printf(" Default: %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBootVolume, gBootVolume->biosdev, gBootVolume->part_no, gBootVolume->flags);␊
351 printf(" bt(0,0): %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBIOSBootVolume, gBIOSBootVolume->biosdev, gBIOSBootVolume->part_no, gBIOSBootVolume->flags);␊
352 getc();␊
353#endif␊
354␊
355␉// Scan hardware configuration.␊
356 scanHardware();␊
357␉␊
358␉// Check if GUI=n switch is present in config file␊
359 if ( getBoolForKey(kGUIKey, &useGUI, &bootInfo->bootConfig) && !useGUI )␊
360 useGUI = FALSE;␊
361␉␉␊
362 // Try initialising the GUI unless disabled␊
363 if( useGUI )␊
364 initGUI();␊
365 ␊
366 // Load boot logo image␊
367 loadBootGraphics();␊
368␊
369 setBootGlobals(bvChain);␊
370 ␊
371 // Parse args, load and start kernel.␊
372 while (1)␊
373 {␊
374 const char *val;␊
375 int len;␊
376 int trycache;␊
377 long flags, cachetime, kerneltime, exttime, sleeptime, time;␊
378 int ret = -1;␊
379 void *binary = (void *)kLoadAddr;␊
380 bool tryresume;␊
381 bool tryresumedefault;␊
382 bool forceresume;␊
383␊
384 config_file_t systemVersion;␉␉// system.plist of booting partition␊
385␊
386 // additional variable for testing alternate kernel image locations on boot helper partitions.␊
387 char bootFileSpec[512];␊
388␉␉␊
389 // Initialize globals.␊
390␊
391 sysConfigValid = 0;␊
392 gErrors = 0;␊
393␊
394 status = getBootOptions(firstRun);␊
395 firstRun = NO;␊
396 if (status == -1) continue;␊
397␉␉ ␊
398 status = processBootOptions();␊
399 // Status==1 means to chainboot␊
400 if ( status == 1 ) break;␊
401 // Status==-1 means that the config file couldn't be loaded or that gBootVolume is NULL␊
402 if ( status == -1 )␊
403 {␊
404 // gBootVolume == NULL usually means the user hit escape.␊
405 if(gBootVolume == NULL)␊
406 {␊
407 freeFilteredBVChain(bvChain);␊
408␊
409 if (gEnableCDROMRescan)␊
410 rescanBIOSDevice(gBIOSDev);␊
411 ␊
412 bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
413 setBootGlobals(bvChain);␊
414 }␊
415 continue;␊
416 }␊
417␉␉␊
418 // Other status (e.g. 0) means that we should proceed with boot.␊
419␉␉␊
420␉␉if( bootArgs->Video.v_display == GRAPHICS_MODE )␊
421␉␉␉drawBackground();␊
422␉␉␉␊
423 // Found and loaded a config file. Proceed with boot.␊
424␊
425␉␉// Turn off any GUI elements␊
426␉␉if( bootArgs->Video.v_display == GRAPHICS_MODE )␊
427␉␉{␊
428␉␉␉gui.devicelist.draw = NO;␊
429␉␉␉gui.bootprompt.draw = NO;␊
430␉␉␉gui.menu.draw = NO;␊
431␉␉␉gui.infobox.draw = NO;␊
432␉␉␉drawBackground();␊
433␉␉␉updateVRAM();␊
434␉␉}␊
435␉␉␊
436␉␉// Find out which version mac os we're booting.␊
437␉␉if (!loadConfigFile("System/Library/CoreServices/SystemVersion.plist", &systemVersion) )␊
438␉␉␉if (getValueForKey("ProductVersion", &val, &len, &systemVersion))␊
439␉␉␉{␉␊
440␉␉␉␉// getValueForKey uses const char for val␊
441␉␉␉␉// so copy it and trim␊
442␉␉␉␉strncpy(gMacOSVersion, val, MIN(len, 4));␊
443␉␉␉␉gMacOSVersion[MIN(len, 4)] = '\0';␊
444␉␉␉}␊
445␉␉␊
446␉␉archCpuType=detectCpuType ();␊
447␉␉if (getValueForKey("arch", &val, &len, &bootInfo->bootConfig))␊
448␉␉{␊
449␉␉␉if(strncmp(val,"x86_64",6) == 0)␊
450␉␉␉␉archCpuType=CPU_TYPE_X86_64;␊
451 ␉␉␉else␊
452␉␉␉␉archCpuType=CPU_TYPE_I386;␊
453␉␉}␊
454␉␉␊
455␉␉if (!getBoolForKey ("Wake", &tryresume, &bootInfo->bootConfig))␊
456␉␉{␊
457␉␉␉tryresume = TRUE;␊
458␉␉␉tryresumedefault = TRUE;␊
459␉␉}␊
460␉␉else␊
461␉␉␉tryresumedefault = FALSE;␊
462␊
463␉␉if (!getBoolForKey ("ForceWake", &forceresume, &bootInfo->bootConfig))␊
464␉␉␉forceresume = FALSE;␊
465␉␉␊
466␉␉if (forceresume)␊
467␉␉{␊
468␉␉␉tryresume = TRUE;␊
469␉␉␉tryresumedefault = FALSE;␊
470␉␉}␊
471␉␉␊
472␉␉while (tryresume) {␊
473␉␉␉const char *tmp;␊
474␉␉␉BVRef bvr;␊
475␉␉␉if (!getValueForKey("WakeImage", &val, &len, &bootInfo->bootConfig))␊
476␉␉␉␉val="/private/var/vm/sleepimage";␊
477␉␉␉␊
478␉␉␉// Do this first to be sure that root volume is mounted␊
479␉␉␉ret = GetFileInfo(0, val, &flags, &sleeptime);␊
480␊
481␉␉␉if ((bvr = getBootVolumeRef(val, &tmp)) == NULL)␊
482␉␉␉␉break;␊
483␉␉␉␊
484␉␉␉// Can't check if it was hibernation Wake=y is required␊
485␉␉␉if (bvr->modTime == 0 && tryresumedefault)␊
486␉␉␉␉break;␊
487␉␉␉␊
488␉␉␉if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat))␊
489␉␉␉␉break;␊
490␉␉␉␊
491␉␉␉if (!forceresume && sleeptime+3<bvr->modTime)␊
492␉␉␉{␊
493␉␉␉␉printf ("Hibernate image is too old by %d seconds. Use ForceWake=y to override\n",bvr->modTime-sleeptime);␊
494␉␉␉␉break;␊
495␉␉␉}␊
496␉␉␉␉␊
497␉␉␉HibernateBoot((char *)val);␊
498␉␉␉break;␊
499␉␉}␊
500␊
501 // Reset cache name.␊
502 bzero(gCacheNameAdler + 64, sizeof(gCacheNameAdler) - 64);␊
503␊
504 sprintf(gCacheNameAdler + 64, "%s,%s", gRootDevice, bootInfo->bootFile);␊
505␊
506 adler32 = Adler32((unsigned char *)gCacheNameAdler, sizeof(gCacheNameAdler));␊
507␊
508 if (getValueForKey(kKernelCacheKey, &val, &len, &bootInfo->bootConfig) == YES) {␊
509 strlcpy(gBootKernelCacheFile, val, len+1);␊
510 } else {␊
511 sprintf(gBootKernelCacheFile, "%s.%08lX", kDefaultCachePath, adler32);␊
512 }␊
513␊
514 // Check for cache file.␊
515 trycache = (((gBootMode & kBootModeSafe) == 0) &&␊
516 (gOverrideKernel == NO) &&␊
517 (gBootFileType == kBlockDeviceType) &&␊
518 (gMKextName[0] == '\0') &&␊
519 (gBootKernelCacheFile[0] != '\0'));␊
520␊
521␉␉verbose("Loading Darwin %s\n", gMacOSVersion);␊
522␉␉␊
523 if (trycache) do {␊
524 ␊
525 // if we haven't found the kernel yet, don't use the cache␊
526 ret = GetFileInfo(NULL, bootInfo->bootFile, &flags, &kerneltime);␊
527 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)) {␊
528 trycache = 0;␊
529 break;␊
530 }␊
531 ret = GetFileInfo(NULL, gBootKernelCacheFile, &flags, &cachetime);␊
532 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)␊
533 || (cachetime < kerneltime)) {␊
534 trycache = 0;␊
535 break;␊
536 }␊
537 ret = GetFileInfo("/System/Library/", "Extensions", &flags, &exttime);␊
538 if ((ret == 0) && ((flags & kFileTypeMask) == kFileTypeDirectory)␊
539 && (cachetime < exttime)) {␊
540 trycache = 0;␊
541 break;␊
542 }␊
543 if (kerneltime > exttime) {␊
544 exttime = kerneltime;␊
545 }␊
546 if (cachetime != (exttime + 1)) {␊
547 trycache = 0;␊
548 break;␊
549 }␊
550 } while (0);␊
551␊
552 do {␊
553 if (trycache) {␊
554 bootFile = gBootKernelCacheFile;␊
555 verbose("Loading kernel cache %s\n", bootFile);␊
556 ret = LoadFile(bootFile);␊
557 binary = (void *)kLoadAddr;␊
558 if (ret >= 0) {␊
559 break;␊
560 }␊
561 }␊
562 bootFile = bootInfo->bootFile;␊
563␊
564 // Try to load kernel image from alternate locations on boot helper partitions.␊
565 sprintf(bootFileSpec, "com.apple.boot.P/%s", bootFile);␊
566 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
567 ␉ ␉ if (ret == -1)␊
568 ␉ ␉ {␊
569 sprintf(bootFileSpec, "com.apple.boot.R/%s", bootFile);␊
570 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
571 if (ret == -1)␊
572 {␊
573 sprintf(bootFileSpec, "com.apple.boot.S/%s", bootFile);␊
574 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
575 if (ret == -1)␊
576 {␊
577 // Not found any alternate locations, using the original kernel image path.␊
578 strcpy(bootFileSpec, bootFile);␊
579 }␊
580 }␊
581 }␊
582 ␉␉␉␊
583 verbose("Loading kernel %s\n", bootFileSpec);␊
584 ret = LoadThinFatFile(bootFileSpec, &binary);␊
585 if (ret <= 0 && archCpuType == CPU_TYPE_X86_64)␊
586 {␊
587 archCpuType = CPU_TYPE_I386;␊
588 ret = LoadThinFatFile(bootFileSpec, &binary);␉␉␉␉␊
589 }␊
590␉␉␉␊
591 } while (0);␊
592␊
593 clearActivityIndicator();␊
594#if DEBUG␊
595 printf("Pausing...");␊
596 sleep(8);␊
597#endif␊
598␊
599 if (ret <= 0)␊
600␉␉{␊
601␉␉␉printf("Can't find %s\n", bootFile);␊
602␊
603␉␉␉if(gui.initialised == YES)␊
604␉␉␉{␊
605␉␉␉␉sleep(1);␊
606␉␉␉␉drawBackground();␊
607␉␉␉␉gui.devicelist.draw = YES;␊
608␉␉␉␉gui.redraw = YES;␊
609␉␉␉}␊
610␉␉␉␉␊
611 if ( gBootFileType == kNetworkDeviceType )␊
612 {␊
613 // Return control back to PXE. Don't unload PXE base code.␊
614 gUnloadPXEOnExit = 0;␊
615 break;␊
616 }␊
617␉␉␉␊
618 } else {␊
619 /* Won't return if successful. */␊
620 ret = ExecKernel(binary);␊
621 }␊
622␊
623 } /* while(1) */␊
624 ␊
625 // chainboot␊
626 if(status==1)␊
627␉if(getVideoMode() == GRAPHICS_MODE) // if we are already in graphics-mode,␊
628␉␉setVideoMode(VGA_TEXT_MODE, 0);␉// switch back to text mode␊
629␉␊
630 if ((gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit) {␊
631␉nbpUnloadBaseCode();␊
632 }␊
633}␊
634␊
635/*!␊
636 Selects a new BIOS device, taking care to update the global state appropriately.␊
637 */␊
638/*␊
639static void selectBiosDevice(void)␊
640{␊
641 struct DiskBVMap *oldMap = diskResetBootVolumes(gBIOSDev);␊
642 CacheReset();␊
643 diskFreeMap(oldMap);␊
644 oldMap = NULL;␊
645␊
646 int dev = selectAlternateBootDevice(gBIOSDev);␊
647␊
648 BVRef bvchain = scanBootVolumes(dev, 0);␊
649 BVRef bootVol = selectBootVolume(bvchain);␊
650 gBootVolume = bootVol;␊
651 setRootVolume(bootVol);␊
652 gBIOSDev = dev;␊
653}␊
654*/␊
655␊
656#define BASE 65521L /* largest prime smaller than 65536 */␊
657#define NMAX 5000␊
658// NMAX (was 5521) the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1␊
659␊
660#define DO1(buf,i) {s1 += buf[i]; s2 += s1;}␊
661#define DO2(buf,i) DO1(buf,i); DO1(buf,i+1);␊
662#define DO4(buf,i) DO2(buf,i); DO2(buf,i+2);␊
663#define DO8(buf,i) DO4(buf,i); DO4(buf,i+4);␊
664#define DO16(buf) DO8(buf,0); DO8(buf,8);␊
665␊
666unsigned long Adler32(unsigned char *buf, long len)␊
667{␊
668 unsigned long s1 = 1; // adler & 0xffff;␊
669 unsigned long s2 = 0; // (adler >> 16) & 0xffff;␊
670 unsigned long result;␊
671 int k;␊
672␊
673 while (len > 0) {␊
674 k = len < NMAX ? len : NMAX;␊
675 len -= k;␊
676 while (k >= 16) {␊
677 DO16(buf);␊
678 buf += 16;␊
679 k -= 16;␊
680 }␊
681 if (k != 0) do {␊
682 s1 += *buf++;␊
683 s2 += s1;␊
684 } while (--k);␊
685 s1 %= BASE;␊
686 s2 %= BASE;␊
687 }␊
688 result = (s2 << 16) | s1;␊
689 return OSSwapHostToBigInt32(result);␊
690}␊
691

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