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Source at commit 150 created 13 years 11 months ago.
By meklort, USBLecayOff patch. Runs immediately before kernel is started / after last file is loaded
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␊
78BVRef bvr;␊
79BVRef menuBVR;␊
80BVRef bvChain;␊
81bool useGUI;␊
82␊
83//static void selectBiosDevice(void);␊
84static unsigned long Adler32(unsigned char *buffer, long length);␊
85␊
86␊
87static bool gUnloadPXEOnExit = false;␊
88␊
89extern int usb_loop();␊
90/*␊
91 * How long to wait (in seconds) to load the␊
92 * kernel after displaying the "boot:" prompt.␊
93 */␊
94#define kBootErrorTimeout 5␊
95␊
96/*␊
97 * Default path to kernel cache file␊
98 */␊
99#define kDefaultCachePath "/System/Library/Caches/com.apple.kernelcaches/kernelcache"␊
100␊
101//==========================================================================␊
102// Zero the BSS.␊
103␊
104static void zeroBSS(void)␊
105{␊
106␉extern char _DATA__bss__begin, _DATA__bss__end;␊
107␉extern char _DATA__common__begin, _DATA__common__end;␊
108␊
109␉bzero(&_DATA__bss__begin, (&_DATA__bss__end - &_DATA__bss__begin));␊
110␉bzero(&_DATA__common__begin, (&_DATA__common__end - &_DATA__common__begin));␊
111}␊
112␊
113//==========================================================================␊
114// Malloc error function␊
115␊
116static void malloc_error(char *addr, size_t size, const char *file, int line)␊
117{␊
118␉stop("\nMemory allocation error! Addr=0x%x, Size=0x%x, File=%s, Line=%d\n", (unsigned)addr, (unsigned)size, file, line);␊
119}␊
120␊
121//==========================================================================␊
122//Initializes the runtime. Right now this means zeroing the BSS and initializing malloc.␊
123//␊
124void initialize_runtime(void)␊
125{␊
126␉zeroBSS();␊
127␉malloc_init(0, 0, 0, malloc_error);␊
128}␊
129␊
130//==========================================================================␊
131// execKernel - Load the kernel image (mach-o) and jump to its entry point.␊
132␊
133static int ExecKernel(void *binary)␊
134{␊
135 entry_t kernelEntry;␊
136 int ret;␊
137␊
138 bootArgs->kaddr = bootArgs->ksize = 0;␊
139␊
140 ret = DecodeKernel(binary,␊
141 &kernelEntry,␊
142 (char **) &bootArgs->kaddr,␊
143 (int *)&bootArgs->ksize );␊
144␊
145 if ( ret != 0 )␊
146 return ret;␊
147␊
148 // Reserve space for boot args␊
149 reserveKernBootStruct();␊
150␊
151 // Load boot drivers from the specifed root path.␊
152␊
153 if (!gHaveKernelCache) {␊
154 LoadDrivers("/");␊
155 }␊
156␊
157 clearActivityIndicator();␊
158␊
159 if (gErrors) {␊
160 printf("Errors encountered while starting up the computer.\n");␊
161 printf("Pausing %d seconds...\n", kBootErrorTimeout);␊
162 sleep(kBootErrorTimeout);␊
163 }␊
164␊
165 setupFakeEfi();␊
166␊
167 verbose("Starting Darwin %s\n",( archCpuType == CPU_TYPE_I386 ) ? "x86" : "x86_64");␊
168␊
169 // Cleanup the PXE base code.␊
170␊
171 if ( (gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit ) {␊
172␉␉if ( (ret = nbpUnloadBaseCode()) != nbpStatusSuccess )␊
173 {␊
174 ␉printf("nbpUnloadBaseCode error %d\n", (int) ret);␊
175 sleep(2);␊
176 }␊
177 }␊
178␊
179 bool dummyVal;␊
180 if (getBoolForKey(kWaitForKeypressKey, &dummyVal, &bootInfo->bootConfig) && dummyVal) {␊
181␉printf("Press any key to continue...");␊
182␉getc();␊
183 }␊
184␊
185 // If we were in text mode, switch to graphics mode.␊
186 // This will draw the boot graphics unless we are in␊
187 // verbose mode.␊
188␊
189 if(gVerboseMode)␊
190 setVideoMode( GRAPHICS_MODE, 0 );␊
191 else␊
192 drawBootGraphics();␊
193␉␊
194 finalizeBootStruct();␊
195 ␊
196␉usb_loop();␊
197 // Jump to kernel's entry point. There's no going back now.␊
198 startprog( kernelEntry, bootArgs );␊
199␊
200 // Not reached␊
201␊
202 return 0;␊
203}␊
204␊
205//==========================================================================␊
206// This is the entrypoint from real-mode which functions exactly as it did␊
207// before. Multiboot does its own runtime initialization, does some of its␊
208// own things, and then calls common_boot.␊
209void boot(int biosdev)␊
210{␊
211␉initialize_runtime();␊
212␉// Enable A20 gate before accessing memory above 1Mb.␊
213␉enableA20();␊
214␉common_boot(biosdev);␊
215}␊
216␊
217//==========================================================================␊
218// The 'main' function for the booter. Called by boot0 when booting␊
219// from a block device, or by the network booter.␊
220//␊
221// arguments:␊
222// biosdev - Value passed from boot1/NBP to specify the device␊
223// that the booter was loaded from.␊
224//␊
225// If biosdev is kBIOSDevNetwork, then this function will return if␊
226// booting was unsuccessful. This allows the PXE firmware to try the␊
227// next boot device on its list.␊
228void common_boot(int biosdev)␊
229{␊
230 int status;␊
231 char *bootFile;␊
232 unsigned long adler32;␊
233 bool quiet;␊
234 bool firstRun = true;␊
235 bool instantMenu;␊
236 bool rescanPrompt;␊
237 unsigned int allowBVFlags = kBVFlagSystemVolume|kBVFlagForeignBoot;␊
238 unsigned int denyBVFlags = kBVFlagEFISystem;␊
239␊
240 // Set reminder to unload the PXE base code. Neglect to unload␊
241 // the base code will result in a hang or kernel panic.␊
242 gUnloadPXEOnExit = true;␊
243␊
244 // Record the device that the booter was loaded from.␊
245 gBIOSDev = biosdev & kBIOSDevMask;␊
246␊
247 // Initialize boot info structure.␊
248 initKernBootStruct();␊
249␊
250 // Setup VGA text mode.␊
251 // Not sure if it is safe to call setVideoMode() before the␊
252 // config table has been loaded. Call video_mode() instead.␊
253#if DEBUG␊
254 printf("before video_mode\n");␊
255#endif␊
256 video_mode( 2 ); // 80x25 mono text mode.␊
257#if DEBUG␊
258 printf("after video_mode\n");␊
259#endif␊
260␊
261 // Scan and record the system's hardware information.␊
262 scan_platform();␊
263␊
264 // First get info for boot volume.␊
265 scanBootVolumes(gBIOSDev, 0);␊
266 bvChain = getBVChainForBIOSDev(gBIOSDev);␊
267 setBootGlobals(bvChain);␊
268 ␊
269 // Load boot.plist config file␊
270 status = loadSystemConfig(&bootInfo->bootConfig);␊
271␊
272 if (getBoolForKey(kQuietBootKey, &quiet, &bootInfo->bootConfig) && quiet) {␊
273 gBootMode |= kBootModeQuiet;␊
274 }␊
275␊
276 // Override firstRun to get to the boot menu instantly by setting "Instant Menu"=y in system config␊
277 if (getBoolForKey(kInsantMenuKey, &instantMenu, &bootInfo->bootConfig) && instantMenu) {␊
278 firstRun = false;␊
279 }␊
280␊
281 // Loading preboot ramdisk if exists.␊
282 loadPrebootRAMDisk();␊
283␊
284 // Disable rescan option by default␊
285 gEnableCDROMRescan = false;␊
286␊
287 // Enable it with Rescan=y in system config␊
288 if (getBoolForKey(kRescanKey, &gEnableCDROMRescan, &bootInfo->bootConfig) && gEnableCDROMRescan) {␊
289 gEnableCDROMRescan = true;␊
290 }␊
291␊
292 // Ask the user for Rescan option by setting "Rescan Prompt"=y in system config.␊
293 rescanPrompt = false;␊
294 if (getBoolForKey(kRescanPromptKey, &rescanPrompt , &bootInfo->bootConfig) && rescanPrompt && biosDevIsCDROM(gBIOSDev)) {␊
295 gEnableCDROMRescan = promptForRescanOption();␊
296 }␊
297␊
298 // Enable touching a single BIOS device only if "Scan Single Drive"=y is set in system config.␊
299 if (getBoolForKey(kScanSingleDriveKey, &gScanSingleDrive, &bootInfo->bootConfig) && gScanSingleDrive) {␊
300 gScanSingleDrive = true;␊
301 }␊
302␊
303 // Create a list of partitions on device(s).␊
304 if (gScanSingleDrive) {␊
305 scanBootVolumes(gBIOSDev, &bvCount);␊
306 } else {␊
307 scanDisks(gBIOSDev, &bvCount);␊
308 }␊
309␊
310 // Create a separated bvr chain using the specified filters.␊
311 bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
312␊
313 gBootVolume = selectBootVolume(bvChain);␊
314␊
315#if DEBUG␊
316 printf(" Default: %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBootVolume, gBootVolume->biosdev, gBootVolume->part_no, gBootVolume->flags);␊
317 printf(" bt(0,0): %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBIOSBootVolume, gBIOSBootVolume->biosdev, gBIOSBootVolume->part_no, gBIOSBootVolume->flags);␊
318 getc();␊
319#endif␊
320␊
321 useGUI = true;␊
322 // Override useGUI default␊
323 getBoolForKey(kGUIKey, &useGUI, &bootInfo->bootConfig);␊
324 if (useGUI) {␊
325␉␉patchVideoBios();␊
326 /* XXX AsereBLN handle error */␊
327␉␉initGUI();␊
328 }␊
329␊
330 setBootGlobals(bvChain);␊
331␊
332 // Parse args, load and start kernel.␊
333 while (1) {␊
334 const char *val;␊
335 int len;␊
336 int trycache;␊
337 long flags, cachetime, kerneltime, exttime, sleeptime, time;␊
338 int ret = -1;␊
339 void *binary = (void *)kLoadAddr;␊
340 bool tryresume;␊
341 bool tryresumedefault;␊
342 bool forceresume;␊
343␊
344 config_file_t systemVersion;␉␉// system.plist of booting partition␊
345␊
346 // additional variable for testing alternate kernel image locations on boot helper partitions.␊
347 char bootFileSpec[512];␊
348␉␉␊
349 // Initialize globals.␊
350␊
351 sysConfigValid = false;␊
352 gErrors = false;␊
353␊
354 status = getBootOptions(firstRun);␊
355 firstRun = false;␊
356 if (status == -1) continue;␊
357␉␉ ␊
358 status = processBootOptions();␊
359 // Status==1 means to chainboot␊
360 if ( status == 1 ) break;␊
361 // Status==-1 means that the config file couldn't be loaded or that gBootVolume is NULL␊
362 if ( status == -1 )␊
363 {␊
364 // gBootVolume == NULL usually means the user hit escape.␊
365 if(gBootVolume == NULL)␊
366 {␊
367 freeFilteredBVChain(bvChain);␊
368␊
369 if (gEnableCDROMRescan)␊
370 rescanBIOSDevice(gBIOSDev);␊
371 ␊
372 bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
373 setBootGlobals(bvChain);␊
374 }␊
375 continue;␊
376 }␊
377␉␉␊
378 // Other status (e.g. 0) means that we should proceed with boot.␊
379␉␉␊
380␉␉if( bootArgs->Video.v_display == GRAPHICS_MODE )␊
381␉␉␉drawBackground();␊
382␉␉␉␊
383 // Found and loaded a config file. Proceed with boot.␊
384␊
385␉␉// Turn off any GUI elements␊
386␉␉if( bootArgs->Video.v_display == GRAPHICS_MODE )␊
387␉␉{␊
388␉␉␉gui.devicelist.draw = false;␊
389␉␉␉gui.bootprompt.draw = false;␊
390␉␉␉gui.menu.draw = false;␊
391␉␉␉gui.infobox.draw = false;␊
392␉␉␉drawBackground();␊
393␉␉␉updateVRAM();␊
394␉␉}␊
395␉␉␊
396␉␉// Find out which version mac os we're booting.␊
397␉␉if (!loadConfigFile("System/Library/CoreServices/SystemVersion.plist", &systemVersion)) {␊
398␉␉␉if (getValueForKey(kProductVersion, &val, &len, &systemVersion)) {␉␊
399␉␉␉␉// getValueForKey uses const char for val␊
400␉␉␉␉// so copy it and trim␊
401␉␉␉␉strncpy(gMacOSVersion, val, MIN(len, 4));␊
402␉␉␉␉gMacOSVersion[MIN(len, 4)] = '\0';␊
403␉␉␉}␊
404␉␉}␊
405␊
406␉␉if (platformCPUFeature(CPU_FEATURE_EM64T)) {␊
407␉␉␉archCpuType = CPU_TYPE_X86_64;␊
408␉␉} else {␊
409␉␉␉archCpuType = CPU_TYPE_I386;␊
410␉␉}␊
411␉␉if (getValueForKey(karch, &val, &len, &bootInfo->bootConfig)) {␊
412␉␉␉if (strncmp(val, "i386", 4) == 0) {␊
413␉␉␉␉archCpuType = CPU_TYPE_I386;␊
414␉␉␉}␊
415␉␉}␊
416␉␉if (getValueForKey(k32BitModeFlag, &val, &len, &bootInfo->bootConfig)) {␊
417␉␉␉archCpuType = CPU_TYPE_I386;␊
418␉␉}␊
419␉␉␊
420␉␉if (!getBoolForKey (kWake, &tryresume, &bootInfo->bootConfig)) {␊
421␉␉␉tryresume = true;␊
422␉␉␉tryresumedefault = true;␊
423␉␉} else {␊
424␉␉␉tryresumedefault = false;␊
425␉␉}␊
426␊
427␉␉if (!getBoolForKey (kForceWake, &forceresume, &bootInfo->bootConfig)) {␊
428␉␉␉forceresume = false;␊
429␉␉}␊
430␉␉␊
431␉␉if (forceresume) {␊
432␉␉␉tryresume = true;␊
433␉␉␉tryresumedefault = false;␊
434␉␉}␊
435␉␉␊
436␉␉while (tryresume) {␊
437␉␉␉const char *tmp;␊
438␉␉␉BVRef bvr;␊
439␉␉␉if (!getValueForKey(kWakeImage, &val, &len, &bootInfo->bootConfig))␊
440␉␉␉␉val="/private/var/vm/sleepimage";␊
441␉␉␉␊
442␉␉␉// Do this first to be sure that root volume is mounted␊
443␉␉␉ret = GetFileInfo(0, val, &flags, &sleeptime);␊
444␊
445␉␉␉if ((bvr = getBootVolumeRef(val, &tmp)) == NULL)␊
446␉␉␉␉break;␊
447␉␉␉␊
448␉␉␉// Can't check if it was hibernation Wake=y is required␊
449␉␉␉if (bvr->modTime == 0 && tryresumedefault)␊
450␉␉␉␉break;␊
451␉␉␉␊
452␉␉␉if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat))␊
453␉␉␉␉break;␊
454␉␉␉␊
455␉␉␉if (!forceresume && ((sleeptime+3)<bvr->modTime)) {␊
456␉␉␉␉printf ("Hibernate image is too old by %d seconds. Use ForceWake=y to override\n",bvr->modTime-sleeptime);␊
457␉␉␉␉break;␊
458␉␉␉}␊
459␉␉␉␉␊
460␉␉␉HibernateBoot((char *)val);␊
461␉␉␉break;␊
462␉␉}␊
463␊
464 // Reset cache name.␊
465 bzero(gCacheNameAdler + 64, sizeof(gCacheNameAdler) - 64);␊
466␊
467 sprintf(gCacheNameAdler + 64, "%s,%s", gRootDevice, bootInfo->bootFile);␊
468␊
469 adler32 = Adler32((unsigned char *)gCacheNameAdler, sizeof(gCacheNameAdler));␊
470␊
471 if (getValueForKey(kKernelCacheKey, &val, &len, &bootInfo->bootConfig)) {␊
472 strlcpy(gBootKernelCacheFile, val, len+1);␊
473 } else {␊
474 sprintf(gBootKernelCacheFile, "%s.%08lX", kDefaultCachePath, adler32);␊
475 }␊
476␊
477 // Check for cache file.␊
478 trycache = (((gBootMode & kBootModeSafe) == 0) &&␊
479 !gOverrideKernel &&␊
480 (gBootFileType == kBlockDeviceType) &&␊
481 (gMKextName[0] == '\0') &&␊
482 (gBootKernelCacheFile[0] != '\0'));␊
483␊
484␉␉verbose("Loading Darwin %s\n", gMacOSVersion);␊
485␉␉␊
486 if (trycache) do {␊
487 ␊
488 // if we haven't found the kernel yet, don't use the cache␊
489 ret = GetFileInfo(NULL, bootInfo->bootFile, &flags, &kerneltime);␊
490 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)) {␊
491 trycache = 0;␊
492 break;␊
493 }␊
494 ret = GetFileInfo(NULL, gBootKernelCacheFile, &flags, &cachetime);␊
495 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)␊
496 || (cachetime < kerneltime)) {␊
497 trycache = 0;␊
498 break;␊
499 }␊
500 ret = GetFileInfo("/System/Library/", "Extensions", &flags, &exttime);␊
501 if ((ret == 0) && ((flags & kFileTypeMask) == kFileTypeDirectory)␊
502 && (cachetime < exttime)) {␊
503 trycache = 0;␊
504 break;␊
505 }␊
506 if (kerneltime > exttime) {␊
507 exttime = kerneltime;␊
508 }␊
509 if (cachetime != (exttime + 1)) {␊
510 trycache = 0;␊
511 break;␊
512 }␊
513 } while (0);␊
514␊
515 do {␊
516 if (trycache) {␊
517 bootFile = gBootKernelCacheFile;␊
518 verbose("Loading kernel cache %s\n", bootFile);␊
519 ret = LoadFile(bootFile);␊
520 binary = (void *)kLoadAddr;␊
521 if (ret >= 0) {␊
522 break;␊
523 }␊
524 }␊
525 bootFile = bootInfo->bootFile;␊
526␊
527 // Try to load kernel image from alternate locations on boot helper partitions.␊
528 sprintf(bootFileSpec, "com.apple.boot.P/%s", bootFile);␊
529 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
530 ␉ ␉ if (ret == -1)␊
531 ␉ ␉ {␊
532 sprintf(bootFileSpec, "com.apple.boot.R/%s", bootFile);␊
533 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
534 if (ret == -1)␊
535 {␊
536 sprintf(bootFileSpec, "com.apple.boot.S/%s", bootFile);␊
537 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
538 if (ret == -1)␊
539 {␊
540 // Not found any alternate locations, using the original kernel image path.␊
541 strcpy(bootFileSpec, bootFile);␊
542 }␊
543 }␊
544 }␊
545 ␉␉␉␊
546 verbose("Loading kernel %s\n", bootFileSpec);␊
547 ret = LoadThinFatFile(bootFileSpec, &binary);␊
548 if (ret <= 0 && archCpuType == CPU_TYPE_X86_64)␊
549 {␊
550 archCpuType = CPU_TYPE_I386;␊
551 ret = LoadThinFatFile(bootFileSpec, &binary);␉␉␉␉␊
552 }␊
553␉␉␉␊
554 } while (0);␊
555␊
556 clearActivityIndicator();␊
557#if DEBUG␊
558 printf("Pausing...");␊
559 sleep(8);␊
560#endif␊
561␊
562 if (ret <= 0) {␊
563␉␉␉printf("Can't find %s\n", bootFile);␊
564␊
565␉␉␉if(gui.initialised) {␊
566␉␉␉␉sleep(1);␊
567␉␉␉␉drawBackground();␊
568␉␉␉␉gui.devicelist.draw = true;␊
569␉␉␉␉gui.redraw = true;␊
570␉␉␉}␊
571 if (gBootFileType == kNetworkDeviceType) {␊
572 // Return control back to PXE. Don't unload PXE base code.␊
573 gUnloadPXEOnExit = false;␊
574 break;␊
575 }␊
576 } else {␊
577 /* Won't return if successful. */␊
578 ret = ExecKernel(binary);␊
579 }␊
580 }␊
581 ␊
582 // chainboot␊
583 if (status==1) {␊
584␉if (getVideoMode() == GRAPHICS_MODE) {␉// if we are already in graphics-mode,␊
585␉␉setVideoMode(VGA_TEXT_MODE, 0);␉// switch back to text mode␊
586␉}␊
587 }␊
588␉␊
589 if ((gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit) {␊
590␉nbpUnloadBaseCode();␊
591 }␊
592}␊
593␊
594/*!␊
595 Selects a new BIOS device, taking care to update the global state appropriately.␊
596 */␊
597/*␊
598static void selectBiosDevice(void)␊
599{␊
600 struct DiskBVMap *oldMap = diskResetBootVolumes(gBIOSDev);␊
601 CacheReset();␊
602 diskFreeMap(oldMap);␊
603 oldMap = NULL;␊
604␊
605 int dev = selectAlternateBootDevice(gBIOSDev);␊
606␊
607 BVRef bvchain = scanBootVolumes(dev, 0);␊
608 BVRef bootVol = selectBootVolume(bvchain);␊
609 gBootVolume = bootVol;␊
610 setRootVolume(bootVol);␊
611 gBIOSDev = dev;␊
612}␊
613*/␊
614␊
615#define BASE 65521L /* largest prime smaller than 65536 */␊
616#define NMAX 5000␊
617// NMAX (was 5521) the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1␊
618␊
619#define DO1(buf,i) {s1 += buf[i]; s2 += s1;}␊
620#define DO2(buf,i) DO1(buf,i); DO1(buf,i+1);␊
621#define DO4(buf,i) DO2(buf,i); DO2(buf,i+2);␊
622#define DO8(buf,i) DO4(buf,i); DO4(buf,i+4);␊
623#define DO16(buf) DO8(buf,0); DO8(buf,8);␊
624␊
625unsigned long Adler32(unsigned char *buf, long len)␊
626{␊
627 unsigned long s1 = 1; // adler & 0xffff;␊
628 unsigned long s2 = 0; // (adler >> 16) & 0xffff;␊
629 unsigned long result;␊
630 int k;␊
631␊
632 while (len > 0) {␊
633 k = len < NMAX ? len : NMAX;␊
634 len -= k;␊
635 while (k >= 16) {␊
636 DO16(buf);␊
637 buf += 16;␊
638 k -= 16;␊
639 }␊
640 if (k != 0) do {␊
641 s1 += *buf++;␊
642 s2 += s1;␊
643 } while (--k);␊
644 s1 %= BASE;␊
645 s2 %= BASE;␊
646 }␊
647 result = (s2 << 16) | s1;␊
648 return OSSwapHostToBigInt32(result);␊
649}␊
650

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