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Source at commit 145 created 13 years 11 months ago.
By meklort, Kernel patcher works now (patched the kernel too late before)
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␊
62long gBootMode; /* defaults to 0 == kBootModeNormal */␊
63bool gOverrideKernel;␊
64static char gBootKernelCacheFile[512];␊
65static char gCacheNameAdler[64 + 256];␊
66char *gPlatformName = gCacheNameAdler;␊
67char gRootDevice[512];␊
68char gMKextName[512];␊
69char gMacOSVersion[8];␊
70bool gEnableCDROMRescan;␊
71bool gScanSingleDrive;␊
72␊
73int bvCount = 0;␊
74//int␉␉menucount = 0;␊
75int gDeviceCount = 0; ␊
76␊
77BVRef bvr;␊
78BVRef menuBVR;␊
79BVRef bvChain;␊
80bool useGUI;␊
81␊
82//static void selectBiosDevice(void);␊
83static unsigned long Adler32(unsigned char *buffer, long length);␊
84␊
85␊
86static bool gUnloadPXEOnExit = false;␊
87␊
88/*␊
89 * How long to wait (in seconds) to load the␊
90 * kernel after displaying the "boot:" prompt.␊
91 */␊
92#define kBootErrorTimeout 5␊
93␊
94/*␊
95 * Default path to kernel cache file␊
96 */␊
97#define kDefaultCachePath "/System/Library/Caches/com.apple.kernelcaches/kernelcache"␊
98␊
99//==========================================================================␊
100// Zero the BSS.␊
101␊
102static void zeroBSS(void)␊
103{␊
104␉extern char _DATA__bss__begin, _DATA__bss__end;␊
105␉extern char _DATA__common__begin, _DATA__common__end;␊
106␊
107␉bzero(&_DATA__bss__begin, (&_DATA__bss__end - &_DATA__bss__begin));␊
108␉bzero(&_DATA__common__begin, (&_DATA__common__end - &_DATA__common__begin));␊
109}␊
110␊
111//==========================================================================␊
112// Malloc error function␊
113␊
114static void malloc_error(char *addr, size_t size, const char *file, int line)␊
115{␊
116␉stop("\nMemory allocation error! Addr=0x%x, Size=0x%x, File=%s, Line=%d\n", (unsigned)addr, (unsigned)size, file, line);␊
117}␊
118␊
119//==========================================================================␊
120//Initializes the runtime. Right now this means zeroing the BSS and initializing malloc.␊
121//␊
122void initialize_runtime(void)␊
123{␊
124␉zeroBSS();␊
125␉malloc_init(0, 0, 0, malloc_error);␊
126}␊
127␊
128//==========================================================================␊
129// execKernel - Load the kernel image (mach-o) and jump to its entry point.␊
130␊
131static int ExecKernel(void *binary)␊
132{␊
133 entry_t kernelEntry;␊
134 int ret;␊
135␊
136 bootArgs->kaddr = bootArgs->ksize = 0;␊
137␊
138 ret = DecodeKernel(binary,␊
139 &kernelEntry,␊
140 (char **) &bootArgs->kaddr,␊
141 (int *)&bootArgs->ksize );␊
142␊
143 if ( ret != 0 )␊
144 return ret;␊
145␊
146 // Reserve space for boot args␊
147 reserveKernBootStruct();␊
148␊
149 // Load boot drivers from the specifed root path.␊
150␊
151 if (!gHaveKernelCache) {␊
152 LoadDrivers("/");␊
153 }␊
154␊
155 clearActivityIndicator();␊
156␊
157 if (gErrors) {␊
158 printf("Errors encountered while starting up the computer.\n");␊
159 printf("Pausing %d seconds...\n", kBootErrorTimeout);␊
160 sleep(kBootErrorTimeout);␊
161 }␊
162␊
163 setupFakeEfi();␊
164␊
165 verbose("Starting Darwin %s\n",( archCpuType == CPU_TYPE_I386 ) ? "x86" : "x86_64");␊
166␊
167 // Cleanup the PXE base code.␊
168␊
169 if ( (gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit ) {␊
170␉␉if ( (ret = nbpUnloadBaseCode()) != nbpStatusSuccess )␊
171 {␊
172 ␉printf("nbpUnloadBaseCode error %d\n", (int) ret);␊
173 sleep(2);␊
174 }␊
175 }␊
176␊
177 bool dummyVal;␊
178 if (getBoolForKey(kWaitForKeypressKey, &dummyVal, &bootInfo->bootConfig) && dummyVal) {␊
179␉printf("Press any key to continue...");␊
180␉getc();␊
181 }␊
182␊
183 // If we were in text mode, switch to graphics mode.␊
184 // This will draw the boot graphics unless we are in␊
185 // verbose mode.␊
186␊
187 if(gVerboseMode)␊
188 setVideoMode( GRAPHICS_MODE, 0 );␊
189 else␊
190 drawBootGraphics();␊
191␉␊
192 finalizeBootStruct();␊
193 ␊
194 // Jump to kernel's entry point. There's no going back now.␊
195 startprog( kernelEntry, bootArgs );␊
196␊
197 // Not reached␊
198␊
199 return 0;␊
200}␊
201␊
202//==========================================================================␊
203// This is the entrypoint from real-mode which functions exactly as it did␊
204// before. Multiboot does its own runtime initialization, does some of its␊
205// own things, and then calls common_boot.␊
206void boot(int biosdev)␊
207{␊
208␉initialize_runtime();␊
209␉// Enable A20 gate before accessing memory above 1Mb.␊
210␉enableA20();␊
211␉common_boot(biosdev);␊
212}␊
213␊
214//==========================================================================␊
215// The 'main' function for the booter. Called by boot0 when booting␊
216// from a block device, or by the network booter.␊
217//␊
218// arguments:␊
219// biosdev - Value passed from boot1/NBP to specify the device␊
220// that the booter was loaded from.␊
221//␊
222// If biosdev is kBIOSDevNetwork, then this function will return if␊
223// booting was unsuccessful. This allows the PXE firmware to try the␊
224// next boot device on its list.␊
225void common_boot(int biosdev)␊
226{␊
227 int status;␊
228 char *bootFile;␊
229 unsigned long adler32;␊
230 bool quiet;␊
231 bool firstRun = true;␊
232 bool instantMenu;␊
233 bool rescanPrompt;␊
234 unsigned int allowBVFlags = kBVFlagSystemVolume|kBVFlagForeignBoot;␊
235 unsigned int denyBVFlags = kBVFlagEFISystem;␊
236␊
237 // Set reminder to unload the PXE base code. Neglect to unload␊
238 // the base code will result in a hang or kernel panic.␊
239 gUnloadPXEOnExit = true;␊
240␊
241 // Record the device that the booter was loaded from.␊
242 gBIOSDev = biosdev & kBIOSDevMask;␊
243␊
244 // Initialize boot info structure.␊
245 initKernBootStruct();␊
246␊
247 // Setup VGA text mode.␊
248 // Not sure if it is safe to call setVideoMode() before the␊
249 // config table has been loaded. Call video_mode() instead.␊
250#if DEBUG␊
251 printf("before video_mode\n");␊
252#endif␊
253 video_mode( 2 ); // 80x25 mono text mode.␊
254#if DEBUG␊
255 printf("after video_mode\n");␊
256#endif␊
257␊
258 // Scan and record the system's hardware information.␊
259 scan_platform();␊
260␊
261 // First get info for boot volume.␊
262 scanBootVolumes(gBIOSDev, 0);␊
263 bvChain = getBVChainForBIOSDev(gBIOSDev);␊
264 setBootGlobals(bvChain);␊
265 ␊
266 // Load boot.plist config file␊
267 status = loadSystemConfig(&bootInfo->bootConfig);␊
268␊
269 if (getBoolForKey(kQuietBootKey, &quiet, &bootInfo->bootConfig) && quiet) {␊
270 gBootMode |= kBootModeQuiet;␊
271 }␊
272␊
273 // Override firstRun to get to the boot menu instantly by setting "Instant Menu"=y in system config␊
274 if (getBoolForKey(kInsantMenuKey, &instantMenu, &bootInfo->bootConfig) && instantMenu) {␊
275 firstRun = false;␊
276 }␊
277␊
278 // Loading preboot ramdisk if exists.␊
279 loadPrebootRAMDisk();␊
280␊
281 // Disable rescan option by default␊
282 gEnableCDROMRescan = false;␊
283␊
284 // Enable it with Rescan=y in system config␊
285 if (getBoolForKey(kRescanKey, &gEnableCDROMRescan, &bootInfo->bootConfig) && gEnableCDROMRescan) {␊
286 gEnableCDROMRescan = true;␊
287 }␊
288␊
289 // Ask the user for Rescan option by setting "Rescan Prompt"=y in system config.␊
290 rescanPrompt = false;␊
291 if (getBoolForKey(kRescanPromptKey, &rescanPrompt , &bootInfo->bootConfig) && rescanPrompt && biosDevIsCDROM(gBIOSDev)) {␊
292 gEnableCDROMRescan = promptForRescanOption();␊
293 }␊
294␊
295 // Enable touching a single BIOS device only if "Scan Single Drive"=y is set in system config.␊
296 if (getBoolForKey(kScanSingleDriveKey, &gScanSingleDrive, &bootInfo->bootConfig) && gScanSingleDrive) {␊
297 gScanSingleDrive = true;␊
298 }␊
299␊
300 // Create a list of partitions on device(s).␊
301 if (gScanSingleDrive) {␊
302 scanBootVolumes(gBIOSDev, &bvCount);␊
303 } else {␊
304 scanDisks(gBIOSDev, &bvCount);␊
305 }␊
306␊
307 // Create a separated bvr chain using the specified filters.␊
308 bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
309␊
310 gBootVolume = selectBootVolume(bvChain);␊
311␊
312#if DEBUG␊
313 printf(" Default: %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBootVolume, gBootVolume->biosdev, gBootVolume->part_no, gBootVolume->flags);␊
314 printf(" bt(0,0): %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBIOSBootVolume, gBIOSBootVolume->biosdev, gBIOSBootVolume->part_no, gBIOSBootVolume->flags);␊
315 getc();␊
316#endif␊
317␊
318 useGUI = true;␊
319 // Override useGUI default␊
320 getBoolForKey(kGUIKey, &useGUI, &bootInfo->bootConfig);␊
321 if (useGUI) {␊
322 /* XXX AsereBLN handle error */␊
323␉initGUI();␊
324 }␊
325␊
326 setBootGlobals(bvChain);␊
327␊
328 // Parse args, load and start kernel.␊
329 while (1) {␊
330 const char *val;␊
331 int len;␊
332 int trycache;␊
333 long flags, cachetime, kerneltime, exttime, sleeptime, time;␊
334 int ret = -1;␊
335 void *binary = (void *)kLoadAddr;␊
336 bool tryresume;␊
337 bool tryresumedefault;␊
338 bool forceresume;␊
339␊
340 config_file_t systemVersion;␉␉// system.plist of booting partition␊
341␊
342 // additional variable for testing alternate kernel image locations on boot helper partitions.␊
343 char bootFileSpec[512];␊
344␉␉␊
345 // Initialize globals.␊
346␊
347 sysConfigValid = false;␊
348 gErrors = false;␊
349␊
350 status = getBootOptions(firstRun);␊
351 firstRun = false;␊
352 if (status == -1) continue;␊
353␉␉ ␊
354 status = processBootOptions();␊
355 // Status==1 means to chainboot␊
356 if ( status == 1 ) break;␊
357 // Status==-1 means that the config file couldn't be loaded or that gBootVolume is NULL␊
358 if ( status == -1 )␊
359 {␊
360 // gBootVolume == NULL usually means the user hit escape.␊
361 if(gBootVolume == NULL)␊
362 {␊
363 freeFilteredBVChain(bvChain);␊
364␊
365 if (gEnableCDROMRescan)␊
366 rescanBIOSDevice(gBIOSDev);␊
367 ␊
368 bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
369 setBootGlobals(bvChain);␊
370 }␊
371 continue;␊
372 }␊
373␉␉␊
374 // Other status (e.g. 0) means that we should proceed with boot.␊
375␉␉␊
376␉␉if( bootArgs->Video.v_display == GRAPHICS_MODE )␊
377␉␉␉drawBackground();␊
378␉␉␉␊
379 // Found and loaded a config file. Proceed with boot.␊
380␊
381␉␉// Turn off any GUI elements␊
382␉␉if( bootArgs->Video.v_display == GRAPHICS_MODE )␊
383␉␉{␊
384␉␉␉gui.devicelist.draw = false;␊
385␉␉␉gui.bootprompt.draw = false;␊
386␉␉␉gui.menu.draw = false;␊
387␉␉␉gui.infobox.draw = false;␊
388␉␉␉drawBackground();␊
389␉␉␉updateVRAM();␊
390␉␉}␊
391␉␉␊
392␉␉// Find out which version mac os we're booting.␊
393␉␉if (!loadConfigFile("System/Library/CoreServices/SystemVersion.plist", &systemVersion)) {␊
394␉␉␉if (getValueForKey(kProductVersion, &val, &len, &systemVersion)) {␉␊
395␉␉␉␉// getValueForKey uses const char for val␊
396␉␉␉␉// so copy it and trim␊
397␉␉␉␉strncpy(gMacOSVersion, val, MIN(len, 4));␊
398␉␉␉␉gMacOSVersion[MIN(len, 4)] = '\0';␊
399␉␉␉}␊
400␉␉}␊
401␊
402␉␉if (platformCPUFeature(CPU_FEATURE_EM64T)) {␊
403␉␉␉archCpuType = CPU_TYPE_X86_64;␊
404␉␉} else {␊
405␉␉␉archCpuType = CPU_TYPE_I386;␊
406␉␉}␊
407␉␉if (getValueForKey(karch, &val, &len, &bootInfo->bootConfig)) {␊
408␉␉␉if (strncmp(val, "i386", 4) == 0) {␊
409␉␉␉␉archCpuType = CPU_TYPE_I386;␊
410␉␉␉}␊
411␉␉}␊
412␉␉if (getValueForKey(k32BitModeFlag, &val, &len, &bootInfo->bootConfig)) {␊
413␉␉␉archCpuType = CPU_TYPE_I386;␊
414␉␉}␊
415␉␉␊
416␉␉if (!getBoolForKey (kWake, &tryresume, &bootInfo->bootConfig)) {␊
417␉␉␉tryresume = true;␊
418␉␉␉tryresumedefault = true;␊
419␉␉} else {␊
420␉␉␉tryresumedefault = false;␊
421␉␉}␊
422␊
423␉␉if (!getBoolForKey (kForceWake, &forceresume, &bootInfo->bootConfig)) {␊
424␉␉␉forceresume = false;␊
425␉␉}␊
426␉␉␊
427␉␉if (forceresume) {␊
428␉␉␉tryresume = true;␊
429␉␉␉tryresumedefault = false;␊
430␉␉}␊
431␉␉␊
432␉␉while (tryresume) {␊
433␉␉␉const char *tmp;␊
434␉␉␉BVRef bvr;␊
435␉␉␉if (!getValueForKey(kWakeImage, &val, &len, &bootInfo->bootConfig))␊
436␉␉␉␉val="/private/var/vm/sleepimage";␊
437␉␉␉␊
438␉␉␉// Do this first to be sure that root volume is mounted␊
439␉␉␉ret = GetFileInfo(0, val, &flags, &sleeptime);␊
440␊
441␉␉␉if ((bvr = getBootVolumeRef(val, &tmp)) == NULL)␊
442␉␉␉␉break;␊
443␉␉␉␊
444␉␉␉// Can't check if it was hibernation Wake=y is required␊
445␉␉␉if (bvr->modTime == 0 && tryresumedefault)␊
446␉␉␉␉break;␊
447␉␉␉␊
448␉␉␉if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat))␊
449␉␉␉␉break;␊
450␉␉␉␊
451␉␉␉if (!forceresume && ((sleeptime+3)<bvr->modTime)) {␊
452␉␉␉␉printf ("Hibernate image is too old by %d seconds. Use ForceWake=y to override\n",bvr->modTime-sleeptime);␊
453␉␉␉␉break;␊
454␉␉␉}␊
455␉␉␉␉␊
456␉␉␉HibernateBoot((char *)val);␊
457␉␉␉break;␊
458␉␉}␊
459␊
460 // Reset cache name.␊
461 bzero(gCacheNameAdler + 64, sizeof(gCacheNameAdler) - 64);␊
462␊
463 sprintf(gCacheNameAdler + 64, "%s,%s", gRootDevice, bootInfo->bootFile);␊
464␊
465 adler32 = Adler32((unsigned char *)gCacheNameAdler, sizeof(gCacheNameAdler));␊
466␊
467 if (getValueForKey(kKernelCacheKey, &val, &len, &bootInfo->bootConfig)) {␊
468 strlcpy(gBootKernelCacheFile, val, len+1);␊
469 } else {␊
470 sprintf(gBootKernelCacheFile, "%s.%08lX", kDefaultCachePath, adler32);␊
471 }␊
472␊
473 // Check for cache file.␊
474 trycache = (((gBootMode & kBootModeSafe) == 0) &&␊
475 !gOverrideKernel &&␊
476 (gBootFileType == kBlockDeviceType) &&␊
477 (gMKextName[0] == '\0') &&␊
478 (gBootKernelCacheFile[0] != '\0'));␊
479␊
480␉␉verbose("Loading Darwin %s\n", gMacOSVersion);␊
481␉␉␊
482 if (trycache) do {␊
483 ␊
484 // if we haven't found the kernel yet, don't use the cache␊
485 ret = GetFileInfo(NULL, bootInfo->bootFile, &flags, &kerneltime);␊
486 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)) {␊
487 trycache = 0;␊
488 break;␊
489 }␊
490 ret = GetFileInfo(NULL, gBootKernelCacheFile, &flags, &cachetime);␊
491 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)␊
492 || (cachetime < kerneltime)) {␊
493 trycache = 0;␊
494 break;␊
495 }␊
496 ret = GetFileInfo("/System/Library/", "Extensions", &flags, &exttime);␊
497 if ((ret == 0) && ((flags & kFileTypeMask) == kFileTypeDirectory)␊
498 && (cachetime < exttime)) {␊
499 trycache = 0;␊
500 break;␊
501 }␊
502 if (kerneltime > exttime) {␊
503 exttime = kerneltime;␊
504 }␊
505 if (cachetime != (exttime + 1)) {␊
506 trycache = 0;␊
507 break;␊
508 }␊
509 } while (0);␊
510␊
511 do {␊
512 if (trycache) {␊
513 bootFile = gBootKernelCacheFile;␊
514 verbose("Loading kernel cache %s\n", bootFile);␊
515 ret = LoadFile(bootFile);␊
516 binary = (void *)kLoadAddr;␊
517 if (ret >= 0) {␊
518 break;␊
519 }␊
520 }␊
521 bootFile = bootInfo->bootFile;␊
522␊
523 // Try to load kernel image from alternate locations on boot helper partitions.␊
524 sprintf(bootFileSpec, "com.apple.boot.P/%s", bootFile);␊
525 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
526 ␉ ␉ if (ret == -1)␊
527 ␉ ␉ {␊
528 sprintf(bootFileSpec, "com.apple.boot.R/%s", bootFile);␊
529 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
530 if (ret == -1)␊
531 {␊
532 sprintf(bootFileSpec, "com.apple.boot.S/%s", bootFile);␊
533 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
534 if (ret == -1)␊
535 {␊
536 // Not found any alternate locations, using the original kernel image path.␊
537 strcpy(bootFileSpec, bootFile);␊
538 }␊
539 }␊
540 }␊
541 ␉␉␉␊
542 verbose("Loading kernel %s\n", bootFileSpec);␊
543 ret = LoadThinFatFile(bootFileSpec, &binary);␊
544 if (ret <= 0 && archCpuType == CPU_TYPE_X86_64)␊
545 {␊
546 archCpuType = CPU_TYPE_I386;␊
547 ret = LoadThinFatFile(bootFileSpec, &binary);␉␉␉␉␊
548 }␊
549␉␉␉␊
550 } while (0);␊
551␊
552 clearActivityIndicator();␊
553#if DEBUG␊
554 printf("Pausing...");␊
555 sleep(8);␊
556#endif␊
557␊
558 if (ret <= 0) {␊
559␉␉␉printf("Can't find %s\n", bootFile);␊
560␊
561␉␉␉if(gui.initialised) {␊
562␉␉␉␉sleep(1);␊
563␉␉␉␉drawBackground();␊
564␉␉␉␉gui.devicelist.draw = true;␊
565␉␉␉␉gui.redraw = true;␊
566␉␉␉}␊
567 if (gBootFileType == kNetworkDeviceType) {␊
568 // Return control back to PXE. Don't unload PXE base code.␊
569 gUnloadPXEOnExit = false;␊
570 break;␊
571 }␊
572 } else {␊
573 /* Won't return if successful. */␊
574 ret = ExecKernel(binary);␊
575 }␊
576 }␊
577 ␊
578 // chainboot␊
579 if (status==1) {␊
580␉if (getVideoMode() == GRAPHICS_MODE) {␉// if we are already in graphics-mode,␊
581␉␉setVideoMode(VGA_TEXT_MODE, 0);␉// switch back to text mode␊
582␉}␊
583 }␊
584␉␊
585 if ((gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit) {␊
586␉nbpUnloadBaseCode();␊
587 }␊
588}␊
589␊
590/*!␊
591 Selects a new BIOS device, taking care to update the global state appropriately.␊
592 */␊
593/*␊
594static void selectBiosDevice(void)␊
595{␊
596 struct DiskBVMap *oldMap = diskResetBootVolumes(gBIOSDev);␊
597 CacheReset();␊
598 diskFreeMap(oldMap);␊
599 oldMap = NULL;␊
600␊
601 int dev = selectAlternateBootDevice(gBIOSDev);␊
602␊
603 BVRef bvchain = scanBootVolumes(dev, 0);␊
604 BVRef bootVol = selectBootVolume(bvchain);␊
605 gBootVolume = bootVol;␊
606 setRootVolume(bootVol);␊
607 gBIOSDev = dev;␊
608}␊
609*/␊
610␊
611#define BASE 65521L /* largest prime smaller than 65536 */␊
612#define NMAX 5000␊
613// NMAX (was 5521) the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1␊
614␊
615#define DO1(buf,i) {s1 += buf[i]; s2 += s1;}␊
616#define DO2(buf,i) DO1(buf,i); DO1(buf,i+1);␊
617#define DO4(buf,i) DO2(buf,i); DO2(buf,i+2);␊
618#define DO8(buf,i) DO4(buf,i); DO4(buf,i+4);␊
619#define DO16(buf) DO8(buf,0); DO8(buf,8);␊
620␊
621unsigned long Adler32(unsigned char *buf, long len)␊
622{␊
623 unsigned long s1 = 1; // adler & 0xffff;␊
624 unsigned long s2 = 0; // (adler >> 16) & 0xffff;␊
625 unsigned long result;␊
626 int k;␊
627␊
628 while (len > 0) {␊
629 k = len < NMAX ? len : NMAX;␊
630 len -= k;␊
631 while (k >= 16) {␊
632 DO16(buf);␊
633 buf += 16;␊
634 k -= 16;␊
635 }␊
636 if (k != 0) do {␊
637 s1 += *buf++;␊
638 s2 += s1;␊
639 } while (--k);␊
640 s1 %= BASE;␊
641 s2 %= BASE;␊
642 }␊
643 result = (s2 << 16) | s1;␊
644 return OSSwapHostToBigInt32(result);␊
645}␊
646

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