Chameleon

Chameleon Svn Source Tree

Root/trunk/i386/boot2/boot.c

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␉usb_loop();␊
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 // Jump to kernel's entry point. There's no going back now.␊
197␊
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 /* XXX AsereBLN handle error */␊
326␉initGUI();␊
327 }␊
328␊
329 setBootGlobals(bvChain);␊
330␊
331 // Parse args, load and start kernel.␊
332 while (1) {␊
333 const char *val;␊
334 int len;␊
335 int trycache;␊
336 long flags, cachetime, kerneltime, exttime, sleeptime, time;␊
337 int ret = -1;␊
338 void *binary = (void *)kLoadAddr;␊
339 bool tryresume;␊
340 bool tryresumedefault;␊
341 bool forceresume;␊
342␊
343 config_file_t systemVersion;␉␉// system.plist of booting partition␊
344␊
345 // additional variable for testing alternate kernel image locations on boot helper partitions.␊
346 char bootFileSpec[512];␊
347␉␉␊
348 // Initialize globals.␊
349␊
350 sysConfigValid = false;␊
351 gErrors = false;␊
352␊
353 status = getBootOptions(firstRun);␊
354 firstRun = false;␊
355 if (status == -1) continue;␊
356␉␉ ␊
357 status = processBootOptions();␊
358 // Status==1 means to chainboot␊
359 if ( status == 1 ) break;␊
360 // Status==-1 means that the config file couldn't be loaded or that gBootVolume is NULL␊
361 if ( status == -1 )␊
362 {␊
363 // gBootVolume == NULL usually means the user hit escape.␊
364 if(gBootVolume == NULL)␊
365 {␊
366 freeFilteredBVChain(bvChain);␊
367␊
368 if (gEnableCDROMRescan)␊
369 rescanBIOSDevice(gBIOSDev);␊
370 ␊
371 bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
372 setBootGlobals(bvChain);␊
373 }␊
374 continue;␊
375 }␊
376␉␉␊
377 // Other status (e.g. 0) means that we should proceed with boot.␊
378␉␉␊
379␉␉if( bootArgs->Video.v_display == GRAPHICS_MODE )␊
380␉␉␉drawBackground();␊
381␉␉␉␊
382 // Found and loaded a config file. Proceed with boot.␊
383␊
384␉␉// Turn off any GUI elements␊
385␉␉if( bootArgs->Video.v_display == GRAPHICS_MODE )␊
386␉␉{␊
387␉␉␉gui.devicelist.draw = false;␊
388␉␉␉gui.bootprompt.draw = false;␊
389␉␉␉gui.menu.draw = false;␊
390␉␉␉gui.infobox.draw = false;␊
391␉␉␉drawBackground();␊
392␉␉␉updateVRAM();␊
393␉␉}␊
394␉␉␊
395␉␉// Find out which version mac os we're booting.␊
396␉␉if (!loadConfigFile("System/Library/CoreServices/SystemVersion.plist", &systemVersion)) {␊
397␉␉␉if (getValueForKey(kProductVersion, &val, &len, &systemVersion)) {␉␊
398␉␉␉␉// getValueForKey uses const char for val␊
399␉␉␉␉// so copy it and trim␊
400␉␉␉␉strncpy(gMacOSVersion, val, MIN(len, 4));␊
401␉␉␉␉gMacOSVersion[MIN(len, 4)] = '\0';␊
402␉␉␉}␊
403␉␉}␊
404␊
405␉␉if (platformCPUFeature(CPU_FEATURE_EM64T)) {␊
406␉␉␉archCpuType = CPU_TYPE_X86_64;␊
407␉␉} else {␊
408␉␉␉archCpuType = CPU_TYPE_I386;␊
409␉␉}␊
410␉␉if (getValueForKey(karch, &val, &len, &bootInfo->bootConfig)) {␊
411␉␉␉if (strncmp(val, "i386", 4) == 0) {␊
412␉␉␉␉archCpuType = CPU_TYPE_I386;␊
413␉␉␉}␊
414␉␉}␊
415␉␉if (getValueForKey(k32BitModeFlag, &val, &len, &bootInfo->bootConfig)) {␊
416␉␉␉archCpuType = CPU_TYPE_I386;␊
417␉␉}␊
418␉␉␊
419␉␉if (!getBoolForKey (kWake, &tryresume, &bootInfo->bootConfig)) {␊
420␉␉␉tryresume = true;␊
421␉␉␉tryresumedefault = true;␊
422␉␉} else {␊
423␉␉␉tryresumedefault = false;␊
424␉␉}␊
425␊
426␉␉if (!getBoolForKey (kForceWake, &forceresume, &bootInfo->bootConfig)) {␊
427␉␉␉forceresume = false;␊
428␉␉}␊
429␉␉␊
430␉␉if (forceresume) {␊
431␉␉␉tryresume = true;␊
432␉␉␉tryresumedefault = false;␊
433␉␉}␊
434␉␉␊
435␉␉while (tryresume) {␊
436␉␉␉const char *tmp;␊
437␉␉␉BVRef bvr;␊
438␉␉␉if (!getValueForKey(kWakeImage, &val, &len, &bootInfo->bootConfig))␊
439␉␉␉␉val="/private/var/vm/sleepimage";␊
440␉␉␉␊
441␉␉␉// Do this first to be sure that root volume is mounted␊
442␉␉␉ret = GetFileInfo(0, val, &flags, &sleeptime);␊
443␊
444␉␉␉if ((bvr = getBootVolumeRef(val, &tmp)) == NULL)␊
445␉␉␉␉break;␊
446␉␉␉␊
447␉␉␉// Can't check if it was hibernation Wake=y is required␊
448␉␉␉if (bvr->modTime == 0 && tryresumedefault)␊
449␉␉␉␉break;␊
450␉␉␉␊
451␉␉␉if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat))␊
452␉␉␉␉break;␊
453␉␉␉␊
454␉␉␉if (!forceresume && ((sleeptime+3)<bvr->modTime)) {␊
455␉␉␉␉printf ("Hibernate image is too old by %d seconds. Use ForceWake=y to override\n",bvr->modTime-sleeptime);␊
456␉␉␉␉break;␊
457␉␉␉}␊
458␉␉␉␉␊
459␉␉␉HibernateBoot((char *)val);␊
460␉␉␉break;␊
461␉␉}␊
462␊
463 // Reset cache name.␊
464 bzero(gCacheNameAdler + 64, sizeof(gCacheNameAdler) - 64);␊
465␊
466 sprintf(gCacheNameAdler + 64, "%s,%s", gRootDevice, bootInfo->bootFile);␊
467␊
468 adler32 = Adler32((unsigned char *)gCacheNameAdler, sizeof(gCacheNameAdler));␊
469␊
470 if (getValueForKey(kKernelCacheKey, &val, &len, &bootInfo->bootConfig)) {␊
471 strlcpy(gBootKernelCacheFile, val, len+1);␊
472 } else {␊
473 sprintf(gBootKernelCacheFile, "%s.%08lX", kDefaultCachePath, adler32);␊
474 }␊
475␊
476 // Check for cache file.␊
477 trycache = (((gBootMode & kBootModeSafe) == 0) &&␊
478 !gOverrideKernel &&␊
479 (gBootFileType == kBlockDeviceType) &&␊
480 (gMKextName[0] == '\0') &&␊
481 (gBootKernelCacheFile[0] != '\0'));␊
482␊
483␉␉verbose("Loading Darwin %s\n", gMacOSVersion);␊
484␉␉␊
485 if (trycache) do {␊
486 ␊
487 // if we haven't found the kernel yet, don't use the cache␊
488 ret = GetFileInfo(NULL, bootInfo->bootFile, &flags, &kerneltime);␊
489 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)) {␊
490 trycache = 0;␊
491 break;␊
492 }␊
493 ret = GetFileInfo(NULL, gBootKernelCacheFile, &flags, &cachetime);␊
494 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)␊
495 || (cachetime < kerneltime)) {␊
496 trycache = 0;␊
497 break;␊
498 }␊
499 ret = GetFileInfo("/System/Library/", "Extensions", &flags, &exttime);␊
500 if ((ret == 0) && ((flags & kFileTypeMask) == kFileTypeDirectory)␊
501 && (cachetime < exttime)) {␊
502 trycache = 0;␊
503 break;␊
504 }␊
505 if (kerneltime > exttime) {␊
506 exttime = kerneltime;␊
507 }␊
508 if (cachetime != (exttime + 1)) {␊
509 trycache = 0;␊
510 break;␊
511 }␊
512 } while (0);␊
513␊
514 do {␊
515 if (trycache) {␊
516 bootFile = gBootKernelCacheFile;␊
517 verbose("Loading kernel cache %s\n", bootFile);␊
518 ret = LoadFile(bootFile);␊
519 binary = (void *)kLoadAddr;␊
520 if (ret >= 0) {␊
521 break;␊
522 }␊
523 }␊
524 bootFile = bootInfo->bootFile;␊
525␊
526 // Try to load kernel image from alternate locations on boot helper partitions.␊
527 sprintf(bootFileSpec, "com.apple.boot.P/%s", bootFile);␊
528 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
529 ␉ ␉ if (ret == -1)␊
530 ␉ ␉ {␊
531 sprintf(bootFileSpec, "com.apple.boot.R/%s", bootFile);␊
532 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
533 if (ret == -1)␊
534 {␊
535 sprintf(bootFileSpec, "com.apple.boot.S/%s", bootFile);␊
536 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
537 if (ret == -1)␊
538 {␊
539 // Not found any alternate locations, using the original kernel image path.␊
540 strcpy(bootFileSpec, bootFile);␊
541 }␊
542 }␊
543 }␊
544 ␉␉␉␊
545 verbose("Loading kernel %s\n", bootFileSpec);␊
546 ret = LoadThinFatFile(bootFileSpec, &binary);␊
547 if (ret <= 0 && archCpuType == CPU_TYPE_X86_64)␊
548 {␊
549 archCpuType = CPU_TYPE_I386;␊
550 ret = LoadThinFatFile(bootFileSpec, &binary);␉␉␉␉␊
551 }␊
552␉␉␉␊
553 } while (0);␊
554␊
555 clearActivityIndicator();␊
556#if DEBUG␊
557 printf("Pausing...");␊
558 sleep(8);␊
559#endif␊
560␊
561 if (ret <= 0) {␊
562␉␉␉printf("Can't find %s\n", bootFile);␊
563␊
564␉␉␉if(gui.initialised) {␊
565␉␉␉␉sleep(1);␊
566␉␉␉␉drawBackground();␊
567␉␉␉␉gui.devicelist.draw = true;␊
568␉␉␉␉gui.redraw = true;␊
569␉␉␉}␊
570 if (gBootFileType == kNetworkDeviceType) {␊
571 // Return control back to PXE. Don't unload PXE base code.␊
572 gUnloadPXEOnExit = false;␊
573 break;␊
574 }␊
575 } else {␊
576 /* Won't return if successful. */␊
577 ret = ExecKernel(binary);␊
578 }␊
579 }␊
580 ␊
581 // chainboot␊
582 if (status==1) {␊
583␉if (getVideoMode() == GRAPHICS_MODE) {␉// if we are already in graphics-mode,␊
584␉␉setVideoMode(VGA_TEXT_MODE, 0);␉// switch back to text mode␊
585␉}␊
586 }␊
587␉␊
588 if ((gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit) {␊
589␉nbpUnloadBaseCode();␊
590 }␊
591}␊
592␊
593/*!␊
594 Selects a new BIOS device, taking care to update the global state appropriately.␊
595 */␊
596/*␊
597static void selectBiosDevice(void)␊
598{␊
599 struct DiskBVMap *oldMap = diskResetBootVolumes(gBIOSDev);␊
600 CacheReset();␊
601 diskFreeMap(oldMap);␊
602 oldMap = NULL;␊
603␊
604 int dev = selectAlternateBootDevice(gBIOSDev);␊
605␊
606 BVRef bvchain = scanBootVolumes(dev, 0);␊
607 BVRef bootVol = selectBootVolume(bvchain);␊
608 gBootVolume = bootVol;␊
609 setRootVolume(bootVol);␊
610 gBIOSDev = dev;␊
611}␊
612*/␊
613␊
614#define BASE 65521L /* largest prime smaller than 65536 */␊
615#define NMAX 5000␊
616// NMAX (was 5521) the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1␊
617␊
618#define DO1(buf,i) {s1 += buf[i]; s2 += s1;}␊
619#define DO2(buf,i) DO1(buf,i); DO1(buf,i+1);␊
620#define DO4(buf,i) DO2(buf,i); DO2(buf,i+2);␊
621#define DO8(buf,i) DO4(buf,i); DO4(buf,i+4);␊
622#define DO16(buf) DO8(buf,0); DO8(buf,8);␊
623␊
624unsigned long Adler32(unsigned char *buf, long len)␊
625{␊
626 unsigned long s1 = 1; // adler & 0xffff;␊
627 unsigned long s2 = 0; // (adler >> 16) & 0xffff;␊
628 unsigned long result;␊
629 int k;␊
630␊
631 while (len > 0) {␊
632 k = len < NMAX ? len : NMAX;␊
633 len -= k;␊
634 while (k >= 16) {␊
635 DO16(buf);␊
636 buf += 16;␊
637 k -= 16;␊
638 }␊
639 if (k != 0) do {␊
640 s1 += *buf++;␊
641 s2 += s1;␊
642 } while (--k);␊
643 s1 %= BASE;␊
644 s2 %= BASE;␊
645 }␊
646 result = (s2 << 16) | s1;␊
647 return OSSwapHostToBigInt32(result);␊
648}␊
649

Archive Download this file

Revision: 203