Chameleon

Chameleon Svn Source Tree

Root/branches/meklort/i386/boot2/boot.c

Source at commit 251 created 13 years 9 months ago.
By meklort, Make md0 image user selectable. Falls back to Postboot.img
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␊
78bool␉recoveryMode = false;␊
79␊
80BVRef bvr;␊
81BVRef menuBVR;␊
82BVRef bvChain;␊
83bool useGUI;␊
84␊
85//static void selectBiosDevice(void);␊
86static unsigned long Adler32(unsigned char *buffer, long length);␊
87␊
88␊
89static bool gUnloadPXEOnExit = false;␊
90␊
91/*␊
92 * How long to wait (in seconds) to load the␊
93 * kernel after displaying the "boot:" prompt.␊
94 */␊
95#define kBootErrorTimeout 5␊
96␊
97/*␊
98 * Default path to kernel cache file␊
99 */␊
100#define kDefaultCachePath "/System/Library/Caches/com.apple.kernelcaches/kernelcache"␊
101␊
102//==========================================================================␊
103// Zero the BSS.␊
104␊
105static void zeroBSS(void)␊
106{␊
107␉extern char _DATA__bss__begin, _DATA__bss__end;␊
108␉extern char _DATA__common__begin, _DATA__common__end;␊
109␊
110␉bzero(&_DATA__bss__begin, (&_DATA__bss__end - &_DATA__bss__begin));␊
111␉bzero(&_DATA__common__begin, (&_DATA__common__end - &_DATA__common__begin));␊
112}␊
113␊
114//==========================================================================␊
115// Malloc error function␊
116␊
117static void malloc_error(char *addr, size_t size, const char *file, int line)␊
118{␊
119␉stop("\nMemory allocation error! Addr=0x%x, Size=0x%x, File=%s, Line=%d\n", (unsigned)addr, (unsigned)size, file, line);␊
120}␊
121␊
122//==========================================================================␊
123//Initializes the runtime. Right now this means zeroing the BSS and initializing malloc.␊
124//␊
125void initialize_runtime(void)␊
126{␊
127␉zeroBSS();␊
128␉malloc_init(0, 0, 0, malloc_error);␊
129}␊
130␊
131//==========================================================================␊
132// execKernel - Load the kernel image (mach-o) and jump to its entry point.␊
133␊
134static int ExecKernel(void *binary)␊
135{␊
136 entry_t kernelEntry;␊
137 int ret;␊
138␊
139 bootArgs->kaddr = bootArgs->ksize = 0;␊
140␊
141 ret = DecodeKernel(binary,␊
142 &kernelEntry,␊
143 (char **) &bootArgs->kaddr,␊
144 (int *)&bootArgs->ksize );␊
145␊
146 if ( ret != 0 )␊
147 return ret;␊
148␊
149 // Reserve space for boot args␊
150 reserveKernBootStruct();␊
151␊
152 // Load boot drivers from the specifed root path.␊
153␊
154 if (!gHaveKernelCache) {␊
155 LoadDrivers("/");␊
156 }␊
157␊
158 clearActivityIndicator();␊
159␊
160 if (gErrors) {␊
161 printf("Errors encountered while starting up the computer.\n");␊
162 printf("Pausing %d seconds...\n", kBootErrorTimeout);␊
163 sleep(kBootErrorTimeout);␊
164 }␊
165␊
166␉md0Ramdisk();␊
167␉␊
168 setupFakeEfi();␊
169␊
170 verbose("Starting Darwin %s\n",( archCpuType == CPU_TYPE_I386 ) ? "x86" : "x86_64");␊
171␊
172 // Cleanup the PXE base code.␊
173␊
174 if ( (gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit ) {␊
175␉␉if ( (ret = nbpUnloadBaseCode()) != nbpStatusSuccess )␊
176 {␊
177 ␉printf("nbpUnloadBaseCode error %d\n", (int) ret);␊
178 sleep(2);␊
179 }␊
180 }␊
181␊
182 bool dummyVal;␊
183 if (getBoolForKey(kWaitForKeypressKey, &dummyVal, &bootInfo->bootConfig) && dummyVal) {␊
184␉printf("Press any key to continue...");␊
185␉getc();␊
186 }␊
187␊
188 // If we were in text mode, switch to graphics mode.␊
189 // This will draw the boot graphics unless we are in␊
190 // verbose mode.␊
191␊
192 if(gVerboseMode)␊
193 setVideoMode( GRAPHICS_MODE, 0 );␊
194 else␊
195 drawBootGraphics();␊
196␉␊
197 finalizeBootStruct();␊
198 ␊
199␉usb_loop();␊
200 // Jump to kernel's entry point. There's no going back now.␊
201 startprog( kernelEntry, bootArgs );␊
202␊
203 // Not reached␊
204␊
205 return 0;␊
206}␊
207␊
208//==========================================================================␊
209// This is the entrypoint from real-mode which functions exactly as it did␊
210// before. Multiboot does its own runtime initialization, does some of its␊
211// own things, and then calls common_boot.␊
212void boot(int biosdev)␊
213{␊
214␉initialize_runtime();␊
215␉// Enable A20 gate before accessing memory above 1Mb.␊
216␉enableA20();␊
217␉common_boot(biosdev);␊
218}␊
219␊
220//==========================================================================␊
221// The 'main' function for the booter. Called by boot0 when booting␊
222// from a block device, or by the network booter.␊
223//␊
224// arguments:␊
225// biosdev - Value passed from boot1/NBP to specify the device␊
226// that the booter was loaded from.␊
227//␊
228// If biosdev is kBIOSDevNetwork, then this function will return if␊
229// booting was unsuccessful. This allows the PXE firmware to try the␊
230// next boot device on its list.␊
231void common_boot(int biosdev)␊
232{␊
233 int status;␊
234 char *bootFile;␊
235 unsigned long adler32;␊
236 bool quiet;␊
237 bool firstRun = true;␊
238 bool instantMenu;␊
239 bool rescanPrompt;␊
240 unsigned int allowBVFlags = kBVFlagSystemVolume|kBVFlagForeignBoot;␊
241 unsigned int denyBVFlags = kBVFlagEFISystem;␊
242␊
243 // Set reminder to unload the PXE base code. Neglect to unload␊
244 // the base code will result in a hang or kernel panic.␊
245 gUnloadPXEOnExit = true;␊
246␊
247 // Record the device that the booter was loaded from.␊
248 gBIOSDev = biosdev & kBIOSDevMask;␊
249␊
250 // Initialize boot info structure.␊
251 initKernBootStruct();␊
252␊
253 // Setup VGA text mode.␊
254 // Not sure if it is safe to call setVideoMode() before the␊
255 // config table has been loaded. Call video_mode() instead.␊
256#if DEBUG␊
257 printf("before video_mode\n");␊
258#endif␊
259 video_mode( 2 ); // 80x25 mono text mode.␊
260#if DEBUG␊
261 printf("after video_mode\n");␊
262#endif␊
263␊
264 // Scan and record the system's hardware information.␊
265 scan_platform();␊
266␊
267 // First get info for boot volume.␊
268 scanBootVolumes(gBIOSDev, 0);␊
269 bvChain = getBVChainForBIOSDev(gBIOSDev);␊
270 setBootGlobals(bvChain);␊
271 ␊
272 // Load boot.plist config file␊
273 status = loadSystemConfig(&bootInfo->bootConfig);␊
274␊
275 if (getBoolForKey(kQuietBootKey, &quiet, &bootInfo->bootConfig) && quiet) {␊
276 gBootMode |= kBootModeQuiet;␊
277 }␊
278␊
279 // Override firstRun to get to the boot menu instantly by setting "Instant Menu"=y in system config␊
280 if (getBoolForKey(kInsantMenuKey, &instantMenu, &bootInfo->bootConfig) && instantMenu) {␊
281 firstRun = false;␊
282 }␊
283␊
284 // Loading preboot ramdisk if exists.␊
285 loadPrebootRAMDisk();␊
286␊
287 // Disable rescan option by default␊
288 gEnableCDROMRescan = false;␊
289␊
290 // Enable it with Rescan=y in system config␊
291 if (getBoolForKey(kRescanKey, &gEnableCDROMRescan, &bootInfo->bootConfig) && gEnableCDROMRescan) {␊
292 gEnableCDROMRescan = true;␊
293 }␊
294␊
295 // Ask the user for Rescan option by setting "Rescan Prompt"=y in system config.␊
296 rescanPrompt = false;␊
297 if (getBoolForKey(kRescanPromptKey, &rescanPrompt , &bootInfo->bootConfig) && rescanPrompt && biosDevIsCDROM(gBIOSDev)) {␊
298 gEnableCDROMRescan = promptForRescanOption();␊
299 }␊
300␊
301 // Enable touching a single BIOS device only if "Scan Single Drive"=y is set in system config.␊
302 if (getBoolForKey(kScanSingleDriveKey, &gScanSingleDrive, &bootInfo->bootConfig) && gScanSingleDrive) {␊
303 gScanSingleDrive = true;␊
304 }␊
305␊
306 // Create a list of partitions on device(s).␊
307 if (gScanSingleDrive) {␊
308 scanBootVolumes(gBIOSDev, &bvCount);␊
309 } else {␊
310 scanDisks(gBIOSDev, &bvCount);␊
311 }␊
312␊
313 // Create a separated bvr chain using the specified filters.␊
314 bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
315␊
316 gBootVolume = selectBootVolume(bvChain);␊
317␊
318#if DEBUG␊
319 printf(" Default: %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBootVolume, gBootVolume->biosdev, gBootVolume->part_no, gBootVolume->flags);␊
320 printf(" bt(0,0): %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBIOSBootVolume, gBIOSBootVolume->biosdev, gBIOSBootVolume->part_no, gBIOSBootVolume->flags);␊
321 getc();␊
322#endif␊
323␊
324 useGUI = true;␊
325 // Override useGUI default␊
326 getBoolForKey(kGUIKey, &useGUI, &bootInfo->bootConfig);␊
327 if (useGUI) {␊
328␉␉patchVideoBios();␊
329 /* XXX AsereBLN handle error */␊
330␉␉initGUI();␊
331 }␊
332␊
333 setBootGlobals(bvChain);␊
334␊
335 // Parse args, load and start kernel.␊
336 while (1) {␊
337 const char *val;␊
338 int len;␊
339 int trycache;␊
340 long flags, cachetime, kerneltime, exttime, sleeptime, time;␊
341 int ret = -1;␊
342 void *binary = (void *)kLoadAddr;␊
343 bool tryresume;␊
344 bool tryresumedefault;␊
345 bool forceresume;␊
346␊
347 config_file_t systemVersion;␉␉// system.plist of booting partition␊
348␊
349 // additional variable for testing alternate kernel image locations on boot helper partitions.␊
350 char bootFileSpec[512];␊
351␉␉␊
352 // Initialize globals.␊
353␊
354 sysConfigValid = false;␊
355 gErrors = false;␊
356␊
357 status = getBootOptions(firstRun);␊
358 firstRun = false;␊
359 if (status == -1) continue;␊
360␉␉ ␊
361 status = processBootOptions();␊
362 // Status==1 means to chainboot␊
363 if ( status == 1 ) break;␊
364 // Status==-1 means that the config file couldn't be loaded or that gBootVolume is NULL␊
365 if ( status == -1 )␊
366 {␊
367 // gBootVolume == NULL usually means the user hit escape.␊
368 if(gBootVolume == NULL)␊
369 {␊
370 freeFilteredBVChain(bvChain);␊
371␊
372 if (gEnableCDROMRescan)␊
373 rescanBIOSDevice(gBIOSDev);␊
374 ␊
375 bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
376 setBootGlobals(bvChain);␊
377 }␊
378 continue;␊
379 }␊
380␉␉␊
381 // Other status (e.g. 0) means that we should proceed with boot.␊
382␉␉␊
383␉␉if( bootArgs->Video.v_display == GRAPHICS_MODE )␊
384␉␉␉drawBackground();␊
385␉␉␉␊
386 // Found and loaded a config file. Proceed with boot.␊
387␊
388␉␉// Turn off any GUI elements␊
389␉␉if( bootArgs->Video.v_display == GRAPHICS_MODE )␊
390␉␉{␊
391␉␉␉gui.devicelist.draw = false;␊
392␉␉␉gui.bootprompt.draw = false;␊
393␉␉␉gui.menu.draw = false;␊
394␉␉␉gui.infobox.draw = false;␊
395␉␉␉drawBackground();␊
396␉␉␉updateVRAM();␊
397␉␉}␊
398␉␉␊
399␉␉// Find out which version mac os we're booting.␊
400␉␉if (!loadConfigFile("System/Library/CoreServices/SystemVersion.plist", &systemVersion)) {␊
401␉␉␉if (getValueForKey(kProductVersion, &val, &len, &systemVersion)) {␉␊
402␉␉␉␉// getValueForKey uses const char for val␊
403␉␉␉␉// so copy it and trim␊
404␉␉␉␉strncpy(gMacOSVersion, val, MIN(len, 4));␊
405␉␉␉␉gMacOSVersion[MIN(len, 4)] = '\0';␊
406␉␉␉}␊
407␉␉}␊
408␊
409␉␉if (platformCPUFeature(CPU_FEATURE_EM64T)) {␊
410␉␉␉archCpuType = CPU_TYPE_X86_64;␊
411␉␉} else {␊
412␉␉␉archCpuType = CPU_TYPE_I386;␊
413␉␉}␊
414␉␉if (getValueForKey(karch, &val, &len, &bootInfo->bootConfig)) {␊
415␉␉␉if (strncmp(val, "i386", 4) == 0) {␊
416␉␉␉␉archCpuType = CPU_TYPE_I386;␊
417␉␉␉}␊
418␉␉}␊
419␉␉if (getValueForKey(k32BitModeFlag, &val, &len, &bootInfo->bootConfig)) {␊
420␉␉␉archCpuType = CPU_TYPE_I386;␊
421␉␉}␊
422␉␉␊
423␉␉if (!getBoolForKey (kWake, &tryresume, &bootInfo->bootConfig)) {␊
424␉␉␉tryresume = true;␊
425␉␉␉tryresumedefault = true;␊
426␉␉} else {␊
427␉␉␉tryresumedefault = false;␊
428␉␉}␊
429␊
430␉␉if (!getBoolForKey (kForceWake, &forceresume, &bootInfo->bootConfig)) {␊
431␉␉␉forceresume = false;␊
432␉␉}␊
433␉␉␊
434␉␉if (forceresume) {␊
435␉␉␉tryresume = true;␊
436␉␉␉tryresumedefault = false;␊
437␉␉}␊
438␉␉␊
439␉␉while (tryresume) {␊
440␉␉␉const char *tmp;␊
441␉␉␉BVRef bvr;␊
442␉␉␉if (!getValueForKey(kWakeImage, &val, &len, &bootInfo->bootConfig))␊
443␉␉␉␉val="/private/var/vm/sleepimage";␊
444␉␉␉␊
445␉␉␉// Do this first to be sure that root volume is mounted␊
446␉␉␉ret = GetFileInfo(0, val, &flags, &sleeptime);␊
447␊
448␉␉␉if ((bvr = getBootVolumeRef(val, &tmp)) == NULL)␊
449␉␉␉␉break;␊
450␉␉␉␊
451␉␉␉// Can't check if it was hibernation Wake=y is required␊
452␉␉␉if (bvr->modTime == 0 && tryresumedefault)␊
453␉␉␉␉break;␊
454␉␉␉␊
455␉␉␉if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat))␊
456␉␉␉␉break;␊
457␉␉␉␊
458␉␉␉if (!forceresume && ((sleeptime+3)<bvr->modTime)) {␊
459␉␉␉␉printf ("Hibernate image is too old by %d seconds. Use ForceWake=y to override\n",bvr->modTime-sleeptime);␊
460␉␉␉␉break;␊
461␉␉␉}␊
462␉␉␉␉␊
463␉␉␉HibernateBoot((char *)val);␊
464␉␉␉break;␊
465␉␉}␊
466␊
467 // Reset cache name.␊
468 bzero(gCacheNameAdler + 64, sizeof(gCacheNameAdler) - 64);␊
469␊
470 sprintf(gCacheNameAdler + 64, "%s,%s", gRootDevice, bootInfo->bootFile);␊
471␊
472 adler32 = Adler32((unsigned char *)gCacheNameAdler, sizeof(gCacheNameAdler));␊
473␊
474 if (getValueForKey(kKernelCacheKey, &val, &len, &bootInfo->bootConfig)) {␊
475 strlcpy(gBootKernelCacheFile, val, len+1);␊
476 } else {␊
477 sprintf(gBootKernelCacheFile, "%s.%08lX", kDefaultCachePath, adler32);␊
478 }␊
479␊
480 // Check for cache file.␊
481 trycache = (((gBootMode & kBootModeSafe) == 0) &&␊
482 !gOverrideKernel &&␊
483 (gBootFileType == kBlockDeviceType) &&␊
484 (gMKextName[0] == '\0') &&␊
485 (gBootKernelCacheFile[0] != '\0'));␊
486␊
487␉␉verbose("Loading Darwin %s\n", gMacOSVersion);␊
488␉␉␊
489 if (trycache) do {␊
490 ␊
491 // if we haven't found the kernel yet, don't use the cache␊
492 ret = GetFileInfo(NULL, bootInfo->bootFile, &flags, &kerneltime);␊
493 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)) {␊
494 trycache = 0;␊
495 break;␊
496 }␊
497 ret = GetFileInfo(NULL, gBootKernelCacheFile, &flags, &cachetime);␊
498 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)␊
499 || (cachetime < kerneltime)) {␊
500 trycache = 0;␊
501 break;␊
502 }␊
503 ret = GetFileInfo("/System/Library/", "Extensions", &flags, &exttime);␊
504 if ((ret == 0) && ((flags & kFileTypeMask) == kFileTypeDirectory)␊
505 && (cachetime < exttime)) {␊
506 trycache = 0;␊
507 break;␊
508 }␊
509 if (kerneltime > exttime) {␊
510 exttime = kerneltime;␊
511 }␊
512 if (cachetime != (exttime + 1)) {␊
513 trycache = 0;␊
514 break;␊
515 }␊
516 } while (0);␊
517␊
518 do {␊
519 if (trycache) {␊
520 bootFile = gBootKernelCacheFile;␊
521 verbose("Loading kernel cache %s\n", bootFile);␊
522 ret = LoadFile(bootFile);␊
523 binary = (void *)kLoadAddr;␊
524 if (ret >= 0) {␊
525 break;␊
526 }␊
527 }␊
528 bootFile = bootInfo->bootFile;␊
529␊
530 // Try to load kernel image from alternate locations on boot helper partitions.␊
531 sprintf(bootFileSpec, "com.apple.boot.P/%s", bootFile);␊
532 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
533 ␉ ␉ if (ret == -1)␊
534 ␉ ␉ {␊
535 sprintf(bootFileSpec, "com.apple.boot.R/%s", bootFile);␊
536 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
537 if (ret == -1)␊
538 {␊
539 sprintf(bootFileSpec, "com.apple.boot.S/%s", bootFile);␊
540 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
541 if (ret == -1)␊
542 {␊
543 // Not found any alternate locations, using the original kernel image path.␊
544 strcpy(bootFileSpec, bootFile);␊
545 }␊
546 }␊
547 }␊
548 ␉␉␉␊
549 verbose("Loading kernel %s\n", bootFileSpec);␊
550 ret = LoadThinFatFile(bootFileSpec, &binary);␊
551 if (ret <= 0 && archCpuType == CPU_TYPE_X86_64)␊
552 {␊
553 archCpuType = CPU_TYPE_I386;␊
554 ret = LoadThinFatFile(bootFileSpec, &binary);␉␉␉␉␊
555 }␊
556␉␉␉␊
557 } while (0);␊
558␊
559 clearActivityIndicator();␊
560#if DEBUG␊
561 printf("Pausing...");␊
562 sleep(8);␊
563#endif␊
564␊
565 if (ret <= 0) {␊
566␉␉␉printf("Can't find %s\n", bootFile);␊
567␊
568␉␉␉if(gui.initialised) {␊
569␉␉␉␉sleep(1);␊
570␉␉␉␉drawBackground();␊
571␉␉␉␉gui.devicelist.draw = true;␊
572␉␉␉␉gui.redraw = true;␊
573␉␉␉}␊
574 if (gBootFileType == kNetworkDeviceType) {␊
575 // Return control back to PXE. Don't unload PXE base code.␊
576 gUnloadPXEOnExit = false;␊
577 break;␊
578 }␊
579 } else {␊
580 /* Won't return if successful. */␊
581 ret = ExecKernel(binary);␊
582 }␊
583 }␊
584 ␊
585 // chainboot␊
586 if (status==1) {␊
587␉if (getVideoMode() == GRAPHICS_MODE) {␉// if we are already in graphics-mode,␊
588␉␉setVideoMode(VGA_TEXT_MODE, 0);␉// switch back to text mode␊
589␉}␊
590 }␊
591␉␊
592 if ((gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit) {␊
593␉nbpUnloadBaseCode();␊
594 }␊
595}␊
596␊
597/*!␊
598 Selects a new BIOS device, taking care to update the global state appropriately.␊
599 */␊
600/*␊
601static void selectBiosDevice(void)␊
602{␊
603 struct DiskBVMap *oldMap = diskResetBootVolumes(gBIOSDev);␊
604 CacheReset();␊
605 diskFreeMap(oldMap);␊
606 oldMap = NULL;␊
607␊
608 int dev = selectAlternateBootDevice(gBIOSDev);␊
609␊
610 BVRef bvchain = scanBootVolumes(dev, 0);␊
611 BVRef bootVol = selectBootVolume(bvchain);␊
612 gBootVolume = bootVol;␊
613 setRootVolume(bootVol);␊
614 gBIOSDev = dev;␊
615}␊
616*/␊
617␊
618#define BASE 65521L /* largest prime smaller than 65536 */␊
619#define NMAX 5000␊
620// NMAX (was 5521) the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1␊
621␊
622#define DO1(buf,i) {s1 += buf[i]; s2 += s1;}␊
623#define DO2(buf,i) DO1(buf,i); DO1(buf,i+1);␊
624#define DO4(buf,i) DO2(buf,i); DO2(buf,i+2);␊
625#define DO8(buf,i) DO4(buf,i); DO4(buf,i+4);␊
626#define DO16(buf) DO8(buf,0); DO8(buf,8);␊
627␊
628unsigned long Adler32(unsigned char *buf, long len)␊
629{␊
630 unsigned long s1 = 1; // adler & 0xffff;␊
631 unsigned long s2 = 0; // (adler >> 16) & 0xffff;␊
632 unsigned long result;␊
633 int k;␊
634␊
635 while (len > 0) {␊
636 k = len < NMAX ? len : NMAX;␊
637 len -= k;␊
638 while (k >= 16) {␊
639 DO16(buf);␊
640 buf += 16;␊
641 k -= 16;␊
642 }␊
643 if (k != 0) do {␊
644 s1 += *buf++;␊
645 s2 += s1;␊
646 } while (--k);␊
647 s1 %= BASE;␊
648 s2 %= BASE;␊
649 }␊
650 result = (s2 << 16) | s1;␊
651 return OSSwapHostToBigInt32(result);␊
652}␊
653

Archive Download this file

Revision: 251