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

Source at commit 130 created 14 years 1 month ago.
By diebuche, added changes by azimutz. our versions should now be nearly equal. (excluding the ramdisk changes..)
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 "edid.h"␊
62#include "915resolution.h"␊
63␊
64long gBootMode; /* defaults to 0 == kBootModeNormal */␊
65bool gOverrideKernel;␊
66static char gBootKernelCacheFile[512];␊
67static char gCacheNameAdler[64 + 256];␊
68char *gPlatformName = gCacheNameAdler;␊
69char gRootDevice[512];␊
70char gMKextName[512];␊
71char gMacOSVersion[8];␊
72bool gEnableCDROMRescan;␊
73bool gScanSingleDrive;␊
74␊
75int bvCount = 0;␊
76//int␉␉menucount = 0;␊
77int gDeviceCount = 0; ␊
78␊
79BVRef bvr;␊
80BVRef menuBVR;␊
81BVRef bvChain;␊
82bool useGUI;␊
83bool autoResolution;␊
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, vbios_map *map)␊
135{␊
136 entry_t kernelEntry;␊
137 int ret;␊
138␉␊
139␉UInt32 params[4];␊
140␉int count;␊
141␉params[3] = 0;␊
142␊
143 bootArgs->kaddr = bootArgs->ksize = 0;␊
144␊
145 ret = DecodeKernel(binary,␊
146 &kernelEntry,␊
147 (char **) &bootArgs->kaddr,␊
148 (int *)&bootArgs->ksize );␊
149␊
150 if ( ret != 0 )␊
151 return ret;␊
152␊
153 // Reserve space for boot args␊
154 reserveKernBootStruct();␊
155␊
156 // Load boot drivers from the specifed root path.␊
157␊
158 if (!gHaveKernelCache) {␊
159 LoadDrivers("/");␊
160 }␊
161␊
162 clearActivityIndicator();␊
163␊
164 if (gErrors) {␊
165 printf("Errors encountered while starting up the computer.\n");␊
166 printf("Pausing %d seconds...\n", kBootErrorTimeout);␊
167 sleep(kBootErrorTimeout);␊
168 }␉␉␊
169␉␊
170␉//if the vbios patch have been applied restore it before performing fake efi stuff␊
171␉if (autoResolution == TRUE) {␊
172␉␉unlock_vbios(map);␊
173␉␉restore_vbios(map);␊
174␉␉relock_vbios(map);␊
175␉}␉␊
176␊
177 setupFakeEfi();␊
178␉␊
179␉//Reapply the vbios patch before setting mode for boot graphics␊
180␉if (autoResolution == TRUE) {␊
181␉␉count = getNumberArrayFromProperty(kGraphicsModeKey, params, 4);␊
182␉␉if ( count < 3 ) {␊
183␉␉␉getResolution(&params[0], &params[1], &params[2]);␊
184␉␉}␊
185␉␉else ␊
186␉␉{␊
187␉␉␉if ( params[2] == 256 ) params[2] = 8;␊
188␉␉␉if ( params[2] == 555 ) params[2] = 16;␊
189␉␉␉if ( params[2] == 888 ) params[2] = 32;␊
190␉␉}␊
191␉␉␊
192␉␉if (params[0]!=0 && params[1]!=0) {␊
193␉␉␉␊
194␉␉␉unlock_vbios(map);␊
195␉␉␉␊
196␉␉␉set_mode(map, params[0], params[1], params[2], 0, 0);␊
197␉␉␉␊
198␉␉␉relock_vbios(map);␊
199␉␉}␊
200␉}␊
201␊
202 verbose("Starting Darwin %s\n",( archCpuType == CPU_TYPE_I386 ) ? "x86" : "x86_64");␊
203␊
204 // Cleanup the PXE base code.␊
205␊
206 if ( (gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit ) {␊
207␉␉if ( (ret = nbpUnloadBaseCode()) != nbpStatusSuccess )␊
208 {␊
209 ␉printf("nbpUnloadBaseCode error %d\n", (int) ret);␊
210 sleep(2);␊
211 }␊
212 }␊
213␊
214 bool dummyVal;␊
215 if (getBoolForKey(kWaitForKeypressKey, &dummyVal, &bootInfo->bootConfig) && dummyVal) {␊
216␉printf("Press any key to continue...");␊
217␉getc();␊
218 }␊
219␊
220 // If we were in text mode, switch to graphics mode.␊
221 // This will draw the boot graphics unless we are in␊
222 // verbose mode.␊
223␊
224 if(gVerboseMode)␊
225 setVideoMode( GRAPHICS_MODE, 0 );␊
226 else␊
227 drawBootGraphics();␊
228␉␊
229␉//Boot Graphis are set finalize and free vbios patch structures␊
230␉if (autoResolution == TRUE) {␊
231␉␉unlock_vbios(map);␊
232␉␉restore_vbios(map);␊
233␉␉relock_vbios(map);␊
234␉␉close_vbios(map);␊
235␉}␊
236␉␊
237 finalizeBootStruct();␊
238 ␊
239 // Jump to kernel's entry point. There's no going back now.␊
240␊
241 startprog( kernelEntry, bootArgs );␊
242␊
243 // Not reached␊
244␊
245 return 0;␊
246}␊
247␊
248//==========================================================================␊
249// This is the entrypoint from real-mode which functions exactly as it did␊
250// before. Multiboot does its own runtime initialization, does some of its␊
251// own things, and then calls common_boot.␊
252void boot(int biosdev)␊
253{␊
254␉initialize_runtime();␊
255␉// Enable A20 gate before accessing memory above 1Mb.␊
256␉enableA20();␊
257␉common_boot(biosdev);␊
258}␊
259␊
260//==========================================================================␊
261// The 'main' function for the booter. Called by boot0 when booting␊
262// from a block device, or by the network booter.␊
263//␊
264// arguments:␊
265// biosdev - Value passed from boot1/NBP to specify the device␊
266// that the booter was loaded from.␊
267//␊
268// If biosdev is kBIOSDevNetwork, then this function will return if␊
269// booting was unsuccessful. This allows the PXE firmware to try the␊
270// next boot device on its list.␊
271void common_boot(int biosdev)␊
272{␊
273 int status;␊
274 char *bootFile;␊
275 unsigned long adler32;␊
276 bool quiet;␊
277 bool firstRun = true;␊
278 bool instantMenu;␊
279 bool rescanPrompt;␊
280 unsigned int allowBVFlags = kBVFlagSystemVolume|kBVFlagForeignBoot;␊
281 unsigned int denyBVFlags = kBVFlagEFISystem;␊
282␊
283 // Set reminder to unload the PXE base code. Neglect to unload␊
284 // the base code will result in a hang or kernel panic.␊
285 gUnloadPXEOnExit = true;␊
286␊
287 // Record the device that the booter was loaded from.␊
288 gBIOSDev = biosdev & kBIOSDevMask;␊
289␊
290 // Initialize boot info structure.␊
291 initKernBootStruct();␊
292␊
293 // Setup VGA text mode.␊
294 // Not sure if it is safe to call setVideoMode() before the␊
295 // config table has been loaded. Call video_mode() instead.␊
296#if DEBUG␊
297 printf("before video_mode\n");␊
298#endif␊
299 video_mode( 2 ); // 80x25 mono text mode.␊
300#if DEBUG␊
301 printf("after video_mode\n");␊
302#endif␊
303␊
304 // Scan and record the system's hardware information.␊
305 scan_platform();␊
306␊
307 // First get info for boot volume.␊
308 scanBootVolumes(gBIOSDev, 0);␊
309 bvChain = getBVChainForBIOSDev(gBIOSDev);␊
310 setBootGlobals(bvChain);␊
311 ␊
312 // Load boot.plist config file␊
313 status = loadSystemConfig(&bootInfo->bootConfig);␊
314␊
315 if (getBoolForKey(kQuietBootKey, &quiet, &bootInfo->bootConfig) && quiet) {␊
316 gBootMode |= kBootModeQuiet;␊
317 }␊
318␊
319 // Override firstRun to get to the boot menu instantly by setting "Instant Menu"=y in system config␊
320 if (getBoolForKey(kInsantMenuKey, &instantMenu, &bootInfo->bootConfig) && instantMenu) {␊
321 firstRun = false;␊
322 }␊
323␊
324 // Loading preboot ramdisk if exists.␊
325 loadPrebootRAMDisk();␊
326␊
327 // Disable rescan option by default␊
328 gEnableCDROMRescan = false;␊
329␊
330 // Enable it with Rescan=y in system config␊
331 if (getBoolForKey(kRescanKey, &gEnableCDROMRescan, &bootInfo->bootConfig) && gEnableCDROMRescan) {␊
332 gEnableCDROMRescan = true;␊
333 }␊
334␊
335 // Ask the user for Rescan option by setting "Rescan Prompt"=y in system config.␊
336 rescanPrompt = false;␊
337 if (getBoolForKey(kRescanPromptKey, &rescanPrompt , &bootInfo->bootConfig) && rescanPrompt && biosDevIsCDROM(gBIOSDev)) {␊
338 gEnableCDROMRescan = promptForRescanOption();␊
339 }␊
340␊
341 // Enable touching a single BIOS device only if "Scan Single Drive"=y is set in system config.␊
342 if (getBoolForKey(kScanSingleDriveKey, &gScanSingleDrive, &bootInfo->bootConfig) && gScanSingleDrive) {␊
343 gScanSingleDrive = true;␊
344 }␊
345␊
346 // Create a list of partitions on device(s).␊
347 if (gScanSingleDrive) {␊
348 scanBootVolumes(gBIOSDev, &bvCount);␊
349 } else {␊
350 scanDisks(gBIOSDev, &bvCount);␊
351 }␊
352␊
353 // Create a separated bvr chain using the specified filters.␊
354 bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
355␊
356 gBootVolume = selectBootVolume(bvChain);␊
357␊
358#if DEBUG␊
359 printf(" Default: %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBootVolume, gBootVolume->biosdev, gBootVolume->part_no, gBootVolume->flags);␊
360 printf(" bt(0,0): %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n", gBIOSBootVolume, gBIOSBootVolume->biosdev, gBIOSBootVolume->part_no, gBIOSBootVolume->flags);␊
361 getc();␊
362#endif␊
363␊
364␉␊
365␉useGUI = TRUE;␊
366␉// Override useGUI default␊
367␉getBoolForKey(kGUIKey, &useGUI, &bootInfo->bootConfig);␊
368 ␉␊
369 ␉// Before initGui, patch the video bios with the correct resolution␊
370 ␉␊
371 ␉UInt32 params[4];␊
372 ␉int count;␊
373 ␉params[3] = 0;␊
374 ␉vbios_map * map = open_vbios(CT_UNKWN);␊
375␉␊
376 ␉autoResolution = TRUE;␊
377 ␉// Override AutoResolution default␊
378 ␉getBoolForKey(kAutoResolutionKey, &autoResolution, &bootInfo->bootConfig);␊
379 ␉␊
380 ␉if (autoResolution == TRUE) {␊
381 ␉␉count = getNumberArrayFromProperty(kGraphicsModeKey, params, 4);␊
382 ␉␉if ( count < 3 )␊
383 ␉␉␉getResolution(&params[0], &params[1], &params[2]);␊
384 ␉␉else ␊
385 ␉␉{␊
386 ␉␉␉if ( params[2] == 256 ) params[2] = 8;␊
387 ␉␉␉if ( params[2] == 555 ) params[2] = 16;␊
388 ␉␉␉if ( params[2] == 888 ) params[2] = 32;␊
389 ␉␉}␊
390 ␉␉␊
391 ␉␉if (params[0]!=0 && params[1]!=0) {␉␊
392 ␉␉␉vbios_map * map = open_vbios(CT_UNKWN);␊
393 ␉␉␉␊
394 ␉␉␉unlock_vbios(map);␊
395 ␉␉␉␊
396 ␉␉␉save_vbios(map);␊
397 ␉␉␉␊
398 ␉␉␉set_mode(map, params[0], params[1], params[2], 0, 0);␊
399 ␉␉␉␊
400 ␉␉␉relock_vbios(map);␊
401 ␉␉␉␊
402 ␉␉␉verbose("Patched resolution mode to %dx%d.\n", params[0], params[1]);␊
403 ␉␉}␊
404 ␉}␊
405␉␉␊
406 if (useGUI) {␊
407 /* XXX AsereBLN handle error */␊
408␉initGUI();␊
409 }␊
410␊
411 setBootGlobals(bvChain);␊
412␊
413 // Parse args, load and start kernel.␊
414 while (1) {␊
415 const char *val;␊
416 int len;␊
417 int trycache;␊
418 long flags, cachetime, kerneltime, exttime, sleeptime, time;␊
419 int ret = -1;␊
420 void *binary = (void *)kLoadAddr;␊
421 bool tryresume;␊
422 bool tryresumedefault;␊
423 bool forceresume;␊
424␊
425 config_file_t systemVersion;␉␉// system.plist of booting partition␊
426␊
427 // additional variable for testing alternate kernel image locations on boot helper partitions.␊
428 char bootFileSpec[512];␊
429␉␉␊
430 // Initialize globals.␊
431␊
432 sysConfigValid = false;␊
433 gErrors = false;␊
434␊
435 status = getBootOptions(firstRun);␊
436 firstRun = false;␊
437 if (status == -1) continue;␊
438␉␉ ␊
439 status = processBootOptions();␊
440 // Status==1 means to chainboot␊
441 if ( status == 1 ) break;␊
442 // Status==-1 means that the config file couldn't be loaded or that gBootVolume is NULL␊
443 if ( status == -1 )␊
444 {␊
445 // gBootVolume == NULL usually means the user hit escape.␊
446 if(gBootVolume == NULL)␊
447 {␊
448 freeFilteredBVChain(bvChain);␊
449␊
450 if (gEnableCDROMRescan)␊
451 rescanBIOSDevice(gBIOSDev);␊
452 ␊
453 bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊
454 setBootGlobals(bvChain);␊
455 }␊
456 continue;␊
457 }␊
458␉␉␊
459 // Other status (e.g. 0) means that we should proceed with boot.␊
460␉␉␊
461␉␉if( bootArgs->Video.v_display == GRAPHICS_MODE )␊
462␉␉␉drawBackground();␊
463␉␉␉␊
464 // Found and loaded a config file. Proceed with boot.␊
465␊
466␉␉// Turn off any GUI elements␊
467␉␉if( bootArgs->Video.v_display == GRAPHICS_MODE )␊
468␉␉{␊
469␉␉␉gui.devicelist.draw = false;␊
470␉␉␉gui.bootprompt.draw = false;␊
471␉␉␉gui.menu.draw = false;␊
472␉␉␉gui.infobox.draw = false;␊
473␉␉␉drawBackground();␊
474␉␉␉updateVRAM();␊
475␉␉}␊
476␉␉␊
477␉␉// Find out which version mac os we're booting.␊
478␉␉if (!loadConfigFile("System/Library/CoreServices/SystemVersion.plist", &systemVersion)) {␊
479␉␉␉if (getValueForKey(kProductVersion, &val, &len, &systemVersion)) {␉␊
480␉␉␉␉// getValueForKey uses const char for val␊
481␉␉␉␉// so copy it and trim␊
482␉␉␉␉strncpy(gMacOSVersion, val, MIN(len, 4));␊
483␉␉␉␉gMacOSVersion[MIN(len, 4)] = '\0';␊
484␉␉␉}␊
485␉␉}␊
486␊
487␉␉if (platformCPUFeature(CPU_FEATURE_EM64T)) {␊
488␉␉␉archCpuType = CPU_TYPE_X86_64;␊
489␉␉} else {␊
490␉␉␉archCpuType = CPU_TYPE_I386;␊
491␉␉}␊
492␉␉if (getValueForKey(karch, &val, &len, &bootInfo->bootConfig)) {␊
493␉␉␉if (strncmp(val, "i386", 4) == 0) {␊
494␉␉␉␉archCpuType = CPU_TYPE_I386;␊
495␉␉␉}␊
496␉␉}␊
497␉␉if (getValueForKey(k32BitModeFlag, &val, &len, &bootInfo->bootConfig)) {␊
498␉␉␉archCpuType = CPU_TYPE_I386;␊
499␉␉}␊
500␉␉␊
501␉␉if (!getBoolForKey (kWake, &tryresume, &bootInfo->bootConfig)) {␊
502␉␉␉tryresume = true;␊
503␉␉␉tryresumedefault = true;␊
504␉␉} else {␊
505␉␉␉tryresumedefault = false;␊
506␉␉}␊
507␊
508␉␉if (!getBoolForKey (kForceWake, &forceresume, &bootInfo->bootConfig)) {␊
509␉␉␉forceresume = false;␊
510␉␉}␊
511␉␉␊
512␉␉if (forceresume) {␊
513␉␉␉tryresume = true;␊
514␉␉␉tryresumedefault = false;␊
515␉␉}␊
516␉␉␊
517␉␉while (tryresume) {␊
518␉␉␉const char *tmp;␊
519␉␉␉BVRef bvr;␊
520␉␉␉if (!getValueForKey(kWakeImage, &val, &len, &bootInfo->bootConfig))␊
521␉␉␉␉val="/private/var/vm/sleepimage";␊
522␉␉␉␊
523␉␉␉// Do this first to be sure that root volume is mounted␊
524␉␉␉ret = GetFileInfo(0, val, &flags, &sleeptime);␊
525␊
526␉␉␉if ((bvr = getBootVolumeRef(val, &tmp)) == NULL)␊
527␉␉␉␉break;␊
528␉␉␉␊
529␉␉␉// Can't check if it was hibernation Wake=y is required␊
530␉␉␉if (bvr->modTime == 0 && tryresumedefault)␊
531␉␉␉␉break;␊
532␉␉␉␊
533␉␉␉if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat))␊
534␉␉␉␉break;␊
535␉␉␉␊
536␉␉␉if (!forceresume && ((sleeptime+3)<bvr->modTime)) {␊
537␉␉␉␉printf ("Hibernate image is too old by %d seconds. Use ForceWake=y to override\n",bvr->modTime-sleeptime);␊
538␉␉␉␉break;␊
539␉␉␉}␊
540␉␉␉␉␊
541␉␉␉HibernateBoot((char *)val);␊
542␉␉␉break;␊
543␉␉}␊
544␊
545 // Reset cache name.␊
546 bzero(gCacheNameAdler + 64, sizeof(gCacheNameAdler) - 64);␊
547␊
548 sprintf(gCacheNameAdler + 64, "%s,%s", gRootDevice, bootInfo->bootFile);␊
549␊
550 adler32 = Adler32((unsigned char *)gCacheNameAdler, sizeof(gCacheNameAdler));␊
551␊
552 if (getValueForKey(kKernelCacheKey, &val, &len, &bootInfo->bootConfig)) {␊
553 strlcpy(gBootKernelCacheFile, val, len+1);␊
554 } else {␊
555 sprintf(gBootKernelCacheFile, "%s.%08lX", kDefaultCachePath, adler32);␊
556 }␊
557␊
558 // Check for cache file.␊
559 trycache = (((gBootMode & kBootModeSafe) == 0) &&␊
560 !gOverrideKernel &&␊
561 (gBootFileType == kBlockDeviceType) &&␊
562 (gMKextName[0] == '\0') &&␊
563 (gBootKernelCacheFile[0] != '\0'));␊
564␊
565␉␉verbose("Loading Darwin %s\n", gMacOSVersion);␊
566␉␉␊
567 if (trycache) do {␊
568 ␊
569 // if we haven't found the kernel yet, don't use the cache␊
570 ret = GetFileInfo(NULL, bootInfo->bootFile, &flags, &kerneltime);␊
571 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)) {␊
572 trycache = 0;␊
573 break;␊
574 }␊
575 ret = GetFileInfo(NULL, gBootKernelCacheFile, &flags, &cachetime);␊
576 if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)␊
577 || (cachetime < kerneltime)) {␊
578 trycache = 0;␊
579 break;␊
580 }␊
581 ret = GetFileInfo("/System/Library/", "Extensions", &flags, &exttime);␊
582 if ((ret == 0) && ((flags & kFileTypeMask) == kFileTypeDirectory)␊
583 && (cachetime < exttime)) {␊
584 trycache = 0;␊
585 break;␊
586 }␊
587 if (kerneltime > exttime) {␊
588 exttime = kerneltime;␊
589 }␊
590 if (cachetime != (exttime + 1)) {␊
591 trycache = 0;␊
592 break;␊
593 }␊
594 } while (0);␊
595␊
596 do {␊
597 if (trycache) {␊
598 bootFile = gBootKernelCacheFile;␊
599 verbose("Loading kernel cache %s\n", bootFile);␊
600 ret = LoadFile(bootFile);␊
601 binary = (void *)kLoadAddr;␊
602 if (ret >= 0) {␊
603 break;␊
604 }␊
605 }␊
606 bootFile = bootInfo->bootFile;␊
607␊
608 // Try to load kernel image from alternate locations on boot helper partitions.␊
609 sprintf(bootFileSpec, "com.apple.boot.P/%s", bootFile);␊
610 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
611 ␉ ␉ if (ret == -1)␊
612 ␉ ␉ {␊
613 sprintf(bootFileSpec, "com.apple.boot.R/%s", bootFile);␊
614 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
615 if (ret == -1)␊
616 {␊
617 sprintf(bootFileSpec, "com.apple.boot.S/%s", bootFile);␊
618 ret = GetFileInfo(NULL, bootFileSpec, &flags, &time); ␊
619 if (ret == -1)␊
620 {␊
621 // Not found any alternate locations, using the original kernel image path.␊
622 strcpy(bootFileSpec, bootFile);␊
623 }␊
624 }␊
625 }␊
626 ␉␉␉␊
627 verbose("Loading kernel %s\n", bootFileSpec);␊
628 ret = LoadThinFatFile(bootFileSpec, &binary);␊
629 if (ret <= 0 && archCpuType == CPU_TYPE_X86_64)␊
630 {␊
631 archCpuType = CPU_TYPE_I386;␊
632 ret = LoadThinFatFile(bootFileSpec, &binary);␉␉␉␉␊
633 }␊
634␉␉␉␊
635 } while (0);␊
636␊
637 clearActivityIndicator();␊
638#if DEBUG␊
639 printf("Pausing...");␊
640 sleep(8);␊
641#endif␊
642␊
643 if (ret <= 0) {␊
644␉␉␉printf("Can't find %s\n", bootFile);␊
645␊
646␉␉␉if(gui.initialised) {␊
647␉␉␉␉sleep(1);␊
648␉␉␉␉drawBackground();␊
649␉␉␉␉gui.devicelist.draw = true;␊
650␉␉␉␉gui.redraw = true;␊
651␉␉␉}␊
652 if (gBootFileType == kNetworkDeviceType) {␊
653 // Return control back to PXE. Don't unload PXE base code.␊
654 gUnloadPXEOnExit = false;␊
655 break;␊
656 }␊
657 } else {␊
658 /* Won't return if successful. */␊
659 ret = ExecKernel(binary, map);␊
660 }␊
661 }␊
662 ␊
663 // chainboot␊
664 if (status==1) {␊
665␉if (getVideoMode() == GRAPHICS_MODE) {␉// if we are already in graphics-mode,␊
666␉␉setVideoMode(VGA_TEXT_MODE, 0);␉// switch back to text mode␊
667␉}␊
668 }␊
669␉␊
670 if ((gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit) {␊
671␉nbpUnloadBaseCode();␊
672 }␊
673}␊
674␊
675/*!␊
676 Selects a new BIOS device, taking care to update the global state appropriately.␊
677 */␊
678/*␊
679static void selectBiosDevice(void)␊
680{␊
681 struct DiskBVMap *oldMap = diskResetBootVolumes(gBIOSDev);␊
682 CacheReset();␊
683 diskFreeMap(oldMap);␊
684 oldMap = NULL;␊
685␊
686 int dev = selectAlternateBootDevice(gBIOSDev);␊
687␊
688 BVRef bvchain = scanBootVolumes(dev, 0);␊
689 BVRef bootVol = selectBootVolume(bvchain);␊
690 gBootVolume = bootVol;␊
691 setRootVolume(bootVol);␊
692 gBIOSDev = dev;␊
693}␊
694*/␊
695␊
696#define BASE 65521L /* largest prime smaller than 65536 */␊
697#define NMAX 5000␊
698// NMAX (was 5521) the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1␊
699␊
700#define DO1(buf,i) {s1 += buf[i]; s2 += s1;}␊
701#define DO2(buf,i) DO1(buf,i); DO1(buf,i+1);␊
702#define DO4(buf,i) DO2(buf,i); DO2(buf,i+2);␊
703#define DO8(buf,i) DO4(buf,i); DO4(buf,i+4);␊
704#define DO16(buf) DO8(buf,0); DO8(buf,8);␊
705␊
706unsigned long Adler32(unsigned char *buf, long len)␊
707{␊
708 unsigned long s1 = 1; // adler & 0xffff;␊
709 unsigned long s2 = 0; // (adler >> 16) & 0xffff;␊
710 unsigned long result;␊
711 int k;␊
712␊
713 while (len > 0) {␊
714 k = len < NMAX ? len : NMAX;␊
715 len -= k;␊
716 while (k >= 16) {␊
717 DO16(buf);␊
718 buf += 16;␊
719 k -= 16;␊
720 }␊
721 if (k != 0) do {␊
722 s1 += *buf++;␊
723 s2 += s1;␊
724 } while (--k);␊
725 s1 %= BASE;␊
726 s2 %= BASE;␊
727 }␊
728 result = (s2 << 16) | s1;␊
729 return OSSwapHostToBigInt32(result);␊
730}␊
731

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