| 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 | /* ␊ |
| 26 | * Mach Operating System␊ |
| 27 | * Copyright (c) 1990 Carnegie-Mellon University␊ |
| 28 | * Copyright (c) 1989 Carnegie-Mellon University␊ |
| 29 | * All rights reserved.␉ The CMU software License Agreement specifies␊ |
| 30 | * the terms and conditions for use and redistribution.␊ |
| 31 | */␊ |
| 32 | ␊ |
| 33 | /*␊ |
| 34 | *␉␉␉INTEL CORPORATION PROPRIETARY INFORMATION␊ |
| 35 | *␊ |
| 36 | *␉This software is supplied under the terms of a license␉agreement or ␊ |
| 37 | *␉nondisclosure agreement with Intel Corporation and may not be copied ␊ |
| 38 | *␉nor disclosed except in accordance with the terms of that agreement.␊ |
| 39 | *␊ |
| 40 | *␉Copyright 1988, 1989 by Intel Corporation␊ |
| 41 | */␊ |
| 42 | ␊ |
| 43 | /*␊ |
| 44 | * Copyright 1993 NeXT Computer, Inc.␊ |
| 45 | * All rights reserved.␊ |
| 46 | */␊ |
| 47 | ␊ |
| 48 | /*␊ |
| 49 | * Completely reworked by Sam Streeper (sam_s@NeXT.com)␊ |
| 50 | * Reworked again by Curtis Galloway (galloway@NeXT.com)␊ |
| 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 "modules.h"␊ |
| 62 | #include "device_tree.h"␊ |
| 63 | ␊ |
| 64 | #ifndef DEBUG_BOOT2␊ |
| 65 | #define DEBUG_BOOT2 0␊ |
| 66 | #endif␊ |
| 67 | ␊ |
| 68 | #if DEBUG_BOOT2␊ |
| 69 | #define DBG(x...)␉printf(x)␊ |
| 70 | #else␊ |
| 71 | #define DBG(x...)␉msglog(x)␊ |
| 72 | #endif␊ |
| 73 | ␊ |
| 74 | /*␊ |
| 75 | * How long to wait (in seconds) to load the␊ |
| 76 | * kernel after displaying the "boot:" prompt.␊ |
| 77 | */␊ |
| 78 | #define kBootErrorTimeout 5␊ |
| 79 | ␊ |
| 80 | bool␉␉gOverrideKernel, gEnableCDROMRescan, gScanSingleDrive, useGUI;␊ |
| 81 | static bool␉gUnloadPXEOnExit = false;␊ |
| 82 | ␊ |
| 83 | static char␉gCacheNameAdler[64 + 256];␊ |
| 84 | char␉␉*gPlatformName = gCacheNameAdler;␊ |
| 85 | ␊ |
| 86 | char␉␉gRootDevice[ROOT_DEVICE_SIZE];␊ |
| 87 | char␉␉gMKextName[512];␊ |
| 88 | char␉␉gMacOSVersion[8];␊ |
| 89 | int␉␉bvCount = 0, gDeviceCount = 0;␊ |
| 90 | //int␉␉menucount = 0;␊ |
| 91 | long␉␉gBootMode; /* defaults to 0 == kBootModeNormal */␊ |
| 92 | BVRef␉␉bvr, menuBVR, bvChain;␊ |
| 93 | ␊ |
| 94 | static bool␉␉␉␉checkOSVersion(const char * version);␊ |
| 95 | static void␉␉␉␉getOSVersion();␊ |
| 96 | static unsigned long␉Adler32(unsigned char *buffer, long length);␊ |
| 97 | //static void␉␉␉selectBiosDevice(void);␊ |
| 98 | ␊ |
| 99 | /** options.c **/␊ |
| 100 | extern char* msgbuf;␊ |
| 101 | void showTextBuffer(char *buf, int size);␊ |
| 102 | ␊ |
| 103 | ␊ |
| 104 | //==========================================================================␊ |
| 105 | // Zero the BSS.␊ |
| 106 | ␊ |
| 107 | static void zeroBSS(void)␊ |
| 108 | {␊ |
| 109 | ␉extern char bss_start __asm("section$start$__DATA$__bss");␊ |
| 110 | ␉extern char bss_end __asm("section$end$__DATA$__bss");␊ |
| 111 | ␉extern char common_start __asm("section$start$__DATA$__common");␊ |
| 112 | ␉extern char common_end __asm("section$end$__DATA$__common");␊ |
| 113 | ␊ |
| 114 | ␉bzero(&bss_start, (&bss_end - &bss_start));␊ |
| 115 | ␉bzero(&common_start, (&common_end - &common_start));␊ |
| 116 | }␊ |
| 117 | ␊ |
| 118 | //==========================================================================␊ |
| 119 | // Malloc error function␊ |
| 120 | ␊ |
| 121 | static void malloc_error(char *addr, size_t size, const char *file, int line)␊ |
| 122 | {␊ |
| 123 | ␉stop("\nMemory allocation error! Addr: 0x%x, Size: 0x%x, File: %s, Line: %d\n",␊ |
| 124 | ␉␉␉␉␉␉␉␉␉ (unsigned)addr, (unsigned)size, file, line);␊ |
| 125 | }␊ |
| 126 | ␊ |
| 127 | //==========================================================================␊ |
| 128 | //Initializes the runtime. Right now this means zeroing the BSS and initializing malloc.␊ |
| 129 | //␊ |
| 130 | void initialize_runtime(void)␊ |
| 131 | {␊ |
| 132 | ␉zeroBSS();␊ |
| 133 | ␉malloc_init(0, 0, 0, malloc_error);␊ |
| 134 | }␊ |
| 135 | ␊ |
| 136 | //==========================================================================␊ |
| 137 | // execKernel - Load the kernel image (mach-o) and jump to its entry point.␊ |
| 138 | ␊ |
| 139 | static int ExecKernel(void *binary)␊ |
| 140 | {␊ |
| 141 | ␉int␉␉␉ret;␊ |
| 142 | ␉entry_t␉␉kernelEntry;␊ |
| 143 | ␊ |
| 144 | ␉bootArgs->kaddr = bootArgs->ksize = 0;␊ |
| 145 | ␉execute_hook("ExecKernel", (void*)binary, NULL, NULL, NULL);␊ |
| 146 | ␊ |
| 147 | ␉ret = DecodeKernel(binary,␊ |
| 148 | ␉␉␉␉␉ &kernelEntry,␊ |
| 149 | ␉␉␉␉␉ (char **) &bootArgs->kaddr,␊ |
| 150 | ␉␉␉␉␉ (int *)&bootArgs->ksize );␊ |
| 151 | ␊ |
| 152 | ␉if ( ret != 0 )␊ |
| 153 | ␉␉return ret;␊ |
| 154 | ␊ |
| 155 | ␉// Reserve space for boot args␊ |
| 156 | ␉reserveKernBootStruct();␊ |
| 157 | ␊ |
| 158 | ␉// Notify modules that the kernel has been decoded␊ |
| 159 | ␉execute_hook("DecodedKernel", (void*)binary, (void*)bootArgs->kaddr, (void*)bootArgs->ksize, NULL);␊ |
| 160 | ␊ |
| 161 | ␉setupFakeEfi();␊ |
| 162 | ␊ |
| 163 | ␉// Load boot drivers from the specifed root path.␊ |
| 164 | ␉//if (!gHaveKernelCache)␊ |
| 165 | ␉LoadDrivers("/");␊ |
| 166 | ␊ |
| 167 | ␉execute_hook("DriversLoaded", (void*)binary, NULL, NULL, NULL);␊ |
| 168 | ␊ |
| 169 | ␉clearActivityIndicator();␊ |
| 170 | ␊ |
| 171 | ␉if (gErrors) {␊ |
| 172 | ␉␉printf("Errors encountered while starting up the computer.\n");␊ |
| 173 | ␉␉printf("Pausing %d seconds...\n", kBootErrorTimeout);␊ |
| 174 | ␉␉sleep(kBootErrorTimeout);␊ |
| 175 | ␉}␊ |
| 176 | ␊ |
| 177 | ␉md0Ramdisk();␊ |
| 178 | ␊ |
| 179 | ␉// Cleanup the PXE base code.␊ |
| 180 | ␊ |
| 181 | ␉if ( (gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit ) {␊ |
| 182 | ␉␉if ( (ret = nbpUnloadBaseCode()) != nbpStatusSuccess ) {␊ |
| 183 | ␉␉␉printf("nbpUnloadBaseCode error %d\n", (int) ret);␊ |
| 184 | ␉␉␉sleep(2);␊ |
| 185 | ␉␉}␊ |
| 186 | ␉}␊ |
| 187 | ␊ |
| 188 | ␉bool dummyVal;␊ |
| 189 | ␉if (getBoolForKey(kWaitForKeypressKey, &dummyVal, &bootInfo->chameleonConfig) && dummyVal) {␊ |
| 190 | ␉␉showTextBuffer(msgbuf, strlen(msgbuf));␊ |
| 191 | ␉}␊ |
| 192 | ␊ |
| 193 | ␉usb_loop();␊ |
| 194 | ␊ |
| 195 | ␉// If we were in text mode, switch to graphics mode.␊ |
| 196 | ␉// This will draw the boot graphics unless we are in␊ |
| 197 | ␉// verbose mode.␊ |
| 198 | ␉if (gVerboseMode) {␊ |
| 199 | ␉␉setVideoMode( GRAPHICS_MODE, 0 );␊ |
| 200 | ␉} else {␊ |
| 201 | ␉␉drawBootGraphics();␊ |
| 202 | ␉}␊ |
| 203 | ␊ |
| 204 | ␉DBG("Starting Darwin/%s [%s]\n",( archCpuType == CPU_TYPE_I386 ) ? "x86" : "x86_64", gDarwinBuildVerStr);␊ |
| 205 | ␉DBG("Boot Args: %s\n", bootArgs->CommandLine);␊ |
| 206 | ␊ |
| 207 | ␉setupBooterLog();␊ |
| 208 | ␊ |
| 209 | ␉finalizeBootStruct();␊ |
| 210 | ␊ |
| 211 | ␉// Jump to kernel's entry point. There's no going back now.␊ |
| 212 | ␉if ((checkOSVersion("10.7")) || (checkOSVersion("10.8")) || (checkOSVersion("10.9")))␊ |
| 213 | ␉{␊ |
| 214 | ␊ |
| 215 | ␉␉// Notify modules that the kernel is about to be started␊ |
| 216 | ␉␉execute_hook("Kernel Start", (void*)kernelEntry, (void*)bootArgs, NULL, NULL);␊ |
| 217 | ␊ |
| 218 | ␉␉// Masking out so that Lion doesn't doublefault␊ |
| 219 | ␉␉outb(0x21, 0xff);␉/* Maskout all interrupts Pic1 */␊ |
| 220 | ␉␉outb(0xa1, 0xff);␉/* Maskout all interrupts Pic2 */␊ |
| 221 | ␊ |
| 222 | ␉␉startprog( kernelEntry, bootArgs );␊ |
| 223 | ␉} else {␊ |
| 224 | ␉␉// Notify modules that the kernel is about to be started␊ |
| 225 | ␉␉execute_hook("Kernel Start", (void*)kernelEntry, (void*)bootArgsPreLion, NULL, NULL);␊ |
| 226 | ␊ |
| 227 | ␉␉startprog( kernelEntry, bootArgsPreLion );␊ |
| 228 | ␉}␊ |
| 229 | ␊ |
| 230 | ␉// Not reached␊ |
| 231 | ␉return 0;␊ |
| 232 | }␊ |
| 233 | ␊ |
| 234 | ␊ |
| 235 | //==========================================================================␊ |
| 236 | // LoadKernelCache - Try to load Kernel Cache.␊ |
| 237 | // return the length of the loaded cache file or -1 on error␊ |
| 238 | long LoadKernelCache(const char* cacheFile, void **binary)␊ |
| 239 | {␊ |
| 240 | ␉char␉␉kernelCacheFile[512];␊ |
| 241 | ␉char␉␉kernelCachePath[512];␊ |
| 242 | ␉long␉␉flags, time, cachetime, kerneltime, exttime, ret=-1;␊ |
| 243 | ␉unsigned long adler32;␊ |
| 244 | ␊ |
| 245 | ␉if((gBootMode & kBootModeSafe) != 0) {␊ |
| 246 | ␉␉DBG("Kernel Cache ignored.\n");␊ |
| 247 | ␉␉return -1;␊ |
| 248 | ␉}␊ |
| 249 | ␊ |
| 250 | ␉// Use specify kernel cache file if not empty␊ |
| 251 | ␉if (cacheFile[0] != 0)␊ |
| 252 | ␉{␊ |
| 253 | ␉␉strlcpy(kernelCacheFile, cacheFile, sizeof(kernelCacheFile));␊ |
| 254 | ␉}␊ |
| 255 | ␉else␊ |
| 256 | ␉{␊ |
| 257 | ␉␉// Lion, Mountain Lion and Mavericks prelink kernel cache file␊ |
| 258 | ␉␉if ((checkOSVersion("10.7")) || (checkOSVersion("10.8")) || (checkOSVersion("10.9")))␊ |
| 259 | ␉␉{␊ |
| 260 | ␉␉␉snprintf(kernelCacheFile, sizeof(kernelCacheFile), "%skernelcache", kDefaultCachePathSnow);␊ |
| 261 | ␉␉}␊ |
| 262 | ␉␉// Snow Leopard prelink kernel cache file␊ |
| 263 | ␉␉else if (checkOSVersion("10.6")) {␊ |
| 264 | ␉␉␉snprintf(kernelCacheFile, sizeof(kernelCacheFile), "kernelcache_%s",␊ |
| 265 | ␉␉␉␉(archCpuType == CPU_TYPE_I386) ? "i386" : "x86_64");␊ |
| 266 | ␊ |
| 267 | ␉␉␉int␉lnam = strlen(kernelCacheFile) + 9; //with adler32␊ |
| 268 | ␉␉␉char␉*name;␊ |
| 269 | ␉␉␉long␉prev_time = 0;␊ |
| 270 | ␊ |
| 271 | ␉␉␉struct␉dirstuff* cacheDir = opendir(kDefaultCachePathSnow);␊ |
| 272 | ␊ |
| 273 | ␉␉␉/* TODO: handle error? */␊ |
| 274 | ␉␉␉if (cacheDir) {␊ |
| 275 | ␉␉␉␉while(readdir(cacheDir, (const char**)&name, &flags, &time) >= 0) {␊ |
| 276 | ␉␉␉␉␉if (((flags & kFileTypeMask) != kFileTypeDirectory) && time > prev_time␊ |
| 277 | ␉␉␉␉␉␉&& strstr(name, kernelCacheFile) && (name[lnam] != '.')) {␊ |
| 278 | ␉␉␉␉␉␉snprintf(kernelCacheFile, sizeof(kernelCacheFile), "%s%s", kDefaultCachePathSnow, name);␊ |
| 279 | ␉␉␉␉␉␉prev_time = time;␊ |
| 280 | ␉␉␉␉␉}␊ |
| 281 | ␉␉␉␉}␊ |
| 282 | ␉␉␉}␊ |
| 283 | ␉␉␉closedir(cacheDir);␊ |
| 284 | ␉␉} else {␊ |
| 285 | ␉␉␉// Reset cache name.␊ |
| 286 | ␉␉␉bzero(gCacheNameAdler + 64, sizeof(gCacheNameAdler) - 64);␊ |
| 287 | ␉␉␉snprintf(gCacheNameAdler + 64, sizeof(gCacheNameAdler) - 64,␊ |
| 288 | ␉␉␉␉"%s,%s",␊ |
| 289 | ␉␉␉␉gRootDevice, bootInfo->bootFile);␊ |
| 290 | ␉␉␉adler32 = Adler32((unsigned char *)gCacheNameAdler, sizeof(gCacheNameAdler));␊ |
| 291 | ␉␉␉snprintf(kernelCacheFile, sizeof(kernelCacheFile), "%s.%08lX", kDefaultCachePathLeo, adler32);␊ |
| 292 | ␉␉}␊ |
| 293 | ␉}␊ |
| 294 | ␊ |
| 295 | ␉// Check if the kernel cache file exists␊ |
| 296 | ␉ret = -1;␊ |
| 297 | ␊ |
| 298 | ␉// If boot from a boot helper partition check the kernel cache file on it␊ |
| 299 | ␉if (gBootVolume->flags & kBVFlagBooter) {␊ |
| 300 | ␉␉snprintf(kernelCachePath, sizeof(kernelCachePath), "com.apple.boot.P%s", kernelCacheFile);␊ |
| 301 | ␉␉ret = GetFileInfo(NULL, kernelCachePath, &flags, &cachetime);␊ |
| 302 | ␉␉if ((ret == -1) || ((flags & kFileTypeMask) != kFileTypeFlat)) {␊ |
| 303 | ␉␉␉snprintf(kernelCachePath, sizeof(kernelCachePath), "com.apple.boot.R%s", kernelCacheFile);␊ |
| 304 | ␉␉␉ret = GetFileInfo(NULL, kernelCachePath, &flags, &cachetime);␊ |
| 305 | ␉␉␉if ((ret == -1) || ((flags & kFileTypeMask) != kFileTypeFlat)) {␊ |
| 306 | ␉␉␉␉snprintf(kernelCachePath, sizeof(kernelCachePath), "com.apple.boot.S%s", kernelCacheFile);␊ |
| 307 | ␉␉␉␉ret = GetFileInfo(NULL, kernelCachePath, &flags, &cachetime);␊ |
| 308 | ␉␉␉␉if ((flags & kFileTypeMask) != kFileTypeFlat) {␊ |
| 309 | ␉␉␉␉␉ret = -1;␊ |
| 310 | ␉␉␉␉}␊ |
| 311 | ␉␉␉}␊ |
| 312 | ␉␉}␊ |
| 313 | ␉}␊ |
| 314 | ␉// If not found, use the original kernel cache path.␊ |
| 315 | ␉if (ret == -1) {␊ |
| 316 | ␉␉strlcpy(kernelCachePath, kernelCacheFile, sizeof(kernelCachePath));␊ |
| 317 | ␉␉ret = GetFileInfo(NULL, kernelCachePath, &flags, &cachetime);␊ |
| 318 | ␉␉if ((flags & kFileTypeMask) != kFileTypeFlat) {␊ |
| 319 | ␉␉␉ret = -1;␊ |
| 320 | ␉␉}␊ |
| 321 | ␉}␊ |
| 322 | ␊ |
| 323 | ␉// Exit if kernel cache file wasn't found␊ |
| 324 | ␉if (ret == -1) {␊ |
| 325 | ␉␉DBG("No Kernel Cache File '%s' found\n", kernelCacheFile);␊ |
| 326 | ␉␉return -1;␊ |
| 327 | ␉}␊ |
| 328 | ␊ |
| 329 | ␉// Check if the kernel cache file is more recent (mtime)␊ |
| 330 | ␉// than the kernel file or the S/L/E directory␊ |
| 331 | ␉ret = GetFileInfo(NULL, bootInfo->bootFile, &flags, &kerneltime);␊ |
| 332 | ␉// Check if the kernel file is more recent than the cache file␊ |
| 333 | ␉if ((ret == 0) && ((flags & kFileTypeMask) == kFileTypeFlat)␊ |
| 334 | ␉␉&& (kerneltime > cachetime)) {␊ |
| 335 | ␉␉DBG("Kernel file (%s) is more recent than Kernel Cache (%s)! Ignoring Kernel Cache.\n",␊ |
| 336 | ␉␉␉␉bootInfo->bootFile, kernelCacheFile);␊ |
| 337 | ␉␉return -1;␊ |
| 338 | ␉}␊ |
| 339 | ␊ |
| 340 | ␉ret = GetFileInfo("/System/Library/", "Extensions", &flags, &exttime);␊ |
| 341 | ␉// Check if the S/L/E directory time is more recent than the cache file␊ |
| 342 | ␉if ((ret == 0) && ((flags & kFileTypeMask) == kFileTypeDirectory)␊ |
| 343 | ␉␉&& (exttime > cachetime)) {␊ |
| 344 | ␉␉DBG("Folder: '/System/Library/Extensions' is more recent than Kernel Cache file (%s)! Ignoring Kernel Cache.\n",␊ |
| 345 | ␉␉␉␉kernelCacheFile);␊ |
| 346 | ␉␉return -1;␊ |
| 347 | ␉}␊ |
| 348 | ␊ |
| 349 | ␉// Since the kernel cache file exists and is the most recent try to load it␊ |
| 350 | ␉DBG("Loading kernel cache: '%s'\n", kernelCachePath);␊ |
| 351 | ␊ |
| 352 | ␉ret = LoadThinFatFile(kernelCachePath, binary);␊ |
| 353 | ␉return ret; // ret contain the length of the binary␊ |
| 354 | }␊ |
| 355 | ␊ |
| 356 | //==========================================================================␊ |
| 357 | // This is the entrypoint from real-mode which functions exactly as it did␊ |
| 358 | // before. Multiboot does its own runtime initialization, does some of its␊ |
| 359 | // own things, and then calls common_boot.␊ |
| 360 | void boot(int biosdev)␊ |
| 361 | {␊ |
| 362 | ␉initialize_runtime();␊ |
| 363 | ␉// Enable A20 gate before accessing memory above 1Mb.␊ |
| 364 | ␉enableA20();␊ |
| 365 | ␉common_boot(biosdev);␊ |
| 366 | }␊ |
| 367 | ␊ |
| 368 | //==========================================================================␊ |
| 369 | // The 'main' function for the booter. Called by boot0 when booting␊ |
| 370 | // from a block device, or by the network booter.␊ |
| 371 | //␊ |
| 372 | // arguments:␊ |
| 373 | //␉ biosdev - Value passed from boot1/NBP to specify the device␊ |
| 374 | //␉␉␉ that the booter was loaded from.␊ |
| 375 | //␊ |
| 376 | // If biosdev is kBIOSDevNetwork, then this function will return if␊ |
| 377 | // booting was unsuccessful. This allows the PXE firmware to try the␊ |
| 378 | // next boot device on its list.␊ |
| 379 | void common_boot(int biosdev)␊ |
| 380 | {␊ |
| 381 | ␉bool␉ ␉␉quiet;␊ |
| 382 | ␉bool␉ ␉␉firstRun = true;␊ |
| 383 | ␉bool␉ ␉␉instantMenu;␊ |
| 384 | ␉bool␉ ␉␉rescanPrompt;␊ |
| 385 | ␉int␉␉␉␉status;␊ |
| 386 | ␉unsigned int␉allowBVFlags = kBVFlagSystemVolume | kBVFlagForeignBoot;␊ |
| 387 | ␉unsigned int␉denyBVFlags = kBVFlagEFISystem;␊ |
| 388 | ␊ |
| 389 | ␉// Set reminder to unload the PXE base code. Neglect to unload␊ |
| 390 | ␉// the base code will result in a hang or kernel panic.␊ |
| 391 | ␉gUnloadPXEOnExit = true;␊ |
| 392 | ␊ |
| 393 | ␉// Record the device that the booter was loaded from.␊ |
| 394 | ␉gBIOSDev = biosdev & kBIOSDevMask;␊ |
| 395 | ␊ |
| 396 | ␉// Initialize boot-log␊ |
| 397 | ␉initBooterLog();␊ |
| 398 | ␊ |
| 399 | ␉// Initialize boot info structure.␊ |
| 400 | ␉initKernBootStruct();␊ |
| 401 | ␊ |
| 402 | ␉// Setup VGA text mode.␊ |
| 403 | ␉// Not sure if it is safe to call setVideoMode() before the␊ |
| 404 | ␉// config table has been loaded. Call video_mode() instead.␊ |
| 405 | #if DEBUG␊ |
| 406 | ␉printf("before video_mode\n");␊ |
| 407 | #endif␊ |
| 408 | ␉video_mode( 2 ); // 80x25 mono text mode.␊ |
| 409 | #if DEBUG␊ |
| 410 | ␉printf("after video_mode\n");␊ |
| 411 | #endif␊ |
| 412 | ␊ |
| 413 | ␉// Scan and record the system's hardware information.␊ |
| 414 | ␉scan_platform();␊ |
| 415 | ␊ |
| 416 | ␉// First get info for boot volume.␊ |
| 417 | ␉scanBootVolumes(gBIOSDev, 0);␊ |
| 418 | ␉bvChain = getBVChainForBIOSDev(gBIOSDev);␊ |
| 419 | ␉setBootGlobals(bvChain);␊ |
| 420 | ␊ |
| 421 | ␉// Load boot.plist config file␊ |
| 422 | ␉status = loadChameleonConfig(&bootInfo->chameleonConfig, bvChain);␊ |
| 423 | ␊ |
| 424 | ␉if (getBoolForKey(kQuietBootKey, &quiet, &bootInfo->chameleonConfig) && quiet) {␊ |
| 425 | ␉␉gBootMode |= kBootModeQuiet;␊ |
| 426 | ␉}␊ |
| 427 | ␊ |
| 428 | ␉// Override firstRun to get to the boot menu instantly by setting "Instant Menu"=y in system config␊ |
| 429 | ␉if (getBoolForKey(kInstantMenuKey, &instantMenu, &bootInfo->chameleonConfig) && instantMenu) {␊ |
| 430 | ␉␉firstRun = false;␊ |
| 431 | ␉}␊ |
| 432 | ␊ |
| 433 | ␉// Loading preboot ramdisk if exists.␊ |
| 434 | ␉loadPrebootRAMDisk();␊ |
| 435 | ␊ |
| 436 | ␉// Disable rescan option by default␊ |
| 437 | ␉gEnableCDROMRescan = false;␊ |
| 438 | ␊ |
| 439 | ␉// Enable it with Rescan=y in system config␊ |
| 440 | ␉if (getBoolForKey(kRescanKey, &gEnableCDROMRescan, &bootInfo->chameleonConfig)␊ |
| 441 | ␉␉&& gEnableCDROMRescan) {␊ |
| 442 | ␉␉gEnableCDROMRescan = true;␊ |
| 443 | ␉}␊ |
| 444 | ␊ |
| 445 | ␉// Ask the user for Rescan option by setting "Rescan Prompt"=y in system config.␊ |
| 446 | ␉rescanPrompt = false;␊ |
| 447 | ␉if (getBoolForKey(kRescanPromptKey, &rescanPrompt , &bootInfo->chameleonConfig)␊ |
| 448 | ␉␉&& rescanPrompt && biosDevIsCDROM(gBIOSDev))␊ |
| 449 | ␉{␊ |
| 450 | ␉␉gEnableCDROMRescan = promptForRescanOption();␊ |
| 451 | ␉}␊ |
| 452 | ␊ |
| 453 | ␉// Enable touching a single BIOS device only if "Scan Single Drive"=y is set in system config.␊ |
| 454 | ␉if (getBoolForKey(kScanSingleDriveKey, &gScanSingleDrive, &bootInfo->chameleonConfig)␊ |
| 455 | ␉␉&& gScanSingleDrive) {␊ |
| 456 | ␉␉gScanSingleDrive = true;␊ |
| 457 | ␉}␊ |
| 458 | ␊ |
| 459 | ␉// Create a list of partitions on device(s).␊ |
| 460 | ␉if (gScanSingleDrive) {␊ |
| 461 | ␉␉scanBootVolumes(gBIOSDev, &bvCount);␊ |
| 462 | ␉} else {␊ |
| 463 | ␉␉scanDisks(gBIOSDev, &bvCount);␊ |
| 464 | ␉}␊ |
| 465 | ␊ |
| 466 | ␉// Create a separated bvr chain using the specified filters.␊ |
| 467 | ␉bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊ |
| 468 | ␊ |
| 469 | ␉gBootVolume = selectBootVolume(bvChain);␊ |
| 470 | ␊ |
| 471 | ␉// Intialize module system␊ |
| 472 | ␉init_module_system();␊ |
| 473 | ␊ |
| 474 | #if DEBUG␊ |
| 475 | ␉printf(" Default: %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n",␊ |
| 476 | ␉␉␉ gBootVolume, gBootVolume->biosdev, gBootVolume->part_no, gBootVolume->flags);␊ |
| 477 | ␉printf(" bt(0,0): %d, ->biosdev: %d, ->part_no: %d ->flags: %d\n",␊ |
| 478 | ␉␉␉ gBIOSBootVolume, gBIOSBootVolume->biosdev, gBIOSBootVolume->part_no, gBIOSBootVolume->flags);␊ |
| 479 | ␉getchar();␊ |
| 480 | #endif␊ |
| 481 | ␊ |
| 482 | ␉useGUI = true;␊ |
| 483 | ␉// Override useGUI default␊ |
| 484 | ␉getBoolForKey(kGUIKey, &useGUI, &bootInfo->chameleonConfig);␊ |
| 485 | ␉if (useGUI && initGUI())␊ |
| 486 | ␉{␊ |
| 487 | ␉␉// initGUI() returned with an error, disabling GUI.␊ |
| 488 | ␉␉useGUI = false;␊ |
| 489 | ␉}␊ |
| 490 | ␊ |
| 491 | ␉setBootGlobals(bvChain);␊ |
| 492 | ␊ |
| 493 | ␉// Parse args, load and start kernel.␊ |
| 494 | ␉while (1)␊ |
| 495 | ␉{␊ |
| 496 | ␉␉bool␉␉tryresume, tryresumedefault, forceresume;␊ |
| 497 | ␉␉bool␉␉useKernelCache = true; // by default try to use the prelinked kernel␊ |
| 498 | ␉␉const char␉*val;␊ |
| 499 | ␉␉int␉␉␉len, ret = -1;␊ |
| 500 | ␉␉long␉␉flags, sleeptime, time;␊ |
| 501 | ␉␉void␉␉*binary = (void *)kLoadAddr;␊ |
| 502 | ␊ |
| 503 | ␉␉char bootFile[sizeof(bootInfo->bootFile)];␊ |
| 504 | ␉␉char␉␉bootFilePath[512];␊ |
| 505 | ␉␉char␉␉kernelCacheFile[512];␊ |
| 506 | ␊ |
| 507 | ␉␉// Initialize globals.␊ |
| 508 | ␉␉sysConfigValid = false;␊ |
| 509 | ␉␉gErrors␉␉ = false;␊ |
| 510 | ␊ |
| 511 | ␉␉status = getBootOptions(firstRun);␊ |
| 512 | ␉␉firstRun = false;␊ |
| 513 | ␉␉if (status == -1) continue;␊ |
| 514 | ␊ |
| 515 | ␉␉status = processBootOptions();␊ |
| 516 | ␉␉// Status == 1 means to chainboot␊ |
| 517 | ␉␉if ( status ==␉1 ) break;␊ |
| 518 | ␉␉// Status == -1 means that the config file couldn't be loaded or that gBootVolume is NULL␊ |
| 519 | ␉␉if ( status == -1 )␊ |
| 520 | ␉␉{␊ |
| 521 | ␉␉␉// gBootVolume == NULL usually means the user hit escape.␊ |
| 522 | ␉␉␉if (gBootVolume == NULL)␊ |
| 523 | ␉␉␉{␊ |
| 524 | ␉␉␉␉freeFilteredBVChain(bvChain);␊ |
| 525 | ␊ |
| 526 | ␉␉␉␉if (gEnableCDROMRescan)␊ |
| 527 | ␉␉␉␉␉rescanBIOSDevice(gBIOSDev);␊ |
| 528 | ␊ |
| 529 | ␉␉␉␉bvChain = newFilteredBVChain(0x80, 0xFF, allowBVFlags, denyBVFlags, &gDeviceCount);␊ |
| 530 | ␉␉␉␉setBootGlobals(bvChain);␊ |
| 531 | ␉␉␉␉setupDeviceList(&bootInfo->themeConfig);␊ |
| 532 | ␉␉␉}␊ |
| 533 | ␉␉␉continue;␊ |
| 534 | ␉␉}␊ |
| 535 | ␊ |
| 536 | ␉␉// Other status (e.g. 0) means that we should proceed with boot.␊ |
| 537 | ␊ |
| 538 | ␉␉// Turn off any GUI elements␊ |
| 539 | ␉␉if ( bootArgs->Video.v_display == GRAPHICS_MODE )␊ |
| 540 | ␉␉{␊ |
| 541 | ␉␉␉gui.devicelist.draw = false;␊ |
| 542 | ␉␉␉gui.bootprompt.draw = false;␊ |
| 543 | ␉␉␉gui.menu.draw = false;␊ |
| 544 | ␉␉␉gui.infobox.draw = false;␊ |
| 545 | ␉␉␉gui.logo.draw = false;␊ |
| 546 | ␉␉␉drawBackground();␊ |
| 547 | ␉␉␉updateVRAM();␊ |
| 548 | ␉␉}␊ |
| 549 | ␊ |
| 550 | ␉␉// Find out which version mac os we're booting.␊ |
| 551 | ␉␉getOSVersion();␊ |
| 552 | ␊ |
| 553 | ␉␉if (platformCPUFeature(CPU_FEATURE_EM64T)) {␊ |
| 554 | ␉␉␉archCpuType = CPU_TYPE_X86_64;␊ |
| 555 | ␉␉} else {␊ |
| 556 | ␉␉␉archCpuType = CPU_TYPE_I386;␊ |
| 557 | ␉␉}␊ |
| 558 | ␊ |
| 559 | ␉␉if (getValueForKey(karch, &val, &len, &bootInfo->chameleonConfig)) {␊ |
| 560 | ␉␉␉if (strncmp(val, "i386", 4) == 0) {␊ |
| 561 | ␉␉␉␉archCpuType = CPU_TYPE_I386;␊ |
| 562 | ␉␉␉}␊ |
| 563 | ␉␉}␊ |
| 564 | ␊ |
| 565 | ␉␉if (getValueForKey(kKernelArchKey, &val, &len, &bootInfo->chameleonConfig)) {␊ |
| 566 | ␉␉␉if (strncmp(val, "i386", 4) == 0) {␊ |
| 567 | ␉␉␉␉archCpuType = CPU_TYPE_I386;␊ |
| 568 | ␉␉␉}␊ |
| 569 | ␉␉}␊ |
| 570 | ␊ |
| 571 | ␉␉// Notify modules that we are attempting to boot␊ |
| 572 | ␉␉execute_hook("PreBoot", NULL, NULL, NULL, NULL);␊ |
| 573 | ␊ |
| 574 | ␉␉if (!getBoolForKey (kWake, &tryresume, &bootInfo->chameleonConfig)) {␊ |
| 575 | ␉␉␉tryresume = true;␊ |
| 576 | ␉␉␉tryresumedefault = true;␊ |
| 577 | ␉␉} else {␊ |
| 578 | ␉␉␉tryresumedefault = false;␊ |
| 579 | ␉␉}␊ |
| 580 | ␊ |
| 581 | ␉␉if (!getBoolForKey (kForceWake, &forceresume, &bootInfo->chameleonConfig)) {␊ |
| 582 | ␉␉␉forceresume = false;␊ |
| 583 | ␉␉}␊ |
| 584 | ␊ |
| 585 | ␉␉if (forceresume) {␊ |
| 586 | ␉␉␉tryresume = true;␊ |
| 587 | ␉␉␉tryresumedefault = false;␊ |
| 588 | ␉␉}␊ |
| 589 | ␊ |
| 590 | ␉␉while (tryresume) {␊ |
| 591 | ␉␉␉const char *tmp;␊ |
| 592 | ␉␉␉BVRef bvr;␊ |
| 593 | ␉␉␉if (!getValueForKey(kWakeImage, &val, &len, &bootInfo->chameleonConfig))␊ |
| 594 | ␉␉␉␉val = "/private/var/vm/sleepimage";␊ |
| 595 | ␊ |
| 596 | ␉␉␉// Do this first to be sure that root volume is mounted␊ |
| 597 | ␉␉␉ret = GetFileInfo(0, val, &flags, &sleeptime);␊ |
| 598 | ␊ |
| 599 | ␉␉␉if ((bvr = getBootVolumeRef(val, &tmp)) == NULL)␊ |
| 600 | ␉␉␉␉break;␊ |
| 601 | ␊ |
| 602 | ␉␉␉// Can't check if it was hibernation Wake=y is required␊ |
| 603 | ␉␉␉if (bvr->modTime == 0 && tryresumedefault)␊ |
| 604 | ␉␉␉␉break;␊ |
| 605 | ␊ |
| 606 | ␉␉␉if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat))␊ |
| 607 | ␉␉␉␉break;␊ |
| 608 | ␊ |
| 609 | ␉␉␉if (!forceresume && ((sleeptime+3)<bvr->modTime)) {␊ |
| 610 | #if DEBUG␊ |
| 611 | ␉␉␉␉printf ("Hibernate image is too old by %d seconds. Use ForceWake=y to override\n",␊ |
| 612 | ␉␉␉␉␉␉bvr->modTime-sleeptime);␊ |
| 613 | #endif␊ |
| 614 | ␉␉␉␉break;␊ |
| 615 | ␉␉␉}␊ |
| 616 | ␊ |
| 617 | ␉␉␉HibernateBoot((char *)val);␊ |
| 618 | ␉␉␉break;␊ |
| 619 | ␉␉}␊ |
| 620 | ␊ |
| 621 | ␉␉getBoolForKey(kUseKernelCache, &useKernelCache, &bootInfo->chameleonConfig);␊ |
| 622 | ␉␉if (useKernelCache) do {␊ |
| 623 | ␊ |
| 624 | ␉␉␉// Determine the name of the Kernel Cache␊ |
| 625 | ␉␉␉if (getValueForKey(kKernelCacheKey, &val, &len, &bootInfo->bootConfig)) {␊ |
| 626 | ␉␉␉␉if (val[0] == '\\')␊ |
| 627 | ␉␉␉␉{␊ |
| 628 | ␉␉␉␉␉len--;␊ |
| 629 | ␉␉␉␉␉val++;␊ |
| 630 | ␉␉␉␉}␊ |
| 631 | ␉␉␉␉/* FIXME: check len vs sizeof(kernelCacheFile) */␊ |
| 632 | ␉␉␉␉strlcpy(kernelCacheFile, val, len + 1);␊ |
| 633 | ␉␉␉} else {␊ |
| 634 | ␉␉␉␉kernelCacheFile[0] = 0; // Use default kernel cache file␊ |
| 635 | ␉␉␉}␊ |
| 636 | ␊ |
| 637 | ␉␉␉if (gOverrideKernel && kernelCacheFile[0] == 0) {␊ |
| 638 | ␉␉␉␉DBG("Using a non default kernel (%s) without specifying 'Kernel Cache' path, KernelCache will not be used\n", bootInfo->bootFile);␊ |
| 639 | ␉␉␉␉useKernelCache = false;␊ |
| 640 | ␉␉␉␉break;␊ |
| 641 | ␉␉␉}␊ |
| 642 | ␉␉␉if (gMKextName[0] != 0) {␊ |
| 643 | ␉␉␉␉DBG("Using a specific MKext Cache (%s), KernelCache will not be used\n",␊ |
| 644 | ␉␉␉␉␉␉gMKextName);␊ |
| 645 | ␉␉␉␉useKernelCache = false;␊ |
| 646 | ␉␉␉␉break;␊ |
| 647 | ␉␉␉}␊ |
| 648 | ␉␉␉if (gBootFileType != kBlockDeviceType)␊ |
| 649 | ␉␉␉␉useKernelCache = false;␊ |
| 650 | ␊ |
| 651 | ␉␉} while(0);␊ |
| 652 | ␊ |
| 653 | ␉␉do {␊ |
| 654 | ␉␉␉if (useKernelCache) {␊ |
| 655 | ␉␉␉␉ret = LoadKernelCache(kernelCacheFile, &binary);␊ |
| 656 | ␉␉␉␉if (ret >= 0)␊ |
| 657 | ␉␉␉␉␉break;␊ |
| 658 | ␉␉␉}␊ |
| 659 | ␊ |
| 660 | ␉␉␉bool bootFileWithDevice = false;␊ |
| 661 | ␉␉␉// Check if bootFile start with a device ex: bt(0,0)/Extra/mach_kernel␊ |
| 662 | ␉␉␉if (strncmp(bootInfo->bootFile,"bt(",3) == 0 ||␊ |
| 663 | ␉␉␉␉strncmp(bootInfo->bootFile,"hd(",3) == 0 ||␊ |
| 664 | ␉␉␉␉strncmp(bootInfo->bootFile,"rd(",3) == 0)␊ |
| 665 | ␉␉␉␉bootFileWithDevice = true;␊ |
| 666 | ␊ |
| 667 | ␉␉␉// bootFile must start with a / if it not start with a device name␊ |
| 668 | ␉␉␉if (!bootFileWithDevice && (bootInfo->bootFile)[0] != '/')␊ |
| 669 | ␉␉␉␉snprintf(bootFile, sizeof(bootFile), "/%s", bootInfo->bootFile); // append a leading /␊ |
| 670 | ␉␉␉else␊ |
| 671 | ␉␉␉␉strlcpy(bootFile, bootInfo->bootFile, sizeof(bootFile));␊ |
| 672 | ␊ |
| 673 | ␉␉␉// Try to load kernel image from alternate locations on boot helper partitions.␊ |
| 674 | ␉␉␉ret = -1;␊ |
| 675 | ␉␉␉if ((gBootVolume->flags & kBVFlagBooter) && !bootFileWithDevice) {␊ |
| 676 | ␉␉␉␉snprintf(bootFilePath, sizeof(bootFilePath), "com.apple.boot.P%s", bootFile);␊ |
| 677 | ␉␉␉␉ret = GetFileInfo(NULL, bootFilePath, &flags, &time);␊ |
| 678 | ␉␉␉␉if (ret == -1)␊ |
| 679 | ␉␉␉␉{␊ |
| 680 | ␉␉␉␉␉snprintf(bootFilePath, sizeof(bootFilePath), "com.apple.boot.R%s", bootFile);␊ |
| 681 | ␉␉␉␉␉ret = GetFileInfo(NULL, bootFilePath, &flags, &time);␊ |
| 682 | ␉␉␉␉␉if (ret == -1)␊ |
| 683 | ␉␉␉␉␉{␊ |
| 684 | ␉␉␉␉␉␉snprintf(bootFilePath, sizeof(bootFilePath), "com.apple.boot.S%s", bootFile);␊ |
| 685 | ␉␉␉␉␉␉ret = GetFileInfo(NULL, bootFilePath, &flags, &time);␊ |
| 686 | ␉␉␉␉␉}␊ |
| 687 | ␉␉␉␉}␊ |
| 688 | ␉␉␉}␊ |
| 689 | ␉␉␉if (ret == -1) {␊ |
| 690 | ␉␉␉␉// No alternate location found, using the original kernel image path.␊ |
| 691 | ␉␉␉␉strlcpy(bootFilePath, bootFile, sizeof(bootFilePath));␊ |
| 692 | ␉␉␉}␊ |
| 693 | ␊ |
| 694 | ␉␉␉DBG("Loading kernel: '%s'\n", bootFilePath);␊ |
| 695 | ␉␉␉ret = LoadThinFatFile(bootFilePath, &binary);␊ |
| 696 | ␉␉␉if (ret <= 0 && archCpuType == CPU_TYPE_X86_64)␊ |
| 697 | ␉␉␉{␊ |
| 698 | ␉␉␉␉archCpuType = CPU_TYPE_I386;␊ |
| 699 | ␉␉␉␉ret = LoadThinFatFile(bootFilePath, &binary);␊ |
| 700 | ␉␉␉}␊ |
| 701 | ␉␉} while (0);␊ |
| 702 | ␊ |
| 703 | ␉␉clearActivityIndicator();␊ |
| 704 | ␊ |
| 705 | #if DEBUG␊ |
| 706 | ␉␉printf("Pausing...");␊ |
| 707 | ␉␉sleep(8);␊ |
| 708 | #endif␊ |
| 709 | ␊ |
| 710 | ␉␉if (ret <= 0) {␊ |
| 711 | ␉␉␉printf("Can't find %s\n", bootFile);␊ |
| 712 | ␉␉␉sleep(1);␊ |
| 713 | ␊ |
| 714 | ␉␉␉if (gBootFileType == kNetworkDeviceType) {␊ |
| 715 | ␉␉␉␉// Return control back to PXE. Don't unload PXE base code.␊ |
| 716 | ␉␉␉␉gUnloadPXEOnExit = false;␊ |
| 717 | ␉␉␉␉break;␊ |
| 718 | ␉␉␉}␊ |
| 719 | ␉␉␉pause();␊ |
| 720 | ␊ |
| 721 | ␉␉} else {␊ |
| 722 | ␉␉␉/* Won't return if successful. */␊ |
| 723 | ␉␉␉ret = ExecKernel(binary);␊ |
| 724 | ␉␉}␊ |
| 725 | ␉}␊ |
| 726 | ␊ |
| 727 | ␉// chainboot␊ |
| 728 | ␉if (status == 1) {␊ |
| 729 | ␉␉// if we are already in graphics-mode,␊ |
| 730 | ␉␉if (getVideoMode() == GRAPHICS_MODE) {␊ |
| 731 | ␉␉␉setVideoMode(VGA_TEXT_MODE, 0); // switch back to text mode.␊ |
| 732 | ␉␉}␊ |
| 733 | ␉}␊ |
| 734 | ␊ |
| 735 | ␉if ((gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit) {␊ |
| 736 | ␉␉nbpUnloadBaseCode();␊ |
| 737 | ␉}␊ |
| 738 | }␊ |
| 739 | ␊ |
| 740 | /*!␊ |
| 741 | ␉Selects a new BIOS device, taking care to update the global state appropriately.␊ |
| 742 | */␊ |
| 743 | /*␊ |
| 744 | static void selectBiosDevice(void)␊ |
| 745 | {␊ |
| 746 | ␉struct DiskBVMap *oldMap = diskResetBootVolumes(gBIOSDev);␊ |
| 747 | ␉CacheReset();␊ |
| 748 | ␉diskFreeMap(oldMap);␊ |
| 749 | ␉oldMap = NULL;␊ |
| 750 | ␊ |
| 751 | ␉int dev = selectAlternateBootDevice(gBIOSDev);␊ |
| 752 | ␊ |
| 753 | ␉BVRef bvchain = scanBootVolumes(dev, 0);␊ |
| 754 | ␉BVRef bootVol = selectBootVolume(bvchain);␊ |
| 755 | ␉gBootVolume = bootVol;␊ |
| 756 | ␉setRootVolume(bootVol);␊ |
| 757 | ␉gBIOSDev = dev;␊ |
| 758 | }␊ |
| 759 | */␊ |
| 760 | ␊ |
| 761 | bool checkOSVersion(const char * version) ␊ |
| 762 | {␊ |
| 763 | ␉return ((gMacOSVersion[0] == version[0]) && (gMacOSVersion[1] == version[1])␊ |
| 764 | ␉␉␉&& (gMacOSVersion[2] == version[2]) && (gMacOSVersion[3] == version[3]));␊ |
| 765 | }␊ |
| 766 | ␊ |
| 767 | static void getOSVersion()␊ |
| 768 | {␊ |
| 769 | ␉strncpy(gMacOSVersion, gBootVolume->OSVersion, sizeof(gMacOSVersion));␊ |
| 770 | }␊ |
| 771 | ␊ |
| 772 | #define BASE 65521L /* largest prime smaller than 65536 */␊ |
| 773 | #define NMAX 5000␊ |
| 774 | // NMAX (was 5521) the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1␊ |
| 775 | ␊ |
| 776 | #define DO1(buf, i)␉{s1 += buf[i]; s2 += s1;}␊ |
| 777 | #define DO2(buf, i)␉DO1(buf, i); DO1(buf, i + 1);␊ |
| 778 | #define DO4(buf, i)␉DO2(buf, i); DO2(buf, i + 2);␊ |
| 779 | #define DO8(buf, i)␉DO4(buf, i); DO4(buf, i + 4);␊ |
| 780 | #define DO16(buf)␉DO8(buf, 0); DO8(buf, 8);␊ |
| 781 | ␊ |
| 782 | unsigned long Adler32(unsigned char *buf, long len)␊ |
| 783 | {␊ |
| 784 | ␉unsigned long s1 = 1; // adler & 0xffff;␊ |
| 785 | ␉unsigned long s2 = 0; // (adler >> 16) & 0xffff;␊ |
| 786 | ␉unsigned long result;␊ |
| 787 | ␉int k;␊ |
| 788 | ␊ |
| 789 | ␉while (len > 0) {␊ |
| 790 | ␉␉k = len < NMAX ? len : NMAX;␊ |
| 791 | ␉␉len -= k;␊ |
| 792 | ␉␉while (k >= 16) {␊ |
| 793 | ␉␉␉DO16(buf);␊ |
| 794 | ␉␉␉buf += 16;␊ |
| 795 | ␉␉␉k -= 16;␊ |
| 796 | ␉␉}␊ |
| 797 | ␉␉if (k != 0) do {␊ |
| 798 | ␉␉␉s1 += *buf++;␊ |
| 799 | ␉␉␉s2 += s1;␊ |
| 800 | ␉␉} while (--k);␊ |
| 801 | ␉␉s1 %= BASE;␊ |
| 802 | ␉␉s2 %= BASE;␊ |
| 803 | ␉}␊ |
| 804 | ␉result = (s2 << 16) | s1;␊ |
| 805 | ␉return OSSwapHostToBigInt32(result);␊ |
| 806 | }␊ |
| 807 | |
