void boot(int biosdev)
{
int status;
char *bootFile;
unsigned long adler32;
BOOL quiet;
BOOL firstRun = YES;
BVRef bvChain;
zeroBSS();
// Initialize malloc
malloc_init(0, 0, 0, malloc_error);
// Enable A20 gate before accessing memory above 1Mb.
enableA20();
// Set reminder to unload the PXE base code. Neglect to unload
// the base code will result in a hang or kernel panic.
gUnloadPXEOnExit = 1;
// Record the device that the booter was loaded from.
gBIOSDev = biosdev & kBIOSDevMask;
// Initialize boot info structure.
initKernBootStruct( gBIOSDev );
// Setup VGA text mode.
// Not sure if it is safe to call setVideoMode() before the
// config table has been loaded. Call video_mode() instead.
video_mode( 2 ); // 80x25 mono text mode.
// Scan hardware configuration.
scanHardware();
// First get info for boot volume.
bvChain = scanBootVolumes(gBIOSDev, 0);
// Record default boot device.
gBootVolume = selectBootVolume(bvChain);
bootArgs->kernDev = MAKEKERNDEV(gBIOSDev,
BIOS_DEV_UNIT(gBootVolume),
gBootVolume->part_no );
// Load default config file from boot device.
status = loadSystemConfig(0, 0);
if ( getBoolForKey( kQuietBootKey, &quiet ) && quiet ) {
gBootMode |= kBootModeQuiet;
}
// Parse args, load and start kernel.
while (1)
{
const char *val;
int len;
int trycache;
long flags, cachetime, kerneltime, exttime;
int ret = -1;
// Initialize globals.
sysConfigValid = 0;
gErrors = 0;
status = getBootOptions(firstRun);
firstRun = NO;
if (status == -1) continue;
status = processBootOptions();
if ( status == 1 ) break;
if ( status == -1 ) continue;
// Found and loaded a config file. Proceed with boot.
// Reset cache name.
bzero(gCacheNameAdler, sizeof(gCacheNameAdler));
if ( getValueForKey( kRootDeviceKey, &val, &len ) == YES ) {
if (*val == '*') {
val++;
len--;
}
strncpy( gCacheNameAdler + 64, val, len );
sprintf(gCacheNameAdler + 64 + len, ",%s", bootArgs->bootFile);
} else {
strcpy(gCacheNameAdler + 64, bootArgs->bootFile);
}
adler32 = Adler32(gCacheNameAdler, sizeof(gCacheNameAdler));
if (getValueForKey(kKernelCacheKey, &val, &len) == YES) {
strlcpy(gBootKernelCacheFile, val, len+1);
} else {
sprintf(gBootKernelCacheFile, "%s.%08lX", kDefaultCachePath, adler32);
}
// Check for cache file.
trycache = (((gBootMode & kBootModeSafe) == 0) &&
(gOverrideKernel == NO) &&
(gBootFileType == kBlockDeviceType) &&
(gMKextName[0] == '\0') &&
(gBootKernelCacheFile[0] != '\0'));
printf("Loading Darwin/x86\n");
if (trycache) do {
// if we haven't found the kernel yet, don't use the cache
ret = GetFileInfo(NULL, bootArgs->bootFile, &flags, &kerneltime);
if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)) {
trycache = 0;
break;
}
ret = GetFileInfo(NULL, gBootKernelCacheFile, &flags, &cachetime);
if ((ret != 0) || ((flags & kFileTypeMask) != kFileTypeFlat)
|| (cachetime < kerneltime)) {
trycache = 0;
break;
}
ret = GetFileInfo("/System/Library/", "Extensions", &flags, &exttime);
if ((ret == 0) && ((flags & kFileTypeMask) == kFileTypeDirectory)
&& (cachetime < exttime)) {
trycache = 0;
break;
}
if (kerneltime > exttime) {
exttime = kerneltime;
}
if (cachetime != (exttime + 1)) {
trycache = 0;
break;
}
} while (0);
do {
if (trycache) {
bootFile = gBootKernelCacheFile;
verbose("Loading kernel cache %s\n", bootFile);
ret = LoadFile(bootFile);
if (ret >= 0) {
break;
}
}
bootFile = bootArgs->bootFile;
verbose("Loading kernel %s\n", bootFile);
ret = LoadFile(bootFile);
} while (0);
clearActivityIndicator();
#if DEBUG
printf("Pausing...");
sleep(8);
#endif
if (ret < 0) {
error("Can't find %s\n", bootFile);
if ( gBootFileType == kBIOSDevTypeFloppy )
{
// floppy in drive, but failed to load kernel.
gBIOSDev = kBIOSDevTypeHardDrive;
initKernBootStruct( gBIOSDev );
printf("Attempting to load from hard drive...");
}
else if ( gBootFileType == kNetworkDeviceType )
{
// Return control back to PXE. Don't unload PXE base code.
gUnloadPXEOnExit = 0;
break;
}
} else {
/* Won't return if successful. */
ret = ExecKernel((void *)kLoadAddr);
}
} /* while(1) */
if ((gBootFileType == kNetworkDeviceType) && gUnloadPXEOnExit) {
nbpUnloadBaseCode();
}
}
//==========================================================================
//Initializes the runtime. Right now this means zeroing the BSS and initializing malloc.
//
void initialize_runtime(void)
{
zeroBSS();
malloc_init(0, 0, 0, malloc_error);
}
void boot(int biosdev)
{
zeroBSS();
mallocInit(0, 0, 0, mallocError);
#if MUST_ENABLE_A20
// Enable A20 gate before accessing memory above 1 MB.
if (fastEnableA20() != 0)
{
enableA20(); // Fast enable failed. Try legacy method.
}
#endif
bool haveCABootPlist = false;
bool quietBootMode = true;
void *fileLoadBuffer = (void *)kLoadAddr;
char bootFile[256];
char rootUUID[37];
char * kernelFlags = NULL;
const char * val;
int length = 0;
int kernelFlagsLength = 0;
bootFile[0] = '\0';
rootUUID[0] = '\0';
#if PRE_LINKED_KERNEL_SUPPORT
bool mayUseKernelCache = false;
long flags, cachetime;
#endif
initPlatform(biosdev); // Passing on the boot drive.
#if DEBUG_STATE_ENABLED
// Don't switch graphics mode / show boot logo when DEBUG is set to 1.
printf("\ngArchCPUType (CPU): %s\n", (gArchCPUType == CPU_TYPE_X86_64) ? "x86_64" : "i386");
sleep(3); // Silent sleep.
#else
showBootLogo();
#endif
// A bit ugly maybe, but this will be changed sometime soon.
while (readKeyboardStatus())
{
int key = (bgetc() & 0xff);
if ((key |= 0x20) == 'r')
{
gPlatform.BootRecoveryHD = true;
}
}
initPartitionChain();
#define loadCABootPlist() loadSystemConfig(&bootInfo->bootConfig)
// Loading: /Library/Preferences/SystemConfiguration/com.apple.Boot.plist
// TODO: Check if everything works <i>without</i> having this plist.
if (loadCABootPlist() == STATE_SUCCESS)
{
_BOOT_DEBUG_DUMP("com.apple.Boot.plist located.\n");
// Load successful. Change state accordantly.
haveCABootPlist = true; // Checked <i>before</i> calling key functions.
// Check the value of <key>Kernel Flags</key> for stuff we are interested in.
// Note: We need to know about: arch= and the boot flags: -s, -v, -f and -x
if (getValueForKey(kKernelFlagsKey, &val, &kernelFlagsLength, &bootInfo->bootConfig))
{
// "Kernel Flags" key found. Check length to see if we have anything to work with.
if (kernelFlagsLength)
{
kernelFlagsLength++;
// Yes. Allocate memory for it and copy the kernel flags into it.
kernelFlags = malloc(kernelFlagsLength);
strlcpy(kernelFlags, val, kernelFlagsLength);
// Is 'arch=<i386/x86_64>' specified as kernel flag?
if (getValueForBootKey(kernelFlags, "arch", &val, &length)) // && len >= 4)
{
gArchCPUType = (strncmp(val, "x86_64", 6) == 0) ? CPU_TYPE_X86_64 : CPU_TYPE_I386;
_BOOT_DEBUG_DUMP("gArchCPUType (c.a.B.plist): %s\n", (gArchCPUType == CPU_TYPE_X86_64) ? "x86_64" : "i386");
}
// Check for -v (verbose) and -s (single user mode) flags.
gVerboseMode = getValueForBootKey(kernelFlags, kVerboseModeFlag, &val, &length) ||
getValueForBootKey(kernelFlags, kSingleUserModeFlag, &val, &length);
if (gVerboseMode)
{
#if DEBUG_BOOT == false
setVideoMode(VGA_TEXT_MODE);
#endif
}
// Check for -x (safe) and -f (flush cache) flags.
if (getValueForBootKey(kernelFlags, kSafeModeFlag, &val, &length) ||
getValueForBootKey(kernelFlags, kIgnoreCachesFlag, &val, &length))
{
gBootMode = kBootModeSafe;
}
// Is 'boot-uuid=<value>' specified as kernel flag?
if (getValueForBootKey(kernelFlags, kBootUUIDKey, &val, &length) && length == 36)
{
_BOOT_DEBUG_DUMP("Target boot-uuid=<%s>\n", val);
// Yes. Copy its value into rootUUID.
strlcpy(rootUUID, val, 37);
}
/* else
{
strlcpy(rootUUID, "3453E0E5-017B-38AD-A0AA-D0BBD8565D6", 37);
_BOOT_DEBUG_DUMP("Target boot-uuid=<%s>\n", rootUUID);
} */
}
}
#if PRE_LINKED_KERNEL_SUPPORT
/* Look for 'Kernel Cache' key. */
if (getValueForKey(kKernelCacheKey, &val, &length, &bootInfo->bootConfig))
{
_BOOT_DEBUG_DUMP("Kernel Cache set to: %s\n", val);
// Key found. Check if the given filepath/name exists.
if (length && GetFileInfo(NULL, val, &flags, &cachetime) == 0)
{
// File located. Init kernelCacheFile so that we can use it as boot file.
gPlatform.KernelCachePath = strdup(val);
// Set flag to inform the load process to skip parts of the code.
gPlatform.KernelCacheSpecified = true;
_BOOT_DEBUG_DUMP("kernelcache file found.\n");
}
_BOOT_DEBUG_ELSE_DUMP("Error: kernelcache file not found.\n");
}
// _BOOT_DEBUG_ELSE_DUMP("No 'Kernel Cache' key given.\n");
#endif
/* Enable touching of a single BIOS device by setting 'Scan Single Drive' to yes.
if (getBoolForKey(kScanSingleDriveKey, &gScanSingleDrive, &bootInfo->bootConfig) && gScanSingleDrive)
{
gScanSingleDrive = true;
} */
}
else
{
_BOOT_DEBUG_DUMP("No com.apple.Boot.plist found.\n");
}
// Was a target drive (per UUID) specified in com.apple.Boot.plist?
if (rootUUID[0] == '\0')
{
_BOOT_DEBUG_DUMP("No UUID specified in com.apple.Boot.plist\n");
// No, so are we booting from a System Volume?
if (gPlatform.BootVolume->flags & kBVFlagSystemVolume)
{
_BOOT_DEBUG_DUMP("Booting from a System Volume, getting UUID.\n");
// Yes, then let's get the UUID.
if (HFSGetUUID(gPlatform.BootVolume, rootUUID) == STATE_SUCCESS)
{
_BOOT_DEBUG_DUMP("Success [%s]\n", rootUUID);
}
}
else // Booting from USB-stick or SDboot media.
{
_BOOT_DEBUG_DUMP("Booting from a Non System Volume, getting UUID.\n");
// Get target System Volume and UUID in one go.
BVRef rootVolume = getTargetRootVolume(rootUUID);
if (rootVolume)
{
_BOOT_DEBUG_DUMP("Success [%s]\n", rootUUID);
gPlatform.RootVolume = rootVolume;
}
}
// This should never happen, but just to be sure.
if (rootUUID[0] == '\0')
{
_BOOT_DEBUG_DUMP("Failed to get UUID for System Volume.\n");
if (!gVerboseMode)
{
// Force verbose mode when we didn't find a UUID, so
// that people see what is going on in times of trouble.
gVerboseMode = true;
}
}
}
/*
* At this stage we know exactly what boot mode we're in, and which disk to boot from
* any of which may or may not have been set/changed (in com.apple.Boot.plist) into a
* non-default system setting and thus is this the place to update our EFI tree.
*/
updateEFITree(rootUUID);
if (haveCABootPlist) // Check boolean before doing more time consuming tasks.
{
if (getBoolForKey(kQuietBootKey, &quietBootMode, &bootInfo->bootConfig) && !quietBootMode)
{
gBootMode = kBootModeNormal; // Reversed from: gBootMode |= kBootModeQuiet;
}
}
// Parse args, load and start kernel.
while (1)
{
// Initialize globals.
sysConfigValid = 0;
gErrors = 0;
int retStatus = -1;
getAndProcessBootArguments(kernelFlags);
// Initialize bootFile (defaults to: mach_kernel).
strcpy(bootFile, bootInfo->bootFile);
#if PRE_LINKED_KERNEL_SUPPORT
_BOOT_DEBUG_DUMP("gBootMode = %d\n", gBootMode);
// Preliminary checks to prevent us from doing useless things.
mayUseKernelCache = ((gBootMode & kBootModeSafe) == 0);
_BOOT_DEBUG_DUMP("mayUseKernelCache = %s\n", mayUseKernelCache ? "true" : "false");
/*
* A pre-linked kernel, or kernelcache, requires you to have all essential kexts for your
* configuration, including FakeSMC.kext in: /System/Library/Extensions/
* Not in /Extra/Extensions/ because this directory will be ignored, completely when a
* pre-linked kernel or kernelcache is used!
*
* Note: Not following this word of advise will render your system incapable of booting!
*/
if (mayUseKernelCache == false)
{
_BOOT_DEBUG_DUMP("Warning: kernelcache will be ignored!\n");
// True when 'Kernel Cache' is set in com.apple.Boot.plist
if (gPlatform.KernelCacheSpecified == true)
{
sprintf(bootFile, "%s", bootInfo->bootFile);
}
}
else
{
// True when 'Kernel Cache' is set in com.apple.Boot.plist
if (gPlatform.KernelCacheSpecified == true)
{
_BOOT_DEBUG_DUMP("kernelcache: %s\n", gPlatform.KernelCachePath);
/*
* Starting with Lion, we can take a shortcut by simply pointing
* the 'bootFile' to the kernel cache and we are done.
*/
sprintf(bootFile, "%s", gPlatform.KernelCachePath);
}
/*
* We might have been fired up from a USB thumbdrive (kickstart boot) and
* thus we have to check the kernel cache path first (might not be there).
*/
else if (GetFileInfo(NULL, gPlatform.KernelCachePath, &flags, &cachetime) == 0)
{
#if ((MAKE_TARGET_OS & LION) == LION) // Also for Mountain Lion, which has bit 2 set like Lion.
_BOOT_DEBUG_DUMP("Checking for kernelcache...\n");
if (GetFileInfo(gPlatform.KernelCachePath, (char *)kKernelCache, &flags, &cachetime) == 0)
{
sprintf(bootFile, "%s/%s", gPlatform.KernelCachePath, kKernelCache);
_BOOT_DEBUG_DUMP("Kernelcache located.\n");
}
_BOOT_DEBUG_ELSE_DUMP("Failed to locate the kernelcache. Will load: %s!\n", bootInfo->bootFile);
}
_BOOT_DEBUG_ELSE_DUMP("Failed to locate the kernelcache (directory)!\n");
}
#else // Not for (Mountain) Lion, go easy with the Snow Leopard.
static char preLinkedKernelPath[128];
static char adler32Key[PLATFORM_NAME_LEN + ROOT_PATH_LEN];
unsigned long adler32 = 0;
preLinkedKernelPath[0] = '\0';
_BOOT_DEBUG_DUMP("Checking for pre-linked kernel...\n");
// Zero out platform info (name and kernel root path).
bzero(adler32Key, sizeof(adler32Key));
// Construct key for the pre-linked kernel checksum (generated by adler32).
sprintf(adler32Key, gPlatform.ModelID);
sprintf(adler32Key + PLATFORM_NAME_LEN, "%s", BOOT_DEVICE_PATH);
sprintf(adler32Key + (PLATFORM_NAME_LEN + 38), "%s", bootInfo->bootFile);
adler32 = Adler32((unsigned char *)adler32Key, sizeof(adler32Key));
_BOOT_DEBUG_DUMP("adler32: %08X\n", adler32);
// Create path to pre-linked kernel.
sprintf(preLinkedKernelPath, "%s/%s_%s.%08lX", gPlatform.KernelCachePath, kKernelCache,
((gArchCPUType == CPU_TYPE_X86_64) ? "x86_64" : "i386"), adler32);
// Check if this file exists.
if ((GetFileInfo(NULL, preLinkedKernelPath, &flags, &cachetime) == 0) && ((flags & kFileTypeMask) == kFileTypeFlat))
{
_BOOT_DEBUG_DUMP("Pre-linked kernel cache located!\nLoading pre-linked kernel: %s\n", preLinkedKernelPath);
// Returns -1 on error, or the actual filesize.
if (LoadFile((const char *)preLinkedKernelPath))
{
retStatus = 1;
fileLoadBuffer = (void *)kLoadAddr;
bootFile[0] = 0;
}
_BOOT_DEBUG_ELSE_DUMP("Failed to load the pre-linked kernel. Will load: %s!\n", bootInfo->bootFile);
}
_BOOT_DEBUG_ELSE_DUMP("Failed to locate the pre-linked kernel!\n");
}
_BOOT_DEBUG_ELSE_DUMP("Failed to locate the cache directory!\n");
}