int
processBootOptions()
{
const char * cp = gBootArgs;
const char * val = 0;
const char * kernel;
int cnt;
int userCnt;
int cntRemaining;
char * argP;
char uuidStr[64];
BOOL uuidSet = NO;
char * configKernelFlags;
char * valueBuffer;
valueBuffer = (char *)malloc(VALUE_SIZE);
skipblanks( &cp );
// Update the unit and partition number.
if ( gBootVolume )
{
if ( gBootVolume->flags & kBVFlagForeignBoot )
{
readBootSector( gBootVolume->biosdev, gBootVolume->part_boff,
(void *) 0x7c00 );
//
// Setup edx, and signal intention to chain load the
// foreign booter.
//
chainbootdev = gBootVolume->biosdev;
chainbootflag = 1;
return 1;
}
bootInfo->kernDev &= ~((B_UNITMASK << B_UNITSHIFT ) |
(B_PARTITIONMASK << B_PARTITIONSHIFT));
bootInfo->kernDev |= MAKEKERNDEV( 0,
/* unit */ BIOS_DEV_UNIT(gBootVolume),
/* partition */ gBootVolume->part_no );
}
// Load config table specified by the user, or use the default.
if (getValueForBootKey( cp, "config", &val, &cnt ) == FALSE) {
val = 0;
cnt = 0;
}
loadSystemConfig(val, cnt);
if ( !sysConfigValid ) return -1;
// Use the kernel name specified by the user, or fetch the name
// in the config table, or use the default if not specified.
// Specifying a kernel name on the command line, or specifying
// a non-default kernel name in the config file counts as
// overriding the kernel, which causes the kernelcache not
// to be used.
gOverrideKernel = NO;
if (( kernel = extractKernelName((char **)&cp) )) {
strcpy( bootInfo->bootFile, kernel );
gOverrideKernel = YES;
} else {
if ( getValueForKey( kKernelNameKey, &val, &cnt ) ) {
strlcpy( bootInfo->bootFile, val, cnt+1 );
if (strcmp( bootInfo->bootFile, kDefaultKernel ) != 0) {
gOverrideKernel = YES;
}
} else {
strcpy( bootInfo->bootFile, kDefaultKernel );
}
}
cntRemaining = BOOT_STRING_LEN - 2; // save 1 for NULL, 1 for space
argP = bootArgs->CommandLine;
// Get config table kernel flags, if not ignored.
if (getValueForBootKey(cp, kIgnoreBootFileFlag, &val, &cnt) == TRUE ||
getValueForKey( kKernelFlagsKey, &val, &cnt ) == FALSE) {
val = "";
cnt = 0;
}
configKernelFlags = (char *)malloc(cnt + 1);
strlcpy(configKernelFlags, val, cnt + 1);
if (processBootArgument(kBootUUIDKey, cp, configKernelFlags, bootInfo->config, &argP, &cntRemaining, 0)) {
// boot-uuid was set either on the command-line
// or in the config file.
uuidSet = YES;
} else {
if (GetFSUUID(bootInfo->bootFile, uuidStr) == 0) {
verbose("Setting boot-uuid to: %s\n", uuidStr);
copyArgument(kBootUUIDKey, uuidStr, strlen(uuidStr), &argP, &cntRemaining);
uuidSet = YES;
}
}
if (!processBootArgument(kRootDeviceKey, cp, configKernelFlags, bootInfo->config, &argP, &cntRemaining, gRootDevice)) {
cnt = 0;
if ( getValueForKey( kBootDeviceKey, &val, &cnt)) {
valueBuffer[0] = '*';
cnt++;
strlcpy(valueBuffer + 1, val, cnt);
val = valueBuffer;
} else {
if (uuidSet) {
val = "*uuid";
cnt = 5;
} else {
// Don't set "rd=.." if there is no boot device key
// and no UUID.
val = "";
cnt = 0;
}
}
if (cnt > 0) {
copyArgument( kRootDeviceKey, val, cnt, &argP, &cntRemaining);
}
strlcpy( gRootDevice, val, (cnt + 1));
}
if (!processBootArgument(kPlatformKey, cp, configKernelFlags, bootInfo->config, &argP, &cntRemaining, gPlatformName)) {
getPlatformName(gPlatformName);
copyArgument(kPlatformKey, gPlatformName, strlen(gPlatformName), &argP, &cntRemaining);
}
if (!getValueForBootKey(cp, kSafeModeFlag, &val, &cnt) &&
!getValueForBootKey(configKernelFlags, kSafeModeFlag, &val, &cnt)) {
if (gBootMode & kBootModeSafe) {
copyArgument(0, kSafeModeFlag, strlen(kSafeModeFlag), &argP, &cntRemaining);
}
}
// Store the merged kernel flags and boot args.
cnt = strlen(configKernelFlags);
if (cnt) {
if (cnt > cntRemaining) {
error("Warning: boot arguments too long, truncating\n");
cnt = cntRemaining;
}
strncpy(argP, configKernelFlags, cnt);
argP[cnt++] = ' ';
cntRemaining -= cnt;
}
userCnt = strlen(cp);
if (userCnt > cntRemaining) {
error("Warning: boot arguments too long, truncating\n");
userCnt = cntRemaining;
}
strncpy(&argP[cnt], cp, userCnt);
argP[cnt+userCnt] = '\0';
gVerboseMode = getValueForKey( kVerboseModeFlag, &val, &cnt ) ||
getValueForKey( kSingleUserModeFlag, &val, &cnt );
gBootMode = ( getValueForKey( kSafeModeFlag, &val, &cnt ) ) ?
kBootModeSafe : kBootModeNormal;
if ( getValueForKey( kOldSafeModeFlag, &val, &cnt ) ) {
gBootMode = kBootModeSafe;
}
if ( getValueForKey( kMKextCacheKey, &val, &cnt ) ) {
strlcpy(gMKextName, val, cnt + 1);
}
free(configKernelFlags);
free(valueBuffer);
return 0;
}
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();
}
}
int processBootOptions()
{
const char * cp = gBootArgs;
const char * val = 0;
const char * kernel;
int cnt;
int userCnt;
int cntRemaining;
char * argP;
skipblanks( &cp );
// Update the unit and partition number.
if ( gBootVolume )
{
if ( gBootVolume->flags & kBVFlagForeignBoot )
{
readBootSector( gBootVolume->biosdev, gBootVolume->part_boff,
(void *) 0x7c00 );
//
// Setup edx, and signal intention to chain load the
// foreign booter.
//
chainbootdev = gBootVolume->biosdev;
chainbootflag = 1;
return 1;
}
bootArgs->kernDev &= ~((B_UNITMASK << B_UNITSHIFT ) |
(B_PARTITIONMASK << B_PARTITIONSHIFT));
bootArgs->kernDev |= MAKEKERNDEV( 0,
/* unit */ BIOS_DEV_UNIT(gBootVolume),
/* partition */ gBootVolume->part_no );
}
// Load config table specified by the user, or use the default.
if (getValueForBootKey( cp, "config", &val, &cnt ) == FALSE) {
val = 0;
cnt = 0;
}
loadSystemConfig(val, cnt);
if ( !sysConfigValid ) return -1;
// Use the kernel name specified by the user, or fetch the name
// in the config table, or use the default if not specified.
// Specifying a kernel name on the command line, or specifying
// a non-default kernel name in the config file counts as
// overriding the kernel, which causes the kernelcache not
// to be used.
gOverrideKernel = NO;
if (( kernel = extractKernelName((char **)&cp) )) {
strcpy( bootArgs->bootFile, kernel );
gOverrideKernel = YES;
} else {
if ( getValueForKey( kKernelNameKey, &val, &cnt ) ) {
strlcpy( bootArgs->bootFile, val, cnt+1 );
if (strcmp( bootArgs->bootFile, kDefaultKernel ) != 0) {
gOverrideKernel = YES;
}
} else {
strcpy( bootArgs->bootFile, kDefaultKernel );
}
}
cntRemaining = BOOT_STRING_LEN - 2; // save 1 for NULL, 1 for space
// Check to see if we need to specify root device.
// If user types "rd=.." on the boot line, it overrides
// the boot device key in the boot arguments file.
//
argP = bootArgs->bootString;
if ( getValueForBootKey( cp, kRootDeviceKey, &val, &cnt ) == FALSE &&
getValueForKey( kRootDeviceKey, &val, &cnt ) == FALSE ) {
if ( getValueForKey( kBootDeviceKey, &val, &cnt ) ) {
strcpy( argP, "rd=*" );
argP += 4;
strlcpy( argP, val, cnt+1);
cntRemaining -= cnt;
argP += cnt;
*argP++ = ' ';
}
}
// Check to see if we should ignore saved kernel flags.
if (getValueForBootKey(cp, kIgnoreBootFileFlag, &val, &cnt) == FALSE) {
if (getValueForKey( kKernelFlagsKey, &val, &cnt ) == FALSE) {
val = 0;
cnt = 0;
}
}
// Store the merged kernel flags and boot args.
if (cnt > cntRemaining) {
error("Warning: boot arguments too long, truncated\n");
cnt = cntRemaining;
}
if (cnt) {
strncpy(argP, val, cnt);
argP[cnt++] = ' ';
}
cntRemaining = cntRemaining - cnt;
userCnt = strlen(cp);
if (userCnt > cntRemaining) {
error("Warning: boot arguments too long, truncated\n");
userCnt = cntRemaining;
}
strncpy(&argP[cnt], cp, userCnt);
argP[cnt+userCnt] = '\0';
gVerboseMode = getValueForKey( kVerboseModeFlag, &val, &cnt ) ||
getValueForKey( kSingleUserModeFlag, &val, &cnt );
gBootMode = ( getValueForKey( kSafeModeFlag, &val, &cnt ) ) ?
kBootModeSafe : kBootModeNormal;
if ( getValueForKey( kPlatformKey, &val, &cnt ) ) {
strlcpy(gPlatformName, val, cnt + 1);
} else {
strcpy(gPlatformName, "ACPI");
}
if ( getValueForKey( kMKextCacheKey, &val, &cnt ) ) {
strlcpy(gMKextName, val, cnt + 1);
}
return 0;
}
