/
IOKitBSDInit.cpp
1048 lines (891 loc) · 28.3 KB
/
IOKitBSDInit.cpp
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/*
* Copyright (c) 1998-2011 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. The rights granted to you under the License
* may not be used to create, or enable the creation or redistribution of,
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
#include <IOKit/IOBSD.h>
#include <IOKit/IOLib.h>
#include <IOKit/IOService.h>
#include <IOKit/IOCatalogue.h>
#include <IOKit/IODeviceTreeSupport.h>
#include <IOKit/IOKitKeys.h>
#include <IOKit/IOPlatformExpert.h>
#include <IOKit/IOUserClient.h>
extern "C" {
#include <pexpert/pexpert.h>
#include <kern/clock.h>
#include <mach/machine.h>
#include <uuid/uuid.h>
#include <sys/vnode_internal.h>
#include <sys/mount.h>
// how long to wait for matching root device, secs
#if DEBUG
#define ROOTDEVICETIMEOUT 120
#else
#define ROOTDEVICETIMEOUT 60
#endif
extern dev_t mdevadd(int devid, uint64_t base, unsigned int size, int phys);
extern dev_t mdevlookup(int devid);
extern void mdevremoveall(void);
extern int mdevgetrange(int devid, uint64_t *base, uint64_t *size);
extern void di_root_ramfile(IORegistryEntry * entry);
#define ROUNDUP(a, b) (((a) + ((b) - 1)) & (~((b) - 1)))
#define IOPOLLED_COREFILE (CONFIG_KDP_INTERACTIVE_DEBUGGING)
#if defined(XNU_TARGET_OS_BRIDGE)
#define kIOCoreDumpPath "/private/var/internal/kernelcore"
#else
#define kIOCoreDumpPath "/private/var/vm/kernelcore"
#endif
#if CONFIG_KDP_INTERACTIVE_DEBUGGING
/*
* Touched by IOFindBSDRoot() if a RAMDisk is used for the root device.
*/
extern uint64_t kdp_core_ramdisk_addr;
extern uint64_t kdp_core_ramdisk_size;
#endif
#if IOPOLLED_COREFILE
static void IOOpenPolledCoreFile(thread_call_param_t __unused, thread_call_param_t corefilename);
thread_call_t corefile_open_call = NULL;
#endif
kern_return_t
IOKitBSDInit( void )
{
IOService::publishResource("IOBSD");
#if IOPOLLED_COREFILE
corefile_open_call = thread_call_allocate_with_options(IOOpenPolledCoreFile, NULL, THREAD_CALL_PRIORITY_KERNEL, THREAD_CALL_OPTIONS_ONCE);
#endif
return kIOReturnSuccess;
}
void
IOServicePublishResource( const char * property, boolean_t value )
{
if (value) {
IOService::publishResource( property, kOSBooleanTrue );
} else {
IOService::getResourceService()->removeProperty( property );
}
}
boolean_t
IOServiceWaitForMatchingResource( const char * property, uint64_t timeout )
{
OSDictionary * dict = NULL;
IOService * match = NULL;
boolean_t found = false;
do {
dict = IOService::resourceMatching( property );
if (!dict) {
continue;
}
match = IOService::waitForMatchingService( dict, timeout );
if (match) {
found = true;
}
} while (false);
if (dict) {
dict->release();
}
if (match) {
match->release();
}
return found;
}
boolean_t
IOCatalogueMatchingDriversPresent( const char * property )
{
OSDictionary * dict = NULL;
OSOrderedSet * set = NULL;
SInt32 generationCount = 0;
boolean_t found = false;
do {
dict = OSDictionary::withCapacity(1);
if (!dict) {
continue;
}
dict->setObject( property, kOSBooleanTrue );
set = gIOCatalogue->findDrivers( dict, &generationCount );
if (set && (set->getCount() > 0)) {
found = true;
}
} while (false);
if (dict) {
dict->release();
}
if (set) {
set->release();
}
return found;
}
OSDictionary *
IOBSDNameMatching( const char * name )
{
OSDictionary * dict;
const OSSymbol * str = NULL;
do {
dict = IOService::serviceMatching( gIOServiceKey );
if (!dict) {
continue;
}
str = OSSymbol::withCString( name );
if (!str) {
continue;
}
dict->setObject( kIOBSDNameKey, (OSObject *) str );
str->release();
return dict;
} while (false);
if (dict) {
dict->release();
}
if (str) {
str->release();
}
return NULL;
}
OSDictionary *
IOUUIDMatching( void )
{
return IOService::resourceMatching( "boot-uuid-media" );
}
OSDictionary *
IONetworkNamePrefixMatching( const char * prefix )
{
OSDictionary * matching;
OSDictionary * propDict = NULL;
const OSSymbol * str = NULL;
char networkType[128];
do {
matching = IOService::serviceMatching( "IONetworkInterface" );
if (matching == NULL) {
continue;
}
propDict = OSDictionary::withCapacity(1);
if (propDict == NULL) {
continue;
}
str = OSSymbol::withCString( prefix );
if (str == NULL) {
continue;
}
propDict->setObject( "IOInterfaceNamePrefix", (OSObject *) str );
str->release();
str = NULL;
// see if we're contrained to netroot off of specific network type
if (PE_parse_boot_argn( "network-type", networkType, 128 )) {
str = OSSymbol::withCString( networkType );
if (str) {
propDict->setObject( "IONetworkRootType", str);
str->release();
str = NULL;
}
}
if (matching->setObject( gIOPropertyMatchKey,
(OSObject *) propDict ) != true) {
continue;
}
propDict->release();
propDict = NULL;
return matching;
} while (false);
if (matching) {
matching->release();
}
if (propDict) {
propDict->release();
}
if (str) {
str->release();
}
return NULL;
}
static bool
IORegisterNetworkInterface( IOService * netif )
{
// A network interface is typically named and registered
// with BSD after receiving a request from a user space
// "namer". However, for cases when the system needs to
// root from the network, this registration task must be
// done inside the kernel and completed before the root
// device is handed to BSD.
IOService * stack;
OSNumber * zero = NULL;
OSString * path = NULL;
OSDictionary * dict = NULL;
char * pathBuf = NULL;
int len;
enum { kMaxPathLen = 512 };
do {
stack = IOService::waitForService(
IOService::serviceMatching("IONetworkStack"));
if (stack == NULL) {
break;
}
dict = OSDictionary::withCapacity(3);
if (dict == NULL) {
break;
}
zero = OSNumber::withNumber((UInt64) 0, 32);
if (zero == NULL) {
break;
}
pathBuf = (char *) IOMalloc( kMaxPathLen );
if (pathBuf == NULL) {
break;
}
len = kMaxPathLen;
if (netif->getPath( pathBuf, &len, gIOServicePlane )
== false) {
break;
}
path = OSString::withCStringNoCopy( pathBuf );
if (path == NULL) {
break;
}
dict->setObject( "IOInterfaceUnit", zero );
dict->setObject( kIOPathMatchKey, path );
stack->setProperties( dict );
}while (false);
if (zero) {
zero->release();
}
if (path) {
path->release();
}
if (dict) {
dict->release();
}
if (pathBuf) {
IOFree(pathBuf, kMaxPathLen);
}
return netif->getProperty( kIOBSDNameKey ) != NULL;
}
OSDictionary *
IOOFPathMatching( const char * path, char * buf, int maxLen )
{
OSDictionary * matching = NULL;
OSString * str;
char * comp;
int len;
do {
len = strlen( kIODeviceTreePlane ":" );
maxLen -= len;
if (maxLen <= 0) {
continue;
}
strlcpy( buf, kIODeviceTreePlane ":", len + 1 );
comp = buf + len;
len = strlen( path );
maxLen -= len;
if (maxLen <= 0) {
continue;
}
strlcpy( comp, path, len + 1 );
matching = OSDictionary::withCapacity( 1 );
if (!matching) {
continue;
}
str = OSString::withCString( buf );
if (!str) {
continue;
}
matching->setObject( kIOPathMatchKey, str );
str->release();
return matching;
} while (false);
if (matching) {
matching->release();
}
return NULL;
}
static int didRam = 0;
enum { kMaxPathBuf = 512, kMaxBootVar = 128 };
kern_return_t
IOFindBSDRoot( char * rootName, unsigned int rootNameSize,
dev_t * root, u_int32_t * oflags )
{
mach_timespec_t t;
IOService * service;
IORegistryEntry * regEntry;
OSDictionary * matching = NULL;
OSString * iostr;
OSNumber * off;
OSData * data = NULL;
UInt32 flags = 0;
int mnr, mjr;
const char * mediaProperty = NULL;
char * rdBootVar;
char * str;
const char * look = NULL;
int len;
bool debugInfoPrintedOnce = false;
bool needNetworkKexts = false;
const char * uuidStr = NULL;
static int mountAttempts = 0;
int xchar, dchar;
// stall here for anyone matching on the IOBSD resource to finish (filesystems)
matching = IOService::serviceMatching(gIOResourcesKey);
assert(matching);
matching->setObject(gIOResourceMatchedKey, gIOBSDKey);
if ((service = IOService::waitForMatchingService(matching, 30ULL * kSecondScale))) {
service->release();
} else {
IOLog("!BSD\n");
}
matching->release();
matching = NULL;
if (mountAttempts++) {
IOLog("mount(%d) failed\n", mountAttempts);
IOSleep( 5 * 1000 );
}
str = (char *) IOMalloc( kMaxPathBuf + kMaxBootVar );
if (!str) {
return kIOReturnNoMemory;
}
rdBootVar = str + kMaxPathBuf;
if (!PE_parse_boot_argn("rd", rdBootVar, kMaxBootVar )
&& !PE_parse_boot_argn("rootdev", rdBootVar, kMaxBootVar )) {
rdBootVar[0] = 0;
}
do {
if ((regEntry = IORegistryEntry::fromPath( "/chosen", gIODTPlane ))) {
di_root_ramfile(regEntry);
data = OSDynamicCast(OSData, regEntry->getProperty( "root-matching" ));
if (data) {
matching = OSDynamicCast(OSDictionary, OSUnserializeXML((char *)data->getBytesNoCopy()));
if (matching) {
continue;
}
}
data = (OSData *) regEntry->getProperty( "boot-uuid" );
if (data) {
uuidStr = (const char*)data->getBytesNoCopy();
OSString *uuidString = OSString::withCString( uuidStr );
// match the boot-args boot-uuid processing below
if (uuidString) {
IOLog("rooting via boot-uuid from /chosen: %s\n", uuidStr);
IOService::publishResource( "boot-uuid", uuidString );
uuidString->release();
matching = IOUUIDMatching();
mediaProperty = "boot-uuid-media";
regEntry->release();
continue;
} else {
uuidStr = NULL;
}
}
regEntry->release();
}
} while (false);
//
// See if we have a RAMDisk property in /chosen/memory-map. If so, make it into a device.
// It will become /dev/mdx, where x is 0-f.
//
if (!didRam) { /* Have we already build this ram disk? */
didRam = 1; /* Remember we did this */
if ((regEntry = IORegistryEntry::fromPath( "/chosen/memory-map", gIODTPlane ))) { /* Find the map node */
data = (OSData *)regEntry->getProperty("RAMDisk"); /* Find the ram disk, if there */
if (data) { /* We found one */
uintptr_t *ramdParms;
ramdParms = (uintptr_t *)data->getBytesNoCopy(); /* Point to the ram disk base and size */
(void)mdevadd(-1, ml_static_ptovirt(ramdParms[0]) >> 12, ramdParms[1] >> 12, 0); /* Initialize it and pass back the device number */
}
regEntry->release(); /* Toss the entry */
}
}
//
// Now check if we are trying to root on a memory device
//
if ((rdBootVar[0] == 'm') && (rdBootVar[1] == 'd') && (rdBootVar[3] == 0)) {
dchar = xchar = rdBootVar[2]; /* Get the actual device */
if ((xchar >= '0') && (xchar <= '9')) {
xchar = xchar - '0'; /* If digit, convert */
} else {
xchar = xchar & ~' '; /* Fold to upper case */
if ((xchar >= 'A') && (xchar <= 'F')) { /* Is this a valid digit? */
xchar = (xchar & 0xF) + 9; /* Convert the hex digit */
dchar = dchar | ' '; /* Fold to lower case */
} else {
xchar = -1; /* Show bogus */
}
}
if (xchar >= 0) { /* Do we have a valid memory device name? */
*root = mdevlookup(xchar); /* Find the device number */
if (*root >= 0) { /* Did we find one? */
rootName[0] = 'm'; /* Build root name */
rootName[1] = 'd'; /* Build root name */
rootName[2] = dchar; /* Build root name */
rootName[3] = 0; /* Build root name */
IOLog("BSD root: %s, major %d, minor %d\n", rootName, major(*root), minor(*root));
*oflags = 0; /* Show that this is not network */
#if CONFIG_KDP_INTERACTIVE_DEBUGGING
/* retrieve final ramdisk range and initialize KDP variables */
if (mdevgetrange(xchar, &kdp_core_ramdisk_addr, &kdp_core_ramdisk_size) != 0) {
IOLog("Unable to retrieve range for root memory device %d\n", xchar);
kdp_core_ramdisk_addr = 0;
kdp_core_ramdisk_size = 0;
}
#endif
goto iofrootx; /* Join common exit... */
}
panic("IOFindBSDRoot: specified root memory device, %s, has not been configured\n", rdBootVar); /* Not there */
}
}
if ((!matching) && rdBootVar[0]) {
// by BSD name
look = rdBootVar;
if (look[0] == '*') {
look++;
}
if (strncmp( look, "en", strlen( "en" )) == 0) {
matching = IONetworkNamePrefixMatching( "en" );
needNetworkKexts = true;
} else if (strncmp( look, "uuid", strlen( "uuid" )) == 0) {
char *uuid;
OSString *uuidString;
uuid = (char *)IOMalloc( kMaxBootVar );
if (uuid) {
if (!PE_parse_boot_argn( "boot-uuid", uuid, kMaxBootVar )) {
panic( "rd=uuid but no boot-uuid=<value> specified" );
}
uuidString = OSString::withCString( uuid );
if (uuidString) {
IOService::publishResource( "boot-uuid", uuidString );
uuidString->release();
IOLog( "\nWaiting for boot volume with UUID %s\n", uuid );
matching = IOUUIDMatching();
mediaProperty = "boot-uuid-media";
}
IOFree( uuid, kMaxBootVar );
}
} else {
matching = IOBSDNameMatching( look );
}
}
if (!matching) {
OSString * astring;
// Match any HFS media
matching = IOService::serviceMatching( "IOMedia" );
astring = OSString::withCStringNoCopy("Apple_HFS");
if (astring) {
matching->setObject("Content", astring);
astring->release();
}
}
if (gIOKitDebug & kIOWaitQuietBeforeRoot) {
IOLog( "Waiting for matching to complete\n" );
IOService::getPlatform()->waitQuiet();
}
if (true && matching) {
OSSerialize * s = OSSerialize::withCapacity( 5 );
if (matching->serialize( s )) {
IOLog( "Waiting on %s\n", s->text());
s->release();
}
}
char namep[8];
if (needNetworkKexts
|| PE_parse_boot_argn("-s", namep, sizeof(namep))) {
IOService::startDeferredMatches();
}
do {
t.tv_sec = ROOTDEVICETIMEOUT;
t.tv_nsec = 0;
matching->retain();
service = IOService::waitForService( matching, &t );
if ((!service) || (mountAttempts == 10)) {
PE_display_icon( 0, "noroot");
IOLog( "Still waiting for root device\n" );
if (!debugInfoPrintedOnce) {
debugInfoPrintedOnce = true;
if (gIOKitDebug & kIOLogDTree) {
IOLog("\nDT plane:\n");
IOPrintPlane( gIODTPlane );
}
if (gIOKitDebug & kIOLogServiceTree) {
IOLog("\nService plane:\n");
IOPrintPlane( gIOServicePlane );
}
if (gIOKitDebug & kIOLogMemory) {
IOPrintMemory();
}
}
}
} while (!service);
matching->release();
if (service && mediaProperty) {
service = (IOService *)service->getProperty(mediaProperty);
}
mjr = 0;
mnr = 0;
// If the IOService we matched to is a subclass of IONetworkInterface,
// then make sure it has been registered with BSD and has a BSD name
// assigned.
if (service
&& service->metaCast( "IONetworkInterface" )
&& !IORegisterNetworkInterface( service )) {
service = NULL;
}
if (service) {
len = kMaxPathBuf;
service->getPath( str, &len, gIOServicePlane );
IOLog( "Got boot device = %s\n", str );
iostr = (OSString *) service->getProperty( kIOBSDNameKey );
if (iostr) {
strlcpy( rootName, iostr->getCStringNoCopy(), rootNameSize );
}
off = (OSNumber *) service->getProperty( kIOBSDMajorKey );
if (off) {
mjr = off->unsigned32BitValue();
}
off = (OSNumber *) service->getProperty( kIOBSDMinorKey );
if (off) {
mnr = off->unsigned32BitValue();
}
if (service->metaCast( "IONetworkInterface" )) {
flags |= 1;
}
} else {
IOLog( "Wait for root failed\n" );
strlcpy( rootName, "en0", rootNameSize );
flags |= 1;
}
IOLog( "BSD root: %s", rootName );
if (mjr) {
IOLog(", major %d, minor %d\n", mjr, mnr );
} else {
IOLog("\n");
}
*root = makedev( mjr, mnr );
*oflags = flags;
IOFree( str, kMaxPathBuf + kMaxBootVar );
iofrootx:
if ((gIOKitDebug & (kIOLogDTree | kIOLogServiceTree | kIOLogMemory)) && !debugInfoPrintedOnce) {
IOService::getPlatform()->waitQuiet();
if (gIOKitDebug & kIOLogDTree) {
IOLog("\nDT plane:\n");
IOPrintPlane( gIODTPlane );
}
if (gIOKitDebug & kIOLogServiceTree) {
IOLog("\nService plane:\n");
IOPrintPlane( gIOServicePlane );
}
if (gIOKitDebug & kIOLogMemory) {
IOPrintMemory();
}
}
return kIOReturnSuccess;
}
bool
IORamDiskBSDRoot(void)
{
char rdBootVar[kMaxBootVar];
if (PE_parse_boot_argn("rd", rdBootVar, kMaxBootVar )
|| PE_parse_boot_argn("rootdev", rdBootVar, kMaxBootVar )) {
if ((rdBootVar[0] == 'm') && (rdBootVar[1] == 'd') && (rdBootVar[3] == 0)) {
return true;
}
}
return false;
}
void
IOSecureBSDRoot(const char * rootName)
{
#if CONFIG_EMBEDDED
IOReturn result;
IOPlatformExpert *pe;
OSDictionary *matching;
const OSSymbol *functionName = OSSymbol::withCStringNoCopy("SecureRootName");
matching = IOService::serviceMatching("IOPlatformExpert");
assert(matching);
pe = (IOPlatformExpert *) IOService::waitForMatchingService(matching, 30ULL * kSecondScale);
matching->release();
assert(pe);
// Returns kIOReturnNotPrivileged is the root device is not secure.
// Returns kIOReturnUnsupported if "SecureRootName" is not implemented.
result = pe->callPlatformFunction(functionName, false, (void *)rootName, (void *)NULL, (void *)NULL, (void *)NULL);
functionName->release();
OSSafeReleaseNULL(pe);
if (result == kIOReturnNotPrivileged) {
mdevremoveall();
}
#endif // CONFIG_EMBEDDED
}
void *
IOBSDRegistryEntryForDeviceTree(char * path)
{
return IORegistryEntry::fromPath(path, gIODTPlane);
}
void
IOBSDRegistryEntryRelease(void * entry)
{
IORegistryEntry * regEntry = (IORegistryEntry *)entry;
if (regEntry) {
regEntry->release();
}
return;
}
const void *
IOBSDRegistryEntryGetData(void * entry, char * property_name,
int * packet_length)
{
OSData * data;
IORegistryEntry * regEntry = (IORegistryEntry *)entry;
data = (OSData *) regEntry->getProperty(property_name);
if (data) {
*packet_length = data->getLength();
return data->getBytesNoCopy();
}
return NULL;
}
kern_return_t
IOBSDGetPlatformUUID( uuid_t uuid, mach_timespec_t timeout )
{
IOService * resources;
OSString * string;
resources = IOService::waitForService( IOService::resourceMatching( kIOPlatformUUIDKey ), (timeout.tv_sec || timeout.tv_nsec) ? &timeout : NULL );
if (resources == NULL) {
return KERN_OPERATION_TIMED_OUT;
}
string = (OSString *) IOService::getPlatform()->getProvider()->getProperty( kIOPlatformUUIDKey );
if (string == NULL) {
return KERN_NOT_SUPPORTED;
}
uuid_parse( string->getCStringNoCopy(), uuid );
return KERN_SUCCESS;
}
} /* extern "C" */
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#include <sys/conf.h>
#include <sys/vnode.h>
#include <sys/vnode_internal.h>
#include <sys/fcntl.h>
#include <IOKit/IOPolledInterface.h>
#include <IOKit/IOBufferMemoryDescriptor.h>
IOPolledFileIOVars * gIOPolledCoreFileVars;
kern_return_t gIOPolledCoreFileOpenRet = kIOReturnNotReady;
IOPolledCoreFileMode_t gIOPolledCoreFileMode = kIOPolledCoreFileModeNotInitialized;
#if IOPOLLED_COREFILE
#if defined(XNU_TARGET_OS_BRIDGE)
// On bridgeOS allocate a 150MB corefile and leave 150MB free
#define kIOCoreDumpSize 150ULL*1024ULL*1024ULL
#define kIOCoreDumpFreeSize 150ULL*1024ULL*1024ULL
#elif CONFIG_EMBEDDED /* defined(XNU_TARGET_OS_BRIDGE) */
// On embedded devices with >3GB DRAM we allocate a 500MB corefile
// otherwise allocate a 350MB corefile. Leave 350 MB free
#define kIOCoreDumpMinSize 350ULL*1024ULL*1024ULL
#define kIOCoreDumpLargeSize 500ULL*1024ULL*1024ULL
#define kIOCoreDumpFreeSize 350ULL*1024ULL*1024ULL
#else /* defined(XNU_TARGET_OS_BRIDGE) */
// on macOS devices allocate a corefile sized at 1GB / 32GB of DRAM,
// fallback to a 1GB corefile and leave at least 1GB free
#define kIOCoreDumpMinSize 1024ULL*1024ULL*1024ULL
#define kIOCoreDumpIncrementalSize 1024ULL*1024ULL*1024ULL
#define kIOCoreDumpFreeSize 1024ULL*1024ULL*1024ULL
// on older macOS devices we allocate a 1MB file at boot
// to store a panic time stackshot
#define kIOStackshotFileSize 1024ULL*1024ULL
#endif /* defined(XNU_TARGET_OS_BRIDGE) */
static IOPolledCoreFileMode_t
GetCoreFileMode()
{
if (on_device_corefile_enabled()) {
return kIOPolledCoreFileModeCoredump;
} else if (panic_stackshot_to_disk_enabled()) {
return kIOPolledCoreFileModeStackshot;
} else {
return kIOPolledCoreFileModeDisabled;
}
}
static void
IOCoreFileGetSize(uint64_t *ideal_size, uint64_t *fallback_size, uint64_t *free_space_to_leave, IOPolledCoreFileMode_t mode)
{
unsigned int requested_corefile_size = 0;
*ideal_size = *fallback_size = *free_space_to_leave = 0;
#if defined(XNU_TARGET_OS_BRIDGE)
#pragma unused(mode)
*ideal_size = *fallback_size = kIOCoreDumpSize;
*free_space_to_leave = kIOCoreDumpFreeSize;
#elif CONFIG_EMBEDDED /* defined(XNU_TARGET_OS_BRIDGE) */
#pragma unused(mode)
*ideal_size = *fallback_size = kIOCoreDumpMinSize;
if (max_mem > (3 * 1024ULL * 1024ULL * 1024ULL)) {
*ideal_size = kIOCoreDumpLargeSize;
}
*free_space_to_leave = kIOCoreDumpFreeSize;
#else /* defined(XNU_TARGET_OS_BRIDGE) */
if (mode == kIOPolledCoreFileModeCoredump) {
*ideal_size = *fallback_size = kIOCoreDumpMinSize;
if (kIOCoreDumpIncrementalSize != 0 && max_mem > (32 * 1024ULL * 1024ULL * 1024ULL)) {
*ideal_size = ((ROUNDUP(max_mem, (32 * 1024ULL * 1024ULL * 1024ULL)) / (32 * 1024ULL * 1024ULL * 1024ULL)) * kIOCoreDumpIncrementalSize);
}
*free_space_to_leave = kIOCoreDumpFreeSize;
} else if (mode == kIOPolledCoreFileModeStackshot) {
*ideal_size = *fallback_size = *free_space_to_leave = kIOStackshotFileSize;
}
#endif /* defined(XNU_TARGET_OS_BRIDGE) */
// If a custom size was requested, override the ideal and requested sizes
if (PE_parse_boot_argn("corefile_size_mb", &requested_corefile_size, sizeof(requested_corefile_size))) {
IOLog("Boot-args specify %d MB kernel corefile\n", requested_corefile_size);
*ideal_size = *fallback_size = (requested_corefile_size * 1024ULL * 1024ULL);
}
return;
}
static void
IOOpenPolledCoreFile(thread_call_param_t __unused, thread_call_param_t corefilename)
{
assert(corefilename != NULL);
IOReturn err;
char *filename = (char *) corefilename;
uint64_t corefile_size_bytes = 0, corefile_fallback_size_bytes = 0, free_space_to_leave_bytes = 0;
IOPolledCoreFileMode_t mode_to_init = GetCoreFileMode();
if (gIOPolledCoreFileVars) {
return;
}
if (!IOPolledInterface::gMetaClass.getInstanceCount()) {
return;
}
if (mode_to_init == kIOPolledCoreFileModeDisabled) {
gIOPolledCoreFileMode = kIOPolledCoreFileModeDisabled;
return;
}
// We'll overwrite this once we open the file, we update this to mark that we have made
// it past initialization
gIOPolledCoreFileMode = kIOPolledCoreFileModeClosed;
IOCoreFileGetSize(&corefile_size_bytes, &corefile_fallback_size_bytes, &free_space_to_leave_bytes, mode_to_init);
do {
err = IOPolledFileOpen(filename, kIOPolledFileCreate, corefile_size_bytes, free_space_to_leave_bytes,
NULL, 0, &gIOPolledCoreFileVars, NULL, NULL, NULL);
if (kIOReturnSuccess == err) {
break;
} else if (kIOReturnNoSpace == err) {
IOLog("Failed to open corefile of size %llu MB (low disk space)",
(corefile_size_bytes / (1024ULL * 1024ULL)));
if (corefile_size_bytes == corefile_fallback_size_bytes) {
gIOPolledCoreFileOpenRet = err;
return;
}
} else {
IOLog("Failed to open corefile of size %llu MB (returned error 0x%x)\n",
(corefile_size_bytes / (1024ULL * 1024ULL)), err);
gIOPolledCoreFileOpenRet = err;
return;
}
err = IOPolledFileOpen(filename, kIOPolledFileCreate, corefile_fallback_size_bytes, free_space_to_leave_bytes,
NULL, 0, &gIOPolledCoreFileVars, NULL, NULL, NULL);
if (kIOReturnSuccess != err) {
IOLog("Failed to open corefile of size %llu MB (returned error 0x%x)\n",
(corefile_fallback_size_bytes / (1024ULL * 1024ULL)), err);
gIOPolledCoreFileOpenRet = err;
return;
}
} while (false);
gIOPolledCoreFileOpenRet = IOPolledFilePollersSetup(gIOPolledCoreFileVars, kIOPolledPreflightCoreDumpState);
if (kIOReturnSuccess != gIOPolledCoreFileOpenRet) {
IOPolledFileClose(&gIOPolledCoreFileVars, 0, NULL, 0, 0, 0);
IOLog("IOPolledFilePollersSetup for corefile failed with error: 0x%x\n", err);
} else {
IOLog("Opened corefile of size %llu MB\n", (corefile_size_bytes / (1024ULL * 1024ULL)));
gIOPolledCoreFileMode = mode_to_init;
}
return;
}
static void
IOClosePolledCoreFile(void)
{
gIOPolledCoreFileOpenRet = kIOReturnNotOpen;
gIOPolledCoreFileMode = kIOPolledCoreFileModeClosed;
IOPolledFilePollersClose(gIOPolledCoreFileVars, kIOPolledPostflightCoreDumpState);
IOPolledFileClose(&gIOPolledCoreFileVars, 0, NULL, 0, 0, 0);
}
#endif /* IOPOLLED_COREFILE */
extern "C" void
IOBSDMountChange(struct mount * mp, uint32_t op)
{
#if IOPOLLED_COREFILE
uint64_t flags;
char path[128];
int pathLen;
vnode_t vn;
int result;
switch (op) {
case kIOMountChangeMount:
case kIOMountChangeDidResize:
if (gIOPolledCoreFileVars) {
break;
}
flags = vfs_flags(mp);
if (MNT_RDONLY & flags) {
break;
}
if (!(MNT_LOCAL & flags)) {
break;
}
vn = vfs_vnodecovered(mp);
if (!vn) {
break;
}